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RU2018110349A - System and method for processing gas obtained by evaporation of a cryogenic liquid - Google Patents

System and method for processing gas obtained by evaporation of a cryogenic liquid Download PDF

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RU2018110349A
RU2018110349A RU2018110349A RU2018110349A RU2018110349A RU 2018110349 A RU2018110349 A RU 2018110349A RU 2018110349 A RU2018110349 A RU 2018110349A RU 2018110349 A RU2018110349 A RU 2018110349A RU 2018110349 A RU2018110349 A RU 2018110349A
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gas
liquefaction
cryogenic liquid
compressor unit
heat exchanger
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RU2018110349A
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Russian (ru)
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RU2018110349A3 (en
RU2719258C2 (en
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Матиас РАГО
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Криостар Сас
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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
    • 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"
    • F25J1/0035—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by gas expansion with extraction of work
    • F25J1/0037—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by gas expansion with extraction of work of a return stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/004—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by flash gas recovery
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0201—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using only internal refrigeration means, i.e. without external refrigeration
    • F25J1/0202—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using only internal refrigeration means, i.e. without external refrigeration in a quasi-closed internal refrigeration loop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
    • F25J1/0229—Integration with a unit for using hydrocarbons, e.g. consuming hydrocarbons as feed stock
    • F25J1/023—Integration with a unit for using hydrocarbons, e.g. consuming hydrocarbons as feed stock for the combustion as fuels, i.e. integration with the fuel gas system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0244—Operation; Control and regulation; Instrumentation
    • F25J1/0245—Different modes, i.e. 'runs', of operation; Process control
    • F25J1/0247—Different modes, i.e. 'runs', of operation; Process control start-up of the process
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
    • F25J1/0275—Construction and layout of liquefaction equipments, e.g. valves, machines adapted for special use of the liquefaction unit, e.g. portable or transportable devices
    • F25J1/0277—Offshore use, e.g. during shipping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
    • F25J1/0285—Combination of different types of drivers mechanically coupled to the same refrigerant compressor, possibly split on multiple compressor casings
    • F25J1/0288—Combination of different types of drivers mechanically coupled to the same refrigerant compressor, possibly split on multiple compressor casings using work extraction by mechanical coupling of compression and expansion of the refrigerant, so-called companders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
    • F25J1/0292—Refrigerant compression by cold or cryogenic suction of the refrigerant gas
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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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)
  • Ocean & Marine Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Claims (23)

1. Система снабжения двигателя на основе газа, образующегося при испарении криогенной жидкости, и повторного сжижения этого газа, включающая линию снабжения по меньшей мере одного двигателя, на которой расположен первый компрессорный блок (3) для указанного газа, и отвод в возвратную линию, на которой последовательно расположены средства (10) охлаждения и первые средства (30) расширения, отличающаяся тем, что средства охлаждения включают последовательно расположенные второй компрессорный блок (11, 12, 13) и теплообменник (17), а также, ниже по потоку от второго компрессорного блока (11, 12, 13), отвод в контур (18, 20, 21), включающий вторые средства (14) расширения, причем контур повторно соединен с возвратной линией выше по потоку от второго компрессорного блока (11, 12, 13) после прохода через теплообменник (17) в направлении, противоположном направлению фракции газа, не отводимой через контур.1. A system for supplying an engine based on the gas generated by the evaporation of a cryogenic liquid and re-liquefying this gas, including a supply line for at least one engine on which the first compressor unit (3) for said gas is located, and a discharge to the return line, to which sequentially located cooling means (10) and first expansion means (30), characterized in that the cooling means include a second compressor unit (11, 12, 13) and a heat exchanger (17) arranged in series, as well as downstream from the second compressor unit (11, 12, 13), a tap into the circuit (18, 20, 21), including the second expansion means (14), the circuit being reconnected to the return line upstream of the second compressor unit (11, 12 , 13) after passing through the heat exchanger (17) in the direction opposite to the direction of the gas fraction that is not discharged through the circuit. 