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WO2018174364A1 - Boil-off gas reliquefaction system and method for vessel - Google Patents

Boil-off gas reliquefaction system and method for vessel Download PDF

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Publication number
WO2018174364A1
WO2018174364A1 PCT/KR2017/012577 KR2017012577W WO2018174364A1 WO 2018174364 A1 WO2018174364 A1 WO 2018174364A1 KR 2017012577 W KR2017012577 W KR 2017012577W WO 2018174364 A1 WO2018174364 A1 WO 2018174364A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
boil
compressor
heat exchanger
refrigerant
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/KR2017/012577
Other languages
French (fr)
Korean (ko)
Inventor
ํ™ฉ์ˆœ๊ทœ
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.)
Hanwha Ocean Co Ltd
Original Assignee
Daewoo Shipbuilding and Marine Engineering 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 Daewoo Shipbuilding and Marine Engineering Co Ltd filed Critical Daewoo Shipbuilding and Marine Engineering Co Ltd
Priority to JP2019548324A priority Critical patent/JP7128197B2/en
Priority to CN201780088717.8A priority patent/CN110446656B/en
Publication of WO2018174364A1 publication Critical patent/WO2018174364A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPINGย 
    • 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
    • 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
    • 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
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • 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
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/004—Details of vessels or of the filling or discharging of vessels for large storage vessels not under pressure
    • 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
    • F17C6/00—Methods and apparatus for filling vessels not under pressure with liquefied or solidified gases
    • 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
    • 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
    • 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
    • F25J1/0269—Arrangement of liquefaction units or equipments fulfilling the same process step, e.g. multiple "trains" concept
    • F25J1/0271—Inter-connecting multiple cold equipments within or downstream of the cold box
    • 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
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0171—Arrangement
    • F17C2227/0185—Arrangement comprising several pumps or compressors
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0337—Heat exchange with the fluid by cooling
    • F17C2227/0339—Heat exchange with the fluid by cooling using the same fluid
    • 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
    • F17C2265/01—Purifying the fluid
    • F17C2265/015—Purifying the fluid by separating
    • F17C2265/017—Purifying the fluid by separating different phases of a same fluid
    • 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
    • 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
    • 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
    • F17C2265/03—Treating the boil-off
    • F17C2265/032—Treating the boil-off by recovery
    • F17C2265/038—Treating the boil-off by recovery with expanding
    • 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
    • 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
    • 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
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/08—Cold compressor, i.e. suction of the gas at cryogenic temperature and generally without afterstage-cooler
    • 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
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/30—Compression of the feed stream
    • 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
    • F25J2240/00—Processes or apparatus involving steps for expanding of process streams
    • F25J2240/40—Expansion without extracting work, i.e. isenthalpic throttling, e.g. JT valve, regulating valve or venturi, or isentropic nozzle, e.g. Laval
    • 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 liquefaction temperature of natural gas is a cryogenic temperature of -162 ยฐC
  • liquefied natural gas is easily evaporated because it is sensitive to temperature changes.
  • the storage tank storing the liquefied natural gas is insulated.
  • the natural gas is continuously vaporized in the storage tank during the transport of the liquefied natural gas.
  • -Off Gas, BOG occurs.
  • BOG -Off Gas
  • the second compressor 220 is added to the boil-off gas undergoing re-liquefaction without being sent to the gas consumption (C) of the boil-off gas compressed by the first compressor (210). , And then to the heat exchanger (100), the additional compression of the boil-off gas to the second compressor 220, because the required pressure of the X-DF engine or DF engine using a relatively low pressure natural gas as fuel Since it is lower than the pressure required for the reliquefaction efficiency, it is to compensate for the insufficient pressure by the second compressor (220).
  • the second compressor may be oil-free lubrication.
  • the heat exchanger 100 of the present embodiment heats and cools the boil-off gas compressed by the second compressor 220 using the boil-off gas discharged from the storage tank T as a refrigerant.
  • Some or all of the evaporated gas that has undergone the compression of the second compressor 220, the cooling of the heat exchanger 100, and the expansion of the pressure reducing device 300 is reliquefied.
  • the first compressor 210 for supplying the boil-off gas to the gas consumer C is continuously used in the ship operation, while the second compressor 220 used for the liquefaction of the boil-off gas needs to re-liquefy the boil-off gas. Since it is used only when there is, the maintenance cycle is not significantly shortened even when the oil-free lubrication type compressor is applied to the first compressor 210.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Ocean & Marine Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

A boil-off gas reliquefaction system for a vessel is disclosed. The boil-off gas reliquefaction system for a vessel comprises: a second compressor for compressing some of boil-off gas; a heat exchanger for cooling the boil-off gas compressed by the second compressor, by subjecting same to a heat exchange with the rest of the boil-off gas not sent to the second compressor as a refrigerant; a first compressor for compressing the boil-off gas used as the refrigerant in the heat exchanger; and a decompression device for expanding the fluid cooled by the heat exchanger.

Description

์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ ๋ฐ ๋ฐฉ๋ฒ•Marine liquefied gas reliquefaction system and method

๋ณธ ๋ฐœ๋ช…์€ ์„ ๋ฐ•์— ํƒ‘์žฌ๋œ ์ €์žฅํƒฑํฌ์—์„œ ๋ฐœ์ƒํ•˜๋Š” ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์ฆ๋ฐœ๊ฐ€์Šค ์ž์ฒด๋ฅผ ๋ƒ‰๋งค๋กœ ํ•˜์—ฌ ์žฌ์•กํ™” ์‹œํ‚ค๋Š” ์‹œ์Šคํ…œ์— ๊ด€ํ•œ ๊ฒƒ์ด๋‹ค.The present invention relates to a system for reliquefying evaporated gas generated in a storage tank mounted on a vessel by using evaporated gas itself as a refrigerant.

๊ทผ๋ž˜, ์•กํ™”์ฒœ์—ฐ๊ฐ€์Šค(Liquefied Natural Gas, LNG) ๋“ฑ์˜ ์•กํ™”๊ฐ€์Šค์˜ ์†Œ๋น„๋Ÿ‰์ด ์ „ ์„ธ๊ณ„์ ์œผ๋กœ ๊ธ‰์ฆํ•˜๊ณ  ์žˆ๋Š” ์ถ”์„ธ์ด๋‹ค. ๊ฐ€์Šค๋ฅผ ์ €์˜จ์—์„œ ์•กํ™”์‹œํ‚จ ์•กํ™”๊ฐ€์Šค๋Š” ๊ฐ€์Šค์— ๋น„ํ•ด ๋ถ€ํ”ผ๊ฐ€ ๋งค์šฐ ์ž‘์•„์ง€๋ฏ€๋กœ ์ €์žฅ ๋ฐ ์ด์†ก ํšจ์œจ์„ ๋†’์ผ ์ˆ˜ ์žˆ๋Š” ์žฅ์ ์ด ์žˆ๋‹ค. ๋˜ํ•œ, ์•กํ™”์ฒœ์—ฐ๊ฐ€์Šค๋ฅผ ๋น„๋กฏํ•œ ์•กํ™”๊ฐ€์Šค๋Š” ์•กํ™”๊ณต์ • ์ค‘์— ๋Œ€๊ธฐ์˜ค์—ผ ๋ฌผ์งˆ์„ ์ œ๊ฑฐํ•˜๊ฑฐ๋‚˜ ์ค„์ผ ์ˆ˜ ์žˆ์–ด, ์—ฐ์†Œ์‹œ ๋Œ€๊ธฐ์˜ค์—ผ ๋ฌผ์งˆ ๋ฐฐ์ถœ์ด ์ ์€ ์นœํ™˜๊ฒฝ ์—ฐ๋ฃŒ๋กœ๋„ ๋ณผ ์ˆ˜ ์žˆ๋‹ค. Recently, the consumption of liquefied gas such as liquefied natural gas (Liquefied Natural Gas, LNG) is increasing worldwide. Liquefied gas liquefied gas at low temperature has the advantage that the storage and transport efficiency can be improved because the volume is very small compared to the gas. In addition, liquefied gas, including liquefied natural gas can remove or reduce air pollutants during the liquefaction process, it can be seen as an environmentally friendly fuel with less emissions of air pollutants during combustion.

์•กํ™”์ฒœ์—ฐ๊ฐ€์Šค๋Š” ๋ฉ”ํƒ„(methane)์„ ์ฃผ์„ฑ๋ถ„์œผ๋กœ ํ•˜๋Š” ์ฒœ์—ฐ๊ฐ€์Šค๋ฅผ ์•ฝ -162โ„ƒ๋กœ ๋ƒ‰๊ฐํ•ด์„œ ์•กํ™”์‹œํ‚ด์œผ๋กœ์จ ์–ป์„ ์ˆ˜ ์žˆ๋Š” ๋ฌด์ƒ‰ํˆฌ๋ช…ํ•œ ์•ก์ฒด๋กœ์„œ, ์ฒœ์—ฐ๊ฐ€์Šค์™€ ๋น„๊ตํ•ด ์•ฝ 1/600 ์ •๋„์˜ ๋ถ€ํ”ผ๋ฅผ ๊ฐ€์ง„๋‹ค. ๋”ฐ๋ผ์„œ, ์ฒœ์—ฐ๊ฐ€์Šค๋ฅผ ์•กํ™”์‹œ์ผœ ์ด์†กํ•  ๊ฒฝ์šฐ ๋งค์šฐ ํšจ์œจ์ ์œผ๋กœ ์ด์†กํ•  ์ˆ˜ ์žˆ๊ฒŒ ๋œ๋‹ค.Liquefied natural gas is a colorless and transparent liquid obtained by liquefying natural gas containing methane as a main component at about -162 โ„ƒ, and has a volume of about 1/600 compared with natural gas. Therefore, when liquefied and transported natural gas can be transported very efficiently.

๊ทธ๋Ÿฌ๋‚˜ ์ฒœ์—ฐ๊ฐ€์Šค์˜ ์•กํ™” ์˜จ๋„๋Š” ์ƒ์•• -162 โ„ƒ์˜ ๊ทน์ €์˜จ์ด๋ฏ€๋กœ, ์•กํ™”์ฒœ์—ฐ๊ฐ€์Šค๋Š” ์˜จ๋„๋ณ€ํ™”์— ๋ฏผ๊ฐํ•˜์—ฌ ์‰ฝ๊ฒŒ ์ฆ๋ฐœ๋œ๋‹ค. ์ด๋กœ ์ธํ•ด ์•กํ™”์ฒœ์—ฐ๊ฐ€์Šค๋ฅผ ์ €์žฅํ•˜๋Š” ์ €์žฅํƒฑํฌ์—๋Š” ๋‹จ์—ด์ฒ˜๋ฆฌ๋ฅผ ํ•˜์ง€๋งŒ, ์™ธ๋ถ€์˜ ์—ด์ด ์ €์žฅํƒฑํฌ์— ์ง€์†์ ์œผ๋กœ ์ „๋‹ฌ๋˜๋ฏ€๋กœ ์•กํ™”์ฒœ์—ฐ๊ฐ€์Šค ์ˆ˜์†ก๊ณผ์ •์—์„œ ์ €์žฅํƒฑํฌ ๋‚ด์—์„œ๋Š” ์ง€์†์ ์œผ๋กœ ์•กํ™”์ฒœ์—ฐ๊ฐ€์Šค๊ฐ€ ์ž์—ฐ ๊ธฐํ™”๋˜๋ฉด์„œ ์ฆ๋ฐœ๊ฐ€์Šค(Boil-Off Gas, BOG)๊ฐ€ ๋ฐœ์ƒํ•œ๋‹ค. ์ด๋Š” ์—ํƒ„ ๋“ฑ ๋‹ค๋ฅธ ์ €์˜จ ์•กํ™”๊ฐ€์Šค์˜ ๊ฒฝ์šฐ์—๋„ ๋งˆ์ฐฌ๊ฐ€์ง€์ด๋‹ค.However, since the liquefaction temperature of natural gas is a cryogenic temperature of -162 โ„ƒ, liquefied natural gas is easily evaporated because it is sensitive to temperature changes. As a result, the storage tank storing the liquefied natural gas is insulated. However, since the external heat is continuously transferred to the storage tank, the natural gas is continuously vaporized in the storage tank during the transport of the liquefied natural gas. -Off Gas, BOG) occurs. The same applies to other low temperature liquefied gases such as ethane.

