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WO2020175077A1 - Boil-off gas treatment system and ship - Google Patents

Boil-off gas treatment system and ship Download PDF

Info

Publication number
WO2020175077A1
WO2020175077A1 PCT/JP2020/004619 JP2020004619W WO2020175077A1 WO 2020175077 A1 WO2020175077 A1 WO 2020175077A1 JP 2020004619 W JP2020004619 W JP 2020004619W WO 2020175077 A1 WO2020175077 A1 WO 2020175077A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
boil
unit
boiler
separated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/004619
Other languages
French (fr)
Japanese (ja)
Inventor
龍太 中村
英司 齋藤
貴澄 寺原
浩市 松下
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Marine Machinery and Equipment Co Ltd
Original Assignee
Mitsubishi Heavy Industries Marine Machinery and Equipment Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Marine Machinery and Equipment Co Ltd filed Critical Mitsubishi Heavy Industries Marine Machinery and Equipment Co Ltd
Priority to CN202080016333.7A priority Critical patent/CN113474250B/en
Priority to KR1020217026821A priority patent/KR102633885B1/en
Priority to SG11202109217XA priority patent/SG11202109217XA/en
Publication of WO2020175077A1 publication Critical patent/WO2020175077A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/0035—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by gas expansion with extraction of work
    • F25J1/0037—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by gas expansion with extraction of work of a return stream
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0209—Hydrocarbon fuels, e.g. methane or acetylene
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F17C9/04—Recovery of thermal energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022—Hydrocarbons, e.g. natural gas
    • F25J1/0025—Boil-off gases "BOG" from storages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/004—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by flash gas recovery
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0201—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using only internal refrigeration means, i.e. without external refrigeration
    • F25J1/0202—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using only internal refrigeration means, i.e. without external refrigeration in a quasi-closed internal refrigeration loop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
    • F25J1/0229—Integration with a unit for using hydrocarbons, e.g. consuming hydrocarbons as feed stock
    • F25J1/023—Integration with a unit for using hydrocarbons, e.g. consuming hydrocarbons as feed stock for the combustion as fuels, i.e. integration with the fuel gas system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
    • F25J1/0275—Construction and layout of liquefaction equipments, e.g. valves, machines adapted for special use of the liquefaction unit, e.g. portable or transportable devices
    • F25J1/0277—Offshore use, e.g. during shipping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
    • F25J1/0285—Combination of different types of drivers mechanically coupled to the same refrigerant compressor, possibly split on multiple compressor casings
    • F25J1/0288—Combination of different types of drivers mechanically coupled to the same refrigerant compressor, possibly split on multiple compressor casings using work extraction by mechanical coupling of compression and expansion of the refrigerant, so-called companders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J99/00—Subject matter not provided for in other groups of this subclass
    • B63J2099/001—Burning of transported goods, e.g. fuel, boil-off or refuse
    • B63J2099/003—Burning of transported goods, e.g. fuel, boil-off or refuse of cargo oil or fuel, or of boil-off gases, e.g. for propulsive purposes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/035—Propane butane, e.g. LPG, GPL
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/033—Small pressure, e.g. for liquefied gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0447—Composition; Humidity
    • F17C2250/0452—Concentration of a product
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0447—Composition; Humidity
    • F17C2250/0456—Calorific or heating value
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/06—Controlling or regulating of parameters as output values
    • F17C2250/0605—Parameters
    • F17C2250/0642—Composition; Humidity
    • F17C2250/0652—Calorific or heating value
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/04—Reducing risks and environmental impact
    • F17C2260/046—Enhancing energy recovery
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • F17C2265/031—Treating the boil-off by discharge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • F17C2265/032—Treating the boil-off by recovery
    • F17C2265/033—Treating the boil-off by recovery with cooling
    • F17C2265/034—Treating the boil-off by recovery with cooling with condensing the gas phase
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • F17C2265/032—Treating the boil-off by recovery
    • F17C2265/037—Treating the boil-off by recovery with pressurising
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/06—Fluid distribution
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/06—Fluid distribution
    • F17C2265/066—Fluid distribution for feeding engines for propulsion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0105—Ships
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/50—Measures to reduce greenhouse gas emissions related to the propulsion system
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/50—Measures to reduce greenhouse gas emissions related to the propulsion system
    • Y02T70/5218—Less carbon-intensive fuels, e.g. natural gas, biofuels

