US3857245A - Reliquefaction of boil off gas - Google Patents

Reliquefaction of boil off gas Download PDF

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Publication number
US3857245A
US3857245A US00381235A US38123573A US3857245A US 3857245 A US3857245 A US 3857245A US 00381235 A US00381235 A US 00381235A US 38123573 A US38123573 A US 38123573A US 3857245 A US3857245 A US 3857245A
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gas
boil
heat exchange
compressed
stream
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US00381235A
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J Jones
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Costain Petrocarbon Ltd
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0201—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using only internal refrigeration means, i.e. without external refrigeration
    • F25J1/0202—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using only internal refrigeration means, i.e. without external refrigeration in a quasi-closed internal refrigeration loop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022—Hydrocarbons, e.g. natural gas
    • F25J1/0025—Boil-off gases "BOG" from storages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/004—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by flash gas recovery
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—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"
    • F25J1/0045—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 vaporising a liquid return stream
    • 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
    • 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
    • F25J2220/00—Processes or apparatus involving steps for the removal of impurities
    • F25J2220/60—Separating impurities from natural gas, e.g. mercury, cyclic hydrocarbons
    • F25J2220/62—Separating low boiling components, e.g. He, H2, N2, Air
    • 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
    • F25J2235/00—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
    • F25J2235/60—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams the fluid being (a mixture of) hydrocarbons
    • 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
    • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/62—Details of storing a fluid in a tank