์ฆ๋ฐœ๊ฐ€์Šค๋Š” ์ผ์ข…์˜ ์†์‹ค๋กœ์„œ ์ˆ˜์†กํšจ์œจ์— ์žˆ์–ด์„œ ์ค‘์š”ํ•œ ๋ฌธ์ œ์ด๋‹ค. ๋˜ํ•œ, ์ €์žฅํƒฑํฌ ๋‚ด์— ์ฆ๋ฐœ๊ฐ€์Šค๊ฐ€ ์ถ•์ ๋˜๋ฉด ํƒฑํฌ ๋‚ด์••์ด ๊ณผ๋„ํ•˜๊ฒŒ ์ƒ์Šนํ•  ์ˆ˜ ์žˆ์–ด, ์‹ฌํ•˜๋ฉด ํƒฑํฌ๊ฐ€ ํŒŒ์†๋  ์œ„ํ—˜๋„ ์žˆ๋‹ค. ๋”ฐ๋ผ์„œ, ์ €์žฅํƒฑํฌ ๋‚ด์—์„œ ๋ฐœ์ƒํ•˜๋Š” ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์ฒ˜๋ฆฌํ•˜๊ธฐ ์œ„ํ•œ ๋‹ค์–‘ํ•œ ๋ฐฉ๋ฒ•์ด ์—ฐ๊ตฌ๋˜๋Š”๋ฐ, ์ตœ๊ทผ์—๋Š” ์ฆ๋ฐœ๊ฐ€์Šค์˜ ์ฒ˜๋ฆฌ๋ฅผ ์œ„ํ•ด, ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์žฌ์•กํ™”ํ•˜์—ฌ ์ €์žฅํƒฑํฌ๋กœ ๋ณต๊ท€์‹œํ‚ค๋Š” ๋ฐฉ๋ฒ•, ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์„ ๋ฐ•์˜ ์—”์ง„ ๋“ฑ ์—ฐ๋ฃŒ์†Œ๋น„์ฒ˜์˜ ์—๋„ˆ์ง€์›์œผ๋กœ ์‚ฌ์šฉํ•˜๋Š” ๋ฐฉ๋ฒ• ๋“ฑ์ด ์‚ฌ์šฉ๋˜๊ณ  ์žˆ๋‹ค.Boil-off gas is a kind of loss and is an important problem in transportation efficiency. In addition, when boil-off gas is accumulated in the storage tank, the internal pressure of the tank may be excessively increased, and there is also a risk that the tank may be damaged. Accordingly, various methods for treating the boil-off gas generated in the storage tank have been studied. In recent years, for the treatment of the boil-off gas, a method of re-liquefying the boil-off gas to return to the storage tank, and returning the boil-off gas to a fuel such as an engine of a ship The method used as an energy source of a consumer is used.

์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์žฌ์•กํ™”ํ•˜๊ธฐ ์œ„ํ•œ ๋ฐฉ๋ฒ•์œผ๋กœ๋Š” ๋ณ„๋„์˜ ๋ƒ‰๋งค๋ฅผ ์ด์šฉํ•œ ๋ƒ‰๋™ ์‚ฌ์ดํด์„ ๊ตฌ๋น„ํ•˜์—ฌ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ๋ƒ‰๋งค์™€ ์—ด๊ตํ™˜ํ•˜์—ฌ ์žฌ์•กํ™”ํ•˜๋Š” ๋ฐฉ๋ฒ•, ๋ฐ ๋ณ„๋„์˜ ๋ƒ‰๋งค๊ฐ€ ์—†์ด ์ฆ๋ฐœ๊ฐ€์Šค ์ž์ฒด๋ฅผ ๋ƒ‰๋งค๋กœ ํ•˜์—ฌ ์žฌ์•กํ™”ํ•˜๋Š” ๋ฐฉ๋ฒ• ๋“ฑ์ด ์žˆ๋‹ค. ํŠนํžˆ, ํ›„์ž์˜ ๋ฐฉ๋ฒ•์„ ์ฑ„์šฉํ•œ ์‹œ์Šคํ…œ์„ ๋ถ€๋ถ„ ์žฌ์•กํ™” ์‹œ์Šคํ…œ(Partial Re-liquefaction System, PRS)์ด๋ผ๊ณ  ํ•œ๋‹ค.As a method for reliquefaction of the boil-off gas, a refrigeration cycle using a separate refrigerant is used to re-liquefy the boil-off gas by exchanging the boil-off gas with the refrigerant, and a method of re-liquefying the boil-off gas itself as a refrigerant without a separate refrigerant. There is this. In particular, a system employing the latter method is called a Partial Re-liquefaction System (PRS).

ํ•œํŽธ, ์ผ๋ฐ˜์ ์œผ๋กœ ์„ ๋ฐ•์— ์‚ฌ์šฉ๋˜๋Š” ์—”์ง„ ์ค‘ ์ฒœ์—ฐ๊ฐ€์Šค๋ฅผ ์—ฐ๋ฃŒ๋กœ ์‚ฌ์šฉํ•  ์ˆ˜ ์žˆ๋Š” ์—”์ง„์œผ๋กœ DFDE, X-DF ์—”์ง„, ME-GI ์—”์ง„ ๋“ฑ์˜ ๊ฐ€์Šค์—ฐ๋ฃŒ์—”์ง„์ด ์žˆ๋‹ค.On the other hand, among the engines generally used in ships as a fuel that can use natural gas as a fuel gas engines such as DFDE, X-DF engine, ME-GI engine.

DFDE์€, 4ํ–‰์ •์œผ๋กœ ๊ตฌ์„ฑ๋˜๋ฉฐ, ๋น„๊ต์  ์ €์••์ธ 6.5bar ์ •๋„์˜ ์••๋ ฅ์„ ๊ฐ€์ง€๋Š” ์ฒœ์—ฐ๊ฐ€์Šค๋ฅผ ์—ฐ์†Œ๊ณต๊ธฐ ์ž…๊ตฌ์— ์ฃผ์ž…ํ•˜์—ฌ, ํ”ผ์Šคํ†ค์ด ์˜ฌ๋ผ๊ฐ€๋ฉด์„œ ์••์ถ•์„ ์‹œํ‚ค๋Š” ์˜คํ†  ์‚ฌ์ดํด(Otto Cycle)์„ ์ฑ„ํƒํ•˜๊ณ  ์žˆ๋‹ค.DFDE is composed of four strokes and adopts the Otto Cycle, which injects natural gas with a relatively low pressure of 6.5 bar into the combustion air inlet and compresses the piston as it rises.

X-DF ์—”์ง„์€, 2ํ–‰์ •์œผ๋กœ ๊ตฌ์„ฑ๋˜๊ณ , 16 bar ์ •๋„์˜ ์ฒœ์—ฐ๊ฐ€์Šค๋ฅผ ์—ฐ๋ฃŒ๋กœ ์‚ฌ์šฉํ•˜๋ฉฐ, ์˜คํ†  ์‚ฌ์ดํด์„ ์ฑ„ํƒํ•˜๊ณ  ์žˆ๋‹ค.The X-DF engine consists of two strokes, uses about 16 bar of natural gas as fuel, and employs an auto cycle.

ME-GI ์—”์ง„์€, 2ํ–‰์ •์œผ๋กœ ๊ตฌ์„ฑ๋˜๋ฉฐ, 300bar ๋ถ€๊ทผ์˜ ๊ณ ์•• ์ฒœ์—ฐ๊ฐ€์Šค๋ฅผ ํ”ผ์Šคํ†ค์˜ ์ƒ์‚ฌ์  ๋ถ€๊ทผ์—์„œ ์—ฐ์†Œ์‹ค์— ์ง์ ‘ ๋ถ„์‚ฌํ•˜๋Š” ๋””์ ค ์‚ฌ์ดํด(Diesel Cycle)์„ ์ฑ„ํƒํ•˜๊ณ  ์žˆ๋‹ค.The ME-GI engine is composed of two strokes and employs a diesel cycle that directly injects high pressure natural gas near 300 bar into the combustion chamber near the top dead center of the piston.

๋„ 1์€ ์ข…๋ž˜์˜ ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ์˜ ๊ฐœ๋žต๋„์ด๋‹ค.1 is a schematic diagram of a conventional vessel boil-off gas liquefaction system.

๋„ 1์„ ์ฐธ์กฐํ•˜๋ฉด, ์ข…๋ž˜์˜ ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ์€, ์—ด๊ตํ™˜๊ธฐ(100), ์ œ1 ์••์ถ•๊ธฐ(210), ์ œ2 ์••์ถ•๊ธฐ(220), ๊ฐ์••์žฅ์น˜(300), ๋ฐ ๊ธฐ์•ก๋ถ„๋ฆฌ๊ธฐ(400)๋ฅผ ํฌํ•จํ•œ๋‹ค.Referring to FIG. 1, a conventional vessel boil-off gas liquefaction system includes a heat exchanger 100, a first compressor 210, a second compressor 220, a pressure reducing device 300, and a gas-liquid separator 400. do.

์—ด๊ตํ™˜๊ธฐ(100)๋Š”, ์ €์žฅํƒฑํฌ(T)๋กœ๋ถ€ํ„ฐ ๋ฐฐ์ถœ๋œ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ๋ƒ‰๋งค๋กœ ํ•˜์—ฌ ์ œ1 ์••์ถ•๊ธฐ(210) ๋ฐ ์ œ2 ์••์ถ•๊ธฐ(220)์— ์˜ํ•ด ์••์ถ•๋œ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์—ด๊ตํ™˜์‹œ์ผœ ๋ƒ‰๊ฐ์‹œํ‚จ๋‹ค.The heat exchanger 100 exchanges and cools the boil-off gas compressed by the first compressor 210 and the second compressor 220 by using the boil-off gas discharged from the storage tank T as a refrigerant.

์ œ1 ์••์ถ•๊ธฐ(210)๋Š”, ์ €์žฅํƒฑํฌ(T)๋กœ๋ถ€ํ„ฐ ๋ฐฐ์ถœ๋œ ํ›„ ์—ด๊ตํ™˜๊ธฐ(100)์—์„œ ๋ƒ‰๋งค๋กœ ์‚ฌ์šฉ๋œ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์••์ถ•์‹œ์ผœ ๊ฐ€์Šค์†Œ๋น„์ฒ˜(C)๋กœ ๋ณด๋‚ธ๋‹ค. ๊ฐ€์Šค์†Œ๋น„์ฒ˜(C)๋Š” ๋น„๊ต์  ์ €์••์˜ ์ฒœ์—ฐ๊ฐ€์Šค๋ฅผ ์—ฐ๋ฃŒ๋กœ ์‚ฌ์šฉํ•˜๋Š” X-DF ์—”์ง„ ๋˜๋Š” DF ์—”์ง„์ผ ์ˆ˜ ์žˆ๊ณ  ๊ฐ€์Šค์—ฐ์†Œ์žฅ์น˜(GCU; Gas Combustion Unit)์ผ ์ˆ˜๋„ ์žˆ๋Š”๋ฐ, ๊ฐ€์Šค์†Œ๋น„์ฒ˜(C)๊ฐ€ X-DF ์—”์ง„ ๋˜๋Š” DF ์—”์ง„์ธ ๊ฒฝ์šฐ, ์ œ1 ์••์ถ•๊ธฐ(210)๋Š” ๊ฐ€์Šค์†Œ๋น„์ฒ˜(C)์˜ ์š”๊ตฌ ์••๋ ฅ์œผ๋กœ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์••์ถ•์‹œํ‚จ๋‹ค.After the first compressor 210 is discharged from the storage tank T, the first compressor 210 compresses the evaporated gas used as the refrigerant in the heat exchanger 100 and sends the compressed gas to the gas consumer C. The gas consumption unit C may be an X-DF engine or a DF engine using relatively low pressure natural gas as a fuel, or may be a gas combustion unit (GCU), and the gas consumption unit C may be an X-DF engine. Alternatively, in the case of the DF engine, the first compressor 210 compresses the boil-off gas to the required pressure of the gas consumer C.