Definitions

  • the present invention relates to a boil-off gas treatment system and a ship.
  • Patent Document 1 describes a device in which BOG generated from an L NG tank is compressed by a BOG compressor and then cooled by a heat exchanger to be reliquefied.
  • the BOG is cooled to the saturated state in the liquefaction part of the heat exchanger, and the non-condensed component is separated from the saturated liquid by the gas-liquid separation drum provided on the downstream side. Then, the nitrogen rich gas thus obtained is appropriately extracted and treated in the boiler.
  • Patent Document 2 describes a device that re-liquefies B0G generated from an LNG storage tank by a reliquefaction device and separates it into liquefied methane and a mixed gas by a nitrogen separator.
  • the mixed gas containing nitrogen gas is discharged out of the system and burned in the boiler tank only when the nitrogen gas content is out of the standard range.
  • Patent Document 1 Patent No. 3908881
  • Patent Document 2 Japanese Unexamined Patent Publication No. 20000—3 3 8 0 9 3
  • Patent Document 1 and Patent Document 2 do not consider the use of the separated vapor phase boil-off gas in the internal combustion engine for the main engine.
  • the gas-phase boil-off gas separated by the separator when used in the main engine internal combustion engine, the entire amount of the separated gas-phase boil-off gas is supplied to the main engine internal combustion engine. ..
  • the separated gas-phase boil-off gas may not be suitably combusted in the main engine internal combustion engine.
  • the present invention has been made in view of the above circumstances, and it is possible to supply a gas phase boil-off gas separated from a reliquefied gas-liquid mixed boil-off gas to a desired device.
  • An object of the present invention is to provide a boil-off gas treatment system and a ship that can be suitably burned.
  • the boil-off gas treatment system and the ship of the present invention employ the following means.
  • a boil-off gas processing system is capable of burning boil-off gas generated in a tank in which liquefied gas is stored, and a boiler that generates steam, and boil-off gas generated in the tank.
  • a liquefaction device that performs liquefaction treatment, a separation unit that separates the gas-liquid mixed boil-off gas that has been liquefied by the reliquefaction device into a gas phase and a liquid phase, and a separation unit that separates
  • a first pipe that guides the gas-phase boil-off gas to an internal combustion engine for a main engine that can burn the boil-off gas; a second pipe that guides the gas-phase boil-off gas separated by the separation unit to the boiler; and the separation.
  • a gas phase boil-off gas separated in the section is introduced into the internal combustion engine for the main engine or into the boiler.
  • the gas-phase boil-off gas separated by the separation unit (hereinafter, referred to as "separated gas") is connected to the internal combustion engine for the main engine, and the second pipe is connected to the boiler. Equipped with.
  • the separated gas can be introduced to both the internal combustion engine for the main engine and the boiler. Therefore, the separated gas can be burnt and used as fuel in the internal combustion engine for the main engine and/or the boiler. Therefore, the energy efficiency of the entire system can be improved as compared with the case where the separated gas is not used.
  • a switching unit is provided for switching whether to guide the separated gas to the internal combustion engine for the main engine or to the boiler.
  • the separated gas can be guided to a desired one of the internal combustion engine for the main engine and the boiler. Therefore, for example, the separated gas can be guided to the supply destination according to the operating conditions of the internal combustion engine for the main engine and the boiler, the components of the separated gas, and the like. Therefore, the separated gas can be suitably burned in the internal combustion engine for the main engine and the boiler.
  • the boil-off gas treatment system is a nitrogen content measuring unit that measures a nitrogen content of a gas-phase boil-off gas separated by the separating unit, and the nitrogen content measuring unit.
  • a determination unit that determines a supply destination of the gas-phase boil-off gas separated by the separation unit, and a gas-phase boil-off gas separated by the separation unit, based on the nitrogen content measured by the separation unit;
  • a switching control unit that controls the switching unit so that the switching unit is supplied to the supply destination determined by.
  • the nitrogen content of the separated gas is measured, and the supply destination is determined based on the measured nitrogen content.
  • the separation gas supply destination can be an appropriate supply destination from the viewpoint of the nitrogen content. Therefore, for example, when the separated gas is a gas that cannot be suitably combusted in the internal combustion engine for the main engine from the viewpoint of the nitrogen content, the separated gas is guided to the boiler to burn the separated gas.
  • the energy generated by the combustion process can be used to generate steam. Therefore, it is possible to improve energy efficiency as compared with a configuration in which the energy generated by the combustion process is not used.
  • the separated gas can be guided to the supply destination according to the nitrogen content.
  • combustion processing device for processing the separated gas.
  • combustion processing device a dedicated combustion device for processing the separated gas.
  • the separated gas which cannot be suitably combusted in the internal combustion engine for the main engine, is combusted in the boiler and the steam can be generated.
  • the combustion processing device can be omitted. Therefore, the structure can be simplified as compared with the case where the combustion processing device is provided.
  • the determination based on the nitrogen content performed by the determining unit may be performed depending on whether or not the nitrogen content exceeds a predetermined threshold value. That is, when the nitrogen content measured by the nitrogen content measurement unit exceeds a predetermined threshold, the determination unit determines the supply destination of the separation gas (gas phase boil-off gas separated by the separation unit) as a boiler. You may decide to With this configuration, the separation gas supply destination can be a more appropriate supply destination from the viewpoint of the nitrogen content. That is, when the separated gas has a high nitrogen content and cannot be suitably combusted in the main engine internal combustion engine, the separated gas can be prevented from being guided to the main engine internal combustion engine.
  • the predetermined threshold value is, for example, the upper limit value of the nitrogen content of the fuel that can be suitably combusted by the internal combustion engine for the main engine.
  • the boil-off gas treatment system includes a calorific value measurement unit that measures the calorific value of the vapor-phase boil-off gas separated by the separation unit, and a calorific value measured by the calorific value measurement unit. Based on the above, the determination unit that determines the supply destination of the vapor-phase boil-off gas separated by the separation unit and the vapor-phase boiler off-gas that is separated by the separation unit are supplied to the supply destination determined by the determination unit. And a switching control unit that controls the switching unit.
  • the heat quantity of the separated gas is measured, and the supply destination is determined based on the measured heat quantity. This ensures that the separation gas supply destination is appropriate from the viewpoint of heat quantity. ⁇ 02020/175077 5 ((171?2020/004619
  • the separated gas is a gas that cannot be suitably burned in the internal combustion engine for the main engine from the viewpoint of heat quantity
  • the energy produced by the combustion process can be used to generate steam. Therefore, it is possible to improve energy efficiency, as compared with a configuration in which the energy generated by the combustion process is not used.
  • the separated gas can be guided to the supply destination according to the amount of heat, and the energy efficiency can be improved.
  • the determining unit determines that the separation gas (gas phase boil-off gas separated by the separating unit) is supplied to the internal combustion engine for the main engine.
  • the supply destination of the separation gas can be a more appropriate supply destination from the viewpoint of the amount of heat. That is, when the separated gas has a large amount of heat and can be suitably combusted in the main engine internal combustion engine, the boil-off gas can be guided to the main engine internal combustion engine.
  • the predetermined threshold value is, for example, the lower limit value of the calorific value of the fuel with which the internal combustion engine for the main engine can suitably burn.
  • the boil-off gas treatment system is based on a pressure measuring unit that measures the pressure of the boiler, and a pressure measured by the pressure measuring unit when a flame is formed in the boiler. And a supply unit determined by the determination unit, which determines a supply destination of the gas-phase boil-off gas separated by the separation unit. ⁇ 02020/175077 6 ⁇ (: 171-12020/004619
  • a switching control unit that controls the switching unit so that boil-off gas is first supplied; and the determination unit, when the pressure measured by the pressure measurement unit is lower than a predetermined threshold,
  • the supply destination of the gas-phase boil-off gas separated by the separation unit may be set to the boiler.
  • the supply destination of the separated gas is determined to be the boiler.
  • the separated gas can be guided to the boiler when steam is not appropriately generated in the boiler. Therefore, the steam can be generated in the boiler in a stable manner.
  • a boil-off gas treatment system is a boil-off to a supply destination determined by the determination unit, and a determination unit that determines a supply destination of the gas-phase boil-off gas separated by the separation unit.
  • a switching control unit that controls the switching unit so that gas is supplied; and, when the flame is formed in the boiler, the determination unit supplies the gas-phase boil-off gas separated by the separation unit.
  • the destination may be the boiler.
  • the supply destination of the separated gas is set to the boiler.
  • the separated gas can be preferentially used as the fuel. Therefore, the amount of other fuel used for forming the flame can be reduced.
  • a ship according to an aspect of the present invention includes the boil-off gas treatment system according to any one of the above. Effect of the invention
  • the vaporized boil-off gas separated from the reliquefied boil-off gas in a gas-liquid mixed state can be suitably burned by introducing it to a desired device.
  • FIG. 1 is a configuration diagram showing an outline of a ship according to an embodiment of the present invention.
  • FIG. 2 is a block diagram showing a boil-off gas treatment system provided in the ship of FIG. 1. MODE FOR CARRYING OUT THE INVENTION
  • the boil-off gas treatment system 4 is applied to a ship 1 that carries LNG (Liquefed Natural Gas).
  • LNG Liiquefed Natural Gas
  • the target carried by the ship 1 is not limited to LNG, but may be another liquefied gas such as LPG (Liquefied Petroleum Gas).
  • the vessel 1 includes a main engine (internal combustion engine) 2, a tank 3 for storing LNG (liquefied gas), a boiler-off gas treatment system 4 for treating boil-off gas generated in the tank 3, and an on-board vessel. It is equipped with a power generation diesel engine 5 that generates the electricity to be used, and an economizer 6 that uses the heat of the exhaust gas discharged from the power generation diesel engine 5 to generate steam.
  • a power generation diesel engine 5 that generates the electricity to be used
  • economizer 6 that uses the heat of the exhaust gas discharged from the power generation diesel engine 5 to generate steam.
  • the main engine 2 is a two-stroke engine that can burn both fuel oil and fuel gas as fuel.
  • the engine 2 for the main engine drives a drive unit (not shown) by burning fuel oil (for example, heavy oil) or combustion gas (for example, LNG).
  • the drive unit rotationally drives a propulsion device (not shown) (for example, a screw) that gives a propulsive force to the ship 1 by the driving force from the main engine 2.
  • a plurality of tanks 3 (four in this embodiment, as an example) are provided.
  • Each tank 3 is made of aluminum, for example, and is configured so that LNG can be stored therein.
  • a discharge pipe 3a for discharging boil-off gas to the outside is provided above each tank 3.
  • the boil-off gas treatment system 4 includes a supply pipe 11 for supplying the boil-off gas discharged from the tank 3 to the engine 2 for the main engine, and a compression unit 12 for compressing the boil-off gas flowing through the supply pipe 1 1.
  • a re-liquefaction device 13 that liquefies boil-off gas, a gas-liquid separator (separation part) 14 that separates the liquefied boil-off gas in a gas-liquid mixed state into a vapor, and vapor is generated. It is equipped with a boiler 15 and. ⁇ 02020/175077 8 ⁇ (: 171?2020/004619
  • supply pipe 1 the boil-off gas which has flowed through the discharge pipe 3 3 provided in each tank 3, and supplied to the main machine engine 2. That is, the supply pipe 11 connects the tank 3 and the engine 2 for the main engine. As described above, the supply pipe 11 is provided with the compression unit 12 that compresses the boil-off gas flowing in the supply pipe 11.
  • a power generation engine supply pipe 16 is branched from the downstream side of the compression section 12.
  • the power generation engine supply pipe 16 supplies a part of the boil-off gas flowing through the supply pipe 11 to the power generation diesel engine 5.
  • the supply pipe 11 is branched from the circulation pipe 17 from the downstream side of the branch position of the power generation engine supply pipe 16.
  • the circulation pipe 1 7, is provided circulation pipe valve 1 7 3.
  • Circulation pipe valve 1 7 3 by adjusting the degree of opening, it is possible to adjust the flow rate of the BOG circulates in the circulation pipe 1 in 7.
  • the circulating pipe valve 1 7 3 can also be a fully closed state and the fully open state.
  • the boiler supply pipe 19 branches off from the upstream side of the compression section 12.
  • the boiler supply pipe 19 has a downstream end connected to a burner (not shown) provided in the boiler 15.
  • the boiler supply pipe 19 is configured to be able to supply a part of the boil-off gas flowing through the supply pipe 11 to the boiler 15 (more specifically, the planner).
  • the boiler supply pipe 19 is provided with a first valve 193.
  • the first valve 1 9 3 by adjusting the degree of opening, it is possible to adjust the flow rate of the BOG circulates the boiler supply pipe 1 9.
  • the first valve 1 9 3 can be fully closed and fully open state.
  • the compression unit 12 has a plurality of (five in this embodiment as an example) high-pressure compressors 1 2 3 that compress the boil-off gas flowing through the supply pipe 11.
  • the five high-pressure compressors 1 2 8 are arranged side by side in series.
  • the compression section 12 performs multi-stage compression, which reduces the pressure of the boil-off gas to 3 It is boosted up to.
  • An extraction pipe 20 is branched from a pipe connecting the high-pressure compressors 1 2 3 to each other.
  • the extraction pipe 20 is the second high-pressure compressor counting from the upstream side. ⁇ 02020/175077 9 ⁇ (: 171?2020/004619
  • Bleed pipe 2 0 is to bleed part of the ball Iruofugasu flowing through the pipe connecting the 1 2 3 between the high-pressure compressor, and supplies the extracted the BOG to the reliquefaction apparatus 1 3.
  • the extraction pipe 2 0 is provided bleed pipe valve 2 0 3.
  • Bleed arrangement Kanben 2 0 3 by adjusting the degree of opening, it is possible to adjust the flow rate of Boiruo Fugasu flowing the bleed pipe 2 within 0.
  • the bleed pipe valve 2 0 3 can also be a full ⁇ state and fully open state.
  • the reliquefaction device 13 is composed of a plurality of liquefaction compressors 2 1 (three units in this embodiment) to which boil-off gas is supplied from the extraction pipe 20 and a liquefaction compressor 21. Drives the heat exchanger 22 that cools the boil-off gas that has been cooled, the expansion turbine 23 that expands part of the boil-off gas that has been cooled by the heat exchanger 22, and the liquefaction compressor 21 and the expansion turbine 23. It has a motor 24 that operates.
  • the liquefying compressors 21 are connected to each other by pipes 2 13. Further, the three liquefying compressors 21 are arranged side by side in series. That is, the three liquefying compressors 21 perform multi-stage compression to increase the pressure of the boil-off gas. Moreover, the three liquefying compressors 21 are connected by one drive shaft 25. The drive shaft 25 is connected to the expansion turbine 23 and the motor 24, and is rotationally driven by the driving force of the motor 24. The boil-off gas discharged from the most downstream liquefaction compressor 21 is supplied to the heat exchanger 22 through the first reliquefaction pipe 26.
  • the heat exchanger 22 is composed of the boil-off gas compressed by the liquefaction compressor 21, the boil-off gas expanded by the expansion turbine 23 and the gas-phase boil-off gas separated by the gas-liquid separator 14 , Heat exchange.
  • the boil-off gas compressed by the liquefying compressor 21 is cooled by heat exchange, and the _ part is condensed (liquefied) and becomes a gas-liquid mixed state.
  • the boil-off gas in a gas-liquid mixed state discharged from the heat exchanger 22 (specifically, the fluid in which the boil-off gas and the reliquefied !_ N 0 are mixed) is passed through the second reliquefaction pipe 27. , Is supplied to the gas-liquid separator 14.
  • the second re-liquefaction pipe 2 7, re-liquefaction pipe valve 2 7 3 are provided. Reliquefaction piping valve 2 7 3 ⁇ 02020/175077 10 ((171?2020/004619
  • reliquefaction pipe valve 2 7 3 may be fully closed and fully open state.
  • an extraction pipe 28 branches from a pipe through which the compressed boil-off gas flows.
  • the extraction pipe 28 extracts part of the boil-off gas that has cooled after exchanging heat to some extent and supplies it to the expansion turbine 23.
  • the expansion turbine 23 is connected to the drive shaft 25 and is rotated by the drive force of the motor 24 transmitted via the drive shaft 25.
  • the expansion tank 23 adiabatically expands the supplied boil-off gas to lower the temperature.
  • the boil-off gas expanded by the expansion turbine 23 (hereinafter referred to as “cooling source gas”) is supplied to the heat exchanger 22 through the first cooling source gas pipe 29.
  • the cooling source gas supplied to the heat exchanger 22 exchanges heat with the boil-off gas compressed by the liquefying compressor 21 to cool the compressed boil-off gas.
  • the cooling source gas discharged from the heat exchanger 22 flows into the extraction pipe 20 through the second cooling source gas pipe 30. That is, the downstream end of the second cooling source gas pipe 30 is connected to an intermediate position of the extraction pipe 20.
  • the downstream end of the second cooling source gas pipe 30 is connected between the extraction pipe valve 20 3 and the reliquefaction device 13 in the extraction pipe 20.
  • the gas-liquid separator 14 is configured in a drum shape, and separates the supplied boil-off gas in a gas-liquid mixed state into a gas phase and a liquid phase (reliquefied!-N 0 ).
  • the recycling line 3 2, recirculation pipe valve 3 2 3 is provided.
  • Recirculation distribution Kanben 3 2 3 by adjusting the degree of opening, it is possible to adjust the flow rate of 1_ ⁇ flowing through the recirculation pipe 3 in 2.
  • the recirculation pipe valve 3 2 3 may also be in the fully closed state ⁇ beauty fully open state.
  • a separation gas pipe 33 is connected to the upper part of the gas-liquid separator 14.
  • the separation gas pipe 33 is in the interior of which gas-phase boil-off gas separated by the gas-liquid separator 14 (hereinafter referred to as “separation gas”) flows, and the separation gas is used for the boiler 15 and the main engine. This is a pipe for leading to the engine 2.
  • the separation gas pipe 33 connects the gas-liquid separator 14 and the boiler supply pipe 19. That is, the downstream end of the separated gas pipe 33 is connected to an intermediate position of the boiler supply pipe 19. In detail, the downstream end of the separation gas pipe 33 is connected between the first valve 193 and the boiler 15. Further, a heat exchanger 22 is provided at an intermediate position of the separation gas pipe 33.
  • the separated gas supplied to the heat exchanger 22 exchanges heat with the boil-off gas compressed by the liquefying compressor 21 to cool the compressed boil-off gas.
  • a separation gas pipe valve 34 is provided upstream of the heat exchanger 22 in the separation gas pipe 33. By adjusting the opening of the separation gas pipe valve 34, the flow rate of the separation gas flowing through the separation gas pipe 33 can be adjusted.
  • the separation gas pipe valve 34 can be in a fully closed state or a fully open state.
  • a calorimeter 35 (calorific value measuring unit) and a second valve 33 3 are provided on the downstream side of the heat exchanger 22.
  • Calorimeter 35 is provided on an upstream side of the second valves 3 3 3.
  • the calorimeter 35 measures the calorific value of the boil-off gas flowing through the inside of the supply pipe 11 with the separation gas pipe 33.
  • the calorimeter 35 transmits the measured calorific value to the control device 50.
  • the second valve 3 3 3 by adjusting the degree of opening, it is possible to adjust the flow rate of the separation gas flowing through the separation gas pipe 3 3.
  • the second valve 3 3 3 may also be a fully closed state and the fully open state.
  • a branch pipe 36 branches from an intermediate position of the separation gas pipe 33.
  • the separated gas pipe 3 3 between the calorimeter 35 and the second valve 3 3 3 ⁇ 02020/175077 12 ((171?2020/004619
  • the branch pipe 36 is branched.
  • the branch pipe 36 has a branch gas flowing therein, and connects the separated gas pipe 33 and the supply pipe 11 to each other. That is, the downstream end of the branch pipe 36 is connected to the supply pipe 11. Specifically, the downstream end of the branch pipe 36 is connected to the upstream side of the branch position of the boiler supply pipe 19 in the supply pipe 11.
  • a third valve 3 63 is provided in the branch pipe 36.
  • Third valve 3 6 3 by adjusting the degree of opening, it is possible to adjust the flow rate of the BOG to through flow branch pipe 3 6.
  • the third valve 3 6 3 can be fully closed and fully open state.
  • the separated gas can be guided to the boiler 15 by the separated gas pipe 33 and a part of the boiler supply pipe 19. Further, the separated gas can be guided to the engine 2 for the main engine by a part of the separated gas pipe 33, a branch pipe 36 and a part of the supply pipe 11. Also, by controlling the opening and closing of the second valve 3 3 3 provided in the separation gas pipe 33 and the third valve 3 6 3 provided in the branch pipe 36, the separation gas is guided to the boiler 15. It is possible to switch between main engine 2 and main engine 2.
  • the boiler 15 includes a furnace 38, a burner (not shown) that forms a flame in the furnace 38, an upper steam drum 39, and a lower water drum 40. And a pipe (not shown) that connects the steam drum 39 and the water drum 40.
  • PANA is capable of fueling both fuel oil and fuel gas.
  • Boil-off gas or separation gas is supplied to the planner via a boiler supply pipe 19. Further, fuel oil is supplied to the planner through a fuel oil pipe (not shown).
  • the burner forms a flame in the furnace 38 by burning fuel oil, combustion gas (boil-off gas, etc.) or both. When a flame is formed in the furnace 38 by the burner, the feed water in the boiler 15 is heated.
  • the heated feed water rises from the lower water drum 40 to the upper steam drum 39 via a boiler pipe (not shown).
  • a boiler pipe (not shown).
  • gas and liquid are separated.
  • the separated steam is supplied to the boiler steam supply pipe (not shown). Is supplied to each device that requires steam.
  • the steam drum 39 is provided with a pressure gauge (pressure measuring unit) 41 for measuring the steam pressure in the steam drum 39.
  • the pressure gauge 41 sends the measured steam pressure in the steam drum 39 to the control device 50.
  • the economizer 6 generates steam by exchanging heat between the combustion exhaust gas discharged from the power generation diesel engine 5 and water.
  • the economizer 6 and the steam drum 39 are connected by a steam pipe 42.
  • the fluid in the gas-liquid mixed state generated by the economizer 6 is supplied to the steam drum 39 via the steam pipe 42, and is separated into the gas and liquid by the steam drum 39.
  • the separated steam is supplied to each device through a boiler steam supply pipe (not shown).
  • the water drum 40 and the economizer 6 are connected by a water supply pipe 43.
  • the water supply pipe supplies the water in the water drum 40 to the economizer 6 by means of a pump 44 provided at an intermediate position.
  • the boat 1 is provided with a control device 50.
  • the control device 50 includes, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), a computer-readable storage medium, and the like.
  • a series of processes for realizing various functions are stored in a storage medium or the like in the form of a program as an example, and the CPU reads the program into RAM or the like to execute the information processing/arithmetic processing. By doing so, various functions are realized.
  • the program is installed in advance in a ROM or other storage medium, provided in a state of being stored in a computer-readable storage medium, or distributed via wired or wireless communication means. The form etc. may be applied.
  • Computer-readable storage media include magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, semiconductor memories, and the like.
  • the control device 50 can control the opening degree of each valve (including the first valve 19a to the third valve 36a) provided in the boil-off gas treatment system 4 from 0% to 100%. It is said that. As shown in Fig. 2, the controller 50 controls the calorimeter 35 ⁇ 02020/175077 14 ⁇ (: 171?2020/004619
  • Determination unit 51 that determines the supply destination of the separation gas based on the amount of heat measured by and the second valve 3 3 3 and the third valve so that the separation gas is supplied to the supply destination determined by the determination unit 5 1.
  • a switching control unit 52 for controlling the control unit 3 6 and a storage unit 5 3 for storing a predetermined threshold value are provided.
  • the predetermined threshold value stored in the storage unit 53 includes, for example, a lower limit value of the heat quantity of the fuel with which the engine 2 for the main engine can suitably burn.
  • the determining unit 51 determines that the separated gas is supplied to the engine for the main engine. If it is less than the predetermined threshold, the separation gas supply destination is determined to be the boiler 15.
  • the switching control unit 52 completely closes the second valve 333 provided in the separated gas pipe 33. with the opening 10 percent of the state), the third valve 3 6 3 provided in the branch pipe 3 6 fully opened (opening 1 0 0% state). At this time, the first valve 1 9 3 provided in the boiler feed pipe 1 9 fully closed state.
  • the switching control unit 52 fully opens the second valve 3 33 provided in the separated gas pipe 33. , Fully close the third valve 3 6 3 provided on the branch pipe 36. At this time, the first valve 193 provided on the boiler supply pipe 19 is fully closed.
  • the boil-off gas compressed in the compression section 12 flows through the supply pipe 11 and is supplied to the engine 2 for the main engine and burned as fuel. A part of the boil-off gas compressed in the compression section 12 flows into the power generation engine supply pipe 16 and is supplied to the power generation engine. Also, if not require BOG main machine engine 2, a circulation pipe valve 1 7 3 provided in the circulation pipe 1 7 to the open state, the boil-off gas, through the circulation piping 1 7 supply Return to piping 1 1.
  • the boil-off gas in a gas-liquid mixed state discharged from the heat exchanger 22 (specifically, the fluid in which the boil-off gas and the reliquefied !_ ⁇ are mixed) is passed through the second reliquefaction pipe 27. , Is supplied to the gas-liquid separator 14.
  • the boil-off gas in a gas-liquid mixed state is separated into a gas phase (separated gas) and a liquid phase (reliquefied !-N 0 ).
  • boil-off gas contains nitrogen, it is difficult to liquefy nitrogen as compared with other components (such as methane), so the gas phase separated gas (separated gas) has a nitrogen content. It becomes a large amount of gas. Reliquefied It is led to each tank 3 via. In this way, the boil-off gas is reliquefied and returned to tank 3.
  • the separated gas is supplied to the heat exchanger 22 through the separated gas pipe 33. The separated gas that has completed heat exchange in the heat exchanger 22 flows through the separated gas pipe 33.
  • the supply destination of the separated gas flowing in the separated gas pipe 33 is the boiler 15 (That is, when the second valve 33a is open and the third valve 36a is closed), it is supplied to the boiler 15 through the boiler supply pipe 19 and is used as fuel. Burned.
  • the supply destination is the engine 2 for the main engine (that is, when the second valve 33a is closed and the third valve 36a is open)
  • supply it via the branch pipe 36.
  • it flows into the supply pipe 11 it is guided to the engine 2 for the main engine through the compression unit 12 and the like.
  • the separated gas separated by the gas-liquid separator 14 can be introduced to both the engine 2 for the main engine and the boiler 15. Therefore, the separated gas can be burned and used as fuel in the engine 2 for the main engine and/or the boiler 15. Therefore, it is possible to improve the energy efficiency of the entire system, as compared with the configuration in which the separated gas is not used (the configuration in which the separated gas is burned by GCU (Gas Combustion on Unit) or the like).
  • the second valve 33a and the third valve 36a can be used to switch whether the separated gas is introduced to the main engine 2 or the boiler 15.
  • the separated gas can be guided to a desired device of either the main engine 2 or the boiler 15 device. Therefore, for example, the separated gas can be guided to the supply destination according to the operating conditions of the engine 2 for the main engine and the boiler 15 and the components of the separated gas. Therefore, the separated gas can be appropriately burned in the main engine 2 and the boiler 15.
  • the separation gas since nitrogen is difficult to liquefy, the separation gas tends to have a large nitrogen content. Therefore, the gas having a large nitrogen content has a low heat amount and may not be appropriately combusted in the engine 2 for the main engine.
  • the calorimeter 35 measures the calorific value of the separated gas, and the supply destination is determined based on the measured calorific value.
  • the separation gas supply destination can be an appropriate supply destination from the viewpoint of the amount of heat.
  • the heat quantity of the separated gas (the heat quantity measured by the calorimeter 35 is ) Is larger than the predetermined threshold value stored in the storage unit 53, the supply destination of the separated gas is determined to be the engine 2 for the main engine.
  • the separated gas when the separated gas has a large amount of heat and the separated gas can be suitably burned in the main engine 2, the separated gas can be guided to the main engine 2 and burned appropriately.
  • the amount of heat of the separated gas is so small that the separated gas cannot be suitably burned by the engine 2 for the main engine (in other words, the amount of heat of the separated gas is less than the predetermined threshold value stored in the storage unit 53).
  • the separated gas can be burned and the energy generated by the burning process can be used for generating steam.
  • the separated gas can be guided to the supply destination according to the amount of heat. Further, no matter which supply destination the separation gas is supplied to, the energy generated by the combustion can be utilized, so that the energy efficiency can be improved.
  • a combustion processing device such as a GCU (Gas Combustion on Unit) used only for burning the separated gas that cannot be suitably combusted in the main engine 2. ..
  • Vessel 1 may be equipped with a boiler to generate steam for use onboard when it is necessary to generate steam for use onboard.
  • the combustion treatment device in the configuration provided with the combustion treatment device, it is necessary to provide both the combustion treatment device and the boiler in the ship 1.
  • the separated gas that cannot be suitably burned in the main engine 2 can be burned in the boiler 15 and the steam can be generated.
  • the combustion processing device can be omitted. Therefore, the structure can be simplified as compared with the structure in which the combustion processing device is provided.
  • the separation gas pipe 33 is provided with a nitrogen content measuring device (nitrogen content measuring unit) for measuring the nitrogen content of the separation gas.
  • a nitrogen content measuring device nitrogen content measuring unit
  • the storage unit 53 stores the upper limit value of the nitrogen content of the fuel that can be suitably burned by the engine 2 for the main engine as a predetermined threshold value, which is different from the above embodiment. ..
  • the determination unit 51 determines the supply destination of the separation gas to the engine 2 for the main engine when the nitrogen content of the separation gas is less than a predetermined threshold value, which is a difference from the above embodiment.
  • the separation gas supply destination can be an appropriate supply destination from the viewpoint of the nitrogen content.
  • the supply destination of the separated gas is determined to be the boiler 15.
  • the separated gas when the separated gas has a large nitrogen content and the separated gas cannot be suitably burned in the engine 2 for the main engine, the separated gas can be suitably burned in the boiler 15.
  • the supply destination of the separated gas is determined to be the engine 2 for the main engine.
  • the separated gas when the separated gas has a low nitrogen content and the separated gas can be suitably burned in the main engine 2, the separated gas can be preferably burned in the main engine 2.
  • the separation gas As described above, nitrogen is difficult to liquefy, and the separation gas tends to have a large nitrogen content. Therefore, by determining the supply destination from the viewpoint of the nitrogen content, the separation gas can be more directly connected. The separation gas can be supplied to the supply destination according to the component of. Therefore, the separation gas supply destination can be a more appropriate supply destination from the viewpoint of the nitrogen content.
  • the supply destination of the separated gas may be determined based on the measurement result of the pressure gauge 41 that measures the steam pressure in the steam drum 39 of the boiler 15.
  • the determination unit 51 determines that the pressure measured by the pressure gauge 41 is a predetermined value. ⁇ 02020/175077 19 ⁇ (: 171?2020/004619
  • the separation gas supply destination When it is lower than the threshold value of 1, the separation gas supply destination may be determined to be the boiler 15.
  • the predetermined threshold value is, for example, a set value which is said to be able to cover the amount of steam required onboard the ship. Also, instead of a predetermined threshold value, the amount of steam required onboard the ship may be sequentially acquired, and if the pressure is lower than the required amount of steam, the supply destination of the separated gas may be determined as the boiler 15 ..
  • the separated gas can be guided to the boiler 15 when the steam is not appropriately generated in the boiler 15. Therefore, it is possible to preferably stably generate steam in the boiler 15.
  • the separation gas supply destination is the boiler 1
  • control device 50 operates the first valve 193 to the third valve 363
  • the present invention is not limited to this.
  • the opening/closing state of the first valve 193 to the third valve 363 may be switched by an operator's operation.