Definitions

  • Tankers carrying LNG and utilizing the boil-off gas to fuel the boilers generally include in their equipment one or more compressors for compressing the boiloff gas for feeding to the boilers, and a heater for raising the temperature of the boil-off gas from the compressors to ambient temperature.
  • the heater generally uses steam as the heating medium and in some cases the heating medium may be water.
  • the present invention provides a method of reliquefying a part, typically 30 percent, of the boil-off gas, which permits the utilization of these existing ship board facilities and in which the additional equipment required can be installed very simply.
  • the method of reliquefying a part of the boil-off gas comprises separating a portion of the boil-off gas stream that has been compressed for feeding to the ships boilers, further compressing said separated portion to a higher pressure, cooling said further compressed portion to condense it, the cooling being effected in part by utilising at least part of the sensible cold in the boil-off gas prior to compression and in part by cold obtained by expanding the condensate, and recovering reliquefied boil-off gas from the liquid fraction of the expanded condensate, and injecting liquefied natural gas into the boil-off prior to cooling the further compressed portion to condense it and/or recycling a portion of the condensate after expanding said portion to a pressure which is below the maximum pressure of the further compressed portion.
  • the fraction of the expanded condensate which remains after recovering reliquefied boil-off gas from said condensate can be used to fuel the ships boilers.
  • the injection of the LNG and recycling of the condensed gas each assist in increasing the proportion of the boil-off gas that can be reliquefied by the method.
  • all the sensible cold in the uncompressed boil-off gas between the temperature at which it boils of from the cargo and ambient temperature is used to assist in condensing the further compressed portion of boil-off gas.
  • the boil-off gas stream which is compressed for feeding the ship's boilers being above room temperature after compression instead of below. as would normally be the case where all the boiloff gas is used to fire the ship's boilers.
  • the heaters which are used to heat the compressed boiloff gas for feeding to the ships boilers utilise water as the heating medium, they may conveniently be used to cool the compressed boil-off gas instead.
  • the existing submerged liquid spray pumps designed to pump the LNG to high pressure for spraying into the cargo tanks, may be used to inject the LNG into the boil-off gas and the latent heat of vaporization and the sensible cold in the LNG may be used to supplement the sensible cold in the boil-off gas from the cargo and the cold obtained by expanding the subsequent condensate, in the cooling of the further compressed portion of the boil-off gas to condense it.
  • the additional equipment required for the method of the invention comprises supplementary compressor means for further compressing the portion of .compressed boil-off gas separated from the stream which has been compressed for feeding to the ships boilers, prime mover means for driving this compressor means, and a cold box including the heat exchange means for cooling and condensing the further compressed steam, one or more expansion valves and gas/liquid separator for separating the liquid from the gas in the expanded condensate.
  • the compressor means and its prime mover can be assembled on one skid and the cold box can be assembled on another skid for installation in the ship thereby reducing the amount of shipboard work required.
  • the LNG may be injected into the boil-off gas at any point prior to the cooling of the further compressed portion to effect condensation. However, it is preferred to inject it only into the separated portion of the compressed boil-off gas stream because otherwise the effect of the injection is diluted through the loss of a part of it as fuel to the ships boilers.
  • the supplementary compressor means is a multi-stage compressor
  • the LNG can be injected at any convenient stage of the multi-stage compressor.
  • the LNG for injection is evaporated and superheated, most suitably by heat exchange with the high pressure gas stream from the supplementary compressor means, before mixing with the separated boil-off gas.
  • the recycled material may be combined with the LNG for injection into the boil-off gas.
  • the LNG together with recycle material must be injected into the separated portion before said separated portion reaches its maximum pressure as a result of its further compression.
  • the LNG and the recycle' material may, singly or in combination, be divided into a plurality of streams which are injected into the separated portion of boil-off gas at a plurality of different pressure levels in order to reduce the energy required to compress the separated boil-off gas, LNG and recycle material.
  • At least a part of the power required for further compressing the separated portion of boil-off gas may be provided by a gas engine, e.g., a gas turbine, which is fuelled by part of the boil-off gas.
  • the fuel may be supplied from the non-liquid portion of the expanded condensate after recovery of the reliquefied boil-off gas, or from the compressed gas stream destined for the ships boilers, or by part of the gas compressed by the supplementary compressor or from a combination of two or more of these sources.
  • the power may be provided by other means, e.g., one or more electric motors or an engine fuelled bya hydrocarbon fuel other than boil-off gas.
  • the power may be provided by a steam turbine to which the supply of steam is that which otherwise would be used to heat the boil-off gas after its compression for feeding to the boilers, since duringthe periods when the reliquefaction plant is operating this heat will not be required.
  • reference numerals 1 indicate cargo tanks containing LNG; reference numeral 2 is a'submerged liquid spray pump generally found as existing equipment aboard an LNG tanker; 3 is the boil-off gas compressor and 4 is the heater for the compressed boil-off gas, both also generally found as existing equipment aboard LNG tankers. 7 is a heat exchanger; 8, 21 and 24 are expansion valves; 9 is a gas/liquid separator; 10 is a multi-stage compressor with inter-coolers 25 and after cooler 26, and 11 is a motor for driving the compressor 10.
  • the multi-stage compressor 10, motor 11, inter-coolers 25 and after-cooler 26 are mounted on a skid 6 while the heat exchanger 7, expansion valves 8 and 24 and separator 9 are mounted within an insulated enclosure carried on a second skid 5. This arrangement simplifies the installation of the equipment in the tanker and reduces the amount of ship-board assembly work that is required.
  • the cold boil-off gas passes from the tank header 12 through pipeline l3 and heatexchanger 7, in which it 'is warmed to near ambient temperature. Leaving the exchanger it passes through line 14 to the suction of the existing boil-off compressor 3 in which it is compressed to about 26 psia.
  • the gas then either passes through the heater 4 or by-passes this heater by means of pipeline 27, valve 28 and pipeline '29. If the heating medium for the heater 4 is water, the gas'may be passed through the heater which will now act as a cooler. if however, the heating medium is, steam, the heater will be by-passed. If desired, the by-pass may contain a water cooler, not
  • Liquid and vapor are separated in the separator 9.
  • the liquid is returned to the tanks through line 20, control valve 21 and line 22.
  • the vapor which will normally be rich in nitrogen, is returned through exchanger 7 and fed to the boilers through line 23.
  • the LNG will normally contain an appreciable quantity of nitrogen and that this nitrogen, as a result of its low boiling point compared with the other constituents of natural gas, will evaporate preferentially and form a very significant portion of the boil-off gas.