์ œ2 ์••์ถ•๊ธฐ(220)๋Š”, ์ œ1 ์••์ถ•๊ธฐ(210)์— ์˜ํ•ด ์••์ถ•๋œ ์ฆ๋ฐœ๊ฐ€์Šค ์ค‘ ๊ฐ€์Šค์†Œ๋น„์ฒ˜(C)์—์„œ ์‚ฌ์šฉ๋˜์ง€ ์•Š์€ ์ž‰์—ฌ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์••์ถ•์‹œํ‚จ๋‹ค. ์ข…๋ž˜์˜ ์ œ2 ์••์ถ•๊ธฐ(220)๋Š” 3๋‹จ์œผ๋กœ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์••์ถ•์‹œํ‚ค๋Š” ๋‹ค๋‹จ์••์ถ•๊ธฐ๊ฐ€ ์ ์šฉ๋˜์—ˆ๋‹ค. ์ œ2 ์••์ถ•๊ธฐ(220)์— ์˜ํ•ด ์••์ถ•๋œ ์ฆ๋ฐœ๊ฐ€์Šค๋Š” ์—ด๊ตํ™˜๊ธฐ(100)๋กœ ๋ณด๋‚ด์ ธ ์ €์žฅํƒฑํฌ(T)๋กœ๋ถ€ํ„ฐ ๋ฐฐ์ถœ๋œ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ๋ƒ‰๋งค๋กœ ์—ด๊ตํ™˜๋˜์–ด ๋ƒ‰๊ฐ๋œ๋‹ค.The second compressor 220 compresses the excess boil-off gas that is not used in the gas consumer C among the boil-off gas compressed by the first compressor 210. The conventional second compressor 220 has been applied to a multi-stage compressor for compressing the boil-off gas in three stages. The boil-off gas compressed by the second compressor 220 is sent to the heat-exchanger 100 to heat-exchange the boil-off gas discharged from the storage tank T with a coolant.

๊ฐ์••์žฅ์น˜(300)๋Š”, ์ œ2 ์••์ถ•๊ธฐ(220)์— ์˜ํ•ด ์••์ถ•๋œ ํ›„ ์—ด๊ตํ™˜๊ธฐ(100)์— ์˜ํ•ด ๋ƒ‰๊ฐ๋œ ์œ ์ฒด๋ฅผ ํŒฝ์ฐฝ์‹œํ‚จ๋‹ค. ์ œ1 ์••์ถ•๊ธฐ(210) ๋ฐ ์ œ2 ์••์ถ•๊ธฐ(220)์˜ ์••์ถ• ๊ณผ์ •๊ณผ, ์—ด๊ตํ™˜๊ธฐ(100)์˜ ๋ƒ‰๊ฐ ๊ณผ์ •๊ณผ, ๊ฐ์••์žฅ์น˜(300)์˜ ํŒฝ์ฐฝ ๊ณผ์ •์„ ๊ฑฐ์นœ ์ฆ๋ฐœ๊ฐ€์Šค๋Š” ์ผ๋ถ€ ๋˜๋Š” ์ „๋ถ€๊ฐ€ ์žฌ์•กํ™”๋œ๋‹ค.The decompression device 300 expands the fluid cooled by the heat exchanger 100 after being compressed by the second compressor 220. Some or all of the boil-off gas that has undergone the compression process of the first compressor 210 and the second compressor 220, the cooling process of the heat exchanger 100, and the expansion process of the pressure reducing device 300 is re-liquefied.

๊ธฐ์•ก๋ถ„๋ฆฌ๊ธฐ(400)๋Š”, ๊ฐ์••์žฅ์น˜(300) ํ•˜๋ฅ˜์— ์„ค์น˜๋˜์–ด ์žฌ์•กํ™”๋œ ์•กํ™”์ฒœ์—ฐ๊ฐ€์Šค์™€ ๊ธฐ์ฒด์ƒํƒœ์˜ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ๋ถ„๋ฆฌํ•œ๋‹ค. ๊ธฐ์ฒด์ƒํƒœ์˜ ์ฆ๋ฐœ๊ฐ€์Šค์—๋Š” ์žฌ์•กํ™”๋˜์ง€ ๋ชปํ•˜๊ณ  ๋‚จ์€ ์ฆ๋ฐœ๊ฐ€์Šค์™€ ๊ฐ์••์žฅ์น˜(300)์— ์˜ํ•ด ํŒฝ์ฐฝ๋˜๋ฉฐ ์ƒ์„ฑ๋œ ํ”Œ๋ž˜์‹œ ๊ฐ€์Šค๊ฐ€ ํฌํ•จ๋  ์ˆ˜ ์žˆ๋‹ค.The gas-liquid separator 400 is installed downstream of the decompression device 300 to separate the liquefied liquefied natural gas and the gaseous evaporated gas. The gaseous evaporated gas may include the remaining evaporated gas which is not reliquefied and the flash gas which is expanded and generated by the decompression device 300.

๊ธฐ์•ก๋ถ„๋ฆฌ๊ธฐ(400)์— ์˜ํ•ด ๋ถ„๋ฆฌ๋œ ์•กํ™”์ฒœ์—ฐ๊ฐ€์Šค๋Š” ์ €์žฅํƒฑํฌ(T)๋กœ ๋ณต๊ท€๋˜๊ณ , ๊ธฐ์•ก๋ถ„๋ฆฌ๊ธฐ(400)์— ์˜ํ•ด ๋ถ„๋ฆฌ๋œ ๊ธฐ์ฒด์ƒํƒœ์˜ ์ฆ๋ฐœ๊ฐ€์Šค๋Š” ์ €์žฅํƒฑํฌ(T)๋กœ๋ถ€ํ„ฐ ๋ฐฐ์ถœ๋˜๋Š” ์ฆ๋ฐœ๊ฐ€์Šค์™€ ํ•ฉ๋ฅ˜๋˜์–ด ์—ด๊ตํ™˜๊ธฐ(100)์˜ ๋ƒ‰๋งค๋กœ ์‚ฌ์šฉ๋  ์ˆ˜ ์žˆ๋‹ค.The liquefied natural gas separated by the gas-liquid separator 400 is returned to the storage tank T, and the vaporized gaseous gas separated by the gas-liquid separator 400 is combined with the evaporated gas discharged from the storage tank T. It may be used as a refrigerant of the heat exchanger (100).

์ข…๋ž˜์˜ ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ์— ์˜ํ•˜๋ฉด, ์ œ1 ์••์ถ•๊ธฐ(210)์— ์˜ํ•ด ์••์ถ•๋œ ์ฆ๋ฐœ๊ฐ€์Šค ์ค‘ ๊ฐ€์Šค์†Œ๋น„์ฒ˜(C)๋กœ ๋ณด๋‚ด์ง€์ง€ ์•Š๊ณ  ์žฌ์•กํ™” ๊ณผ์ •์„ ๊ฑฐ์น˜๋Š” ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์ œ2 ์••์ถ•๊ธฐ(220)์— ์˜ํ•ด ์ถ”๊ฐ€๋กœ ์••์ถ•์‹œํ‚จ ํ›„ ์—ด๊ตํ™˜๊ธฐ(100)๋กœ ๋ณด๋‚ด๋Š”๋ฐ, ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์ œ2 ์••์ถ•๊ธฐ(220)์— ์ถ”๊ฐ€๋กœ ์••์ถ•์‹œํ‚ค๋Š” ์ด์œ ๋Š”, ๋น„๊ต์  ์ €์••์˜ ์ฒœ์—ฐ๊ฐ€์Šค๋ฅผ ์—ฐ๋ฃŒ๋กœ ์‚ฌ์šฉํ•˜๋Š” X-DF ์—”์ง„ ๋˜๋Š” DF ์—”์ง„์˜ ์š”๊ตฌ ์••๋ ฅ์ด ์žฌ์•กํ™” ํšจ์œจ์„ ์œ„ํ•ด ์š”๊ตฌ๋˜๋Š” ์••๋ ฅ์— ๋น„ํ•ด ๋‚ฎ์œผ๋ฏ€๋กœ, ๋ถ€์กฑํ•œ ์••๋ ฅ์„ ์ œ2 ์••์ถ•๊ธฐ(220)์— ์˜ํ•ด ๋ณด์ถฉํ•˜์—ฌ ์ฃผ๊ธฐ ์œ„ํ•ด์„œ์ด๋‹ค.According to the conventional ship boil-off gas reliquefaction system, the second compressor 220 is added to the boil-off gas undergoing re-liquefaction without being sent to the gas consumption (C) of the boil-off gas compressed by the first compressor (210). , And then to the heat exchanger (100), the additional compression of the boil-off gas to the second compressor 220, because the required pressure of the X-DF engine or DF engine using a relatively low pressure natural gas as fuel Since it is lower than the pressure required for the reliquefaction efficiency, it is to compensate for the insufficient pressure by the second compressor (220).

์ œ1 ์••์ถ•๊ธฐ(210)๋Š” ๊ฐ€์Šค์†Œ๋น„์ฒ˜(C)์˜ ์š”๊ตฌ ์••๋ ฅ์œผ๋กœ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์••์ถ•์‹œํ‚ค๋ฏ€๋กœ, X-DF ์—”์ง„์˜ ๊ฒฝ์šฐ ๋Œ€๋žต 16 bar, DF ์—”์ง„์˜ ๊ฒฝ์šฐ ๋Œ€๋žต 6.5 bar์˜ ์••๋ ฅ์œผ๋กœ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์••์ถ•์‹œํ‚ค๋Š”๋ฐ, ์—ด๊ตํ™˜๊ธฐ(100)์—์„œ ์—ด๊ตํ™˜ ํšจ์œจ์€, ์œ ์ฒด๊ฐ€ ์ดˆ์ž„๊ณ„ ์ƒํƒœ(์ฒœ์—ฐ๊ฐ€์Šค์˜ ๊ฒฝ์šฐ ๋Œ€๋žต 47 bar)๊ฐ€ ์•„๋‹Œ ๊ฒฝ์šฐ ์ดˆ์ž„๊ณ„ ์ƒํƒœ์ธ ๊ฒฝ์šฐ์— ๋น„ํ•ด ํ˜„์ €ํžˆ ๋‚ฎ์œผ๋ฉฐ, 150 bar ๋‚ด์ง€ 400 bar, ๋ฐ”๋žŒ์งํ•˜๊ฒŒ๋Š” 150 bar ๋‚ด์ง€ 300 bar ์‚ฌ์ด์—์„œ ๊ฐ€์žฅ ๋†’๋‹ค.Since the first compressor 210 compresses the boil-off gas at the required pressure of the gas consumption C, the boil-off gas is compressed at a pressure of about 16 bar for the X-DF engine and about 6.5 bar for the DF engine. The heat exchange efficiency at 100 is significantly lower than in the supercritical state if the fluid is not in the supercritical state (approximately 47 bar for natural gas), and is between 150 bar and 400 bar, preferably between 150 bar and 300 bar. The highest among.

๊ฐ€์Šค์†Œ๋น„์ฒ˜(C)๊ฐ€ ๋Œ€๋žต 300 bar์˜ ์••๋ ฅ์˜ ์ฒœ์—ฐ๊ฐ€์Šค๋ฅผ ์š”๊ตฌํ•˜๋Š” ME-GI ์—”์ง„์ด๋ผ๋ฉด, ์ œ1 ์••์ถ•๊ธฐ(210)๊ฐ€ ๋Œ€๋žต 300 bar๋กœ ์••์ถ•์‹œํ‚จ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ, ์ œ2 ์••์ถ•๊ธฐ(220)์— ์˜ํ•ด ์ถ”๊ฐ€๋กœ ์••์ถ•์‹œํ‚ค์ง€ ์•Š์•„๋„ ์ถฉ๋ถ„ํ•œ ์žฌ์•กํ™” ํšจ์œจ์„ ํ™•๋ณดํ•  ์ˆ˜ ์žˆ์œผ๋‚˜, ๊ฐ€์Šค์†Œ๋น„์ฒ˜(C)๊ฐ€ X-DF ์—”์ง„ ๋˜๋Š” DF ์—”์ง„์ธ ๊ฒฝ์šฐ์—๋Š” ์—”์ง„์˜ ์š”๊ตฌ ์••๋ ฅ์ด ์žฌ์•กํ™” ํšจ์œจ์— ํ•„์š”ํ•œ ์••๋ ฅ๋ณด๋‹ค ๋‚ฎ์œผ๋ฏ€๋กœ, ์ œ2 ์••์ถ•๊ธฐ(220)์— ์˜ํ•ด ๋ถ€์กฑํ•œ ์••๋ ฅ์„ ๋ณด์ถฉํ•˜์—ฌ ์žฌ์•กํ™” ํšจ์œจ์„ ํ™•๋ณดํ•˜๋Š” ๊ฒƒ์ด๋‹ค. ์ข…๋ž˜์˜ ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ์— ์˜ํ•˜๋ฉด, ์ œ2 ์••์ถ•๊ธฐ(220)๋Š” ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ๋Œ€๋žต 150 bar๋กœ ์••์ถ•์‹œ์ผฐ๋‹ค.If the gas consumption C is a ME-GI engine requiring a natural gas of approximately 300 bar pressure, the second compressor 220 further supplies the boil-off gas compressed by the first compressor 210 to approximately 300 bar. Although sufficient reliquefaction efficiency can be secured without compression, when the gas consumer C is an X-DF engine or a DF engine, since the required pressure of the engine is lower than the pressure required for reliquefaction efficiency, the second compressor 220 is used. By replenishing the insufficient pressure to ensure the re-liquefaction efficiency. According to the conventional ship boil-off gas liquefaction system, the second compressor 220 compressed the boil-off gas to approximately 150 bar.

