KR20140075582A - Reliquefaction System And Method For Boiled-Off Gas - Google Patents

Reliquefaction System And Method For Boiled-Off Gas Download PDF

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KR20140075582A
KR20140075582A KR1020130127271A KR20130127271A KR20140075582A KR 20140075582 A KR20140075582 A KR 20140075582A KR 1020130127271 A KR1020130127271 A KR 1020130127271A KR 20130127271 A KR20130127271 A KR 20130127271A KR 20140075582 A KR20140075582 A KR 20140075582A
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South Korea
Prior art keywords
gas
compressed
heat
compressor
storage tank
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KR1020130127271A
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Korean (ko)
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KR101707501B1 (en
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정인돈
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대우조선해양 주식회사
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Priority claimed from KR1020120143522A external-priority patent/KR20130139150A/en
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Publication of KR20140075582A publication Critical patent/KR20140075582A/en
Priority claimed from KR1020160101398A external-priority patent/KR20160099522A/en
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Publication of KR101707501B1 publication Critical patent/KR101707501B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • 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
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied 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
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F17C7/02—Discharging liquefied gases
    • F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • 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
    • F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
    • F25J1/008—Hydrocarbons
    • F25J1/0082—Methane
    • 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
    • F25J1/0201—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
    • F25J1/0243—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
    • 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
    • F25J1/0248—Stopping of the process, e.g. defrosting or deriming, maintenance; Back-up mode or systems
    • 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
    • F25J1/0272—Multiple identical heat exchangers in parallel
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
    • B63J2/12—Heating; 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
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/12—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures
    • 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
    • F17C2265/06—Fluid distribution
    • F17C2265/066—Fluid distribution for feeding engines for propulsion
    • 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
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/24—Processes or apparatus using other separation and/or other processing means using regenerators, cold accumulators or reversible heat exchangers
    • 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
    • F25J2215/00—Processes characterised by the type or other details of the product stream
    • F25J2215/60—Methane
    • 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
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S220/00—Receptacles
    • Y10S220/901—Liquified gas content, cryogenic

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (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

Disclosed are a system and a method for re-liquefying evaporated gas. The system for re-liquefying evaporated gas according to the present invention comprises a compressor for compressing evaporated gas generated by a storage tank arranged on a ship or a marine structure; multiple heat exchangers for heat-exchanging evaporated gas compressed by the compressor with evaporated gas to be introduced to the compressor; and an expansion unit for adiabatically expanding the compressed evaporated gas which has been heat-exchanged in the multiple heat exchangers. The multiple heat exchangers are arranged in a parallel manner to allow the evaporated gas compressed by the compressor to dispersedly flow into the multiple heat exchangers.

Description

증발가스 재액화 시스템 및 방법{Reliquefaction System And Method For Boiled-Off Gas}BACKGROUND OF THE INVENTION 1. Field of the Invention [0002]

본 발명은 증발가스 재액화 시스템 및 방법에 관한 것으로, 더욱 상세하게는 저장탱크에서 발생하는 증발가스를 컴프레서로 압축하고 이를 분기하여, 병렬로 마련된 복수의 열교환기에서 컴프레서 도입 전의 증발가스와 열교환시킨 후, 팽창 수단으로 단열팽창시켜 증발가스를 재액화하는 증발가스 재액화 시스템에 관한 것이다.More particularly, the present invention relates to a system and method for re-liquefying an evaporation gas, and more particularly, to a system and method for re-liquefying an evaporation gas, To an evaporation gas re-liquefaction system for re-liquefying the evaporation gas by thermal expansion by means of an expansion means.

액화천연가스(Liquefied Natural Gas, 이하 "LNG"라 함)는 메탄(methane)을 주성분으로 하는 천연가스를 약 -162℃로 냉각해서 액화시킴으로써 얻을 수 있는 무색투명한 액체로서, 천연가스와 비교해 약 1/600 정도의 부피를 갖는다. 따라서, 천연가스 이송 시 LNG로 액화시켜 이송할 경우 매우 효율적으로 이송할 수 있으며, 일 예로 LNG를 해상으로 수송(운반)할 수 있는 LNG 운반선이 사용되고 있다. Liquefied natural gas (hereinafter referred to as "LNG") is a colorless transparent liquid obtained by cooling methane-based natural gas to about -162 ° C. and liquefying it. / 600. ≪ / RTI > Therefore, it is very efficient to transport liquefied LNG when transporting natural gas. For example, an LNG carrier that can transport (transport) LNG is used.