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Abstract

A boil-off gas treatment system (4) is provided with: a boiler (15) that is capable of burning boil-off gas produced in a tank (3) storing LNG and generates steam; a re-liquefaction device (13) for performing liquefaction of the boil-off gas produced in the tank (3); a gas-liquid separator (14) for separating the boil-off gas in a gas-liquid mixed state after the liquefaction in the re-liquefaction device (13) into a gaseous phase and a liquid phase; a flow path for guiding the gaseous-phase boil-off gas separated by the gas-liquid separator (14) to a main engine (2); a flow path for guiding the gaseous phase boil-off gas separated by the gas-liquid separator (14) to the boiler (15); and a first valve (19a), a second valve (33a) and a third valve (36a) for switching the guiding of the gaseous-phase boil-off gas separated by the gas-liquid separator (14) to the main engine (2) or the boiler (15).

Description

明 細 書 Specification

発明の名称 ： ボイルオフガス処理システム及び船舶 Title of invention: Boil-off gas treatment system and ship

技術分野 Technical field

[0001] 本発明は、 ボイルオフガス処理システム及び船舶に関するものである。 [0001] The present invention relates to a boil-off gas treatment system and a ship.

背景技術 Background technology

[0002] L NG (Liquefied Natural Gas) や L PG (Liquefied Petroleum Ga s) 等の液化ガスを運搬する船舶では、 液化ガスを貯留しているタンク内で液 化ガスが蒸発し、 ボイルオフガスが発生する。 タンク内でボイルオフガスが 発生すると、 タンク内の圧力が高まって所定の圧力を超えてしまう可能性が ある。 このため、 液化ガスを運搬する船舶には、 タンクから取り出したボイ ルオフガスに対して再液化処理を施す再液化装置が設けられている。 再液化 装置で液化処理を施されたボイルオフガスは、 すべてが液化せずに気液混合 状態となる場合がある。 このため、 液化処理を施した後の気液混合状態のボ イルオフガスに対して気液分離処理を施し、 気相と液相とに分離する場合が ある (例えば、 特許文献 1及び特許文献 2) 。 [0002] In ships that carry liquefied gas such as L NG (Liquefied Natural Gas) and L PG (Liquefied Petroleum Gas), the liquefied gas evaporates in the tank storing the liquefied gas and boil-off gas is generated. To do. If boil-off gas is generated in the tank, the pressure in the tank may increase and may exceed a predetermined pressure. For this reason, ships that carry liquefied gas are equipped with a reliquefaction device that reliquefies the boiler-off gas taken out of the tank. The boil-off gas that has been liquefied by the reliquefaction device may not be liquefied and may be in a gas-liquid mixed state. Therefore, there is a case where the boil-off gas in the gas-liquid mixed state after the liquefaction treatment is subjected to the gas-liquid separation treatment and separated into a gas phase and a liquid phase (for example, Patent Document 1 and Patent Document 2). ..

[0003] 特許文献 1 には、 L NGタンクから発生する BOGが、 BOGコンブレツ サにより圧縮された後、 熱交換器により冷却されて再液化するようになって いる装置が記載されている。 この装置では、 熱交換器の液化部で、 BOGが 飽和状態まで冷却され、 その下流側に設けられた気液分離ドラムで、 飽和状 態にある液から非凝縮成分が分離される。 そして、 これにより得られた窒素 リツチガスは適宜に抜き出されて、 ボイラで処理される。 [0003]Patent Document 1 describes a device in which BOG generated from an L NG tank is compressed by a BOG compressor and then cooled by a heat exchanger to be reliquefied. In this device, the BOG is cooled to the saturated state in the liquefaction part of the heat exchanger, and the non-condensed component is separated from the saturated liquid by the gas-liquid separation drum provided on the downstream side. Then, the nitrogen rich gas thus obtained is appropriately extracted and treated in the boiler.

[0004] 特許文献 2には、 L N G貯槽から発生する B〇 Gを再液化装置で再液化し て窒素分離器で液化メタンと混合ガスとに分離する装置が記載されている。 この装置では、 窒素ガス含有率が基準範囲外となるときのみ窒素ガスを含む 混合ガスを系外に排出され、 ボイラ槽で燃焼される。 [0004] Patent Document 2 describes a device that re-liquefies B0G generated from an LNG storage tank by a reliquefaction device and separates it into liquefied methane and a mixed gas by a nitrogen separator. In this device, the mixed gas containing nitrogen gas is discharged out of the system and burned in the boiler tank only when the nitrogen gas content is out of the standard range.

先行技術文献 Prior art documents

特許文献 \¥02020/175077 2 卩（：171?2020/004619 Patent literature \¥02020/175077 2 (:171?2020/004619

[0005] 特許文献 1 :特許第 3 9 0 8 8 8 1号公報 [0005] Patent Document 1: Patent No. 3908881

特許文献 2 :特開 2 0 0 0— 3 3 8 0 9 3号公報 Patent Document 2: Japanese Unexamined Patent Publication No. 20000—3 3 8 0 9 3

発明の概要 Summary of the invention

発明が解決しようとする課題 Problems to be Solved by the Invention

[0006] 特許文献 1及び特許文献 2に記載の装置では、 分離された気相のボイルオ フガスを主機用内燃機関で利用することを考慮していない。 このような装置 において、 分離装置で分離された気相のボイルオフガスを主機用内燃機関で 利用する場合には、 分離された気相のボイルオフガスの全量を主機用内燃機 関へ供給することとなる。 しかしながら、 分離された気相のボイルオフガス の成分や、 主機用内燃機関の運転状態によっては、 分離された気相のボイル オフガスを主機用内燃機関で好適に燃焼させることができない場合がある。 [0006] The devices described in Patent Document 1 and Patent Document 2 do not consider the use of the separated vapor phase boil-off gas in the internal combustion engine for the main engine. In such a device, when the gas-phase boil-off gas separated by the separator is used in the main engine internal combustion engine, the entire amount of the separated gas-phase boil-off gas is supplied to the main engine internal combustion engine. .. However, depending on the components of the separated gas-phase boil-off gas and the operating conditions of the main engine internal combustion engine, the separated gas-phase boil-off gas may not be suitably combusted in the main engine internal combustion engine.

[0007] 本発明は、 このような事情に鑑みてなされたものであって、 再液化された 気液混合状態のボイルオフガスから分離された気相のボイルオフガスを所望 の装置へ供給することで、 好適に燃焼させることができるボイルオフガス処 理システム及び船舶を提供することを目的とする。 [0007] The present invention has been made in view of the above circumstances, and it is possible to supply a gas phase boil-off gas separated from a reliquefied gas-liquid mixed boil-off gas to a desired device. An object of the present invention is to provide a boil-off gas treatment system and a ship that can be suitably burned.

課題を解決するための手段 Means for solving the problem

[0008] 上記課題を解決するために、 本発明のボイルオフガス処理システム及び船 舶は以下の手段を採用する。 [0008] In order to solve the above problems, the boil-off gas treatment system and the ship of the present invention employ the following means.

本発明の一態様に係るボイルオフガス処理システムは、 液化ガスが貯留さ れているタンクで発生したボイルオフガスを燃焼可能であって、 蒸気を生成 するボイラと、 前記タンクで発生したボイルオフガスに対して液化処理を行 う再液化装置と、 前記再液化装置で液化処理が行なわれた気液混合状態のボ イルオフガスを気相と液相とに分離する分離部と、 前記分離部で分離された 気相のボイルオフガスを、 ボイルオフガスを燃焼可能である主機用内燃機関 とへ導く第 1配管と、 前記分離部で分離された気相のボイルオフガスを前記 ボイラへ導く第 2配管と、 前記分離部で分離された気相のボイルオフガスを 前記主機用内燃機関へ導くか、 前記ボイラへ導くかを切り換える切換部と、 を備えている。 \¥02020/175077 3 卩（：171?2020/004619 A boil-off gas processing system according to an aspect of the present invention is capable of burning boil-off gas generated in a tank in which liquefied gas is stored, and a boiler that generates steam, and boil-off gas generated in the tank. A liquefaction device that performs liquefaction treatment, a separation unit that separates the gas-liquid mixed boil-off gas that has been liquefied by the reliquefaction device into a gas phase and a liquid phase, and a separation unit that separates A first pipe that guides the gas-phase boil-off gas to an internal combustion engine for a main engine that can burn the boil-off gas; a second pipe that guides the gas-phase boil-off gas separated by the separation unit to the boiler; and the separation. A gas phase boil-off gas separated in the section is introduced into the internal combustion engine for the main engine or into the boiler. \\02020/175077 3 ((171?2020/004619

[0009] 上記構成では、 分離部で分離された気相のボイルオフガス （以下、 「分離 ガス」 という。 ） を主機用内燃機関へ導く第 1配管と、 分離ガスをボイラへ 導く第 2配管とを備えている。 これにより、 分離ガスを、 主機用内燃機関と ボイラとの何れにも導くことができる。 したがって、 分離ガスを、 燃焼処理 できるとともに、 主機用内燃機関及び/またはボイラで燃料として利用する ことができる。 よって、 分離ガスを利用しない場合と比較して、 システム全 体のエネルギ効率を向上させることができる。 [0009] In the above configuration, the gas-phase boil-off gas separated by the separation unit (hereinafter, referred to as "separated gas") is connected to the internal combustion engine for the main engine, and the second pipe is connected to the boiler. Equipped with. As a result, the separated gas can be introduced to both the internal combustion engine for the main engine and the boiler. Therefore, the separated gas can be burnt and used as fuel in the internal combustion engine for the main engine and/or the boiler. Therefore, the energy efficiency of the entire system can be improved as compared with the case where the separated gas is not used.

[0010] また、 分離ガスを主機用内燃機関へ導くか、 ボイラへ導くかを切り換える 切換部を備えている。 これにより、 分離ガスを、 主機用内燃機関及びボイラ のいずれかの装置のうち、 所望の装置へ導くことができる。 したがって、 例 えば、 主機用内燃機関及びボイラの運転状態や、 分離ガスの成分等に応じた 供給先へ分離ガスを導くことができる。 よって、 主機用内燃機関及びボイラ で好適に分離ガスを燃焼させることができる。 [0010] Further, a switching unit is provided for switching whether to guide the separated gas to the internal combustion engine for the main engine or to the boiler. As a result, the separated gas can be guided to a desired one of the internal combustion engine for the main engine and the boiler. Therefore, for example, the separated gas can be guided to the supply destination according to the operating conditions of the internal combustion engine for the main engine and the boiler, the components of the separated gas, and the like. Therefore, the separated gas can be suitably burned in the internal combustion engine for the main engine and the boiler.

[001 1 ] また、 本発明の一態様に係るボイルオフガス処理システムは、 前記分離部 で分離された気相のボイルオフガスの窒素含有量を計測する窒素含有量計測 部と、 前記窒素含有量計測部が計測した窒素含有量に基づいて、 前記分離部 で分離された気相のボイルオフガスの供給先を決定する決定部と、 前記分離 部で分離された気相のボイルオフガスが、 前記決定部が決定した供給先へ供 給されるように前記切換部を制御する切換制御部と、 を備えていてもよい。 [001 1] Further, the boil-off gas treatment system according to an aspect of the present invention is a nitrogen content measuring unit that measures a nitrogen content of a gas-phase boil-off gas separated by the separating unit, and the nitrogen content measuring unit. A determination unit that determines a supply destination of the gas-phase boil-off gas separated by the separation unit, and a gas-phase boil-off gas separated by the separation unit, based on the nitrogen content measured by the separation unit; A switching control unit that controls the switching unit so that the switching unit is supplied to the supply destination determined by.

[0012] 上記構成では、 分離ガスの窒素含有量を計測し、 計測した窒素含有量に基 づいて供給先を決定している。 これにより、 分離ガスの供給先を、 窒素含有 量の観点から適切な供給先とすることができる。 したがって、 例えば、 分離 ガスが、 窒素含有量の観点から主機用内燃機関で好適に燃焼させることがで きないガスである場合に、 分離ガスをボイラに導くことで、 分離ガスを燃焼 処理することができるとともに、 燃焼処理に伴って生じたエネルギを蒸気の 生成に利用することができる。 よって、 燃焼処理に伴って生じたエネルギを 利用しない構成と比較して、 エネルギ効率を向上させることができる。 この ように、 上記構成では、 分離ガスを窒素含有量に応じた供給先へ導くことが \¥02020/175077 卩（：171?2020/004619 [0012] In the above configuration, the nitrogen content of the separated gas is measured, and the supply destination is determined based on the measured nitrogen content. As a result, the separation gas supply destination can be an appropriate supply destination from the viewpoint of the nitrogen content. Therefore, for example, when the separated gas is a gas that cannot be suitably combusted in the internal combustion engine for the main engine from the viewpoint of the nitrogen content, the separated gas is guided to the boiler to burn the separated gas. In addition, the energy generated by the combustion process can be used to generate steam. Therefore, it is possible to improve energy efficiency as compared with a configuration in which the energy generated by the combustion process is not used. Thus, in the above configuration, the separated gas can be guided to the supply destination according to the nitrogen content. \\02020/175077 卩(: 171?2020/004619

できるとともに、 エネルギ効率を向上させることができる。 In addition to being able to do so, it is possible to improve energy efficiency.