๊ทธ๋Ÿฌ๋‚˜, ์ข…๋ž˜์˜ ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ์— ์˜ํ•˜๋ฉด, ์ œ1 ์••์ถ•๊ธฐ(210)๋กœ ๊ธ‰์œ  ์œคํ™œ ๋ฐฉ์‹์˜ ์••์ถ•๊ธฐ๋ฅผ ์ ์šฉํ•จ์— ๋”ฐ๋ผ, ์ œ1 ์••์ถ•๊ธฐ(210)์— ์˜ํ•ด ์••์ถ•๋˜๋ฉฐ ์ฆ๋ฐœ๊ฐ€์Šค์— ์ผ๋ถ€ ์„ž์ธ ์˜ค์ผ์ด ์—ด๊ตํ™˜๊ธฐ(100)๋กœ ์œ ์ž…๋˜์–ด ์—ด๊ตํ™˜๊ธฐ(100)์˜ ์œ ๋กœ๋ฅผ ๋ง‰๊ฑฐ๋‚˜ ์—ด๊ตํ™˜ ํšจ์œจ์„ ๋–จ์–ด๋œจ๋ฆฌ๋Š” ํ˜„์ƒ์ด ๋ฐœ์ƒํ•˜์˜€๋‹ค. ๋˜ํ•œ, ์˜ค์ผ์ด ์„ž์ธ ์ฆ๋ฐœ๊ฐ€์Šค๊ฐ€ ์žฌ์•กํ™”๋˜์–ด ์ €์žฅํƒฑํฌ๋กœ ํšŒ์ˆ˜๋จ์œผ๋กœ์จ, ์ €์žฅํƒฑํฌ์— ์ €์žฅ๋œ ์•กํ™”์ฒœ์—ฐ๊ฐ€์Šค์˜ ์ˆœ๋„๊ฐ€ ๋–จ์–ด์ง„๋‹ค๋Š” ๋ฌธ์ œ์ ์ด ์žˆ์—ˆ๋‹ค.However, according to the conventional ship boil-off gas reliquefaction system, according to the application of the lubrication lubrication type compressor to the first compressor 210, the oil compressed by the first compressor 210 and partially mixed with the boil-off gas is a heat exchanger ( Flowing into the 100 has occurred a phenomenon of blocking the flow path of the heat exchanger 100 or lowering the heat exchange efficiency. In addition, there is a problem in that the purity of the liquefied natural gas stored in the storage tank is reduced because the oil-mixed evaporated gas is liquefied and recovered to the storage tank.

๋งŒ์•ฝ ์ œ1 ์••์ถ•๊ธฐ(210)๋กœ ๋ฌด๊ธ‰์œ  ์œคํ™œ ๋ฐฉ์‹์˜ ์••์ถ•๊ธฐ๋ฅผ ์ ์šฉํ•˜๋ฉด, ๊ธ‰์œ  ์œคํ™œ ๋ฐฉ์‹์ธ ๊ฒฝ์šฐ์— 2.5๋…„์ด์—ˆ๋˜ ์ •๋น„ ์ฃผ๊ธฐ๊ฐ€ 1๋…„์œผ๋กœ ๋‹จ์ถ•๋˜์–ด ์œ ์ง€ ๋น„์šฉ์ด ์ฆ๊ฐ€ํ•˜๊ฒŒ ๋˜๋ฉฐ, ์ผ๋ฐ˜์ ์œผ๋กœ ์„ ๋ฐ•์€ 2.5๋…„ ์ฃผ๊ธฐ๋กœ ๋„ํ‚นํ•˜์—ฌ ์ •๋น„๋ฅผ ํ•˜๋ฏ€๋กœ, ์ •๋น„ ์ฃผ๊ธฐ๊ฐ€ 1๋…„์ธ ๋ฌด๊ธ‰์œ  ์œคํ™œ ๋ฐฉ์‹์˜ ์••์ถ•๊ธฐ๋ฅผ ์ ์šฉํ•˜๋Š” ๊ฒƒ์ด ๊ฑฐ์˜ ๋ถˆ๊ฐ€๋Šฅํ•œ ์‹ค์ •์ด๋‹ค.If the compressor of the non-lubricated lubrication type is applied to the first compressor 210, in the case of the lubrication lubrication type, the maintenance period, which was 2.5 years, is shortened to 1 year, thereby increasing the maintenance cost, and in general, the ship is docked every 2.5 years. Since maintenance is performed, it is almost impossible to apply an oil-free lubricating compressor having a maintenance period of one year.

๋ณธ ๋ฐœ๋ช…์€ ์ด๋Ÿฌํ•œ ์ข…๋ž˜ ๊ธฐ์ˆ ์˜ ๋ฌธ์ œ์ ์„ ํ•ด๊ฒฐํ•˜๊ธฐ ์œ„ํ•œ ๊ฒƒ์œผ๋กœ์„œ, ์—ด๊ตํ™˜๊ธฐ์˜ ์œ ๋กœ๊ฐ€ ์˜ค์ผ์— ์˜ํ•ด ๋ง‰ํžˆ์ง€ ์•Š๋„๋ก ๊ตฌ์„ฑ๋œ ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ์„ ์ œ๊ณตํ•˜๊ณ ์ž ํ•œ๋‹ค.The present invention is to solve the problems of the prior art, and to provide a marine boil-off gas reliquefaction system is configured so that the flow path of the heat exchanger is not blocked by oil.

์ƒ๊ธฐ ๋ชฉ์ ์„ ๋‹ฌ์„ฑํ•˜๊ธฐ ์œ„ํ•œ ๋ณธ ๋ฐœ๋ช…์˜ ์ผ ์ธก๋ฉด์— ๋”ฐ๋ฅด๋ฉด, ์ฆ๋ฐœ๊ฐ€์Šค์˜ ์ผ๋ถ€๋ฅผ ์••์ถ•์‹œํ‚ค๋Š” ์ œ2 ์••์ถ•๊ธฐ; ์ƒ๊ธฐ ์ œ2 ์••์ถ•๊ธฐ๋กœ ๋ณด๋‚ด์ง€์ง€ ์•Š์€ ๋‚˜๋จธ์ง€ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ๋ƒ‰๋งค๋กœ ์ƒ๊ธฐ ์ œ2 ์••์ถ•๊ธฐ์— ์˜ํ•ด ์••์ถ•๋œ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์—ด๊ตํ™˜์‹œ์ผœ ๋ƒ‰๊ฐ์‹œํ‚ค๋Š” ์—ด๊ตํ™˜๊ธฐ; ์ƒ๊ธฐ ์—ด๊ตํ™˜๊ธฐ์—์„œ ๋ƒ‰๋งค๋กœ ์‚ฌ์šฉ๋œ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์••์ถ•์‹œํ‚ค๋Š” ์ œ1 ์••์ถ•๊ธฐ; ๋ฐ ์ƒ๊ธฐ ์—ด๊ตํ™˜๊ธฐ์— ์˜ํ•ด ๋ƒ‰๊ฐ๋œ ์œ ์ฒด๋ฅผ ํŒฝ์ฐฝ์‹œํ‚ค๋Š” ๊ฐ์••์žฅ์น˜;๋ฅผ ํฌํ•จํ•˜๋Š”, ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ์ด ์ œ๊ณต๋œ๋‹ค.According to an aspect of the present invention for achieving the above object, a second compressor for compressing a part of the boil-off gas; A heat exchanger for cooling the remaining boil-off gas not sent to the second compressor by heat-exchanging the boil-off gas compressed by the second compressor with a refrigerant; A first compressor for compressing the boil-off gas used as the refrigerant in the heat exchanger; And a decompression device for expanding the fluid cooled by the heat exchanger.

์ƒ๊ธฐ ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ์€, ์ƒ๊ธฐ ๊ฐ์••์žฅ์น˜ ํ•˜๋ฅ˜์— ์„ค์น˜๋˜์–ด ์žฌ์•กํ™”๋œ ์•กํ™”์ฒœ์—ฐ๊ฐ€์Šค์™€ ๊ธฐ์ฒด์ƒํƒœ์˜ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ๋ถ„๋ฆฌํ•˜๋Š” ๊ธฐ์•ก๋ถ„๋ฆฌ๊ธฐ๋ฅผ ๋” ํฌํ•จํ•  ์ˆ˜ ์žˆ๋‹ค.The vessel boil-off gas liquefaction system may further include a gas-liquid separator installed downstream of the decompression device to separate the liquefied liquefied natural gas and the gaseous boil-off gas.

์ƒ๊ธฐ ๊ธฐ์•ก๋ถ„๋ฆฌ๊ธฐ์— ์˜ํ•ด ๋ถ„๋ฆฌ๋œ ๊ธฐ์ฒด์ƒํƒœ์˜ ์ฆ๋ฐœ๊ฐ€์Šค๋Š” ์ƒ๊ธฐ ์—ด๊ตํ™˜๊ธฐ๋กœ ๋ณด๋‚ด์ง€๋Š” ์ฆ๋ฐœ๊ฐ€์Šค์™€ ํ•ฉ๋ฅ˜๋˜์–ด ์ƒ๊ธฐ ์—ด๊ตํ™˜๊ธฐ์˜ ๋ƒ‰๋งค๋กœ ์‚ฌ์šฉ๋  ์ˆ˜ ์žˆ๋‹ค.The gaseous evaporated gas separated by the gas-liquid separator may be combined with the evaporated gas sent to the heat exchanger and used as a refrigerant of the heat exchanger.

์ƒ๊ธฐ ์ œ1 ์••์ถ•๊ธฐ๋Š” ๊ธ‰์œ  ์œคํ™œ ๋ฐฉ์‹์ผ ์ˆ˜ ์žˆ๋‹ค.The first compressor may be oil supply lubrication.

์ƒ๊ธฐ ์ œ2 ์••์ถ•๊ธฐ๋Š” ๋ฌด๊ธ‰์œ  ์œคํ™œ ๋ฐฉ์‹์ผ ์ˆ˜ ์žˆ๋‹ค.The second compressor may be oil-free lubrication.

์ƒ๊ธฐ ์ œ2 ์••์ถ•๊ธฐ๋Š” 4๋‹จ์œผ๋กœ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์••์ถ•์‹œํ‚ค๋Š” ๋‹ค๋‹จ์••์ถ•๊ธฐ์ผ ์ˆ˜ ์žˆ๋‹ค.The second compressor may be a multistage compressor that compresses the boil-off gas in four stages.

์ƒ๊ธฐ ์ œ2 ์••์ถ•๊ธฐ๋Š” ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ 150 bar๋กœ ์••์ถ•์‹œํ‚ฌ ์ˆ˜ ์žˆ๋‹ค.The second compressor may compress the boil-off gas to 150 bar.

์ƒ๊ธฐ ์ œ1 ์••์ถ•๊ธฐ์— ์˜ํ•ด ์••์ถ•๋œ ์ฆ๋ฐœ๊ฐ€์Šค๋Š” ๊ฐ€์Šค์†Œ๋น„์ฒ˜๋กœ ๋ณด๋‚ด์งˆ ์ˆ˜ ์žˆ๊ณ , ์ƒ๊ธฐ ์ œ1 ์••์ถ•๊ธฐ๋Š” ์ƒ๊ธฐ ๊ฐ€์Šค์†Œ๋น„์ฒ˜์˜ ์š”๊ตฌ ์••๋ ฅ์œผ๋กœ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์••์ถ•์‹œํ‚ฌ ์ˆ˜ ์žˆ๋‹ค.The boil-off gas compressed by the first compressor may be sent to a gas consumer, and the first compressor may compress the boil-off gas to a required pressure of the gas consumer.

