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WO2011062505A1 - Installation pour récupérer du gaz évaporé (bog) à partir de gaz naturel liquéfié (lng) stocké dans des réservoirs - Google Patents

Installation pour récupérer du gaz évaporé (bog) à partir de gaz naturel liquéfié (lng) stocké dans des réservoirs Download PDF

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Publication number
WO2011062505A1
WO2011062505A1 PCT/NO2010/000419 NO2010000419W WO2011062505A1 WO 2011062505 A1 WO2011062505 A1 WO 2011062505A1 NO 2010000419 W NO2010000419 W NO 2010000419W WO 2011062505 A1 WO2011062505 A1 WO 2011062505A1
Authority
WO
WIPO (PCT)
Prior art keywords
lng
bog
plant
recondenser
heat exchanger
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/NO2010/000419
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English (en)
Inventor
Per Helge S. Madsen
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.)
Wartsila Oil and Gas Systems AS
Original Assignee
Hamworthy Gas Systems AS
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Filing date
Publication date
Application filed by Hamworthy Gas Systems AS filed Critical Hamworthy Gas Systems AS
Publication of WO2011062505A1 publication Critical patent/WO2011062505A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • F17C2221/01—Pure fluids
    • F17C2221/013—Carbon dioxide
    • 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
    • F17C2221/01—Pure fluids
    • F17C2221/014—Nitrogen
    • 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
    • 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
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0146—Two-phase
    • F17C2225/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2225/0169—Liquefied gas, e.g. LPG, GPL subcooled
    • 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
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/03—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the pressure level
    • F17C2225/033—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
    • 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
    • F17C2227/0135—Pumps
    • F17C2227/0142—Pumps with specified pump type, e.g. piston or impulsive type
    • 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
    • F17C2227/0157—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
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0306—Heat exchange with the fluid by heating 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
    • 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
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0309—Heat exchange with the fluid by heating using another 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
    • 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
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0309—Heat exchange with the fluid by heating using another fluid
    • F17C2227/0316—Water heating
    • F17C2227/0318—Water heating using seawater
    • 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
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0309—Heat exchange with the fluid by heating using another fluid
    • F17C2227/0323—Heat exchange with the fluid by heating using another fluid in a closed loop
    • 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
    • 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
    • F17C2227/0367—Localisation of heat exchange
    • F17C2227/0388—Localisation of heat exchange separate
    • 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
    • F17C2227/0367—Localisation of heat exchange
    • F17C2227/0388—Localisation of heat exchange separate
    • F17C2227/0393—Localisation of heat exchange separate using a vaporiser
    • 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
    • F17C2265/032—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
    • F17C2265/05—Regasification
    • 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
    • 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
    • F17C2270/0118—Offshore
    • F17C2270/0123—Terminals
    • 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
    • F17C2270/0118—Offshore
    • F17C2270/0126—Buoys
    • 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
    • F17C2270/0134—Applications for fluid transport or storage placed above the ground