2. Система снабжения и повторного сжижения по п. 1, отличающаяся тем, что она включает линию (35) рециркуляции, обеспечивающую возможность подачи несжиженной фракции газа, выходящей из первых средств (30) расширения, в линию (2) снабжения двигателя выше по потоку от первого компрессорного блока (3).2. The supply and re-liquefaction system according to claim 1, characterized in that it includes a recirculation line (35) providing the possibility of supplying an un-liquefied gas fraction leaving the first expansion means (30) to the upstream engine supply line (2) from the first compressor unit (3). 3. Система снабжения и повторного сжижения по п. 2, отличающаяся тем, что линия (35) рециркуляции проходит через теплообменник (17).3. The supply and re-liquefaction system according to claim 2, characterized in that the recirculation line (35) passes through the heat exchanger (17). 4. Система снабжения и повторного сжижения по одному из пп. 1-3, отличающаяся тем, что отвод выполнен в пределах теплообменника (17).4. The supply system and re-liquefaction according to one of paragraphs. 1-3, characterized in that the tap is made within the heat exchanger (17). 5. Система снабжения и повторного сжижения по одному из пп. 1-4, отличающаяся тем, что первые средства расширения включают расширительный вентиль (30), выходящий в баллон (40), предназначенный для разделения полученной жидкости и несжиженной фракции газа.5. The supply system and re-liquefaction according to one of paragraphs. 1-4, characterized in that the first expansion means include an expansion valve (30), leaving the cylinder (40), designed to separate the resulting liquid and non-liquefied gas fraction. 6. Система снабжения и повторного сжижения по п. 5, отличающаяся тем, что верхняя часть баллона (40) соединена с теплообменником (17) таким образом, что газ, выходящий из баллона (40), поступает в теплообменник (17) с той же стороны, с которой расположен отвод, и нижняя часть баллона (40) соединена с цистерной (1) для криогенной жидкости.6. The supply and re-liquefaction system according to claim 5, characterized in that the upper part of the cylinder (40) is connected to the heat exchanger (17) so that the gas leaving the cylinder (40) enters the heat exchanger (17) with the same the side on which the outlet is located, and the lower part of the cylinder (40) is connected to the cryogenic liquid tank (1). 7. Система снабжения и повторного сжижения по одному из пп. 1-6, отличающаяся тем, что второй компрессорный блок включает несколько ступеней (11, 12, 13) сжатия, каждая из которых содержит компрессорное колесо, вторые средства расширения включают расширительную турбину (14), и каждое компрессорное колесо и расширительная турбина (14) соединены с одной и той же механической передачей (15).7. The supply system and re-liquefaction according to one of paragraphs. 1-6, characterized in that the second compressor unit includes several stages (11, 12, 13) of compression, each of which contains a compressor wheel, the second expansion means include an expansion turbine (14), and each compressor wheel and an expansion turbine (14) connected to the same mechanical transmission (15). 8. Система снабжения и повторного сжижения по одному из пп. 1-7, отличающаяся тем, что она дополнительно включает средства (62) введения газа в обводной контур цикла.8. The supply system and re-liquefaction according to one of paragraphs. 1-7, characterized in that it further includes means (62) for introducing gas into the loop loop. 9. Система снабжения и повторного сжижения по п. 8, отличающаяся тем, что средства (62) введения газа в обводной контур включают насос (60) для криогенной жидкости, испаритель (63) и регулировочный вентиль (64).9. The supply and re-liquefaction system according to claim 8, characterized in that the means (62) for introducing gas into the bypass circuit include a cryogenic liquid pump (60), an evaporator (63) and a control valve (64). 10. Система снабжения и повторного сжижения по одному из пп. 1-9, отличающаяся тем, что она дополнительно включает коллектор для извлечения испарившихся газов из комплекта цистерн (1) для криогенной жидкости, и коллектор соединен напрямую, иными словами, в частности, без промежуточного устройства для теплообмена с другой газовой трубой, с первым компрессорным блоком (3).10. The supply system and re-liquefaction according to one of paragraphs. 