[0013] また、 主機用内燃機関で好適に燃焼させることができない分離ガスを燃焼 処理するために、 分離ガスを処理するための専用の燃焼装置 （以下、 「燃焼 処理装置」 という。 ） を設けることも考えらえる。 このような燃焼処理装置 を設けた構成では、 蒸気を生成する必要がある場合に、 燃焼処理装置及びボ イラの両方を設ける必要がある。 一方、 上記構成では、 主機用内燃機関で好 適に燃焼させることができない分離ガスをボイラで燃焼させるとともに、 蒸 気を生成することができる。 これにより、 燃焼処理装置を設けない構成とす ることができる。 したがって、 燃焼処理装置を設ける場合と比較して、 構成 を簡素化することができる。 [0013] Further, in order to combust and process the separated gas that cannot be suitably combusted in the internal combustion engine for the main engine, a dedicated combustion device for processing the separated gas (hereinafter referred to as "combustion processing device") is provided. I can think of things. In such a configuration with a combustion treatment device, it is necessary to provide both a combustion treatment device and a boiler when it is necessary to generate steam. On the other hand, in the above configuration, the separated gas, which cannot be suitably combusted in the internal combustion engine for the main engine, is combusted in the boiler and the steam can be generated. As a result, the combustion processing device can be omitted. Therefore, the structure can be simplified as compared with the case where the combustion processing device is provided.

[0014] なお、 決定部が行う窒素含有量に基づく決定は、 窒素含有量が所定の閾値 を超えているか否かによって行われてもよい。 すなわち、 決定部は、 窒素含 有量計測部が計測した窒素含有量が、 所定の閾値を超えていた場合に、 分離 ガス （分離部で分離された気相のボイルオフガス） の供給先をボイラに決定 してもよい。 このように構成することで、 分離ガスの供給先を、 窒素含有量 の観点からより適切な供給先とすることができる。 すなわち、 分離ガスの窒 素含有量が多く、 主機用内燃機関で好適に燃焼させることができない場合に 、 分離ガスを主機用内燃機関へ導かないようにすることができる。 所定の閾 値とは、 例えば、 主機用内燃機関が、 好適に燃焼させることができる燃料の 窒素含有量の上限値が挙げられる。 [0014] Note that the determination based on the nitrogen content performed by the determining unit may be performed depending on whether or not the nitrogen content exceeds a predetermined threshold value. That is, when the nitrogen content measured by the nitrogen content measurement unit exceeds a predetermined threshold, the determination unit determines the supply destination of the separation gas (gas phase boil-off gas separated by the separation unit) as a boiler. You may decide to With this configuration, the separation gas supply destination can be a more appropriate supply destination from the viewpoint of the nitrogen content. That is, when the separated gas has a high nitrogen content and cannot be suitably combusted in the main engine internal combustion engine, the separated gas can be prevented from being guided to the main engine internal combustion engine. The predetermined threshold value is, for example, the upper limit value of the nitrogen content of the fuel that can be suitably combusted by the internal combustion engine for the main engine.

[0015] また、 本発明の一態様に係るボイルオフガス処理システムは、 前記分離部 で分離された気相のボイルオフガスの熱量を計測する熱量計測部と、 前記熱 量計測部が計測した熱量に基づいて、 前記分離部で分離された気相のボイル オフガスの供給先を決定する決定部と、 前記分離部で分離された気相のボイ ルオフガスが、 前記決定部が決定した供給先へ供給されるように前記切換部 を制御する切換制御部と、 を備えていてもよい。 [0015] The boil-off gas treatment system according to an aspect of the present invention includes a calorific value measurement unit that measures the calorific value of the vapor-phase boil-off gas separated by the separation unit, and a calorific value measured by the calorific value measurement unit. Based on the above, the determination unit that determines the supply destination of the vapor-phase boil-off gas separated by the separation unit and the vapor-phase boiler off-gas that is separated by the separation unit are supplied to the supply destination determined by the determination unit. And a switching control unit that controls the switching unit.

[0016] 上記構成では、 分離ガスの熱量を計測し、 計測した熱量に基づいて供給先 を決定している。 これにより、 分離ガスの供給先を、 熱量の観点から適切な \¥02020/175077 5 卩（：171?2020/004619 [0016] In the above configuration, the heat quantity of the separated gas is measured, and the supply destination is determined based on the measured heat quantity. This ensures that the separation gas supply destination is appropriate from the viewpoint of heat quantity. \\02020/175077 5 ((171?2020/004619

供給先とすることができる。 したがって、 例えば、 分離ガスが、 熱量の観点 から主機用内燃機関で好適に燃焼させることができないガスである場合に、 分離ガスをボイラに導くことで、 分離ガスを燃焼処理することができるとと もに、 燃焼処理に伴って生じたエネルギを蒸気の生成に利用することができ る。 よって、 燃焼処理に伴って生じたエネルギを利用しない構成と比較して 、 エネルギ効率を向上させることができる。 このように、 上記構成では、 分 離ガスを熱量に応じた供給先へ導くことができるとともに、 エネルギ効率を 向上させることができる。 It can be a supplier. Therefore, for example, when the separated gas is a gas that cannot be suitably burned in the internal combustion engine for the main engine from the viewpoint of heat quantity, it is possible to perform the combustion treatment of the separated gas by guiding it to the boiler. At the same time, the energy produced by the combustion process can be used to generate steam. Therefore, it is possible to improve energy efficiency, as compared with a configuration in which the energy generated by the combustion process is not used. As described above, in the above configuration, the separated gas can be guided to the supply destination according to the amount of heat, and the energy efficiency can be improved.

[0017] また、 主機用内燃機関で好適に燃焼させることができない分離ガスを燃焼 処理するために、 燃焼処理装置を設けることも考えらえる。 このような燃焼 処理装置を設けた構成では、 蒸気を生成する必要がある場合に、 燃焼処理装 置及びボイラの両方を設ける必要がある。 一方、 上記構成では、 主機用内燃 機関で好適に燃焼させることができない分離ガスをボイラで燃焼させるとと もに、 蒸気を生成することができる。 これにより、 燃焼処理装置を設けない 構成とすることができる。 したがって、 燃焼処理装置を設ける場合と比較し て、 構成を簡素化することができる。 [0017] It is also conceivable to provide a combustion treatment device in order to perform combustion treatment on the separated gas that cannot be suitably combusted in the internal combustion engine for the main engine. In the configuration provided with such a combustion treatment device, it is necessary to provide both the combustion treatment device and the boiler when it is necessary to generate steam. On the other hand, in the above configuration, the separated gas, which cannot be suitably combusted in the internal combustion engine for the main engine, is combusted in the boiler, and the steam can be generated. As a result, the combustion processing device can be omitted. Therefore, the structure can be simplified as compared with the case where the combustion processing device is provided.

[0018] すなわち、 決定部は、 熱量計測部が計測した熱量が、 所定の閾値を超えて いた場合に、 分離ガス （分離部で分離された気相のボイルオフガス） の供給 先を主機用内燃機関に決定してもよい。 このように構成することで、 分離ガ スの供給先を、 熱量の観点からより適切な供給先とすることができる。 すな わち、 分離ガスの熱量が多く、 主機用内燃機関で好適に燃焼させることがで きるガスであった場合に、 当該ボイルオフガスを主機用内燃機関へ導くこと ができる。 所定の閾値とは、 例えば、 主機用内燃機関が、 好適に燃焼を行う ことができる燃料の熱量の下限値が挙げられる。 [0018] That is, when the calorific value measured by the calorific value measuring unit exceeds a predetermined threshold value, the determining unit determines that the separation gas (gas phase boil-off gas separated by the separating unit) is supplied to the internal combustion engine for the main engine. You may decide to the institution. With this configuration, the supply destination of the separation gas can be a more appropriate supply destination from the viewpoint of the amount of heat. That is, when the separated gas has a large amount of heat and can be suitably combusted in the main engine internal combustion engine, the boil-off gas can be guided to the main engine internal combustion engine. The predetermined threshold value is, for example, the lower limit value of the calorific value of the fuel with which the internal combustion engine for the main engine can suitably burn.

[0019] また、 本発明の一態様に係るボイルオフガス処理システムは、 前記ボイラ の圧力を計測する圧力計測部と、 前記ボイラにおいて火炎を形成する場合に 、 前記圧力計測部が計測した圧力に基づいて、 前記分離部で分離された気相 のボイルオフガスの供給先を決定する決定部と、 前記決定部が決定した供給 \¥02020/175077 6 卩（：171?2020/004619 [0019] The boil-off gas treatment system according to an aspect of the present invention is based on a pressure measuring unit that measures the pressure of the boiler, and a pressure measured by the pressure measuring unit when a flame is formed in the boiler. And a supply unit determined by the determination unit, which determines a supply destination of the gas-phase boil-off gas separated by the separation unit. \\02020/175077 6 卩(: 171-12020/004619

先へボイルオフガスが供給されるように前記切換部を制御する切換制御部と 、 を備え、 前記決定部は、 前記圧力計測部が計測した圧力が、 所定の閾値よ りも低い場合に、 前記分離部で分離された気相のボイルオフガスの供給先を 前記ボイラに決定してもよい。 A switching control unit that controls the switching unit so that boil-off gas is first supplied; and the determination unit, when the pressure measured by the pressure measurement unit is lower than a predetermined threshold, The supply destination of the gas-phase boil-off gas separated by the separation unit may be set to the boiler.

[0020] 上記構成では、 ボイラの圧力が所定の閾値よりも低い場合に、 分離ガスの 供給先をボイラに決定している。 これにより、 ボイラ内において好適に蒸気 が生成されていない場合に、 分離ガスをボイラへ導くことができる。 したが って、 ボイラにおいて好適に安定的に蒸気を生成することができる。 [0020] In the above configuration, when the boiler pressure is lower than the predetermined threshold value, the supply destination of the separated gas is determined to be the boiler. As a result, the separated gas can be guided to the boiler when steam is not appropriately generated in the boiler. Therefore, the steam can be generated in the boiler in a stable manner.

[0021 ] また、 本発明の一態様に係るボイルオフガス処理システムは、 前記分離部 で分離された気相のボイルオフガスの供給先を決定する決定部と、 前記決定 部が決定した供給先へボイルオフガスが供給されるように前記切換部を制御 する切換制御部と、 を備え、 前記決定部は、 前記ボイラにおいて火炎を形成 する場合に、 前記分離部で分離された気相のボイルオフガスの供給先を前記 ボイラに決定してもよい。 [0021] A boil-off gas treatment system according to an aspect of the present invention is a boil-off to a supply destination determined by the determination unit, and a determination unit that determines a supply destination of the gas-phase boil-off gas separated by the separation unit. A switching control unit that controls the switching unit so that gas is supplied; and, when the flame is formed in the boiler, the determination unit supplies the gas-phase boil-off gas separated by the separation unit. The destination may be the boiler.

[0022] 上記構成では、 ボイラにおいて火炎を形成する場合に、 分離ガスの供給先 をボイラに決定している。 これにより、 ボイラにおいて火炎を形成する際に 、 優先的に分離ガスを燃料とすることができる。 したがって、 火炎を形成す るための他の燃料の使用量を低減することができる。 [0022] In the above configuration, when the flame is formed in the boiler, the supply destination of the separated gas is set to the boiler. With this, when the flame is formed in the boiler, the separated gas can be preferentially used as the fuel. Therefore, the amount of other fuel used for forming the flame can be reduced.

[0023] 本発明の一態様に係る船舶は、 上記いずれかに記載のボイルオフガス処理 システムを備えている。 発明の効果 [0023] A ship according to an aspect of the present invention includes the boil-off gas treatment system according to any one of the above. Effect of the invention

[0024] 本発明によれば、 再液化された気液混合状態のボイルオフガスから分離さ れた気相のボイルオフガスを所望の装置へ導くことで、 好適に燃焼させるこ とができる。 [0024] According to the present invention, the vaporized boil-off gas separated from the reliquefied boil-off gas in a gas-liquid mixed state can be suitably burned by introducing it to a desired device.

図面の簡単な説明 Brief description of the drawings

[0025] [図 1 ]本発明の実施形態に係る船舶の概略を示した構成図である。 FIG. 1 is a configuration diagram showing an outline of a ship according to an embodiment of the present invention.

[図 2]図 1の船舶に設けられるボイルオフガス処理システムを示すブロック図 である。 発明を実施するための形態 2 is a block diagram showing a boil-off gas treatment system provided in the ship of FIG. 1. MODE FOR CARRYING OUT THE INVENTION

[0026] 以下に、 本発明に係るボイルオフガス処理システム及び船舶の一実施形態 について、 図面を参照して説明する。 [0026] An embodiment of a boil-off gas treatment system and a ship according to the present invention will be described below with reference to the drawings.

本実施形態に係るボイルオフガス処理システム 4は、 L N G （L i quef i ed Natura l Gas） を運搬する船舶 1 に適用されている。 なお、 船舶 1が運搬す る対象は L N Gに限定されず、 例えば、 L P G （L i quef i ed Pet ro leum Gas ） 等の他の液化ガスであってもよい。 The boil-off gas treatment system 4 according to the present embodiment is applied to a ship 1 that carries LNG (Liquefed Natural Gas). The target carried by the ship 1 is not limited to LNG, but may be another liquefied gas such as LPG (Liquefied Petroleum Gas).

[0027] 船舶 1は、 主機用エンジン （主機用内燃機関） 2と、 L N G （液化ガス） を貯留するタンク 3と、 タンク 3で発生したボイルオフガスを処理するボイ ルオフガス処理システム 4と、 船内で使用する電気を発電する発電用ディー ゼルエンジン 5と、 発電用ディーゼルエンジン 5から排出される排ガスの熱 を利用して蒸気を生成するエコノマイザ 6と、 を備えている。 [0027] The vessel 1 includes a main engine (internal combustion engine) 2, a tank 3 for storing LNG (liquefied gas), a boiler-off gas treatment system 4 for treating boil-off gas generated in the tank 3, and an on-board vessel. It is equipped with a power generation diesel engine 5 that generates the electricity to be used, and an economizer 6 that uses the heat of the exhaust gas discharged from the power generation diesel engine 5 to generate steam.

[0028] 主機用エンジン 2は、 燃料油及び燃料ガスの両方を燃料として燃焼させる ことができる 2ストロークのエンジンである。 主機用エンジン 2は、 燃料油 （例えば、 重油等） または燃焼ガス （例えば、 L N G等） を燃焼させること で、 駆動部 （図示省略） を駆動する。 駆動部は、 主機用エンジン 2からの駆 動力によって、 船舶 1 に推進力を与える図示省略の推進器 （例えば、 スクリ ュー等） を回転駆動する。 [0028] The main engine 2 is a two-stroke engine that can burn both fuel oil and fuel gas as fuel. The engine 2 for the main engine drives a drive unit (not shown) by burning fuel oil (for example, heavy oil) or combustion gas (for example, LNG). The drive unit rotationally drives a propulsion device (not shown) (for example, a screw) that gives a propulsive force to the ship 1 by the driving force from the main engine 2.

[0029] タンク 3は、 複数 （本実施形態では、 一例として 4つ） 設けられている。 [0029] A plurality of tanks 3 (four in this embodiment, as an example) are provided.

各タンク 3は、 例えば、 アルミニウム製であって、 その内部に、 L N Gを貯 留することができるように構成されている。 各タンク 3の上部には、 ボイル オフガスを外部へと排出する排出配管 3 aが設けられている。 Each tank 3 is made of aluminum, for example, and is configured so that LNG can be stored therein. A discharge pipe 3a for discharging boil-off gas to the outside is provided above each tank 3.