천연가스의 액화온도는 상압 -163℃의 극저온이므로, LNG는 그 온도가 상압 -163℃ 보다 약간만 높아도 쉽게 증발된다. LNG 운반선의 LNG 저장탱크의 경우 단열처리가 되어 있기는 하지만, 외부의 열이 LNG 저장탱크에 지속적으로 전달되므로, LNG 운반선에 의한 LNG 수송과정에서 LNG가 LNG 저장탱크 내에서 지속적으로 자연 기화되어 LNG 저장 탱크 내에 증발가스(Boil-Off Gas, BOG)가 발생한다.Since the liquefaction temperature of natural gas is a cryogenic temperature of -163 ° C at normal pressure, LNG is easily evaporated even if its temperature is slightly higher than the normal pressure of -163 ° C. LNG storage tanks of LNG carriers are heat-treated, but since external heat is continuously transferred to LNG storage tanks, LNG is constantly spontaneously vaporized in LNG storage tanks during LNG transportation by LNG carrier, Boil-off gas (BOG) is generated in the storage tank.

BOG는 일종의 LNG 손실로서 LNG의 수송효율에 있어서 중요한 문제이며, LNG 저장탱크 내에 증발가스가 축적되면 LNG 저장탱크 내의 압력이 과도하게 상승하여 탱크가 파손될 위험이 있으므로, LNG 저장탱크 내에서 발생하는 BOG를 처리하기 위한 다양한 방법이 연구되고 있다.BOG is a kind of LNG loss, which is an important problem in the transport efficiency of LNG. When the evaporation gas accumulates in the LNG storage tank, the pressure in the LNG storage tank is excessively increased, Have been studied.

최근에는 BOG의 처리를 위해, BOG를 재액화하여 저장탱크로 복귀시키는 방법, BOG를 선박의 엔진의 에너지원으로 사용하는 방법 등이 사용되고 있다. 그리고 잉여의 BOG에 대해서는 가스연소유닛(Gas Combustion Unit, GCU)에서 연소시키는 방법을 사용하고 있다.Recently, for the treatment of BOG, BOG is re-liquefied and returned to the storage tank, and BOG is used as energy source of engine of ship. In addition, the surplus BOG is combusted in a gas combustion unit (GCU).

가스연소유닛은 BOG를 달리 활용할 데가 없는 경우 저장탱크의 압력 조절을 위하여 불가피하게 잉여의 BOG를 연소하는 것으로서, BOG가 가지고 있는 화학 에너지를 연소에 의해 낭비하는 결과를 초래한다는 문제가 있다.The gas combustion unit burns surplus BOG inevitably for controlling the pressure of the storage tank when the BOG can not be utilized otherwise, resulting in a waste of the chemical energy possessed by the BOG by combustion.

LNG 운반선의 추진 시스템에서 메인 추진 장치로서 이중 연료 연소(Dual Fuel, DF) 엔진을 적용하는 경우, LNG 저장탱크 내에서 발생하는 증발가스를 DF 엔진의 연료로서 사용하여 증발가스를 처리할 수 있는데, LNG 저장탱크 내에서 발생하는 증발가스의 양이 DF 엔진에서 선박의 추진에 사용되는 연료의 양을 초과하는 경우에, LNG 저장탱크를 보호하기 위해 증발가스를 가스 연소기로 보내어서 소각시키기도 한다.When a dual fuel (DF) engine is applied as the main propulsion unit in the propulsion system of the LNG carriers, the evaporative gas generated in the LNG storage tank can be used as the fuel of the DF engine to process the evaporative gas, If the amount of evaporative gas generated in the LNG storage tank exceeds the amount of fuel used in the propulsion of the ship in the DF engine, the evaporation gas may be sent to a gas burner to incinerate it to protect the LNG storage tank.