1-9, characterized in that it further includes a collector for extracting evaporated gases from the tank set (1) for cryogenic liquid, and the collector is connected directly, in other words, in particular, without an intermediate device for heat exchange with another gas pipe, with the first compressor block (3). 11. Судно для транспортировки криогенной жидкости, отличающееся тем, что оно включает систему снабжения и повторного сжижения по одному из пп. 1-10.11. A vessel for transporting cryogenic liquid, characterized in that it includes a supply system and re-liquefaction according to one of paragraphs. 1-10. 12. Судно по п. 11, отличающееся тем, что указанное судно является судном для перевозки метана.12. The ship under item 11, characterized in that the said ship is a ship for the transport of methane. 13. Способ управления потоком газа, образующегося при испарении криогенной жидкости, в котором:13. A method of controlling the flow of gas generated by the evaporation of a cryogenic liquid, in which: указанный поток газа сжимают в первом компрессорном блоке перед его подачей либо в двигатель, либо в средства повторного сжижения,said gas stream is compressed in the first compressor unit before it is supplied either to the engine or to the re-liquefaction means, фракцию газа, подаваемую в средства повторного сжижения, пропускают через средства (10) охлаждения и затем средства (30) расширения и, наконец, через сепаратор (40) из которого жидкую часть подают в цистерну (1) для криогенной жидкости,the gas fraction supplied to the re-liquefaction means is passed through cooling means (10) and then expansion means (30) and, finally, through a separator (40) from which the liquid part is supplied to the cryogenic liquid tank (1), отличающийся тем, что средства охлаждения представляют собой средства механического охлаждения, гдеcharacterized in that the cooling means are mechanical cooling means, where поток газа сжимают во втором компрессорном блоке (11, 12, 13), и затем охлаждают в теплообменнике (17), перед его расширением таким образом, что фракция газа повторно сжижается,the gas stream is compressed in a second compressor unit (11, 12, 13), and then cooled in a heat exchanger (17), before it is expanded so that the gas fraction is re-liquefied, после сжатия поток газа разделяют на первую часть потока газа и вторую часть потока газа,after compression, the gas stream is divided into the first part of the gas stream and the second part of the gas stream, первую часть потока газа охлаждают и затем подают в средства повторного сжижения для по меньшей мере частичного ее сжижения, иthe first part of the gas stream is cooled and then fed to the re-liquefaction means for at least partially liquefying it, and вторую часть потока газа подают в контур (18, 20, 21), в котором указанную вторую часть потока газа расширяют и затем используют для охлаждения первой части потока газа, перед повторным объединением потока газа для повторного сжатия во втором компрессорном блоке (11, 12, 13).the second part of the gas stream is fed to the circuit (18, 20, 21), in which the specified second part of the gas stream is expanded and then used to cool the first part of the gas stream, before re-combining the gas stream for re-compression in the second compressor unit (11, 12, 13). 14. Способ управления потоком газа, образующегося при испарении криогенной жидкости, по п. 13, отличающийся тем, что газ, поступающий из испарителя, сжимают без предварительного теплообмена с другой газовой трубой.14. The method of controlling the flow of gas generated during the evaporation of a cryogenic liquid according to claim 13, characterized in that the gas coming from the evaporator is compressed without prior heat exchange with another gas pipe. 15. Способ управления потоком газа, образующегося при испарении криогенной жидкости по п. 13 или 14, отличающийся тем, что несжиженный газ, поступающий из первых средств (30) расширения, направляют посредством линии (35) рециркуляции выше по потоку от первого компрессорного блока (3).15. A method of controlling the flow of gas generated by the evaporation of a cryogenic liquid according to claim 13 or 14, characterized in that the un-liquefied gas coming from the first expansion means (30) is sent via an upstream recirculation line (35) from the first compressor unit ( 3). 16. Способ управления потоком газа, образующегося при испарении криогенной жидкости, по п. 15, отличающийся тем, что несжиженный газ, поступающий из первых средств (30) расширения, пропускают через теплообменник (17) перед его повторным сжатием в первом компрессорном блоке (3).16. A method for controlling the flow of gas generated by the evaporation of a cryogenic liquid according to claim 15, characterized in that the un-liquefied gas coming from the first expansion means (30) is passed through a heat exchanger (17) before being re-compressed in the first compressor unit (3 )
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