[0030] ボイルオフガス処理システム 4は、 タンク 3から排出されたボイルオフガ スを主機用エンジン 2へ供給する供給配管 1 1 と、 供給配管 1 1 を流通する ボイルオフガスを圧縮する圧縮部 1 2と、 ボイルオフガスに対して液化処理 を施す再液化装置 1 3と、 液化処理が施された気液混合状態のボイルオフガ スを気液分離する気液分離器 （分離部） 1 4と、 蒸気を生成するボイラ 1 5 と、 を備えている。 \¥02020/175077 8 卩（：171?2020/004619 [0030] The boil-off gas treatment system 4 includes a supply pipe 11 for supplying the boil-off gas discharged from the tank 3 to the engine 2 for the main engine, and a compression unit 12 for compressing the boil-off gas flowing through the supply pipe 1 1. A re-liquefaction device 13 that liquefies boil-off gas, a gas-liquid separator (separation part) 14 that separates the liquefied boil-off gas in a gas-liquid mixed state into a vapor, and vapor is generated. It is equipped with a boiler 15 and. \¥02020/175077 8 卩 (: 171?2020/004619

[0031 ] 供給配管 1 1は、 各タンク 3に設けられた排出配管 3 3を介して流入した ボイルオフガスを、 主機用エンジン 2へと供給している。 すなわち、 供給配 管 1 1は、 タンク 3と主機用エンジン 2とを接続している。 供給配管 1 1 に は、 上述するように、 供給配管 1 1内を流通するボイルオフガスを圧縮する 圧縮部 1 2が設けられている。 [0031] supply pipe 1 1, the boil-off gas which has flowed through the discharge pipe 3 3 provided in each tank 3, and supplied to the main machine engine 2. That is, the supply pipe 11 connects the tank 3 and the engine 2 for the main engine. As described above, the supply pipe 11 is provided with the compression unit 12 that compresses the boil-off gas flowing in the supply pipe 11.

[0032] 供給配管 1 1は、 圧縮部 1 2の下流側から発電用エンジン供給配管 1 6が 分岐している。 発電用エンジン供給配管 1 6は、 供給配管 1 1 を流通するボ イルオフガスの一部を発電用ディーゼルエンジン 5へ供給している。 また、 供給配管 1 1は、 発電用エンジン供給配管 1 6の分岐位置よりも下流側から 循環配管 1 7が分岐している。 循環配管 1 7には、 循環配管弁 1 7 3が設け られている。 循環配管弁 1 7 3は、 開度を調整することで、 循環配管 1 7内 を流通するボイルオフガスの流量を調整することができる。 なお、 循環配管 弁 1 7 3は、 全閉状態及び全開状態とすることもできる。 In the supply pipe 11, a power generation engine supply pipe 16 is branched from the downstream side of the compression section 12. The power generation engine supply pipe 16 supplies a part of the boil-off gas flowing through the supply pipe 11 to the power generation diesel engine 5. Further, the supply pipe 11 is branched from the circulation pipe 17 from the downstream side of the branch position of the power generation engine supply pipe 16. The circulation pipe 1 7, is provided circulation pipe valve 1 7 3. Circulation pipe valve 1 7 3, by adjusting the degree of opening, it is possible to adjust the flow rate of the BOG circulates in the circulation pipe 1 in 7. Incidentally, the circulating pipe valve 1 7 3 can also be a fully closed state and the fully open state.

[0033] 供給配管 1 1は、 圧縮部 1 2の上流側からボイラ供給配管 1 9が分岐して いる。 ボイラ供給配管 1 9は、 下流端がボイラ 1 5に設けられたバーナ （図 示省略） に接続されている。 ボイラ供給配管 1 9は、 供給配管 1 1 を流通す るボイルオフガスの一部をボイラ 1 5 （詳細には、 パーナ） へ供給可能に構 成されている。 ボイラ供給配管 1 9には、 第 1バルブ 1 9 3が設けられてい る。 第 1バルブ 1 9 3は、 開度を調整することで、 ボイラ供給配管 1 9内を 流通するボイルオフガスの流量を調整することができる。 なお、 第 1バルブ 1 9 3は、 全閉状態及び全開状態とすることもできる。 In the supply pipe 11, the boiler supply pipe 19 branches off from the upstream side of the compression section 12. The boiler supply pipe 19 has a downstream end connected to a burner (not shown) provided in the boiler 15. The boiler supply pipe 19 is configured to be able to supply a part of the boil-off gas flowing through the supply pipe 11 to the boiler 15 (more specifically, the planner). The boiler supply pipe 19 is provided with a first valve 193. The first valve 1 9 3, by adjusting the degree of opening, it is possible to adjust the flow rate of the BOG circulates the boiler supply pipe 1 9. The first valve 1 9 3 can be fully closed and fully open state.

[0034] 圧縮部 1 2は、 供給配管 1 1 を流通するボイルオフガスを圧縮する複数 （ 本実施形態では、 一例として 5台） の高圧用圧縮機 1 2 3を有している。 5 台の高圧用圧縮機 1 2 8は、 直列に並んで設けられている。 すなわち、 圧縮 部 1 2では多段圧縮を行っており、 これにより、 ボイルオフガスの圧力を 3

Figure imgf000010_0001
まで昇圧している。 The compression unit 12 has a plurality of (five in this embodiment as an example) high-pressure compressors 1 2 3 that compress the boil-off gas flowing through the supply pipe 11. The five high-pressure compressors 1 2 8 are arranged side by side in series. In other words, the compression section 12 performs multi-stage compression, which reduces the pressure of the boil-off gas to 3
Figure imgf000010_0001
It is boosted up to.

[0035] 高圧用圧縮機 1 2 3同士を接続する配管からは、 抽気配管 2 0が分岐して いる。 詳細には、 抽気配管 2 0は、 上流側から数えて 2台目の高圧用圧縮機 \¥02020/175077 9 卩（：171?2020/004619 [0035] An extraction pipe 20 is branched from a pipe connecting the high-pressure compressors 1 2 3 to each other. In detail, the extraction pipe 20 is the second high-pressure compressor counting from the upstream side. \¥02020/175077 9 卩(: 171?2020/004619

1 2 3と、 3台目の高圧用圧縮機 1 2 3とを接続する配管から分岐している 。 抽気配管 2 0は、 高圧用圧縮機 1 2 3同士を接続する配管内を流通するボ イルオフガスの一部を抽気し、 抽気したボイルオフガスを再液化装置 1 3へ 供給する。 抽気配管 2 0には、 抽気配管弁 2 0 3が設けられている。 抽気配 管弁 2 0 3は、 開度を調整することで、 抽気配管 2 0内を流通するボイルオ フガスの流量を調整することができる。 なお、 抽気配管弁 2 0 3は、 全閉状 態及び全開状態とすることもできる。 The pipe connecting the 1 2 3 and the third high-pressure compressor 1 2 3 branches off. Bleed pipe 2 0 is to bleed part of the ball Iruofugasu flowing through the pipe connecting the 1 2 3 between the high-pressure compressor, and supplies the extracted the BOG to the reliquefaction apparatus 1 3. The extraction pipe 2 0, is provided bleed pipe valve 2 0 3. Bleed arrangement Kanben 2 0 3, by adjusting the degree of opening, it is possible to adjust the flow rate of Boiruo Fugasu flowing the bleed pipe 2 within 0. Incidentally, the bleed pipe valve 2 0 3 can also be a full閉状state and fully open state.

[0036] 再液化装置 1 3は、 抽気配管 2 0からボイルオフガスが供給される複数 （ 本実施形態では、 一例として 3台） の液化用圧縮機 2 1 と、 液化用圧縮機 2 1で圧縮したボイルオフガスを冷却する熱交換器 2 2と、 熱交換器 2 2で冷 却したボイルオフガスの一部を膨張させる膨張タービン 2 3と、 液化用圧縮 機 2 1及び膨張夕ービン 2 3を駆動するモータ 2 4と、 を有している。 [0036] The reliquefaction device 13 is composed of a plurality of liquefaction compressors 2 1 (three units in this embodiment) to which boil-off gas is supplied from the extraction pipe 20 and a liquefaction compressor 21. Drives the heat exchanger 22 that cools the boil-off gas that has been cooled, the expansion turbine 23 that expands part of the boil-off gas that has been cooled by the heat exchanger 22, and the liquefaction compressor 21 and the expansion turbine 23. It has a motor 24 that operates.

[0037] 液化用圧縮機 2 1同士は、 配管 2 1 3によって接続されている。 また、 3 台の液化用圧縮機 2 1は、 直列に並んで設けられている。 すなわち、 3台の 液化用圧縮機 2 1は、 多段圧縮を行い、 ボイルオフガスを昇圧している。 ま た、 3台の液化用圧縮機 2 1は、 1つの駆動軸 2 5で連結されている。 この 駆動軸 2 5は、 膨張タービン 2 3及びモータ 2 4と連結しており、 モータ 2 4の駆動力によって回転駆動する。 最も下流側の液化用圧縮機 2 1から排出 されたボイルオフガスは、 第 1再液化配管 2 6を介して、 熱交換器 2 2へ供 給される。 The liquefying compressors 21 are connected to each other by pipes 2 13. Further, the three liquefying compressors 21 are arranged side by side in series. That is, the three liquefying compressors 21 perform multi-stage compression to increase the pressure of the boil-off gas. Moreover, the three liquefying compressors 21 are connected by one drive shaft 25. The drive shaft 25 is connected to the expansion turbine 23 and the motor 24, and is rotationally driven by the driving force of the motor 24. The boil-off gas discharged from the most downstream liquefaction compressor 21 is supplied to the heat exchanger 22 through the first reliquefaction pipe 26.

[0038] 熱交換器 2 2は、 液化用圧縮機 2 1で圧縮されたボイルオフガスと、 膨張 タービン 2 3で膨張したボイルオフガス及び気液分離器 1 4で分離された気 相のボイルオフガスと、 熱交換する。 液化用圧縮機 2 1で圧縮されたボイル オフガスは、 熱交換により冷却され、 _部が凝縮 （液化） し、 気液混合状態 となる。 熱交換器 2 2から排出された気液混合状態のボイルオフガス （詳細 には、 ボイルオフガスと再液化された !_ N 0とが混合した流体） は、 第 2再 液化配管 2 7を介して、 気液分離器 1 4へ供給される。 第 2再液化配管 2 7 には、 再液化配管弁 2 7 3が設けられている。 再液化配管弁 2 7 3は、 開度 \¥02020/175077 10 卩（：171?2020/004619 [0038] The heat exchanger 22 is composed of the boil-off gas compressed by the liquefaction compressor 21, the boil-off gas expanded by the expansion turbine 23 and the gas-phase boil-off gas separated by the gas-liquid separator 14 , Heat exchange. The boil-off gas compressed by the liquefying compressor 21 is cooled by heat exchange, and the _ part is condensed (liquefied) and becomes a gas-liquid mixed state. The boil-off gas in a gas-liquid mixed state discharged from the heat exchanger 22 (specifically, the fluid in which the boil-off gas and the reliquefied !_ N 0 are mixed) is passed through the second reliquefaction pipe 27. , Is supplied to the gas-liquid separator 14. The second re-liquefaction pipe 2 7, re-liquefaction pipe valve 2 7 3 are provided. Reliquefaction piping valve 2 7 3 \¥02020/175077 10 ((171?2020/004619

を調整することで、 第 2再液化配管 2 7内を流通するボイルオフガスの流量 を調整することができる。 なお、 再液化配管弁 2 7 3は、 全閉状態及び全開 状態とすることもできる。 The flow rate of the boil-off gas flowing through the second reliquefaction pipe 27 can be adjusted by adjusting the. Incidentally, reliquefaction pipe valve 2 7 3 may be fully closed and fully open state.

[0039] 熱交換器 2 2内では、 圧縮されたボイルオフガスが流通する配管から、 抽 出配管 2 8が分岐している。 抽出配管 2 8は、 ある程度熱交換を終えて冷却 されたボイルオフガスの一部を抽出し、 膨張タービン 2 3へ供給する。 [0039] In the heat exchanger 22, an extraction pipe 28 branches from a pipe through which the compressed boil-off gas flows. The extraction pipe 28 extracts part of the boil-off gas that has cooled after exchanging heat to some extent and supplies it to the expansion turbine 23.

[0040] 膨張タービン 2 3は、 駆動軸 2 5に連結されていて、 駆動軸 2 5を介して 伝達されるモータ 2 4の駆動力によって回転する。 また、 膨張夕ービン 2 3 は、 供給されたボイルオフガスを断熱膨張させ、 降温させる。 膨張タービン 2 3で膨張したボイルオフガス （以下、 「冷却源ガス」 という。 ） は、 第 1 冷却源ガス配管 2 9を介して、 熱交換器 2 2へ供給される。 熱交換器 2 2へ 供給された冷却源ガスは、 液化用圧縮機 2 1で圧縮されたボイルオフガスと 熱交換することで、 圧縮されたボイルオフガスを冷却する。 熱交換器 2 2か ら排出された冷却源ガスは、 第 2冷却源ガス配管 3 0を介して、 抽気配管 2 0へ流入する。 すなわち、 第 2冷却源ガス配管 3 0の下流端は、 抽気配管 2 0の途中位置に接続している。 詳細には、 第 2冷却源ガス配管 3 0の下流端 は、 抽気配管 2 0のうち、 抽気配管弁 2 0 3と再液化装置 1 3との間に接続 している。 The expansion turbine 23 is connected to the drive shaft 25 and is rotated by the drive force of the motor 24 transmitted via the drive shaft 25. The expansion tank 23 adiabatically expands the supplied boil-off gas to lower the temperature. The boil-off gas expanded by the expansion turbine 23 (hereinafter referred to as “cooling source gas”) is supplied to the heat exchanger 22 through the first cooling source gas pipe 29. The cooling source gas supplied to the heat exchanger 22 exchanges heat with the boil-off gas compressed by the liquefying compressor 21 to cool the compressed boil-off gas. The cooling source gas discharged from the heat exchanger 22 flows into the extraction pipe 20 through the second cooling source gas pipe 30. That is, the downstream end of the second cooling source gas pipe 30 is connected to an intermediate position of the extraction pipe 20. In detail, the downstream end of the second cooling source gas pipe 30 is connected between the extraction pipe valve 20 3 and the reliquefaction device 13 in the extraction pipe 20.

[0041 ] 気液分離器 1 4は、 ドラム状に構成されており、 供給された気液混合状態 のボイルオフガスを気相と液相 （再液化された！- N 0） とに分離する。 The gas-liquid separator 14 is configured in a drum shape, and separates the supplied boil-off gas in a gas-liquid mixed state into a gas phase and a liquid phase (reliquefied!-N 0 ).

[0042] 気液分離器 1 4の下部には、 ！_ ◦配管 3 1が接続されている。 ！_ ◦配 管 3 1は、 各タンク 3と接続されており、 気液分離器 1 4で分離された !_ ◦を各タンク 3へ供給する。 また、 ！_ 〇配管 3 1 には、 途中位置にポンプ 3 1 3が設けられており、 ポンプ 3 1 3の駆動力によって、 ！_ 〇が流通す る。 また、 ！_ 〇配管 3 1 には、 ポンプ 3 1 3をバイパスするように、 再循 環配管 3 2が設けられている。 再循環配管 3 2では、 ポンプ 3 1 3から吐出 された ◦の一部をポンプ 3 1 3の上流側の

Figure imgf000012_0001
へ循環させる ことで、 ポンプ 3 1 3内に ◦が一定の流量以下とならないようにしてい \¥02020/175077 11 卩（：171?2020/004619 [0042] At the bottom of the gas-liquid separator 14 is! _ ◦ Piping 3 1 is connected. !! _ ◦ Pipe 31 is connected to each tank 3 and supplies !_ ◦ separated by gas-liquid separator 14 to each tank 3. Also, ! _ 〇 The pipe 3 1 is provided with a pump 3 13 at an intermediate position, and by the driving force of the pump 3 13! _ 〇 will be distributed. Also, ! _ 〇 The pipe 3 1 is provided with a recirculation pipe 3 2 so as to bypass the pump 3 13. In the recirculation pipe 32, part of the ◦ discharged from the pump 3 13 is located on the upstream side of the pump 3 13.
Figure imgf000012_0001
Circulates into the pump 3 1 3 so that ◦ does not drop below a certain flow rate. \¥02020/175077 11 卩 (: 171?2020/004619

る。 再循環配管 3 2には、 再循環配管弁 3 2 3が設けられている。 再循環配 管弁 3 2 3は、 開度を調整することで、 再循環配管 3 2内を流通する 1_ 〇 の流量を調整することができる。 なお、 再循環配管弁 3 2 3は、 全閉状態及 び全開状態とすることもできる。 It The recycling line 3 2, recirculation pipe valve 3 2 3 is provided. Recirculation distribution Kanben 3 2 3, by adjusting the degree of opening, it is possible to adjust the flow rate of 1_ 〇 flowing through the recirculation pipe 3 in 2. Incidentally, the recirculation pipe valve 3 2 3 may also be in the fully closed state及beauty fully open state.