출원번호 제10-2010-0116987호Application No. 10-2010-0116987

극저온인 LNG는 온도 등 외부 환경 변화에 매우 민감하며, 선박의 운항중에도 화물창 내에서 지속적으로 자연 기화되기 때문에 상당한 양의 BOG(Boil Off Gas, 증발가스)가 발생한다. 저장 용기 내부에 BOG가 과다하게 되면 이로 인해 용기 내 압력이 상승하면서 용기가 내부 압력을 견딜 수 없어 폭발할 위험이 있으므로, BOG는 배출시켜 액화한 후 다시 저장하거나, 연소시켜 제거하는 방식으로 처리하게 된다. 선박으로 운송할 경우 단열 구조를 갖추더라도, 저장 용기 내에서 발생하는 증발가스(BOG)의 양은 약 0.05 vol%/day에 이르며, 종래 액화천연가스 운반선의 운항시 시간당 4 내지 6 톤(t), 한번 운항시 약 300톤의 액화천연가스가 증발가스화되는 것으로 알려진다.Cryogenic LNG is very sensitive to changes in the external environment such as temperature, and since it is continuously vaporized in the cargo hold during the operation of the ship, a considerable amount of BOG (boil off gas, evaporation gas) is generated. As the BOG becomes excessive in the storage container, the pressure in the container rises and the container can not withstand the internal pressure and there is a danger of explosion. Therefore, the BOG is discharged and liquefied and then stored or burned and removed do. The amount of evaporative gas (BOG) generated in the storage vessel is about 0.05 vol% / day even when the vessel is equipped with a heat insulating structure. The conventional liquefied natural gas carrier carries 4 to 6 tons / It is known that about 300 tons of liquefied natural gas is vaporized and gasified in a single operation.

증발가스의 재액화를 위해서는, 저장탱크 내부의 증발가스를 저장탱크 외부로 배출시켜 냉동 사이클을 포함한 재액화 장치를 통해 재액화시키는 방법이 이용되는데, 이때 증발가스는 초저온으로 냉각된 냉매, 예를 들어 질소, 혼합냉매 등과의 열교환을 통해 재액화된 후 저장탱크로 복귀된다. 이와 같은 냉동 사이클을 통한 재액화 장치는 운전의 복잡성으로 인해 전체 시스템 제어가 복잡하고, 많은 동력이 소모되는 문제가 있었다.In order to re-liquefy the evaporation gas, the evaporation gas in the storage tank is discharged to the outside of the storage tank and re-liquefied through the re-liquefaction device including the refrigeration cycle. At this time, the evaporation gas is cooled by the ultra- Nitrogen, mixed refrigerant, and the like, and then returned to the storage tank. In such a re-liquefying apparatus through a refrigeration cycle, the entire system control is complicated due to the complexity of operation, and there is a problem that a lot of power is consumed.

이처럼 많은 양의 BOG를 액화시키는 데에는 복잡한 재액화 장치와 많은 에너지를 필요로 하며, 연소시켜 제거하는 경우 연료를 사용하지 못하고 버리게 되는 등의 문제로 인해, 저장탱크로부터 발생하는 증발가스를 효율적으로 처리하기 위한 시스템이 필요하다. In order to liquefy such a large amount of BOG, a complicated re-liquefying device and a large amount of energy are required. In the case of burning and removing the fuel, the fuel can not be used and is discarded. A system is required.

본 발명은 이러한 문제를 해결하기 위한 것으로, 선박의 화물창에서 발생하는 증발가스를 효율적으로 재액화시킬 수 있는 시스템 및 방법을 제공하고자 한다.SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a system and a method for efficiently re-liquefying evaporative gas generated in a cargo hold of a ship.

본 발명의 일 측면에 따르면, 선박 또는 해양 구조물에 마련된 저장탱크에서 발생하는 증발가스를 압축하는 컴프레서; According to an aspect of the present invention, there is provided a compressor for compressing evaporative gas generated in a storage tank provided in a ship or an offshore structure;

상기 컴프레서에서 압축된 증발가스가 상기 컴프레서로 도입될 증발가스와 열교환되는 복수의 열교환기; 및A plurality of heat exchangers in which the evaporated gas compressed in the compressor is heat-exchanged with the evaporated gas to be introduced into the compressor; And

상기 복수의 열교환기에서 열교환된 상기 압축된 증발가스가 단열팽창되는 팽창 수단을 포함하되, And expansion means in which the compressed evaporated gas heat-exchanged in the plurality of heat exchangers undergoes thermal expansion,

상기 복수의 열교환기는 병렬로 마련되어, 상기 컴프레서에서 압축된 증발가스는 상기 컴프레서의 후단에서 분기되어 상기 복수의 열교환기로 도입될 수 있다. The plurality of heat exchangers are provided in parallel so that the evaporated gas compressed by the compressor can be branched at the rear end of the compressor and introduced into the plurality of heat exchangers.