Definitions

  • the present invention relates to a plant for recovering boil-off gas (BOG) originating from liquefied natural gas (LNG), for instance, stored in tanks, particularly but not exclusively on seagoing vessels.
  • BOG boil-off gas
  • LNG liquefied natural gas
  • a common technique for conveying natural gas from extraction sites is to liquefy gas at or near these sites and transport LNG to the market in specially designed storage tanks, often arranged on a sea-going vessel.
  • the process of liquefying natural gas involves compression and cooling to a cryogenic temperature, e.g. about -160°C. Then, LNG carriers may bring ashore significant amounts of LNG being unloaded into special tanks onshore, before either transported by road or rail on LNG carrying vehicles or revaporized and conveyed by pipelines.
  • a cryogenic temperature e.g. about -160°C.
  • US-Patent No. 6,089,022 discloses re- gasifying LNG from carrier vessels before revaporized gas is transferred onshore. LNG is flowed through one or more vaporizers positioned on the vessel. Seawater taken from the surrounding water is flowed through a vaporizer to heat and vaporize LNG before vaporized gas is unloaded into suitable facilities onshore.
  • US-Patent No. 6,945,049 describes regasification of LNG transported with a floating carrier vessel before the cargo is to be unloaded comprising boosting and flowing LNG into an LNG/coolant heat exchanger in which LNG is evaporated, and flowing evaporated natural gas (NG) into a NG/steam heat exchanger, in which NG is heated before being transferred onshore as superheated vapour.
  • LNG in the LNG/coolant heat exchanger is evaporated by thermal exchange against a coolant entering the heat exchanger as a gas and leaving the same in a liquefied state.
  • coolant is flowed in a closed circuit and through at least one coolant/seawater heat exchanger in which liquefied coolant is evaporated before entering the LNG/coolant heat exchanger, and the pressure in evaporated coolant is controlled.
  • LNG boils at slightly above -163 °C, and is usually loaded, transported and unloaded at this temperature. To deal with both such low temperature and BOG, special materials, insulation and handling equipment are required. Due to heat leakage, the surface is constantly boiling, generating vaporized natural gas (BOG) from LNG, e.g. methane.
  • BOG vaporized natural gas
  • the plant includes a recondenser in the form of a suction drum.
  • BOG from the cargo tanks is compressed by means of a BOG compressor and is passed along with LNG into the suction drum.
  • LNG from the cargo tanks is pumped at a temperature of -160 to -150 °C into the suction drum having typically a pressure of 500 kPa.
  • LNG including recondensed BOG is passed into at least one vaporizer as to unload LNG in the form of NG.
  • the at least one vaporizer is fed by means one common or more LNG high pressure pumps.
  • the suction drum constitutes a buffer tank for the other components of the plant being typically arranged on at least one skid. Additionally, the suction drum acts as a separator tank to separate gas being produced at different operating modes of the plant.
  • a SRV brings ashore cargo from a LNG terminal and unloads high pressure gas at either a receive jetty or subsea buoy. When emptied, the SRV returns to the LNG terminal to get a new cargo.
  • a FSRU stands stationary and supplies high pressure gas onshore at a receive jetty or subsea buoy. When needed, a LNG carrier refills the FSRU.
  • Regasification facilities for such carriers have normally a regasification capacity of minimum 50 tons/hour and maximum 500-1000 tons/hour. As the capacity of a typical regasification skid amounts to about 250 tons/hour, the number of skids needed is from 1 to 4 for the respective carriers.
  • the BOG rate is 3-5 tons/hour.
  • displacement of gases due to LNG filling causes an increased amount of gas to be removed from the tanks.
  • displaced gases amount to 10 tons/hour or even more.
  • the BOG rate for a SRV is typically 3-5 tons/hour, whereas this amounts to near 10 tons/hour for a FSRU during LNG loading.
  • LNG from the cargo tanks is transferred into the suction drum subcooled at 500 kPa, and having a temperature with boiling point just above atmospheric.
  • LNG boosted to 500 kPa is at a temperature near the ambient, e.g. 0-20 °C.
  • BOG and LNG passed into the suction drum LNG is heated due to cooling and condensation of BOG. If BOG mass corresponds to 7-10 % of the LNG mass, the result is that LNG gets at the boiling point at 500 kPa.
  • the liquid of BOG and LNG passed from the suction drum is denoted regasification fed.
  • LNG need to be boosted before regasification as to subcool the regasification fed.
  • boosting is performed by means high pressure pumps situated in front of the vaporizers producing NG.
  • the pumps are multistage centrifugal pumps, for instance.
  • Such pumps and their engines are often but not necessarily of a submerged pot type.
  • gas is generated, mainly due to pump cooling.
  • Some regasification facilities is configured to handle unwanted gas, when starting the pump, and also when forming a minor continuous amount of gas in connection with the pump housing.
  • gas being produced within the pumps has to be returned to the cargo tanks, resulting in increased BOG flow.
  • SRV For a SRV having a BOG rate of 3-5 tons/hour, it has to be available 75-125 tons/hour, which is more than a normal minimum regasification rate.
  • a FSRU with a maximum BOG rate of 10 tons/hour is in need of 200 tons/hour, which is far beyond a typical minimum regasification rate.
  • the main objective of the present invention is to solve the problems associated with state of art solutions mentioned above.
  • a plant for recovering BOG from LNG stored in tanks including a recondenser used to feed LNG into at least one pump boosting LNG to be passed through at least one vaporizer as to produce NG by regasification of LNG, BOG being compressed using a compressor, wherein BOG is passed through at least one heat exchanger situated downstream the at least one pump, in which BOG in heat exchange with LNG is condensed mainly into liquid and is returned into the recondenser.
  • the respective heat exchanger is preferentially in the form of a printed circuit heat exchanger, and BOG is leaving the heat exchanger at a temperature of -145 to -135 °C.
  • the recondenser is in the form combined with a suction drum, and the pump is in the form of a multistage centrifugal pump.
  • Fig. 1 is a simplified schematic flow diagram of a prior art BOG recovery plant, shown in combination with a number of vaporizers used when regasification of NG from LNG;
  • Fig. 2 is a simplified flow diagram of one embodiment of the present invention, in which BOG is cooled in heat exchange with LNG within heat exchangers and is passed into a recondenser mainly in the form of liquid; and
  • Fig. 3 is a simplified flow diagram of one embodiment of the present invention.
  • the present invention includes a recondenser in the form of a combined suction drum SD1, see Fig. 2.
  • LNG from cargo tanks, not illustrated is fed into the recondenser.
  • LNG being passed on from the recondenser is boosted by means of at least one high pressure pump Al, A2, A3, e.g. a multistage centrifugal pump, and in the form of a submerged pot type pump.
  • Boosted LNG is then subject to regasifica- tion within at least one vaporizer unit VU1, VU2, VU3 as to produce NG for further transport onshore.
  • the vaporizer units may be of any suitable type, e.g. a sea- water/propane loop, direct seawater, steam heated having an intermediate water/glycol loop, direct steam, etc.
  • BOG from the cargo tanks is fed into the recondenser SD1 along with LNG first after BOG has been passed through at least one heat exchanger Bl, B2, B3.
  • BOG compressed using a compressor CI is cooled within the respective heat exchanger in heat exchange with LNG and is routed into the recondenser mainly in the form of a liquid.
  • Downstream the pumps Al, A2, A3 high pressure LNG has typically a temperature of -150 to -140 °C.
  • BOG passing the heat exchangers is cooled in an interval of -145 to -135 °C.
  • BOG is having a liquid portion of 70-100 % by mass dependent on the BOG composition.
  • each heat exchanger is preferentially a compact printed circuit heat exchanger.
  • LNG is fed into the suction drum at -155,0 °C and 550,0 kPa
  • the regasification fed i.e. LNG including liquefied BOG from the heat exchangers
  • BOG enters the respective heat exchanger at 0,0 °C and 600,0 kPa and is passed into the suction drum at - 140,0 °C and 550 kPa