์ƒ๊ธฐ ๊ฐ€์Šค์†Œ๋น„์ฒ˜๋Š”, ME-GI ์—”์ง„, X-DF ์—”์ง„, DF ์—”์ง„, ๋ฐ ๊ฐ€์Šค์—ฐ์†Œ์žฅ์น˜ ์ค‘ ํ•˜๋‚˜ ์ด์ƒ์ผ ์ˆ˜ ์žˆ๋‹ค.The gas consumer may be one or more of a ME-GI engine, an X-DF engine, a DF engine, and a gas combustion device.

์ƒ๊ธฐ ๋ชฉ์ ์„ ๋‹ฌ์„ฑํ•˜๊ธฐ ์œ„ํ•œ ๋ณธ ๋ฐœ๋ช…์˜ ๋‹ค๋ฅธ ์ธก๋ฉด์— ๋”ฐ๋ฅด๋ฉด, 1) ์ฆ๋ฐœ๊ฐ€์Šค์˜ ์ผ๋ถ€๋ฅผ ์ œ2 ์••์ถ•๊ธฐ์— ์˜ํ•ด ์••์ถ•์‹œํ‚ค๋Š” ๋‹จ๊ณ„; 2) ์ƒ๊ธฐ ์ œ2 ์••์ถ•๊ธฐ๋กœ ๋ณด๋‚ด์ง€์ง€ ์•Š์€ ์ฆ๋ฐœ๊ฐ€์Šค์˜ ๋‹ค๋ฅธ ์ผ๋ถ€๋ฅผ ๋ƒ‰๋งค๋กœ ์ƒ๊ธฐ 1)๋‹จ๊ณ„์—์„œ ์••์ถ•๋œ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์—ด๊ตํ™˜์‹œ์ผœ ๋ƒ‰๊ฐ์‹œํ‚ค๋Š” ๋‹จ๊ณ„; 3) ์ƒ๊ธฐ 2)๋‹จ๊ณ„์—์„œ ์—ด๊ตํ™˜์˜ ๋ƒ‰๋งค๋กœ ์‚ฌ์šฉ๋œ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์ œ1 ์••์ถ•๊ธฐ์— ์˜ํ•ด ๊ฐ€์Šค์†Œ๋น„์ฒ˜์˜ ์š”๊ตฌ ์••๋ ฅ์œผ๋กœ ์••์ถ•์‹œ์ผœ ์ƒ๊ธฐ ๊ฐ€์Šค์†Œ๋น„์ฒ˜๋กœ ๋ณด๋‚ด๋Š” ๋‹จ๊ณ„; ๋ฐ 4) ์ƒ๊ธฐ 2)๋‹จ๊ณ„์—์„œ ๋ƒ‰๊ฐ๋œ ์œ ์ฒด๋ฅผ ํŒฝ์ฐฝ์‹œํ‚ค๋Š” ๋‹จ๊ณ„;๋ฅผ ํฌํ•จํ•˜๊ณ , ์ƒ๊ธฐ ์ œ1 ์••์ถ•๊ธฐ๋Š” ๊ธ‰์œ  ์œคํ™œ ๋ฐฉ์‹์ด๊ณ , ์ƒ๊ธฐ ์ œ2 ์••์ถ•๊ธฐ๋Š” ๋ฌด๊ธ‰์œ  ์œคํ™œ ๋ฐฉ์‹์ธ, ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ๋ฐฉ๋ฒ•์ด ์ œ๊ณต๋œ๋‹ค.According to another aspect of the present invention for achieving the above object, 1) compressing a portion of the boil-off gas by a second compressor; 2) cooling the other part of the boil-off gas not sent to the second compressor by using a refrigerant to heat-exchange the boil-off gas compressed in the step 1); 3) compressing the evaporated gas used as the refrigerant of the heat exchanger in the step 2) to the required pressure of the gas consumer by the first compressor and sending it to the gas consumer; And 4) expanding the fluid cooled in the step 2), wherein the first compressor is an oil supply lubrication method, and the second compressor is an oil free lubrication method.

๋ณธ ๋ฐœ๋ช…์— ์˜ํ•˜๋ฉด, ๊ธ‰์œ  ์œคํ™œ ๋ฐฉ์‹์˜ ์ œ1 ์••์ถ•๊ธฐ๋ฅผ ์ฑ„ํƒํ•จ์œผ๋กœ์จ ์ •๋น„์˜ ํšจ์œจ์„ฑ์„ ํ™•๋ณดํ•˜๊ณ  ์œ ์ง€ ๋น„์šฉ์„ ์ ˆ๊ฐํ•  ์ˆ˜ ์žˆ์œผ๋ฉฐ, ๋ฌด๊ธ‰์œ  ์œคํ™œ ๋ฐฉ์‹์˜ ์ œ2 ์••์ถ•๊ธฐ๋ฅผ ์ฑ„ํƒํ•จ์œผ๋กœ์จ ์—ด๊ตํ™˜๊ธฐ๊ฐ€ ์˜ค์ผ์— ์˜ํ•ด ๋ง‰ํžˆ๊ฑฐ๋‚˜ ์—ด๊ตํ™˜ ํšจ์œจ์ด ๋–จ์–ด์ง€๋Š” ๊ฒฝ์šฐ๋ฅผ ๋ฐฉ์ง€ํ•  ์ˆ˜ ์žˆ๋‹ค.According to the present invention, it is possible to ensure the maintenance efficiency and reduce the maintenance cost by adopting the first compressor of the lubrication type, and the heat exchanger is blocked by oil or the heat exchange efficiency is inferior by adopting the second compressor of the lubrication type. The case can be prevented.

๋˜ํ•œ, ๋ณธ ๋ฐœ๋ช…์— ์˜ํ•˜๋ฉด, ์˜ค์ผ์ด ์„ž์ธ ์ฆ๋ฐœ๊ฐ€์Šค๊ฐ€ ์žฌ์•กํ™”๋˜์–ด ์ €์žฅํƒฑํฌ๋กœ ํšŒ์ˆ˜๋˜๋Š” ๊ฒƒ์„ ๋ฐฉ์ง€ํ•  ์ˆ˜ ์žˆ์œผ๋ฉฐ, ์ข…๋ž˜์™€ ๋™์ผํ•œ ์—ด๊ตํ™˜ ํšจ์œจ ๋ฐ ์žฌ์•กํ™” ํšจ์œจ์„ ํ™•๋ณดํ•  ์ˆ˜ ์žˆ๋‹ค.Further, according to the present invention, it is possible to prevent the boil-off gas mixed with oil to be re-liquefied and recovered to the storage tank, and to ensure the same heat exchange efficiency and re-liquefaction efficiency as in the prior art.

๋„ 1์€ ์ข…๋ž˜์˜ ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ์˜ ๊ฐœ๋žต๋„์ด๋‹ค.1 is a schematic diagram of a conventional vessel boil-off gas liquefaction system.

๋„ 2๋Š” ๋ณธ ๋ฐœ๋ช…์˜ ๋ฐ”๋žŒ์งํ•œ ์‹ค์‹œ์˜ˆ์— ๋”ฐ๋ฅธ ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ์˜ ๊ฐœ๋žต๋„์ด๋‹ค.2 is a schematic view of a boil-off gas reliquefaction system according to a preferred embodiment of the present invention.

์ดํ•˜ ์ฒจ๋ถ€ํ•œ ๋„๋ฉด์„ ์ฐธ์กฐํ•˜์—ฌ ๋ณธ ๋ฐœ๋ช…์˜ ๋ฐ”๋žŒ์งํ•œ ์‹ค์‹œ์˜ˆ์— ๋Œ€ํ•œ ๊ตฌ์„ฑ ๋ฐ ์ž‘์šฉ์„ ์ƒ์„ธํžˆ ์„ค๋ช…ํ•˜๋ฉด ๋‹ค์Œ๊ณผ ๊ฐ™๋‹ค. ๋ณธ ๋ฐœ๋ช…์˜ ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ์€, ์ฒœ์—ฐ๊ฐ€์Šค๋ฅผ ์—ฐ๋ฃŒ๋กœ ์‚ฌ์šฉํ•˜๋Š” ์—”์ง„์„ ํƒ‘์žฌํ•œ ์„ ๋ฐ•, ์•กํ™”๊ฐ€์Šค ์ €์žฅํƒฑํฌ๋ฅผ ํฌํ•จํ•˜๋Š” ์„ ๋ฐ• ๋“ฑ์— ๋‹ค์–‘ํ•˜๊ฒŒ ์‘์šฉ๋˜์–ด ์ ์šฉ๋  ์ˆ˜ ์žˆ๋‹ค. ๋˜ํ•œ, ํ•˜๊ธฐ ์‹ค์‹œ์˜ˆ๋Š” ์—ฌ๋Ÿฌ ๊ฐ€์ง€ ๋‹ค๋ฅธ ํ˜•ํƒœ๋กœ ๋ณ€ํ˜•๋  ์ˆ˜ ์žˆ์œผ๋ฉฐ, ๋ณธ ๋ฐœ๋ช…์˜ ๋ฒ”์œ„๊ฐ€ ํ•˜๊ธฐ ์‹ค์‹œ์˜ˆ์— ํ•œ์ •๋˜๋Š” ๊ฒƒ์€ ์•„๋‹ˆ๋‹ค.Hereinafter, the configuration and operation of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Evaporative gas reliquefaction system for ships of the present invention can be applied to various applications, such as a ship equipped with an engine using natural gas as a fuel, a ship including a liquefied gas storage tank. In addition, the following examples may be modified in many different forms, and the scope of the present invention is not limited to the following examples.

๋ณธ ๋ฐœ๋ช…์˜ ํ›„์ˆ ํ•  ์ฆ๋ฐœ๊ฐ€์Šค ์ฒ˜๋ฆฌ๋ฅผ ์œ„ํ•œ ์‹œ์Šคํ…œ๋“ค์€ ์ €์˜จ ์•ก์ฒดํ™”๋ฌผ ๋˜๋Š” ์•กํ™”๊ฐ€์Šค๋ฅผ ์ €์žฅํ•  ์ˆ˜ ์žˆ๋Š” ์ €์žฅํƒฑํฌ๊ฐ€ ์„ค์น˜๋œ ๋ชจ๋“  ์ข…๋ฅ˜์˜ ์„ ๋ฐ•๊ณผ ํ•ด์ƒ ๊ตฌ์กฐ๋ฌผ, ์ฆ‰ ์•กํ™”์ฒœ์—ฐ๊ฐ€์Šค ์šด๋ฐ˜์„ , ์•กํ™”์—ํƒ„๊ฐ€์Šค(Liquefied Ethane Gas) ์šด๋ฐ˜์„ , LNG RV์™€ ๊ฐ™์€ ์„ ๋ฐ•์„ ๋น„๋กฏํ•˜์—ฌ, LNG FPSO, LNG FSRU์™€ ๊ฐ™์€ ํ•ด์ƒ ๊ตฌ์กฐ๋ฌผ์— ์ ์šฉ๋  ์ˆ˜ ์žˆ๋‹ค. ๋‹ค๋งŒ ํ›„์ˆ ํ•˜๋Š” ์‹ค์‹œ์˜ˆ๋“ค์—์„œ๋Š” ์„ค๋ช…์˜ ํŽธ์˜์ƒ ๋Œ€ํ‘œ์ ์ธ ์ €์˜จ ์•ก์ฒดํ™”๋ฌผ์ธ ์•กํ™”์ฒœ์—ฐ๊ฐ€์Šค๋ฅผ ์˜ˆ๋กœ ๋“ค์–ด ์„ค๋ช…ํ•œ๋‹ค.The system for the treatment of boil-off gas to be described later of the present invention includes all kinds of vessels and offshore structures, that is, liquefied natural gas carriers, liquefied ethane gas carriers, equipped with storage tanks capable of storing low temperature liquid cargo or liquefied gas, It can be applied to ships such as LNG RV, as well as offshore structures such as LNG FPSO, LNG FSRU. However, embodiments described later will be described by taking liquefied natural gas as a representative low temperature liquid cargo for the convenience of description.