바람직하게는, 상기 팽창 수단을 거쳐 단열팽창된 상기 증발가스를 기액분리하는 기액분리기를 더 포함하여, 상기 기액분리기에서 분리된 액화천연가스는 상기 저장탱크로 회수되고, 분리된 기체는 상기 저장탱크에서 발생한 상기 증발가스와 함께 상기 복수의 열교환기로 도입될 수 있다. Preferably, the system further comprises a gas-liquid separator for gas-liquid separating the vaporized gas that has been thermally expanded through the expansion means, wherein the liquefied natural gas separated from the gas-liquid separator is recovered to the storage tank, May be introduced into the plurality of heat exchangers together with the evaporated gas generated in the heat exchanger.

바람직하게는, 상기 복수의 열교환기 각각의 전단 및 후단에는 상기 압축된 증발가스 또는 상기 증발가스의 압력을 감지하는 압력 센서가 마련되고, 상기 복수의 열교환기 각각의 전단 및 후단에는 차단 밸브가 마련될 수 있다.Preferably, a pressure sensor for sensing the pressure of the compressed evaporated gas or the evaporated gas is provided at the front end and the rear end of each of the plurality of heat exchangers, and a shutoff valve is provided at the front end and the rear end of each of the plurality of heat exchangers .

바람직하게는, 상기 열교환기는 PCHE(Printed Circuit Heat Exchanger)이고,상기 압력 센서에서 감지된 상기 압축된 증발가스 또는 상기 증발가스의 열교환기 전단 및 후단의 압력차이로 상기 열교환기의 관로 막힘을 확인하여, 상기 차단 밸브로 상기 열교환기를 개폐할 수 있다. Preferably, the heat exchanger is a Printed Circuit Heat Exchanger (PCHE), and the clogging of the pipe of the heat exchanger is checked by the pressure difference between the compressed evaporative gas detected by the pressure sensor or the evaporated gas at the front end and the rear end of the heat exchanger , And the heat exchanger can be opened and closed by the shutoff valve.

바람직하게는, 상기 컴프레서에서 상기 증발가스는 150 내지 400 bar의 압력으로 압축되고, 상기 컴프레서에서 압축된 상기 증발가스 중 적어도 일부는 상기 선박 또는 해양 구조물의 엔진 연료로 공급될 수 있다.Preferably, in the compressor, the evaporation gas is compressed to a pressure of 150 to 400 bar, and at least a portion of the evaporation gas compressed in the compressor may be supplied to the engine fuel of the vessel or offshore structure.

바람직하게는, 상기 팽창 수단은 감압 밸브 및 팽창기(expander)를 포함할 수 있다.
Advantageously, the expansion means may comprise a pressure reducing valve and an expander.

본 발명의 다른 측면에 따르면, 1) 선박 또는 해양 구조물의 저장탱크에서 발생하는 증발가스를 압축하는 단계; According to another aspect of the present invention, there is provided a method of manufacturing a vessel, comprising the steps of: 1) compressing evaporative gas generated in a storage tank of a ship or an offshore structure;

2) 압축된 증발가스를 분기하고 병렬로 마련된 복수의 열교환기로 도입시켜, 상기 저장탱크에서 발생한 압축 전의 증발가스와 열교환시키는 단계; 및2) introducing the compressed evaporated gas into a plurality of heat exchangers provided in parallel to heat-exchange the evaporated gas before compression generated in the storage tank; And

3) 열교환된 상기 증발가스를 단열팽창시키고 기액분리하는 단계를 포함하는 증발가스의 재액화 방법이 제공된다. 3) a step of thermally expanding the vaporized gas heat-exchanged and subjecting it to gas-liquid separation, is provided.