[0043] 気液分離器 1 4の上部には、 分離ガス配管 3 3が接続されている。 分離ガ ス配管 3 3は、 内部に気液分離器 1 4で分離された気相のボイルオフガス （ 以下、 「分離ガス」 という。 ） が流通しており、 分離ガスをボイラ 1 5及び 主機用エンジン 2へ導くための配管である。 分離ガス配管 3 3は、 気液分離 器 1 4とボイラ供給配管 1 9とを接続している。 すなわち、 分離ガス配管 3 3の下流端は、 ボイラ供給配管 1 9の途中位置に接続している。 詳細には、 分離ガス配管 3 3の下流端は、 第 1バルブ 1 9 3と、 ボイラ 1 5との間に接 続している。 また、 分離ガス配管 3 3の途中位置には、 熱交換器 2 2が設け られている。 熱交換器 2 2へ供給された分離ガスは、 液化用圧縮機 2 1で圧 縮されたボイルオフガスと熱交換することで、 圧縮されたボイルオフガスを 冷却する。 分離ガス配管 3 3の熱交換器 2 2よりも上流側には、 分離ガス配 管弁 3 4が設けられている。 分離ガス配管弁 3 4は、 開度を調整することで 、 分離ガス配管 3 3内を流通する分離ガスの流量を調整することができる。 なお、 分離ガス配管弁 3 4は、 全閉状態及び全開状態とすることもできる。 A separation gas pipe 33 is connected to the upper part of the gas-liquid separator 14. The separation gas pipe 33 is in the interior of which gas-phase boil-off gas separated by the gas-liquid separator 14 (hereinafter referred to as “separation gas”) flows, and the separation gas is used for the boiler 15 and the main engine. This is a pipe for leading to the engine 2. The separation gas pipe 33 connects the gas-liquid separator 14 and the boiler supply pipe 19. That is, the downstream end of the separated gas pipe 33 is connected to an intermediate position of the boiler supply pipe 19. In detail, the downstream end of the separation gas pipe 33 is connected between the first valve 193 and the boiler 15. Further, a heat exchanger 22 is provided at an intermediate position of the separation gas pipe 33. The separated gas supplied to the heat exchanger 22 exchanges heat with the boil-off gas compressed by the liquefying compressor 21 to cool the compressed boil-off gas. A separation gas pipe valve 34 is provided upstream of the heat exchanger 22 in the separation gas pipe 33. By adjusting the opening of the separation gas pipe valve 34, the flow rate of the separation gas flowing through the separation gas pipe 33 can be adjusted. The separation gas pipe valve 34 can be in a fully closed state or a fully open state.

[0044] また、 分離ガス配管 3 3には、 熱交換器 2 2の下流側に、 熱量計 3 5 （熱 量計測部） 及び第 2バルブ 3 3 3が設けられている。 熱量計 3 5は、 第 2バ ルブ 3 3 3よりも上流側に設けられている。 熱量計 3 5は、 分離ガス配管 3 3は、 供給配管 1 1の内部を流通するボイルオフガスの熱量を計測する。 熱 量計 3 5は、 計測した熱量を制御装置 5 0へ送信する。 第 2バルブ 3 3 3は 、 開度を調整することで、 分離ガス配管 3 3内を流通する分離ガスの流量を 調整することができる。 なお、 第 2バルブ 3 3 3は、 全閉状態及び全開状態 とすることもできる。 Further, in the separated gas pipe 33, a calorimeter 35 (calorific value measuring unit) and a second valve 33 3 are provided on the downstream side of the heat exchanger 22. Calorimeter 35 is provided on an upstream side of the second valves 3 3 3. The calorimeter 35 measures the calorific value of the boil-off gas flowing through the inside of the supply pipe 11 with the separation gas pipe 33. The calorimeter 35 transmits the measured calorific value to the control device 50. The second valve 3 3 3, by adjusting the degree of opening, it is possible to adjust the flow rate of the separation gas flowing through the separation gas pipe 3 3. Note that the second valve 3 3 3 may also be a fully closed state and the fully open state.

[0045] また、 分離ガス配管 3 3の途中位置からは、 分岐配管 3 6が分岐している 。 詳細には、 分離ガス配管 3 3の内、 熱量計 3 5と第 2バルブ 3 3 3との間 \¥02020/175077 12 卩（：171?2020/004619 [0045] Further, a branch pipe 36 branches from an intermediate position of the separation gas pipe 33. In particular, among the separated gas pipe 3 3, between the calorimeter 35 and the second valve 3 3 3 \¥02020/175077 12 ((171?2020/004619

から、 分岐配管 3 6が分岐している。 分岐配管 3 6は、 内部に分岐ガスが流 通し、 分離ガス配管 3 3と供給配管 1 1 とを接続している。 すなわち、 分岐 配管 3 6の下流端は、 供給配管 1 1 に接続されている。 詳細には、 分岐配管 3 6の下流端は、 供給配管 1 1のうち、 ボイラ供給配管 1 9の分岐位置より も上流側に接続している。 分岐配管 3 6には、 第 3バルブ 3 6 3が設けられ ている。 第 3バルブ 3 6 3は、 開度を調整することで、 分岐配管 3 6内を流 通するボイルオフガスの流量を調整することができる。 なお、 第 3バルブ 3 6 3は、 全閉状態及び全開状態とすることもできる。 Therefore, the branch pipe 36 is branched. The branch pipe 36 has a branch gas flowing therein, and connects the separated gas pipe 33 and the supply pipe 11 to each other. That is, the downstream end of the branch pipe 36 is connected to the supply pipe 11. Specifically, the downstream end of the branch pipe 36 is connected to the upstream side of the branch position of the boiler supply pipe 19 in the supply pipe 11. A third valve 3 63 is provided in the branch pipe 36. Third valve 3 6 3, by adjusting the degree of opening, it is possible to adjust the flow rate of the BOG to through flow branch pipe 3 6. The third valve 3 6 3 can be fully closed and fully open state.

[0046] このように、 本実施形態のボイルオフガス処理システム 4では、 分離ガス 配管 3 3及びボイラ供給配管 1 9の一部によって、 分離ガスをボイラ 1 5へ 導くことができる。 また、 分離ガス配管 3 3の一部、 分岐配管 3 6及び供給 配管 1 1の一部によって、 分離ガスを主機用エンジン 2へ導くことができる 。 また、 分離ガス配管 3 3に設けられている第 2バルブ 3 3 3及び分岐配管 3 6に設けられている第 3バルブ 3 6 3の開閉を制御することで、 分離ガス をボイラ 1 5へ導くか、 主機用エンジン 2へ導くかを切り換えることができ る。 As described above, in the boil-off gas treatment system 4 of this embodiment, the separated gas can be guided to the boiler 15 by the separated gas pipe 33 and a part of the boiler supply pipe 19. Further, the separated gas can be guided to the engine 2 for the main engine by a part of the separated gas pipe 33, a branch pipe 36 and a part of the supply pipe 11. Also, by controlling the opening and closing of the second valve 3 3 3 provided in the separation gas pipe 33 and the third valve 3 6 3 provided in the branch pipe 36, the separation gas is guided to the boiler 15. It is possible to switch between main engine 2 and main engine 2.

[0047] ボイラ 1 5は、 火炉 3 8と、 火炉 3 8内に火炎を形成するバーナ （図示省 略） と、 上方に配置された蒸気ドラム 3 9と、 下方に配置された水ドラム 4 0と、 蒸気ドラム 3 9と水ドラム 4 0とを接続する配管 （図示省略） と、 を 有している。 パーナは、 燃料油及び燃料ガスの両方を燃料可能とされている 。 パーナには、 ボイラ供給配管 1 9を介して、 ボイルオフガス又は分離ガス が供給される。 また、 パーナには、 燃料油配管 （図示省略） を介して、 燃料 油が供給される。 パーナは、 燃料油や燃焼ガス （ボイルオフガス等） もしく はその両方を燃焼させることで、 火炉 3 8内に火炎を形成する。 バーナによ って火炉 3 8内に火炎が形成されると、 ボイラ 1 5内の給水が加熱される。 給水が加熱されると、 加熱された給水が下方の水ドラム 4 0からボイラ配管 （図示省略） を介して、 上方の蒸気ドラム 3 9へと上昇する。 蒸気ドラム 3 9では、 気液が分離される。 分離された蒸気は、 ボイラ蒸気供給管 （図示省 略） を介して、 蒸気を必要とする各機器へ供給される。 蒸気ドラム 39には 、 蒸気ドラム 39内の蒸気圧力を計測する圧力計 （圧力計測部） 4 1が設け られている。 圧力計 4 1は、 計測した蒸気ドラム 39内の蒸気圧力を制御装 置 50へ送信する。 The boiler 15 includes a furnace 38, a burner (not shown) that forms a flame in the furnace 38, an upper steam drum 39, and a lower water drum 40. And a pipe (not shown) that connects the steam drum 39 and the water drum 40. PANA is capable of fueling both fuel oil and fuel gas. Boil-off gas or separation gas is supplied to the planner via a boiler supply pipe 19. Further, fuel oil is supplied to the planner through a fuel oil pipe (not shown). The burner forms a flame in the furnace 38 by burning fuel oil, combustion gas (boil-off gas, etc.) or both. When a flame is formed in the furnace 38 by the burner, the feed water in the boiler 15 is heated. When the feed water is heated, the heated feed water rises from the lower water drum 40 to the upper steam drum 39 via a boiler pipe (not shown). In the steam drum 39, gas and liquid are separated. The separated steam is supplied to the boiler steam supply pipe (not shown). Is supplied to each device that requires steam. The steam drum 39 is provided with a pressure gauge (pressure measuring unit) 41 for measuring the steam pressure in the steam drum 39. The pressure gauge 41 sends the measured steam pressure in the steam drum 39 to the control device 50.

[0048] エコノマイザ 6は、 発電用ディーゼルエンジン 5から排出された燃焼排ガ スと水とを熱交換させることで蒸気を生成する。 エコノマイザ 6と蒸気ドラ ム 39とは蒸気配管 42によって接続されている。 エコノマイザ 6で生成さ れた気液混合状態の流体は、 蒸気配管 42を介して蒸気ドラム 39へ供給さ れ、 蒸気ドラム 39で気液分離される。 蒸気ドラム 39において、 分離され た蒸気は、 ボイラ蒸気供給管 （図示省略） を介して各機器へ供給される。 ま た、 水ドラム 40とエコノマイザ 6とは、 給水配管 43によって接続されて いる。 水供給管は、 途中位置に設けられたポンプ 44によって、 水ドラム 4 0内の水をエコノマイザ 6に供給している。 [0048] The economizer 6 generates steam by exchanging heat between the combustion exhaust gas discharged from the power generation diesel engine 5 and water. The economizer 6 and the steam drum 39 are connected by a steam pipe 42. The fluid in the gas-liquid mixed state generated by the economizer 6 is supplied to the steam drum 39 via the steam pipe 42, and is separated into the gas and liquid by the steam drum 39. In the steam drum 39, the separated steam is supplied to each device through a boiler steam supply pipe (not shown). Moreover, the water drum 40 and the economizer 6 are connected by a water supply pipe 43. The water supply pipe supplies the water in the water drum 40 to the economizer 6 by means of a pump 44 provided at an intermediate position.

[0049] また、 船舶 1 には、 制御装置 50が設けられている。 Further, the boat 1 is provided with a control device 50.

制御装置 50は、 例えば、 C P U （Central Processing Unit） 、 RAM （Random Access Memory） 、 ROM （Read Only Memory） 、 及びコンピ ュータ読み取り可能な記憶媒体等から構成されている。 そして、 各種機能を 実現するための一連の処理は、 一例として、 プログラムの形式で記憶媒体等 に記憶されており、 このプログラムを C P Uが RAM等に読み出して、 情報 の加工 ·演算処理を実行することにより、 各種機能が実現される。 なお、 プ ログラムは、 ROMやその他の記憶媒体に予めインストールしておく形態や 、 コンピュータ読み取り可能な記憶媒体に記憶された状態で提供される形態 、 有線又は無線による通信手段を介して配信される形態等が適用されてもよ い。 コンピュータ読み取り可能な記憶媒体とは、 磁気ディスク、 光磁気ディ スク、 CD-ROM, DVD-ROM, 半導体メモリ等である。 The control device 50 includes, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), a computer-readable storage medium, and the like. A series of processes for realizing various functions are stored in a storage medium or the like in the form of a program as an example, and the CPU reads the program into RAM or the like to execute the information processing/arithmetic processing. By doing so, various functions are realized. The program is installed in advance in a ROM or other storage medium, provided in a state of being stored in a computer-readable storage medium, or distributed via wired or wireless communication means. The form etc. may be applied. Computer-readable storage media include magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, semiconductor memories, and the like.

[0050] 制御装置 50は、 ボイルオフガス処理システム 4に設けられた各弁 （第 1 バルブ 1 9 aから第 3バルブ 36 aを含む） の開度を 0 %から 1 00%の間 で制御可能とされている。 制御装置 50は、 図 2に示すように、 熱量計 35 \¥02020/175077 14 卩（：171?2020/004619 [0050] The control device 50 can control the opening degree of each valve (including the first valve 19a to the third valve 36a) provided in the boil-off gas treatment system 4 from 0% to 100%. It is said that. As shown in Fig. 2, the controller 50 controls the calorimeter 35 \¥02020/175077 14 卩 (: 171?2020/004619

が計測した熱量に基づいて分離ガスの供給先を決定する決定部 5 1 と、 決定 部 5 1が決定した供給先へ分離ガスが供給されるように第 2バルブ 3 3 3及 び第 3バルブ 3 6 3を制御する切換制御部 5 2と、 所定の閾値を記憶してい る記憶部 5 3と、 を有している。 記憶部 5 3が記憶する所定の閾値とは、 例 えば、 主機用エンジン 2が、 好適に燃焼を行うことができる燃料の熱量の下 限値が挙げられる。 Determination unit 51 that determines the supply destination of the separation gas based on the amount of heat measured by and the second valve 3 3 3 and the third valve so that the separation gas is supplied to the supply destination determined by the determination unit 5 1. A switching control unit 52 for controlling the control unit 3 6 and a storage unit 5 3 for storing a predetermined threshold value are provided. The predetermined threshold value stored in the storage unit 53 includes, for example, a lower limit value of the heat quantity of the fuel with which the engine 2 for the main engine can suitably burn.

決定部 5 1は、 分離ガスの熱量 （熱量計 3 5で計測した熱量） が、 記憶部 5 3が記憶している所定の閾値以上の場合に、 分離ガスの供給先を主機用エ ンジン 2に決定し、 所定の閾値よりも少ない場合に、 分離ガスの供給先をボ イラ 1 5に決定する。 When the calorific value of the separated gas (the calorific value measured by the calorimeter 35) is equal to or higher than the predetermined threshold value stored in the storage section 53, the determining unit 51 determines that the separated gas is supplied to the engine for the main engine. If it is less than the predetermined threshold, the separation gas supply destination is determined to be the boiler 15.