  • the boil-off gas of an LNG sample containing 1 percent nitrogen may contain as much as 25 percent nitrogen. The liquefaction of the boil-off gas will therefore require cooling to a very low temperature, so that without the injection of the LNG through line 18 the liquid will be only poorly sub-cooled in exchanger 7, resulting in heavy evaporation in valve 8 and a consequent low recovery of liquid.
  • the injection through line 18 of LNG which has a much lower nitrogen content than the boil-off gas, enables liquefaction of the combined stream to take place in a higher range of temperatures thus allowing the liquid to be more adequately sub-cooled, thereby reducing the evaporation occurring on expansion and increasing the LNG recovery.
  • the LNG may be'injected into the boil-off gas before stage 10a or before or after stage of the multi-state compressor.
  • alternative means of pressurising the LNG may have to be provided. It is important however, that the LNG is injected into the boil-off gas prior to the cooling of the boil-off gas in heat exchanger 7 to condense it.
  • the LNG may be combined with the boil-off gas in pipeline 12 or pipeline 14 provided that the capacity of compressor 3 is large enough to cope with the enlarged stream.
  • compressor 10 may be designed to provide the total required compression and may, if desired, be a single stage compressor or a multi-stage compressor having two compression stages or four or more compression stages, the three stages shown not being critical.
  • Improved recovery of LNG from the boil-off gas is achieved by diverting a portion of the stream of condensed gas upstream of expansion valve 8, through pipeline 30, expanding it through valve 24, and feeding it into LNG pipeline 17. Alternatively, it may be expanded toa still lower pressure and returned to line 12, 14 or 16, or expanded to the same or a higher pressure and returned as a separate stream to the inlet of the second or third stage of the compressor 10.
  • the LNG pump 2 and pipelines l7 and 18 are omitted and the portion of the stream of condensed gas that is diverted through pipeline 30 may be expanded through valve 24 and returned to pipelines 12, 14 or 16 or between the first and second or second and third stages of the multistage compressor 10.
  • the stream in pipeline 30 is returned to pipeline 16 or downstream thereof so that none is lost as fuel through pipeline 15.
  • the recycle is addi-. tional to the LNG injection, it is only convenient to feed the expanded condensate from the expansion valve 24 .into the LNG pipeline 17, as shown, when the LNG is injected into the boil-off gas at a pressure below the maximum pressure to which it is compressed; i.e.,
  • the boil-off gas By means of the method illustrated, about 30 percent of the boil-off gas can be reliquefied. The remainder may, as indicated, be passed to the ships boilers. Alternatively, however, a proportion of it may be used to fuel the motor 11 driving the compressor and for this purpose the motor may suitably be a gas turbine.
  • a method of reliquefying a part of the boil-off gas from a ships cargo of liquefied natural gas, which boiloff gas has been compressed for feeding as fuel to the ships motor comprising the steps of separating a portion of the boil-off gas stream that has been compressed for feeding to the ships boilers, further compressing said separated portion to a higher pressure, cooling said further compressed portion to condense it, the cooling being effected in part by utilizing at least part of the sensible cold in the boil-off gas prior to compression and in part by cold obtained by expanding the condensate, recovering reliquefied boil-off gas from the liquid fraction of the expanded condensate, and injecting liquefied natural'gas into the boil-off gas at a point before the further compressed portion is cooled to condense it.
  • the further compressed portion is cooled to condense it and a portion of the condensate is recycled after expansion to a pressure which is below the maximum pressure of the further compressed portion, wherein said portion of condensate is combined with said liquefied natural gas and the combined material is injected into the separated portion of the compressed boil-off gas stream before said separated portion reaches its maximum pressure as a result of said further compression.
  • a method as claimed in claim 1 in which at least a part of the power required for further compressing the separated portion of boil-off gas is provided by a gas engine which is fuelled by boil-off gas.
  • a method as claimed in claim 1 further comprising the step of recycling a portion of the condensate after expanding said portion to a pressure which is below the maximum pressure of the further compressed portion.
  • first conducting means for feeding boil-off from said cargo tank through said heat exchange means as a first coolant stream prior to feeding it to said first compressor means;
  • third conducting means for passing the further compressed boil-off gas from said second compressor means through said heat exchange means in indirect counter-current heat exchange relationship with said first coolant stream, said further compressed boil-off gas stream being cooled and condensed in said heat exchange means;
  • fourth conducting means for passing the cooled and condensed gas stream from said heat exchange means through said expansion valve means to expand same and thence to said gas/liquid separator means;
  • gas recovery means for recovering gas from said gas/liquid separator means and passing it as a second coolant stream through said heat exchange means in indirect countercurrent heat-exchange relationship with said further compressed gas stream;
  • injection means for injecting gas from said cargo tank into boil-off gas at a point before said boil-off gas is passed to said heat exchange means for cooling and condensing;
  • liquid recovery means for recovering liquid from said gas/liquid separator means and returning it as reliquefied boil-off gas to said cargo tank.
  • first conducting means for feeding boil-off gas from said cargotank through said heat exchange means as a first coolant stream prior to feeding it to said first compressor means;
  • third conducting means for passing the further compressed boil-off gas from said compressor means through said heat exchange means in indirect counter-current heat exchange relationship with said first coolant stream, said further compressed boil-off stream being cooled and condensed in said heat exchange means;
  • gas recovery means for recovering gas from said gas/liquid separator means and passing it as a second coolant stream through said heat exchange means in indirect counter-current heat-exchange relationship with said further compressed gas stream;
  • liquid recovery means for recovering liquid from said gas/liquid separator means and returning it as reliquefied boiloff gas to said cargo tank.
  • a method of reliquifying apart of the boil-off gas from a ship s cargo of liquified natural gas, which boiloff gas has been compressed for feeding as fuel to the ships motor comprising the steps of separating a portion of the boil-off stream that has been compressed for feeding to the ships boilers, further compressing said separated portion to a higher pressure, cooling said further compressed portion to condense it, the cooling being effected in part by utilizing at least part of the sensible cold in the boil-off gas prior to compression and in part by cold obtained by expanding the condensate, recovering reliquified boil-off gas from the liquid fraction of the expanded condensate, and recycling a portion of the condensate after expanding said portion to a pressure which is below the maximum pressure of the further compressed portion.
  • a method as claimed in claim 10 in which all the sensible cold in the uncompressed boil-off gas between the temperature at which it boils off from the cargo and ambient temperature is used in cooling of the further compressed portion of the boil-off gas to condense it.
  • a method as claimed in claim 10 in which at least a part of the power required for further compressing the separated portion of boil-off gas'is provided by a gas engine which is fuelled by boil-off gas.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
US00381235A 1973-06-27 1973-07-20 Reliquefaction of boil off gas Expired - Lifetime US3857245A (en)