๋˜ํ•œ, ๋ณธ ๋ฐœ๋ช…์˜ ๊ฐ ๋ผ์ธ์—์„œ์˜ ์œ ์ฒด๋Š”, ์‹œ์Šคํ…œ์˜ ์šด์šฉ ์กฐ๊ฑด์— ๋”ฐ๋ผ, ์•ก์ฒด ์ƒํƒœ, ๊ธฐ์•ก ํ˜ผํ•ฉ ์ƒํƒœ, ๊ธฐ์ฒด ์ƒํƒœ, ์ดˆ์ž„๊ณ„์œ ์ฒด ์ƒํƒœ ์ค‘ ์–ด๋Š ํ•˜๋‚˜์˜ ์ƒํƒœ์ผ ์ˆ˜ ์žˆ๋‹ค.In addition, the fluid in each line of the present invention may be in any one of a liquid state, a gas-liquid mixed state, a gas state, and a supercritical fluid state, depending on the operating conditions of the system.

๋„ 2๋Š” ๋ณธ ๋ฐœ๋ช…์˜ ๋ฐ”๋žŒ์งํ•œ ์‹ค์‹œ์˜ˆ์— ๋”ฐ๋ฅธ ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ์˜ ๊ฐœ๋žต๋„์ด๋‹ค.2 is a schematic view of a boil-off gas reliquefaction system according to a preferred embodiment of the present invention.

๋„ 2๋ฅผ ์ฐธ์กฐํ•˜๋ฉด, ๋ณธ ์‹ค์‹œ์˜ˆ์˜ ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ์€, ์—ด๊ตํ™˜๊ธฐ(100), ์ œ1 ์••์ถ•๊ธฐ(210), ์ œ2 ์••์ถ•๊ธฐ(220), ๋ฐ ๊ฐ์••์žฅ์น˜(300)๋ฅผ ํฌํ•จํ•œ๋‹ค.Referring to FIG. 2, the ship boil-off gas liquefaction system of the present embodiment includes a heat exchanger 100, a first compressor 210, a second compressor 220, and a decompression device 300.

๋ณธ ์‹ค์‹œ์˜ˆ์˜ ์„ ๋ฐ•์— ์„ค์น˜๋˜๋Š” ์ €์žฅํƒฑํฌ(T)๋Š”, ์•กํ™”์ฒœ์—ฐ๊ฐ€์Šค ๋“ฑ์˜ ์•กํ™”๊ฐ€์Šค๋ฅผ ๊ทน์ €์˜จ ์ƒํƒœ๋กœ ์ €์žฅํ•  ์ˆ˜ ์žˆ๋„๋ก ๋ฐ€๋ด‰ ๋ฐ ๋‹จ์—ด ๋ฐฉ๋ฒฝ์„ ๊ฐ–์ถ”๊ณ  ์žˆ์ง€๋งŒ ์™ธ๋ถ€๋กœ๋ถ€ํ„ฐ ์ „๋‹ฌ๋˜๋Š” ์—ด์„ ์™„๋ฒฝํ•˜๊ฒŒ ์ฐจ๋‹จํ•  ์ˆ˜๋Š” ์—†๋‹ค. ๋”ฐ๋ผ์„œ, ์ €์žฅํƒฑํฌ(T) ๋‚ด์—์„œ๋Š” ์•กํ™”๊ฐ€์Šค์˜ ์ฆ๋ฐœ์ด ์ง€์†์ ์œผ๋กœ ์ด๋ฃจ์–ด์ง„๋‹ค. ์ €์žฅํƒฑํฌ(T) ๋‚ด์— ์ฆ๋ฐœ๋œ ์•กํ™”๊ฐ€์Šค๊ฐ€ ์ฑ„์›Œ์งˆ์ˆ˜๋ก ํƒฑํฌ ๋‚ด์••์ด ์ƒ์Šนํ•˜๊ฒŒ ๋˜๋ฏ€๋กœ, ์ฆ๋ฐœ๊ฐ€์Šค์— ์˜ํ•œ ํƒฑํฌ ์••๋ ฅ์˜ ๊ณผ๋„ํ•œ ์ƒ์Šน์„ ๋ง‰๊ณ  ์ ์ •ํ•œ ์ˆ˜์ค€์˜ ๋‚ด์••์„ ์œ ์ง€ํ•˜๊ธฐ ์œ„ํ•ด, ์ €์žฅํƒฑํฌ(T) ๋‚ด๋ถ€์˜ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ๋ฐฐ์ถœ์‹œํ‚จ๋‹ค.The storage tank T installed in the ship of this embodiment is equipped with a sealing and insulating barrier so as to store liquefied gas such as liquefied natural gas in a cryogenic state, but cannot completely block heat transferred from the outside. Therefore, the evaporation of the liquefied gas is continuously performed in the storage tank (T). As the liquefied gas evaporated in the storage tank T is filled, the internal pressure of the tank is increased. Therefore, in order to prevent excessive increase in the tank pressure due to the evaporated gas and to maintain an appropriate internal pressure, the evaporated gas in the storage tank T is increased. Discharge it.

์ €์žฅํƒฑํฌ(T)๋กœ๋ถ€ํ„ฐ ๋ฐฐ์ถœ๋œ ์ฆ๋ฐœ๊ฐ€์Šค๋Š”, ์ผ๋ถ€๋Š” ์ œ2 ์••์ถ•๊ธฐ(220)๋กœ ๋ณด๋‚ด์ง€๊ณ , ๋‚˜๋จธ์ง€๋Š” ์—ด๊ตํ™˜๊ธฐ(100)๋กœ ๋ณด๋‚ด์ง„๋‹ค.Part of the evaporated gas discharged from the storage tank (T) is sent to the second compressor 220, and the rest is sent to the heat exchanger (100).

๋ณธ ์‹ค์‹œ์˜ˆ์˜ ์—ด๊ตํ™˜๊ธฐ(100)๋Š”, ์ €์žฅํƒฑํฌ(T)๋กœ๋ถ€ํ„ฐ ๋ฐฐ์ถœ๋œ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ๋ƒ‰๋งค๋กœ ํ•˜์—ฌ ์ œ2 ์••์ถ•๊ธฐ(220)์— ์˜ํ•ด ์••์ถ•๋œ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์—ด๊ตํ™˜์‹œ์ผœ ๋ƒ‰๊ฐ์‹œํ‚จ๋‹ค.The heat exchanger 100 of the present embodiment heats and cools the boil-off gas compressed by the second compressor 220 using the boil-off gas discharged from the storage tank T as a refrigerant.

๋ณธ ์‹ค์‹œ์˜ˆ์˜ ์ œ1 ์••์ถ•๊ธฐ(210)๋Š”, ๊ธ‰์œ  ์œคํ™œ ๋ฐฉ์‹์ด๋ฉฐ, ์ €์žฅํƒฑํฌ(T)๋กœ๋ถ€ํ„ฐ ๋ฐฐ์ถœ๋œ ํ›„ ์—ด๊ตํ™˜๊ธฐ(100)์—์„œ ๋ƒ‰๋งค๋กœ ์‚ฌ์šฉ๋œ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์••์ถ•์‹œ์ผœ ๊ฐ€์Šค์†Œ๋น„์ฒ˜(C)๋กœ ๋ณด๋‚ธ๋‹ค. ๊ฐ€์Šค์†Œ๋น„์ฒ˜(C)๋Š”, ME-GI ์—”์ง„, X-DF ์—”์ง„, DF ์—”์ง„, ๋ฐ ๊ฐ€์Šค์—ฐ์†Œ์žฅ์น˜ ์ค‘ ํ•˜๋‚˜ ์ด์ƒ์ผ ์ˆ˜ ์žˆ์œผ๋ฉฐ, ์ œ1 ์••์ถ•๊ธฐ(210)๋Š” ๊ฐ€์Šค์†Œ๋น„์ฒ˜(C)์˜ ์š”๊ตฌ ์••๋ ฅ์œผ๋กœ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์••์ถ•์‹œํ‚ฌ ์ˆ˜ ์žˆ๋‹ค.The first compressor 210 of the present embodiment is a lubrication system for lubrication, and after being discharged from the storage tank T, compresses the evaporated gas used as the refrigerant in the heat exchanger 100 and sends it to the gas consumer C. The gas consumption unit C may be one or more of a ME-GI engine, an X-DF engine, a DF engine, and a gas combustion device, and the first compressor 210 compresses the boil-off gas to the required pressure of the gas consumption C. You can.

๋ณธ ์‹ค์‹œ์˜ˆ์˜ ์ œ2 ์••์ถ•๊ธฐ(220)๋Š”, ์ €์žฅํƒฑํฌ(T)๋กœ๋ถ€ํ„ฐ ๋ฐฐ์ถœ๋œ ์ฆ๋ฐœ๊ฐ€์Šค์˜ ์ผ๋ถ€๋ฅผ ์••์ถ•์‹œ์ผœ ์—ด๊ตํ™˜๊ธฐ(100)๋กœ ๋ณด๋‚ธ๋‹ค. ์ œ2 ์••์ถ•๊ธฐ(220)๋Š” ์—ด๊ตํ™˜๊ธฐ(100)์—์„œ์˜ ์—ด๊ตํ™˜ ํšจ์œจ์„ ๋†’์—ฌ ์žฌ์•กํ™” ํšจ์œจ์„ ๋†’์ด๊ธฐ ์œ„ํ•˜์—ฌ ์„ค์น˜๋˜๋ฉฐ, ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ๋Œ€๋žต 150 bar๋กœ ์••์ถ•์‹œํ‚ฌ ์ˆ˜ ์žˆ๋‹ค. ๋˜ํ•œ, ์ œ2 ์••์ถ•๊ธฐ(220)๋Š” ๋ฌด๊ธ‰์œ  ์œคํ™œ ๋ฐฉ์‹์ด๋ฉฐ, 4๋‹จ์œผ๋กœ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์••์ถ•์‹œํ‚ค๋Š” ๋‹ค๋‹จ์••์ถ•๊ธฐ์ผ ์ˆ˜ ์žˆ๋‹ค.The second compressor 220 of the present embodiment compresses a part of the boil-off gas discharged from the storage tank T and sends it to the heat exchanger 100. The second compressor 220 is installed to increase the heat exchange efficiency in the heat exchanger 100 to increase the re-liquefaction efficiency, and may compress the boil-off gas to about 150 bar. In addition, the second compressor 220 is an oil-free lubrication method, and may be a multistage compressor that compresses the evaporated gas into four stages.

๋ณธ ์‹ค์‹œ์˜ˆ์˜ ๊ฐ์••์žฅ์น˜(300)๋Š”, ์ œ2 ์••์ถ•๊ธฐ(220)์— ์˜ํ•ด ์••์ถ•๋œ ํ›„ ์—ด๊ตํ™˜๊ธฐ(100)์— ์˜ํ•ด ๋ƒ‰๊ฐ๋œ ์œ ์ฒด๋ฅผ ํŒฝ์ฐฝ์‹œํ‚จ๋‹ค. ๊ฐ์••์žฅ์น˜(300)๋Š” ๋‹ค์ˆ˜๊ฐœ๊ฐ€ ๋ณ‘๋ ฌ๋กœ ์„ค์น˜๋  ์ˆ˜๋„ ์žˆ๋‹ค. ๋˜ํ•œ, ๊ฐ์••์žฅ์น˜(300)์˜ ์ƒ๋ฅ˜ ๋ฐ ํ•˜๋ฅ˜์—๋Š” ๊ฒฉ๋ฆฌ๋ฐธ๋ธŒ(Isolation Valve)๊ฐ€ ์„ค์น˜๋˜์–ด, ๊ฐ์••์žฅ์น˜(300)๊ฐ€ ๊ณ ์žฅ๋‚œ ๊ฒฝ์šฐ๋‚˜ ๊ฐ์••์žฅ์น˜(300)์˜ ์œ ์ง€๋ณด์ˆ˜๊ฐ€ ํ•„์š”ํ•œ ๊ฒฝ์šฐ, ๊ฐ์••์žฅ์น˜(300)๋ฅผ ๊ฒฉ๋ฆฌ์‹œํ‚ฌ ์ˆ˜ ์žˆ๋‹ค.The pressure reducing device 300 according to the present embodiment expands the fluid cooled by the heat exchanger 100 after being compressed by the second compressor 220. A plurality of decompression device 300 may be installed in parallel. In addition, an isolation valve is provided upstream and downstream of the decompression device 300 to isolate the decompression device 300 when the decompression device 300 is broken or when maintenance of the decompression device 300 is required. You can.