[0051 ] 切換制御部 5 2は、 決定部 5 1が分離ガスの供給先を主機用エンジン 2に 決定すると、 分離ガス配管 3 3に設けられている第 2バルブ 3 3 3を全閉状 態 （開度〇%の状態） とするとともに、 分岐配管 3 6に設けられている第 3 バルブ 3 6 3を全開状態 （開度 1 0 0 %の状態） とする。 また、 このとき、 ボイラ供給配管 1 9に設けられた第 1バルブ 1 9 3を全閉状態とする。 切換制御部 5 2は、 決定部 5 1が分離ガスの供給先をボイラ 1 5に決定す ると、 分離ガス配管 3 3に設けられている第 2バルブ 3 3 3を全開状態とす るとともに、 分岐配管 3 6に設けられている第 3バルブ 3 6 3を全閉状態と する。 また、 このとき、 ボイラ供給配管 1 9に設けられた第 1バルブ 1 9 3 を全閉状態とする。 [0051] When the determination unit 51 determines that the separated gas supply destination is the engine 2 for the main engine, the switching control unit 52 completely closes the second valve 333 provided in the separated gas pipe 33. with the opening 10 percent of the state), the third valve 3 6 3 provided in the branch pipe 3 6 fully opened (opening 1 0 0% state). At this time, the first valve 1 9 3 provided in the boiler feed pipe 1 9 fully closed state. When the determining unit 51 determines that the separated gas supply destination is the boiler 15, the switching control unit 52 fully opens the second valve 3 33 provided in the separated gas pipe 33. , Fully close the third valve 3 6 3 provided on the branch pipe 36. At this time, the first valve 193 provided on the boiler supply pipe 19 is fully closed.

[0052] 次に、 本実施形態に係るボイルオフガスの処理方法及びボイルオフガスの 流れについて図 1 を用いて説明する。 Next, the boil-off gas processing method and boil-off gas flow according to the present embodiment will be described with reference to FIG.

各タンク 3で発生したボイルオフガスは、 各タンク 3内の圧力が所定の圧 力を超えると、 排出配管 3 3を介して供給配管 1 1 に流入する。 供給配管 1 1 に流入したボイルオフガスは、 供給配管 1 1内を流通する。 このとき、 ボ イラ供給配管 1 9の第 1バルブ 1 9 3が開状態の場合には、 ボイルオフガス の一部がボイラ供給配管 1 9へ流入する。 ボイラ供給配管 1 9へ流入したボ イルオフガスは、 ボイラ 1 5へ供給され、 燃料として燃焼される。 \¥02020/175077 15 卩（：171?2020/004619 BOG generated in each tank 3, the pressure in each tank 3 exceeds a predetermined pressure, to flow into the supply pipe 1 1 through the discharge pipe 3 3. The boil-off gas flowing into the supply pipe 11 flows in the supply pipe 11. At this time, if the first valve 193 of the boiler supply pipe 19 is open, part of the boil-off gas flows into the boiler supply pipe 19. The boil-off gas flowing into the boiler supply pipe 19 is supplied to the boiler 15 and burned as fuel. \¥02020/175077 15 卩 (: 171?2020/004619

[0053] 一方、 ボイラ供給配管 1 9へ流入しなかったボイルオフガスは、 供給配管 [0053] On the other hand, the boil-off gas that did not flow into the boiler supply pipe 19 was

1 1内を流通し、 圧縮部 1 2で圧縮される。 圧縮部 1 2で圧縮されたボイル オフガスは、 供給配管 1 1内を流通し、 主機用エンジン 2へ供給され、 燃料 として燃焼される。 圧縮部 1 2で圧縮されたボイルオフガスの一部は、 発電 用エンジン供給配管 1 6へ流入し、 発電用エンジンへ供給される。 また、 主 機用エンジン 2でボイルオフガスを必要としていない場合には、 循環配管 1 7に設けられた循環配管弁 1 7 3を開状態とし、 ボイルオフガスを、 循環配 管 1 7を介して供給配管 1 1へ戻す。 It circulates in 11 and is compressed in compression section 12. The boil-off gas compressed in the compression section 12 flows through the supply pipe 11 and is supplied to the engine 2 for the main engine and burned as fuel. A part of the boil-off gas compressed in the compression section 12 flows into the power generation engine supply pipe 16 and is supplied to the power generation engine. Also, if not require BOG main machine engine 2, a circulation pipe valve 1 7 3 provided in the circulation pipe 1 7 to the open state, the boil-off gas, through the circulation piping 1 7 supply Return to piping 1 1.

[0054] ボイルオフガスを再液化する際には、 抽気配管 2 0に設けられた抽気配管 弁 2 0 3を開状態とする。 これにより、 圧縮部 1 2で所定の圧力まで圧縮さ れたボイルオフガスが、 抽気配管 2 0を介して再液化装置 1 3へ供給される 。 再液化装置 1 3では、 ボイルオフガスが 3台の液化用圧縮機 2 1で圧縮さ れる。 圧縮されたボイルオフガスは、 第 1再液化配管 2 6を介して熱交換器 2 2に供給される。 熱交換器 2 2では、 ボイルオフガスと、 冷却源ガス及び 分離ガスとが熱交換する。 これにより、 ボイルオフガスは、 冷却され一部が 凝縮 （液化） し、 気液混合状態となる。 熱交換器 2 2から排出された気液混 合状態のボイルオフガス （詳細には、 ボイルオフガスと再液化された !_ ◦ とが混合した流体） は、 第 2再液化配管 2 7を介して、 気液分離器 1 4へ供 給される。 When re-liquefy the [0054] off gas will bleed pipe valve 2 0 3 provided in the extraction pipe 2 0 opened. As a result, the boil-off gas compressed to a predetermined pressure in the compression section 12 is supplied to the reliquefaction apparatus 13 via the extraction pipe 20. In the reliquefaction unit 13 the boil-off gas is compressed by three liquefaction compressors 21. The compressed boil-off gas is supplied to the heat exchanger 22 via the first reliquefaction pipe 26. In the heat exchanger 22, the boil-off gas exchanges heat with the cooling source gas and the separation gas. As a result, the boil-off gas is cooled and part of it is condensed (liquefied), and becomes a gas-liquid mixed state. The boil-off gas in a gas-liquid mixed state discharged from the heat exchanger 22 (specifically, the fluid in which the boil-off gas and the reliquefied !_ ◦ are mixed) is passed through the second reliquefaction pipe 27. , Is supplied to the gas-liquid separator 14.

[0055] 気液分離器 1 4では、 気液混合状態のボイルオフガスを気相 （分離ガス） と液相 （再液化された!- N 0） とに分離する。 なお、 ボイルオフガスには窒 素が含まれているが、 窒素は他の成分 （メタン等） と比較して液化し難いた め、 気液分離された気相 （分離ガス） は窒素含有量が多い気体となる。 再液化された

Figure imgf000017_0001
を介して、 各タンク 3へ導かれる 。 このようにして、 ボイルオフガスは再液化され、 タンク 3へ戻される。 一 方、 分離ガスは、 分離ガス配管 3 3を介して熱交換器 2 2へ供給される。 熱 交換器 2 2で熱交換を終えた分離ガスは、 分離ガス配管 3 3内を流通する。 分離ガス配管 3 3内を流通する分離ガスは、 供給先がボイラ 1 5である場合 （すなわち、 第 2バルブ 3 3 aが開状態であって、 第 3バルブ 3 6 aが閉状 態の場合） には、 ボイラ供給配管 1 9を介して、 ボイラ 1 5へ供給され、 燃 料として燃焼される。 供給先が主機用エンジン 2である場合 （すなわち、 第 2バルブ 3 3 aが閉状態であって、 第 3バルブ 3 6 aが開状態の場合） には 、 分岐配管 3 6を介して、 供給配管 1 1 に流入する。 供給配管 1 1 に流入す ると、 圧縮部 1 2等を介して主機用エンジン 2へ導かれる。 In the gas-liquid separator 14, the boil-off gas in a gas-liquid mixed state is separated into a gas phase (separated gas) and a liquid phase (reliquefied !-N 0 ). Although boil-off gas contains nitrogen, it is difficult to liquefy nitrogen as compared with other components (such as methane), so the gas phase separated gas (separated gas) has a nitrogen content. It becomes a large amount of gas. Reliquefied
Figure imgf000017_0001
It is led to each tank 3 via. In this way, the boil-off gas is reliquefied and returned to tank 3. On the other hand, the separated gas is supplied to the heat exchanger 22 through the separated gas pipe 33. The separated gas that has completed heat exchange in the heat exchanger 22 flows through the separated gas pipe 33. When the supply destination of the separated gas flowing in the separated gas pipe 33 is the boiler 15 (That is, when the second valve 33a is open and the third valve 36a is closed), it is supplied to the boiler 15 through the boiler supply pipe 19 and is used as fuel. Burned. When the supply destination is the engine 2 for the main engine (that is, when the second valve 33a is closed and the third valve 36a is open), supply it via the branch pipe 36. Inflow to pipe 1 1. When it flows into the supply pipe 11, it is guided to the engine 2 for the main engine through the compression unit 12 and the like.

[0056] 本実施形態によれば、 以下の作用効果を奏する。 [0056] According to the present embodiment, the following operational effects are exhibited.

本実施形態では、 気液分離器 1 4で分離された分離ガスを、 主機用エンジ ン 2とボイラ 1 5との何れにも導くことができる。 したがって、 分離ガスを 、 燃焼処理できるとともに、 主機用エンジン 2及び/またはボイラ 1 5で燃 料として利用することができる。 よって、 分離ガスを利用しない構成 （分離 ガスを G C U （Gas Combust i on Un i t） 等で燃焼処理する構成） と比較して 、 システム全体のエネルギ効率を向上させることができる。 In the present embodiment, the separated gas separated by the gas-liquid separator 14 can be introduced to both the engine 2 for the main engine and the boiler 15. Therefore, the separated gas can be burned and used as fuel in the engine 2 for the main engine and/or the boiler 15. Therefore, it is possible to improve the energy efficiency of the entire system, as compared with the configuration in which the separated gas is not used (the configuration in which the separated gas is burned by GCU (Gas Combustion on Unit) or the like).

[0057] また、 第 2バルブ 3 3 a及び第 3バルブ 3 6 aによって、 分離ガスを主機 用エンジン 2へ導くか、 ボイラ 1 5へ導くかを切り換えることができる。 こ れにより、 分離ガスを、 主機用エンジン 2及びボイラ 1 5のいずれかの装置 のうち、 所望の装置へ導くことができる。 したがって、 例えば、 主機用エン ジン 2及びボイラ 1 5の運転状態や、 分離ガスの成分等に応じた供給先へ分 離ガスを導くことができる。 よって、 主機用エンジン 2及びボイラ 1 5で好 適に分離ガスを燃焼させることができる。 Further, the second valve 33a and the third valve 36a can be used to switch whether the separated gas is introduced to the main engine 2 or the boiler 15. As a result, the separated gas can be guided to a desired device of either the main engine 2 or the boiler 15 device. Therefore, for example, the separated gas can be guided to the supply destination according to the operating conditions of the engine 2 for the main engine and the boiler 15 and the components of the separated gas. Therefore, the separated gas can be appropriately burned in the main engine 2 and the boiler 15.

[0058] 上述のように、 窒素は液化にしにくいため、 分離ガスは、 窒素含有量が大 きくなる傾向にある。 したがって、 窒素含有量が大きいガスは、 熱量が低く なるとともに、 主機用エンジン 2で好適に燃焼させることができない場合が ある。 [0058] As described above, since nitrogen is difficult to liquefy, the separation gas tends to have a large nitrogen content. Therefore, the gas having a large nitrogen content has a low heat amount and may not be appropriately combusted in the engine 2 for the main engine.

本実施形態では、 熱量計 3 5で分離ガスの熱量を計測し、 計測した熱量に 基づいて供給先を決定している。 これにより、 分離ガスの供給先を、 熱量の 観点から適切な供給先とすることができる。 In the present embodiment, the calorimeter 35 measures the calorific value of the separated gas, and the supply destination is determined based on the measured calorific value. As a result, the separation gas supply destination can be an appropriate supply destination from the viewpoint of the amount of heat.

[0059] 詳細には、 本実施形態では、 分離ガスの熱量 （熱量計 3 5で計測した熱量 ） が、 記憶部 5 3が記憶する所定の閾値よりも多い場合に、 分離ガスの供給 先を主機用エンジン 2に決定している。 これにより、 分離ガスの熱量が多く 、 主機用エンジン 2で分離ガスを好適に燃焼させることができる場合には、 分離ガスを主機用エンジン 2へ導いて好適に燃焼させることができる。 Specifically, in the present embodiment, the heat quantity of the separated gas (the heat quantity measured by the calorimeter 35 is ) Is larger than the predetermined threshold value stored in the storage unit 53, the supply destination of the separated gas is determined to be the engine 2 for the main engine. As a result, when the separated gas has a large amount of heat and the separated gas can be suitably burned in the main engine 2, the separated gas can be guided to the main engine 2 and burned appropriately.

一方、 分離ガスの熱量が小さく、 主機用エンジン 2で分離ガスを好適に燃 焼させることができない場合 （換言すれば、 分離ガスの熱量が、 記憶部 5 3 が記憶する所定の閾値よりも少ない場合） には、 分離ガスをボイラ 1 5に導 くことで、 分離ガスを燃焼処理することができるとともに、 燃焼処理に伴っ て生じたエネルギを蒸気の生成に利用することができる。 On the other hand, when the amount of heat of the separated gas is so small that the separated gas cannot be suitably burned by the engine 2 for the main engine (in other words, the amount of heat of the separated gas is less than the predetermined threshold value stored in the storage unit 53). In this case, by guiding the separated gas to the boiler 15, the separated gas can be burned and the energy generated by the burning process can be used for generating steam.

このように、 本実施形態では、 熱量に応じた供給先へ分離ガスを導くこと ができる。 また、 何れの供給先へ分離ガスを供給した場合であっても、 燃焼 で生じるエネルギを利用することができるので、 エネルギ効率を向上させる ことができる。 Thus, in this embodiment, the separated gas can be guided to the supply destination according to the amount of heat. Further, no matter which supply destination the separation gas is supplied to, the energy generated by the combustion can be utilized, so that the energy efficiency can be improved.

[0060] また、 主機用エンジン 2で好適に燃焼させることができない分離ガスを燃 焼処理するためだけに用いられる G C U （Gas Combust i on Un i t） 等の燃焼 処理装置を設けることも考えらえる。 しかしながら、 船舶 1は、 船内で使用 する蒸気を生成する必要がある場合には、 船内で使用する蒸気を生成するた めのボイラを設けることがある。 このような場合に、 燃焼処理装置を設けた 構成では、 船舶 1 に燃焼処理装置及びボイラの両方を設ける必要がある。 一 方、 本実施形態では、 主機用エンジン 2で好適に燃焼させることができない 分離ガスをボイラ 1 5で燃焼させるとともに、 蒸気を生成することができる 。 これにより、 燃焼処理装置を設けない構成とすることができる。 したがっ て、 燃焼処理装置を設ける構成と比較して、 構成を簡素化することができる [0060] Further, it is conceivable to provide a combustion processing device such as a GCU (Gas Combustion on Unit) used only for burning the separated gas that cannot be suitably combusted in the main engine 2. .. However, Vessel 1 may be equipped with a boiler to generate steam for use onboard when it is necessary to generate steam for use onboard. In such a case, in the configuration provided with the combustion treatment device, it is necessary to provide both the combustion treatment device and the boiler in the ship 1. On the other hand, in the present embodiment, the separated gas that cannot be suitably burned in the main engine 2 can be burned in the boiler 15 and the steam can be generated. As a result, the combustion processing device can be omitted. Therefore, the structure can be simplified as compared with the structure in which the combustion processing device is provided.

[0061 ] 〔変形例〕 [0061] [Modification]

次に、 本実施形態の変形例について説明する。 Next, a modified example of the present embodiment will be described.