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Application Number Priority Date Filing Date Title
GB3045573A GB1472533A (en) 1973-06-27 1973-06-27 Reliquefaction of boil-off gas from a ships cargo of liquefied natural gas

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JP (1) JPS5022771A (fr)
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Cited By (82)

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US4179896A (en) * 1976-07-13 1979-12-25 Daimler-Benz Aktiengesellschaft Stuttgart-Untertuerkheim Method of cooling the interior of motor vehicles (powered at least partly by hydrogen)
US4249387A (en) * 1979-06-27 1981-02-10 Phillips Petroleum Company Refrigeration of liquefied petroleum gas storage with retention of light ends
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US4675037A (en) * 1986-02-18 1987-06-23 Air Products And Chemicals, Inc. Apparatus and method for recovering liquefied natural gas vapor boiloff by reliquefying during startup or turndown
US4727723A (en) * 1987-06-24 1988-03-01 The M. W. Kellogg Company Method for sub-cooling a normally gaseous hydrocarbon mixture
US4846862A (en) * 1988-09-06 1989-07-11 Air Products And Chemicals, Inc. Reliquefaction of boil-off from liquefied natural gas
US5129599A (en) * 1990-05-25 1992-07-14 General Dynamics Corporation, Space Systems Division Hybrid liquid-vapor propellant feed system for aerospace vehicles
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WO1998059206A1 (fr) * 1997-06-20 1998-12-30 Exxon Production Research Company Procede ameliore de refrigeration a constituants multiples pour liquefier du gaz naturel
EP1046858A1 (fr) * 1999-04-20 2000-10-25 Gaz De France Procédé et dispositif de maintien en froid de réservoirs de stockage ou de transport d'un gaz liquéfié
US6192705B1 (en) 1998-10-23 2001-02-27 Exxonmobil Upstream Research Company Reliquefaction of pressurized boil-off from pressurized liquid natural gas
US6237364B1 (en) 1999-01-15 2001-05-29 Exxonmobil Upstream Research Company Process for producing a pressurized methane-rich liquid from a methane-rich gas
US6449983B2 (en) 2000-03-09 2002-09-17 The Boc Group, Inc. Reliquefaction of compressed vapor
US6460350B2 (en) * 2000-02-03 2002-10-08 Tractebel Lng North America Llc Vapor recovery system using turboexpander-driven compressor
US6530241B2 (en) 2000-01-26 2003-03-11 Cryostar-France Sa Apparatus for reliquefying compressed vapour
US6672104B2 (en) 2002-03-28 2004-01-06 Exxonmobil Upstream Research Company Reliquefaction of boil-off from liquefied natural gas
US20040068993A1 (en) * 1999-11-05 2004-04-15 Toshikazu Irie Device and method for pressure control of cargo tank of liquefied natural gas carrier
US6745576B1 (en) * 2003-01-17 2004-06-08 Darron Granger Natural gas vapor recondenser system
WO2005045337A1 (fr) * 2003-11-03 2005-05-19 Fluor Technologies Corporation Configurations et procedes de gestion de vapeur de gnl
US20060053806A1 (en) * 2004-09-13 2006-03-16 Argent Marine Operations, Inc. System and process for transporting LNG by non-self-propelled marine LNG carrier
KR100699163B1 (ko) 2005-11-17 2007-03-23 신영중공업주식회사 Ｌｎｇ ｂｏｇ의 재액화 장치 및 재액화 방법
US20070204650A1 (en) * 2006-03-01 2007-09-06 Cirucci John F Self-contained distillation purifier/superheater for liquid-fill product container and delivery systems
US20070214806A1 (en) * 2006-03-15 2007-09-20 Solomon Aladja Faka Continuous Regasification of LNG Using Ambient Air
US20070214804A1 (en) * 2006-03-15 2007-09-20 Robert John Hannan Onboard Regasification of LNG
US20070214805A1 (en) * 2006-03-15 2007-09-20 Macmillan Adrian Armstrong Onboard Regasification of LNG Using Ambient Air
WO2007117148A1 (fr) * 2006-04-07 2007-10-18 Hamworthy Gas Systems As Procédé et appareil permettant de préchauffer un gaz naturel liquéfié d'évaporation à la température ambiante avant sa compression dans un système de reliquéfaction
US20080008602A1 (en) * 2004-01-16 2008-01-10 The Boc Group Plc Compressor
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