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

L'invention concerne une installation pour récupérer du gaz évaporé (BOG) à partir de gaz naturel liquéfié (LNG) stocké dans un réservoir, l'installation comprenant un recondenseur (SD1) utilisé pour acheminer le LNG dans des pompes (A1, A2, A3) poussant le LNG qui doit passer à travers des unités de vaporisation (VU1, VU2, VU3) de façon à produire du gaz naturel (NG) par regazéification du LNG, le BOG étant comprimé à l'aide d'un compresseur (C1). Selon la présente invention, le BOG, après sa compression dans le compresseur (C1), est amené à passer à travers des échangeurs de chaleur (B1, B2, B3) situés en aval des pompes (A1, A2, A3), dans lesquels le BOG en échange de chaleur avec LNG est condensé principalement en liquide, puis envoyé dans le recondenseur (SD1).
PCT/NO2010/000419 2009-11-17 2010-11-17 Installation pour récupérer du gaz évaporé (bog) à partir de gaz naturel liquéfié (lng) stocké dans des réservoirs Ceased WO2011062505A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20093356A NO332123B1 (no) 2009-11-17 2009-11-17 Anlegg for a gjenvinne BOG fra LNG lagret i tanker
NO20093356 2009-11-17

Publications (1)

Publication Number Publication Date
WO2011062505A1 true WO2011062505A1 (fr) 2011-05-26

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PCT/NO2010/000419 Ceased WO2011062505A1 (fr) 2009-11-17 2010-11-17 Installation pour récupérer du gaz évaporé (bog) à partir de gaz naturel liquéfié (lng) stocké dans des réservoirs