์ œ2 ์••์ถ•๊ธฐ(220)์˜ ์••์ถ• ๊ณผ์ •๊ณผ, ์—ด๊ตํ™˜๊ธฐ(100)์˜ ๋ƒ‰๊ฐ ๊ณผ์ •๊ณผ, ๊ฐ์••์žฅ์น˜(300)์˜ ํŒฝ์ฐฝ ๊ณผ์ •์„ ๊ฑฐ์นœ ์ฆ๋ฐœ๊ฐ€์Šค๋Š” ์ผ๋ถ€ ๋˜๋Š” ์ „๋ถ€๊ฐ€ ์žฌ์•กํ™”๋œ๋‹ค.Some or all of the evaporated gas that has undergone the compression of the second compressor 220, the cooling of the heat exchanger 100, and the expansion of the pressure reducing device 300 is reliquefied.

๋ณธ ์‹ค์‹œ์˜ˆ์˜ ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ์€, ๊ฐ์••์žฅ์น˜(300) ํ•˜๋ฅ˜์— ์„ค์น˜๋˜์–ด ์žฌ์•กํ™”๋œ ์•กํ™”์ฒœ์—ฐ๊ฐ€์Šค์™€ ๊ธฐ์ฒด์ƒํƒœ์˜ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ๋ถ„๋ฆฌํ•˜๋Š” ๊ธฐ์•ก๋ถ„๋ฆฌ๊ธฐ(400)๋ฅผ ๋” ํฌํ•จํ•  ์ˆ˜ ์žˆ๋‹ค. ๊ธฐ์ฒด์ƒํƒœ์˜ ์ฆ๋ฐœ๊ฐ€์Šค์—๋Š” ์žฌ์•กํ™”๋˜์ง€ ๋ชปํ•˜๊ณ  ๋‚จ์€ ์ฆ๋ฐœ๊ฐ€์Šค์™€ ๊ฐ์••์žฅ์น˜(300)์— ์˜ํ•ด ํŒฝ์ฐฝ๋˜๋ฉฐ ์ƒ์„ฑ๋œ ํ”Œ๋ž˜์‹œ ๊ฐ€์Šค๊ฐ€ ํฌํ•จ๋  ์ˆ˜ ์žˆ๋‹ค.The vessel boil-off liquefaction system of the present embodiment may further include a gas-liquid separator 400 installed downstream of the decompression device 300 to separate the liquefied liquefied natural gas and the gaseous boil-off gas. The gaseous evaporated gas may include the remaining evaporated gas which is not reliquefied and the flash gas which is expanded and generated by the decompression device 300.

๋ณธ ์‹ค์‹œ์˜ˆ์˜ ๊ธฐ์•ก๋ถ„๋ฆฌ๊ธฐ(400)์— ์˜ํ•ด ๋ถ„๋ฆฌ๋œ ์•กํ™”์ฒœ์—ฐ๊ฐ€์Šค๋Š” ์ €์žฅํƒฑํฌ(T)๋กœ ๋ณต๊ท€๋  ์ˆ˜ ์žˆ๊ณ , ๊ธฐ์•ก๋ถ„๋ฆฌ๊ธฐ(400)์— ์˜ํ•ด ๋ถ„๋ฆฌ๋œ ๊ธฐ์ฒด์ƒํƒœ์˜ ์ฆ๋ฐœ๊ฐ€์Šค๋Š” ์ €์žฅํƒฑํฌ(T)๋กœ๋ถ€ํ„ฐ ๋ฐฐ์ถœ๋˜๋Š” ์ฆ๋ฐœ๊ฐ€์Šค์™€ ํ•ฉ๋ฅ˜๋˜์–ด ์—ด๊ตํ™˜๊ธฐ(100)์˜ ๋ƒ‰๋งค๋กœ ์‚ฌ์šฉ๋  ์ˆ˜ ์žˆ๋‹ค.The liquefied natural gas separated by the gas-liquid separator 400 of the present embodiment may be returned to the storage tank T, and the vaporized gaseous gas separated by the gas-liquid separator 400 is discharged from the storage tank T. Joined with the boil-off gas may be used as a refrigerant of the heat exchanger (100).

๋˜ํ•œ, ๊ธฐ์•ก๋ถ„๋ฆฌ๊ธฐ(400)์— ์˜ํ•ด ๋ถ„๋ฆฌ๋œ ์ฆ๋ฐœ๊ฐ€์Šค๋Š”, ์—ด๊ตํ™˜๊ธฐ(100)์—์„œ ๋ƒ‰๋งค๋กœ ์‚ฌ์šฉ๋˜๊ธฐ ์ „์˜ ์ฆ๋ฐœ๊ฐ€์Šค์™€ ํ•ฉ๋ฅ˜๋˜์ง€ ์•Š๊ณ  ๋ณ„๋„๋กœ ๋ถ„๋ฆฌ๋˜์–ด ์—ด๊ตํ™˜๊ธฐ(100)์—์„œ ๋ƒ‰๋งค๋กœ ์‚ฌ์šฉ๋  ์ˆ˜๋„ ์žˆ๊ณ , ์ด ๊ฒฝ์šฐ ์—ด๊ตํ™˜๊ธฐ(100)๋Š” ์„ธ ์œ ๋กœ๋กœ ๊ตฌ์„ฑ๋  ์ˆ˜ ์žˆ๋‹ค.In addition, the boil-off gas separated by the gas-liquid separator 400 may be separately separated without being combined with the boil-off gas before being used as the refrigerant in the heat exchanger 100 and used as the refrigerant in the heat exchanger 100. The group 100 may be composed of three flow paths.

๋ณธ ์‹ค์‹œ์˜ˆ์˜ ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ์ด ๊ธฐ์•ก๋ถ„๋ฆฌ๊ธฐ(400)๋ฅผ ํฌํ•จํ•˜์ง€ ์•Š๋Š” ๊ฒฝ์šฐ, ์ผ๋ถ€ ๋˜๋Š” ์ „๋ถ€ ์žฌ์•กํ™”๋œ ์ฆ๋ฐœ๊ฐ€์Šค๋Š” ๊ฐ์••์žฅ์น˜(300)๋กœ๋ถ€ํ„ฐ ๋ฐ”๋กœ ์ €์žฅํƒฑํฌ๋กœ ๋ณด๋‚ด์งˆ ์ˆ˜ ์žˆ๋‹ค.When the ship boil-off gas liquefaction system of the present embodiment does not include the gas-liquid separator 400, some or all of the boil-off liquid liquefied boil-off gas may be sent directly from the decompression device 300 to the storage tank.

๋ณธ ์‹ค์‹œ์˜ˆ์˜ ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ์€, ๊ธ‰์œ  ์œคํ™œ ๋ฐฉ์‹์˜ ์ œ1 ์••์ถ•๊ธฐ(210)๋ฅผ ์ฑ„ํƒํ•จ์œผ๋กœ์จ ์ •๋น„์˜ ํšจ์œจ์„ฑ์„ ํ™•๋ณดํ•˜๊ณ  ์œ ์ง€ ๋น„์šฉ์„ ์ ˆ๊ฐํ•  ์ˆ˜ ์žˆ์œผ๋ฉฐ, ๋ฌด๊ธ‰์œ  ์œคํ™œ ๋ฐฉ์‹์˜ ์ œ2 ์••์ถ•๊ธฐ(220)๋ฅผ ์ฑ„ํƒํ•จ์œผ๋กœ์จ ์—ด๊ตํ™˜๊ธฐ(100)๊ฐ€ ์˜ค์ผ์— ์˜ํ•ด ๋ง‰ํžˆ๊ฑฐ๋‚˜ ์—ด๊ตํ™˜ ํšจ์œจ์ด ๋–จ์–ด์ง€๋Š” ๊ฒฝ์šฐ๋ฅผ ๋ฐฉ์ง€ํ•  ์ˆ˜ ์žˆ๋‹ค. ๋˜ํ•œ, ์˜ค์ผ์ด ์„ž์ธ ์ฆ๋ฐœ๊ฐ€์Šค๊ฐ€ ์žฌ์•กํ™”๋˜์–ด ์ €์žฅํƒฑํฌ๋กœ ํšŒ์ˆ˜๋˜๋Š” ๊ฒƒ์„ ๋ฐฉ์ง€ํ•  ์ˆ˜ ์žˆ์œผ๋ฉฐ, ์—ด๊ตํ™˜๊ธฐ(100)๋กœ ๋ณด๋‚ด์ง€๋Š” ์ฆ๋ฐœ๊ฐ€์Šค์˜ ์••๋ ฅ์€ ์ข…๋ž˜์˜ ๊ฒฝ์šฐ์™€ ๋™์ผํ•˜๋ฏ€๋กœ ์ข…๋ž˜์™€ ๋™์ผํ•œ ์—ด๊ตํ™˜ ํšจ์œจ ๋ฐ ์žฌ์•กํ™” ํšจ์œจ์„ ํ™•๋ณดํ•  ์ˆ˜ ์žˆ๋‹ค.In the ship boil-off gas reliquefaction system of the present embodiment, by adopting the first compressor 210 of the lubrication lubrication method, it is possible to secure the maintenance efficiency and reduce the maintenance cost, and to adopt the second compressor 220 of the lubrication-free lubrication method. As a result, the heat exchanger 100 may be prevented from being blocked by oil or deteriorating heat exchange efficiency. In addition, it is possible to prevent the oil-mixed boil-off gas is re-liquefied to be recovered to the storage tank, the pressure of the boil-off gas sent to the heat exchanger 100 is the same as the conventional case, the same heat exchange efficiency and re-liquefaction efficiency as in the prior art Can be secured.

๊ฐ€์Šค์†Œ๋น„์ฒ˜(C)๋กœ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ๊ณต๊ธ‰ํ•˜๋Š” ์ œ1 ์••์ถ•๊ธฐ(210)๋Š” ์„ ๋ฐ• ์šดํ•ญ์‹œ ์ง€์†์ ์œผ๋กœ ์‚ฌ์šฉ๋˜๋Š” ๋ฐ˜๋ฉด, ์ฆ๋ฐœ๊ฐ€์Šค์˜ ์žฌ์•กํ™”์— ์‚ฌ์šฉ๋˜๋Š” ์ œ2 ์••์ถ•๊ธฐ(220)๋Š” ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์žฌ์•กํ™”์‹œํ‚ฌ ํ•„์š”๊ฐ€ ์žˆ์„ ๋•Œ๋งŒ ์‚ฌ์šฉ๋˜๋ฏ€๋กœ, ์ œ1 ์••์ถ•๊ธฐ(210)์— ๋ฌด๊ธ‰์œ  ์œคํ™œ๋ฐฉ์‹์˜ ์••์ถ•๊ธฐ๋ฅผ ์ ์šฉํ•˜๋Š” ๊ฒฝ์šฐ์™€ ๋‹ฌ๋ฆฌ, ์ œ2 ์••์ถ•๊ธฐ(220)์— ๋ฌด๊ธ‰์œ  ์œคํ™œ๋ฐฉ์‹์˜ ์••์ถ•๊ธฐ๋ฅผ ์ ์šฉํ•˜์—ฌ๋„ ์ •๋น„ ์ฃผ๊ธฐ๊ฐ€ ํฌ๊ฒŒ ๋‹จ์ถ•๋˜์ง€ ์•Š๋Š”๋‹ค.The first compressor 210 for supplying the boil-off gas to the gas consumer C is continuously used in the ship operation, while the second compressor 220 used for the liquefaction of the boil-off gas needs to re-liquefy the boil-off gas. Since it is used only when there is, the maintenance cycle is not significantly shortened even when the oil-free lubrication type compressor is applied to the first compressor 210.