本変形例では、 熱量計 3 5の代わりに、 分離ガス配管 3 3に分離ガスの窒 素含有量を計測する窒素含有量計測機 （窒素含有量計測部） を設けられてい \¥02020/175077 18 卩（：171?2020/004619 In this modification, instead of the calorimeter 35, the separation gas pipe 33 is provided with a nitrogen content measuring device (nitrogen content measuring unit) for measuring the nitrogen content of the separation gas. \¥02020/175077 18 卩 (: 171?2020/004619

る点、 及び、 記憶部 5 3が所定の閾値として、 主機用エンジン 2が、 好適に 燃焼させることができる燃料の窒素含有量の上限値を記憶している点で、 上 記実施形態と異なる。 また、 分離ガスの窒素含有量が所定の閾値よりも少な い場合に、 決定部 5 1が分離ガスの供給先を主機用エンジン 2に決定してい る点で上記実施形態と異なっている。 And that the storage unit 53 stores the upper limit value of the nitrogen content of the fuel that can be suitably burned by the engine 2 for the main engine as a predetermined threshold value, which is different from the above embodiment. .. In addition, the determination unit 51 determines the supply destination of the separation gas to the engine 2 for the main engine when the nitrogen content of the separation gas is less than a predetermined threshold value, which is a difference from the above embodiment.

[0062] 本変形例によれば、 分離ガスの供給先を、 窒素含有量の観点から適切な供 給先とすることができる。 詳細には、 本変形例では、 分離ガスの窒素含有量 が、 記憶部 5 3が記憶する所定の閾値よりも多い場合に、 分離ガスの供給先 をボイラ 1 5に決定している。 これにより、 分離ガスの窒素含有量が多く、 主機用エンジン 2で分離ガスを好適に燃焼させることができない場合には、 分離ガスをボイラ 1 5で好適に燃焼させることができる。 また、 分離ガスの 窒素含有量が、 記憶部 5 3が記憶する所定の閾値よりも少ない場合に、 分離 ガスの供給先を主機用エンジン 2に決定している。 これにより、 分離ガスの 窒素含有量が少なく、 主機用エンジン 2で分離ガスを好適に燃焼させること ができる場合には、 分離ガスを主機用エンジン 2で好適に燃焼させることが できる。 According to this modification, the separation gas supply destination can be an appropriate supply destination from the viewpoint of the nitrogen content. Specifically, in this modification, when the nitrogen content of the separated gas is higher than a predetermined threshold value stored in the storage unit 53, the supply destination of the separated gas is determined to be the boiler 15. As a result, when the separated gas has a large nitrogen content and the separated gas cannot be suitably burned in the engine 2 for the main engine, the separated gas can be suitably burned in the boiler 15. Further, when the nitrogen content of the separated gas is less than the predetermined threshold value stored in the storage unit 53, the supply destination of the separated gas is determined to be the engine 2 for the main engine. As a result, when the separated gas has a low nitrogen content and the separated gas can be suitably burned in the main engine 2, the separated gas can be preferably burned in the main engine 2.

[0063] 上述のように、 窒素は液化にしにくく、 分離ガスは窒素含有量が大きくな る傾向にあるため、 窒素含有量の観点から供給先を決定することで、 より直 接的に分離ガスの成分に応じた供給先へ分離ガスを供給することができる。 したがって、 分離ガスの供給先を、 窒素含有量の観点からより適切な供給先 とすることができる。 [0063] As described above, nitrogen is difficult to liquefy, and the separation gas tends to have a large nitrogen content. Therefore, by determining the supply destination from the viewpoint of the nitrogen content, the separation gas can be more directly connected. The separation gas can be supplied to the supply destination according to the component of. Therefore, the separation gas supply destination can be a more appropriate supply destination from the viewpoint of the nitrogen content.

[0064] なお、 本発明は、 上記実施形態に限定されるものではなく、 その要旨を逸 脱しない範囲において、 適宜変形が可能である。 The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit of the invention.

[0065] 例えば、 エコノマイザ 6で蒸気を生成するだけではなく、 ボイラ 1 5の火 炉 3 8で火炎を形成し、 ボイラ 1 5でも蒸気を生成する場合 （すなわち、 ボ イラ 1 5で追い焚きを行う場合） に、 ボイラ 1 5の蒸気ドラム 3 9内の蒸気 圧力を計測する圧力計 4 1の計測結果に基づいて、 分離ガスの供給先を決定 してもよい。 詳細には、 決定部 5 1は、 圧力計 4 1が計測した圧力が、 所定 \¥02020/175077 19 卩（：171?2020/004619 [0065] For example, when not only the steam is generated by the economizer 6 but also the flame is formed by the furnace 38 of the boiler 15 and the steam is also generated by the boiler 15 (that is, the boiler 15 reheats the fuel). When performing), the supply destination of the separated gas may be determined based on the measurement result of the pressure gauge 41 that measures the steam pressure in the steam drum 39 of the boiler 15. In detail, the determination unit 51 determines that the pressure measured by the pressure gauge 41 is a predetermined value. \¥02020/175077 19 卩 (: 171?2020/004619

の閾値よりも低い場合に、 分離ガスの供給先をボイラ 1 5に決定してもよい 。 所定の閾値とは、 例えば、 船内で要求される蒸気量を賄うことができると されている設定値が挙げられる。 また、 所定の閾値ではなく、 船内で要求さ れている蒸気量を逐次取得し、 要求蒸気量に応じた圧力よりも低い場合に、 分離ガスの供給先をボイラ 1 5に決定してもよい。 When it is lower than the threshold value of 1, the separation gas supply destination may be determined to be the boiler 15. The predetermined threshold value is, for example, a set value which is said to be able to cover the amount of steam required onboard the ship. Also, instead of a predetermined threshold value, the amount of steam required onboard the ship may be sequentially acquired, and if the pressure is lower than the required amount of steam, the supply destination of the separated gas may be determined as the boiler 15 ..

[0066] このように構成することで、 ボイラ 1 5内において好適に蒸気が生成され ていない場合に、 分離ガスをボイラ 1 5へ導くことができる。 したがって、 ボイラ 1 5において好適に安定的に蒸気を生成することができる。 With such a configuration, the separated gas can be guided to the boiler 15 when the steam is not appropriately generated in the boiler 15. Therefore, it is possible to preferably stably generate steam in the boiler 15.

[0067] また、 ボイラ 1 5で追い焚きを行う場合に、 分離ガスの供給先をボイラ 1 [0067] When the boiler 15 is used for reheating, the separation gas supply destination is the boiler 1

5に決定してもよい。 換言すれば、 ボイラ 1 5の追い焚き時には、 ボイラ 1 5の燃料として、 燃料油配管 （図示省略） を介して供給される燃料油及びボ イラ供給配管 1 9を介して供給されるボイルオフガスよりも、 優先的に分離 ガスを用いるようにしてもよい。 You may decide to 5. In other words, at the time of reheating the boiler 15, as fuel for the boiler 15, fuel oil supplied through a fuel oil pipe (not shown) and boil-off gas supplied through the boiler supply pipe 19 are used. Alternatively, the separated gas may be preferentially used.

このように構成することで、 火炎を形成するための他の燃料 （燃料油やボ イラ供給配管 1 9を介して供給されるボイルオフガス） の使用量を低減する ことができる。 With this configuration, it is possible to reduce the amount of other fuel (fuel oil or boil-off gas supplied through the boiler supply pipe 19) for forming the flame.

[0068] また、 上記実施形態では、 制御装置 5 0によって、 第 1バルブ 1 9 3から 第 3バルブ 3 6 3を操作する例について説明したが、 本発明はこれに限定さ れない。 例えば、 オペレータの操作によって、 第 1バルブ 1 9 3から第 3バ ルブ 3 6 3の開閉状態を切り換えてもよい。 符号の説明 Further, in the above embodiment, an example in which the control device 50 operates the first valve 193 to the third valve 363 is described, but the present invention is not limited to this. For example, the opening/closing state of the first valve 193 to the third valve 363 may be switched by an operator's operation. Explanation of symbols

[0069] 1 :船舶 [0069] 1: Ship

2 :主機用エンジン 2: Engine for main engine

3 :タンク 3: Tank

3 3 :排出配管 3 3: Discharge pipe

4 :ボイルオフガス処理システム 4: Boil-off gas treatment system

5 :発電用ディーゼルエンジン 5: Diesel engine for power generation

6 : エコノマイザ \¥02020/175077 20 卩（：171?2020/004619 6: Economizer \¥02020/175077 20 boxes (: 171-12020/004619

1 1 :供給配管 1 1: Supply piping

1 2 :圧縮部 1 2 :Compression section

1 23, :高圧用圧縮機 1 23,: High pressure compressor

1 3 :再液化装置 1 3 :Reliquefaction device

1 4 :気液分離器 1 4: Gas-liquid separator

1 5 :ボイラ 1 5: Boiler

1 6 :発電用エンジン供給配管 1 6 :Power generation engine supply pipe

1 7 :循環配管 1 7: Circulation piping

1 73 :循環配管弁 1 73: Circulation piping valve

1 9 :ボイラ供給配管 1 9: Boiler supply piping

1 93 :第 1バルブ 1 93: 1st valve

20 :抽気配管 20: Bleed pipe

203 :抽気配管弁 203: Bleed pipe valve

2 1 :液化用圧縮機 21: Compressor for liquefaction

2 1 3 :配管 2 1 3 :Piping

22 :熱交換器 22: Heat exchanger

23 :膨張夕ービン 23: Inflatable evening

24 :モータ 24: Motor

25 :駆動軸 25: Drive axis

26 :第 1再液化配管 26: 1st reliquefaction pipe

27 :第 2再液化配管 27: Second reliquefaction pipe

273 :再液化配管弁 273: Reliquefaction piping valve

28 :抽出配管 28: Extraction piping

29 :第 1冷却源ガス配管 29: 1st cooling source gas pipe

30 :第 2冷却源ガス配管 30: Second cooling source gas pipe

Figure imgf000022_0001
Figure imgf000022_0001

3 1 3 :ポンプ 3 1 3 :Pump

32 :再循環配管 \¥02020/175077 21 卩（：171? 2020 /004619 32: Recirculation piping \¥02020/175077 21 卩(: 171? 2020/004619

323 :再循環配管弁 323: Recirculation piping valve

33 :分離ガス配管 33: Separation gas piping

333 :第 2バルブ 333: Second valve

34 :分離ガス配管弁 34: Separation gas piping valve

35 :熱量計 35: Calorimeter

36 :分岐配管 36: Branch piping

363 :第 3バルブ 363: 3rd valve

38 :火炉 38: furnace

39 :蒸気ドラム 39: Steam drum

40 :水ドラム 40: Water drum

4 1 :圧力計 4 1: Pressure gauge

42 :蒸気配管 42: Steam piping

43 :給水配管 43: Water supply piping

44 :ポンプ 44: Pump

50 :制御装置 50: Control device

5 1 :決定部 5 1: Determiner

52 :切換制御部 52: Switching control unit

Claims

\¥0 2020/175077 22 卩（：17 2020 /004619 請求の範囲 \¥0 2020/175077 22 卩(: 17 2020/004619 Claims [請求項 1 ] 液化ガスが貯留されているタンクで発生したボイルオフガスを燃焼 可能であって、 蒸気を生成するボイラと、 [Claim 1] A boiler capable of combusting a boil-off gas generated in a tank storing liquefied gas and generating steam, 前記タンクで発生したボイルオフガスに対して液化処理を行う再液 化装置と、 A reliquefaction device for liquefying the boil-off gas generated in the tank, 前記再液化装置で液化処理が行なわれた気液混合状態のボイルオフ ガスを気相と液相とに分離する分離部と、 A separation unit for separating the boil-off gas in a gas-liquid mixed state, which has been liquefied by the reliquefaction device, into a gas phase and a liquid phase; 前記分離部で分離された気相のボイルオフガスを、 ボイルオフガス を燃焼可能である主機用内燃機関へ導く第 1配管と、 前記分離部で分離された気相のボイルオフガスを前記ボイラへ導く 第 2配管と、 A first pipe for guiding the gas-phase boil-off gas separated by the separation unit to a main engine internal combustion engine capable of burning the boil-off gas; and a gas-phase boil-off gas separated by the separation unit for guiding to the boiler. 2 pipes, 前記分離部で分離された気相のボイルオフガスを前記主機用内燃機 関へ導くか、 前記ボイラへ導くかを切り換える切換部と、 を備えたボ イルオフガス処理システム。 A boil-off gas treatment system comprising: a switching unit that switches between introducing the gas-phase boil-off gas separated by the separating unit to the internal combustion engine for the main engine or to the boiler. [請求項 2] 前記分離部で分離された気相のボイルオフガスの窒素含有量を計測 する窒素含有量計測部と、 [Claim 2] A nitrogen content measuring unit for measuring the nitrogen content of the gas phase boil-off gas separated by the separation unit, 前記窒素含有量計測部が計測した窒素含有量に基づいて、 前記分離 部で分離された気相のボイルオフガスの供給先を決定する決定部と、 前記分離部で分離された気相のボイルオフガスが、 前記決定部が決 定した供給先へ供給されるように前記切換部を制御する切換制御部と 、 を備える請求項 1 に記載のボイルオフガス処理システム。 Based on the nitrogen content measured by the nitrogen content measuring unit, a determining unit that determines a supply destination of the vapor phase boil-off gas separated by the separating unit, and a vapor phase boil-off gas separated by the separating unit. 2. The boil-off gas treatment system according to claim 1, further comprising: a switching control unit that controls the switching unit so that the determination unit supplies the determined destination. [請求項 3] 前記分離部で分離された気相のボイルオフガスの熱量を計測する熱 量計測部と、 [Claim 3] A heat quantity measuring unit for measuring the heat quantity of the gas-phase boil-off gas separated by the separation unit, 前記熱量計測部が計測した熱量に基づいて、 前記分離部で分離され た気相のボイルオフガスの供給先を決定する決定部と、 A determination unit that determines the supply destination of the gas-phase boil-off gas separated by the separation unit, based on the heat amount measured by the heat amount measurement unit; 前記分離部で分離された気相のボイルオフガスが、 前記決定部が決 定した供給先へ供給されるように前記切換部を制御する切換制御部と 、 を備えた請求項 1 に記載のボイルオフガス処理システム。 \¥02020/175077 23 卩（：171?2020/004619 The boil-off according to claim 1, further comprising: a switching control unit that controls the switching unit so that the gas-phase boil-off gas separated by the separation unit is supplied to the supply destination determined by the determination unit. Gas treatment system. \¥02020/175077 23 卩 (: 171?2020/004619 [請求項 4] 前記ボイラの圧力を計測する圧力計測部と、 [Claim 4] A pressure measuring unit for measuring the pressure of the boiler, 前記ボイラにおいて火炎を形成する場合に、 前記圧力計測部が計測 した圧力に基づいて、 前記分離部で分離された気相のボイルオフガス の供給先を決定する決定部と、 When forming a flame in the boiler, based on the pressure measured by the pressure measurement unit, a determination unit that determines the supply destination of the gas-phase boil-off gas separated by the separation unit, 前記決定部が決定した供給先へボイルオフガスが供給されるように 前記切換部を制御する切換制御部と、 を備え、 A switching control unit that controls the switching unit so that the boil-off gas is supplied to the supply destination determined by the determination unit; 前記決定部は、 前記圧力計測部が計測した圧力が、 所定の閾値より も低い場合に、 前記分離部で分離された気相のボイルオフガスの供給 先を前記ボイラに決定する請求項 1 に記載のボイルオフガス処理シス テム。 The determination unit determines to the boiler the supply destination of the gas-phase boil-off gas separated by the separation unit when the pressure measured by the pressure measurement unit is lower than a predetermined threshold value. Boil-off gas treatment system. [請求項 5] 前記分離部で分離された気相のボイルオフガスの供給先を決定する 決定部と、 [Claim 5] A determination unit that determines a supply destination of the gas-phase boil-off gas separated by the separation unit, 前記決定部が決定した供給先へボイルオフガスが供給されるように 前記切換部を制御する切換制御部と、 を備え、 A switching control unit that controls the switching unit so that the boil-off gas is supplied to the supply destination determined by the determination unit; 前記決定部は、 前記ボイラにおいて火炎を形成する場合に、 前記分 離部で分離された気相のボイルオフガスの供給先を前記ボイラに決定 する請求項 1 に記載のボイルオフガス処理システム。 The boil-off gas treatment system according to claim 1, wherein the determining unit determines the supply destination of the gas-phase boil-off gas separated by the separating unit to the boiler when a flame is formed in the boiler. [請求項 6] 請求項 1から請求項 5のいずれかに記載のボイルオフガス処理シス テムを備えた船舶。 [Claim 6] A ship provided with the boil-off gas treatment system according to any one of claims 1 to 5.
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