Country Status (2)

Country Link
NO (1) NO332123B1 (fr)
WO (1) WO2011062505A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012165967A1 (fr) 2011-05-30 2012-12-06 Hamworthy Oil & Gas Systems As Utilisation de gaz naturel liquéfié utilisé pour un carburant pour liquéfier une ébullition de gaz de pétrole liquéfié
CN108870431A (zh) * 2017-05-12 2018-11-23 气体运输技术公司 用于冷却液化气体和/或其自然气化气体的装置和方法

Citations (9)

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Publication number Priority date Publication date Assignee Title
JPS6217499A (ja) * 1985-07-16 1987-01-26 Ishikawajima Harima Heavy Ind Co Ltd 低温貯槽の蒸発ガス処理装置
JPH05118497A (ja) * 1991-04-30 1993-05-14 Chiyoda Corp Ｌｎｇ貯蔵設備のｂｏｇ液化システム及びその装置
JPH05263997A (ja) * 1992-03-23 1993-10-12 Osaka Gas Co Ltd Ｌｎｇ冷熱の蓄冷および有効利用方法およびその装置
US20020073619A1 (en) * 2000-12-14 2002-06-20 William Perkins Method and apparatus for delivering natural gas to remote locations
US20040065085A1 (en) * 2002-10-04 2004-04-08 Madsen Per Helge Regasification system and method
WO2007011155A1 (fr) * 2005-07-19 2007-01-25 Shinyoung Heavy Industries Co., Ltd. Appareil de reliquéfaction de gaz d’évaporats de gaz naturel liquéfié
WO2008066390A1 (fr) * 2006-11-28 2008-06-05 Moss Maritime As Regazification de gaz naturel liquéfié
JP2008309195A (ja) * 2007-06-12 2008-12-25 Tokyo Gas Co Ltd Ｌｎｇ貯蔵タンク内に発生するｂｏｇの再液化装置と再液化方法
JP2009191945A (ja) * 2008-02-14 2009-08-27 Ihi Corp 液化ガス貯蔵設備とその運転方法

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6217499A (ja) * 1985-07-16 1987-01-26 Ishikawajima Harima Heavy Ind Co Ltd 低温貯槽の蒸発ガス処理装置
JPH05118497A (ja) * 1991-04-30 1993-05-14 Chiyoda Corp Ｌｎｇ貯蔵設備のｂｏｇ液化システム及びその装置
JPH05263997A (ja) * 1992-03-23 1993-10-12 Osaka Gas Co Ltd Ｌｎｇ冷熱の蓄冷および有効利用方法およびその装置
US20020073619A1 (en) * 2000-12-14 2002-06-20 William Perkins Method and apparatus for delivering natural gas to remote locations
US20040065085A1 (en) * 2002-10-04 2004-04-08 Madsen Per Helge Regasification system and method
WO2007011155A1 (fr) * 2005-07-19 2007-01-25 Shinyoung Heavy Industries Co., Ltd. Appareil de reliquéfaction de gaz d’évaporats de gaz naturel liquéfié
WO2008066390A1 (fr) * 2006-11-28 2008-06-05 Moss Maritime As Regazification de gaz naturel liquéfié
JP2008309195A (ja) * 2007-06-12 2008-12-25 Tokyo Gas Co Ltd Ｌｎｇ貯蔵タンク内に発生するｂｏｇの再液化装置と再液化方法
JP2009191945A (ja) * 2008-02-14 2009-08-27 Ihi Corp 液化ガス貯蔵設備とその運転方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012165967A1 (fr) 2011-05-30 2012-12-06 Hamworthy Oil & Gas Systems As Utilisation de gaz naturel liquéfié utilisé pour un carburant pour liquéfier une ébullition de gaz de pétrole liquéfié
CN108870431A (zh) * 2017-05-12 2018-11-23 气体运输技术公司 用于冷却液化气体和/或其自然气化气体的装置和方法
CN108870431B (zh) * 2017-05-12 2022-10-04 气体运输技术公司 用于冷却液化气体和/或其自然气化气体的装置和方法

Also Published As

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NO332123B1 (no) 2012-07-02
NO20093356A1 (no) 2011-05-18

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