๋ณธ ๋ฐœ๋ช…์€ ์ƒ๊ธฐ ์‹ค์‹œ์˜ˆ์— ํ•œ์ •๋˜์ง€ ์•Š๊ณ , ๋ณธ ๋ฐœ๋ช…์˜ ๊ธฐ์ˆ ์  ์š”์ง€๋ฅผ ๋ฒ—์–ด๋‚˜์ง€ ์•„๋‹ˆํ•˜๋Š” ๋ฒ”์œ„ ๋‚ด์—์„œ ๋‹ค์–‘ํ•˜๊ฒŒ ์ˆ˜์ • ๋˜๋Š” ๋ณ€ํ˜•๋˜์–ด ์‹ค์‹œ๋  ์ˆ˜ ์žˆ์Œ์€ ๋ณธ ๋ฐœ๋ช…์ด ์†ํ•˜๋Š” ๊ธฐ์ˆ ๋ถ„์•ผ์—์„œ ํ†ต์ƒ์˜ ์ง€์‹์„ ๊ฐ€์ง„ ์ž์— ์žˆ์–ด์„œ ์ž๋ช…ํ•œ ๊ฒƒ์ด๋‹ค.The present invention is not limited to the above embodiments, and various modifications or changes may be made without departing from the technical spirit of the present invention, which will be apparent to those of ordinary skill in the art. It is.

Claims (10)

์ฆ๋ฐœ๊ฐ€์Šค์˜ ์ผ๋ถ€๋ฅผ ์••์ถ•์‹œํ‚ค๋Š” ์ œ2 ์••์ถ•๊ธฐ;A second compressor for compressing a part of the boil-off gas; ์ƒ๊ธฐ ์ œ2 ์••์ถ•๊ธฐ๋กœ ๋ณด๋‚ด์ง€์ง€ ์•Š์€ ๋‚˜๋จธ์ง€ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ๋ƒ‰๋งค๋กœ ์ƒ๊ธฐ ์ œ2 ์••์ถ•๊ธฐ์— ์˜ํ•ด ์••์ถ•๋œ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์—ด๊ตํ™˜์‹œ์ผœ ๋ƒ‰๊ฐ์‹œํ‚ค๋Š” ์—ด๊ตํ™˜๊ธฐ;A heat exchanger for cooling the remaining boil-off gas not sent to the second compressor by heat-exchanging the boil-off gas compressed by the second compressor with a refrigerant; ์ƒ๊ธฐ ์—ด๊ตํ™˜๊ธฐ์—์„œ ๋ƒ‰๋งค๋กœ ์‚ฌ์šฉ๋œ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์••์ถ•์‹œํ‚ค๋Š” ์ œ1 ์••์ถ•๊ธฐ; ๋ฐA first compressor for compressing the boil-off gas used as the refrigerant in the heat exchanger; And ์ƒ๊ธฐ ์—ด๊ตํ™˜๊ธฐ์— ์˜ํ•ด ๋ƒ‰๊ฐ๋œ ์œ ์ฒด๋ฅผ ํŒฝ์ฐฝ์‹œํ‚ค๋Š” ๊ฐ์••์žฅ์น˜;A pressure reducing device for expanding the fluid cooled by the heat exchanger; ๋ฅผ ํฌํ•จํ•˜๋Š”, ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ.Including, the vessel liquefied gas reliquefaction system. ์ฒญ๊ตฌํ•ญ 1์— ์žˆ์–ด์„œ,The method according to claim 1, ์ƒ๊ธฐ ๊ฐ์••์žฅ์น˜ ํ•˜๋ฅ˜์— ์„ค์น˜๋˜์–ด ์žฌ์•กํ™”๋œ ์•กํ™”์ฒœ์—ฐ๊ฐ€์Šค์™€ ๊ธฐ์ฒด์ƒํƒœ์˜ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ๋ถ„๋ฆฌํ•˜๋Š” ๊ธฐ์•ก๋ถ„๋ฆฌ๊ธฐ๋ฅผ ๋” ํฌํ•จํ•˜๋Š”, ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ.And a gas-liquid separator installed downstream of the decompression device to separate the liquefied liquefied natural gas and the gaseous evaporated gas. ์ฒญ๊ตฌํ•ญ 2์— ์žˆ์–ด์„œ,The method according to claim 2, ์ƒ๊ธฐ ๊ธฐ์•ก๋ถ„๋ฆฌ๊ธฐ์— ์˜ํ•ด ๋ถ„๋ฆฌ๋œ ๊ธฐ์ฒด์ƒํƒœ์˜ ์ฆ๋ฐœ๊ฐ€์Šค๋Š” ์ƒ๊ธฐ ์—ด๊ตํ™˜๊ธฐ๋กœ ๋ณด๋‚ด์ง€๋Š” ์ฆ๋ฐœ๊ฐ€์Šค์™€ ํ•ฉ๋ฅ˜๋˜์–ด ์ƒ๊ธฐ ์—ด๊ตํ™˜๊ธฐ์˜ ๋ƒ‰๋งค๋กœ ์‚ฌ์šฉ๋˜๋Š”, ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ.The gaseous boil-off gas separated by the gas-liquid separator is combined with the boil-off gas sent to the heat exchanger is used as a refrigerant of the heat exchanger, marine boil-off gas reliquefaction system. ์ฒญ๊ตฌํ•ญ 1 ๋‚ด์ง€ ์ฒญ๊ตฌํ•ญ 3 ์ค‘ ์–ด๋Š ํ•œ ํ•ญ์— ์žˆ์–ด์„œ,The method according to any one of claims 1 to 3, ์ƒ๊ธฐ ์ œ1 ์••์ถ•๊ธฐ๋Š” ๊ธ‰์œ  ์œคํ™œ ๋ฐฉ์‹์ธ, ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ.The first compressor is a refueling lubrication system, oil supply lubrication system for ships. ์ฒญ๊ตฌํ•ญ 1 ๋‚ด์ง€ ์ฒญ๊ตฌํ•ญ 3 ์ค‘ ์–ด๋Š ํ•œ ํ•ญ์— ์žˆ์–ด์„œ,The method according to any one of claims 1 to 3, ์ƒ๊ธฐ ์ œ2 ์••์ถ•๊ธฐ๋Š” ๋ฌด๊ธ‰์œ  ์œคํ™œ ๋ฐฉ์‹์ธ, ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ.The second compressor is a lubrication-free lubrication system, marine boil-off gas liquefaction system. ์ฒญ๊ตฌํ•ญ 1 ๋‚ด์ง€ ์ฒญ๊ตฌํ•ญ 3 ์ค‘ ์–ด๋Š ํ•œ ํ•ญ์— ์žˆ์–ด์„œ,The method according to any one of claims 1 to 3, ์ƒ๊ธฐ ์ œ2 ์••์ถ•๊ธฐ๋Š” 4๋‹จ์œผ๋กœ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์••์ถ•์‹œํ‚ค๋Š” ๋‹ค๋‹จ์••์ถ•๊ธฐ์ธ, ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ.The second compressor is a multi-stage compressor for compressing the boil-off gas in four stages, the ship boil-off gas liquefaction system. ์ฒญ๊ตฌํ•ญ 1 ๋‚ด์ง€ ์ฒญ๊ตฌํ•ญ 3 ์ค‘ ์–ด๋Š ํ•œ ํ•ญ์— ์žˆ์–ด์„œ,The method according to any one of claims 1 to 3, ์ƒ๊ธฐ ์ œ2 ์••์ถ•๊ธฐ๋Š” ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ 150 bar๋กœ ์••์ถ•์‹œํ‚ค๋Š”, ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ.And the second compressor compresses the boil-off gas to 150 bar. ์ฒญ๊ตฌํ•ญ 1 ๋‚ด์ง€ ์ฒญ๊ตฌํ•ญ 3 ์ค‘ ์–ด๋Š ํ•œ ํ•ญ์— ์žˆ์–ด์„œ,The method according to any one of claims 1 to 3, ์ƒ๊ธฐ ์ œ1 ์••์ถ•๊ธฐ์— ์˜ํ•ด ์••์ถ•๋œ ์ฆ๋ฐœ๊ฐ€์Šค๋Š” ๊ฐ€์Šค์†Œ๋น„์ฒ˜๋กœ ๋ณด๋‚ด์ง€๊ณ ,The boil-off gas compressed by the first compressor is sent to a gas consumer, ์ƒ๊ธฐ ์ œ1 ์••์ถ•๊ธฐ๋Š” ์ƒ๊ธฐ ๊ฐ€์Šค์†Œ๋น„์ฒ˜์˜ ์š”๊ตฌ ์••๋ ฅ์œผ๋กœ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์••์ถ•์‹œํ‚ค๋Š”, ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ.And the first compressor compresses the boil-off gas to the required pressure of the gas consumer. ์ฒญ๊ตฌํ•ญ 8์— ์žˆ์–ด์„œ,The method according to claim 8, ์ƒ๊ธฐ ๊ฐ€์Šค์†Œ๋น„์ฒ˜๋Š”, ME-GI ์—”์ง„, X-DF ์—”์ง„, DF ์—”์ง„, ๋ฐ ๊ฐ€์Šค์—ฐ์†Œ์žฅ์น˜ ์ค‘ ํ•˜๋‚˜ ์ด์ƒ์ธ, ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ์‹œ์Šคํ…œ.The gas consumer is a marine gaseous liquefaction system, at least one of the ME-GI engine, X-DF engine, DF engine, and gas combustion device. 1) ์ฆ๋ฐœ๊ฐ€์Šค์˜ ์ผ๋ถ€๋ฅผ ์ œ2 ์••์ถ•๊ธฐ์— ์˜ํ•ด ์••์ถ•์‹œํ‚ค๋Š” ๋‹จ๊ณ„;1) compressing a portion of the boil-off gas by a second compressor; 2) ์ƒ๊ธฐ ์ œ2 ์••์ถ•๊ธฐ๋กœ ๋ณด๋‚ด์ง€์ง€ ์•Š์€ ์ฆ๋ฐœ๊ฐ€์Šค์˜ ๋‹ค๋ฅธ ์ผ๋ถ€๋ฅผ ๋ƒ‰๋งค๋กœ ์ƒ๊ธฐ 1)๋‹จ๊ณ„์—์„œ ์••์ถ•๋œ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์—ด๊ตํ™˜์‹œ์ผœ ๋ƒ‰๊ฐ์‹œํ‚ค๋Š” ๋‹จ๊ณ„;2) cooling the other part of the boil-off gas not sent to the second compressor by using a refrigerant to heat-exchange the boil-off gas compressed in the step 1); 3) ์ƒ๊ธฐ 2)๋‹จ๊ณ„์—์„œ ์—ด๊ตํ™˜์˜ ๋ƒ‰๋งค๋กœ ์‚ฌ์šฉ๋œ ์ฆ๋ฐœ๊ฐ€์Šค๋ฅผ ์ œ1 ์••์ถ•๊ธฐ์— ์˜ํ•ด ๊ฐ€์Šค์†Œ๋น„์ฒ˜์˜ ์š”๊ตฌ ์••๋ ฅ์œผ๋กœ ์••์ถ•์‹œ์ผœ ์ƒ๊ธฐ ๊ฐ€์Šค์†Œ๋น„์ฒ˜๋กœ ๋ณด๋‚ด๋Š” ๋‹จ๊ณ„; ๋ฐ3) compressing the evaporated gas used as the refrigerant of the heat exchanger in the step 2) to the required pressure of the gas consumer by the first compressor and sending it to the gas consumer; And 4) ์ƒ๊ธฐ 2)๋‹จ๊ณ„์—์„œ ๋ƒ‰๊ฐ๋œ ์œ ์ฒด๋ฅผ ํŒฝ์ฐฝ์‹œํ‚ค๋Š” ๋‹จ๊ณ„;๋ฅผ ํฌํ•จํ•˜๊ณ ,4) expanding the fluid cooled in the step 2); ์ƒ๊ธฐ ์ œ1 ์••์ถ•๊ธฐ๋Š” ๊ธ‰์œ  ์œคํ™œ ๋ฐฉ์‹์ด๊ณ , ์ƒ๊ธฐ ์ œ2 ์••์ถ•๊ธฐ๋Š” ๋ฌด๊ธ‰์œ  ์œคํ™œ ๋ฐฉ์‹์ธ, ์„ ๋ฐ•์šฉ ์ฆ๋ฐœ๊ฐ€์Šค ์žฌ์•กํ™” ๋ฐฉ๋ฒ•.The first compressor is oil supply lubrication method, the second compressor is oil-free lubrication method, the vessel boil-off liquefaction method.
PCT/KR2017/012577 2017-03-24 2017-11-08 Boil-off gas reliquefaction system and method for vessel Ceased WO2018174364A1 (en)

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CN114729779A (en) * 2019-09-30 2022-07-08 ๆฐ”ไฝ“่ฟ่พ“ๆŠ€ๆœฏๅ…ฌๅธ System for treating a gas contained in liquid and gaseous form in a tank for storing and/or transporting the gas

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