본 발명의 증발가스 재액화 시스템은, 복수의 열교환기를 병렬로 마련하여, 컴프레서에서 압축된 증발가스를 분기하여 복수의 열교환기로 도입시켜 컴프레서로 도입되기 전의 증발가스와 열교환시키고, 단열팽창을 거쳐 재액화시킨다. 이와 같이 저장탱크에서 발생하는 증발가스 자체의 냉열을 이용하여 증발가스를 재액화시킬 수 있도록 시스템을 구성하여, 별도의 냉매 시스템을 필요로 하지 않으므로, 초기 설치비 부담과 설비 규모를 줄일 수 있고, 유지보수도 편리해진다. The evaporation gas re-liquefaction system of the present invention comprises a plurality of heat exchangers provided in parallel to divide the compressed evaporated gas into a plurality of heat exchangers for heat exchange with the evaporated gas before being introduced into the compressor, Liquefied. Since the system is configured to re-liquefy the evaporation gas by using the cooling and heating of the evaporation gas itself generated in the storage tank, a separate refrigerant system is not required, so that the initial installation cost and equipment size can be reduced, Maintenance becomes convenient.

또한, 재액화를 위해 많은 에너지를 소모하는 재액화 장치를 설치하지 않음으로써 재액화를 위한 장치의 구동 비용을 절감하며, 효과적인 재액화를 통해 연소 등으로 낭비되는 천연가스량을 줄일 수 있어 경제성을 높일 수 있다.In addition, by not providing a re-liquefaction device consuming a large amount of energy for re-liquefaction, it is possible to reduce the driving cost of the device for re-liquefaction and reduce the amount of natural gas wasted by combustion etc. through effective re- .

병렬로 마련된 복수의 열교환기를 통해 열교환시킴으로써 열교환기 중 일부의 관로가 막히거나 장비 교체, 또는 점검 등이 필요한 때에도 나머지 열교환기를 통해 재액화 공정을 수행하여, 저장탱크에서 발생하는 증발가스를 지속적으로 처리할 수 있다.By exchanging heat through a plurality of heat exchangers provided in parallel, it is possible to perform a re-liquefaction process through the remaining heat exchanger even when some of the heat exchangers are blocked, equipment replacement, or inspection is required, and the evaporation gas generated in the storage tank is continuously treated can do.

도 1은 본 발명의 일 실시예에 따른 증발가스 재액화 시스템을 개략적으로 도시한다.
도 2는 본 발명의 다른 실시예에 따른 증발가스 재액화 시스템을 개략적으로 도시한다.
도 3은 본 발명에 적용될 수 있는 열교환기의 일 예를 개략적으로 도시한다.
도 4는 본 발명의 실시예들에서의 증발가스 재액화가 이루어지는 개략적인 경로를 도시한 P-H 선도이다. Figure 1 schematically depicts an evaporative gas re-liquefaction system in accordance with one embodiment of the present invention.
2 schematically shows a vaporization gas remelting system according to another embodiment of the present invention.
FIG. 3 schematically shows an example of a heat exchanger applicable to the present invention.
FIG. 4 is a PH diagram showing a schematic route through which evaporative gas re-injection is performed in the embodiments of the present invention. FIG.

본 발명과 본 발명의 동작상의 이점 및 본 발명의 실시에 의하여 달성되는 목적을 충분히 이해하기 위해서는 본 발명의 바람직한 실시 예를 예시하는 첨부 도면 및 첨부 도면에 기재된 내용을 참조하여야만 한다.In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시 예를 설명함으로써, 본 발명을 상세히 설명한다. 각 도면에 제시된 동일한 참조부호는 동일한 부재를 나타낸다.
Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

도 1에는 본 발명의 일 실시예에 따른 해상 구조물에서의 증발가스 처리 시스템의 개략 구성도가 도시되어 있다.FIG. 1 is a schematic block diagram of an evaporative gas treatment system in a marine structure according to an embodiment of the present invention.

도 1에는, 천연가스를 연료로 사용할 수 있는 고압 천연가스 분사 엔진, 즉 ME-GI 엔진을 설치한 LNG 운반선에 본 발명의 증발가스 처리 시스템이 적용된 예가 도시되어 있지만, 본 발명의 후술할 증발가스 처리를 위한 시스템은 액화가스 저장탱크가 설치된 모든 종류의 해상 구조물, 즉 LNG 운반선, LNG RV와 같은 선박을 비롯하여, LNG FPSO, LNG FSRU와 같은 해상 플랜트에 적용될 수 있다.1 shows an example in which the evaporative gas treatment system of the present invention is applied to a high-pressure natural gas injection engine capable of using natural gas as fuel, that is, an LNG carrier equipped with an ME-GI engine. However, The system for the treatment can be applied to all types of offshore structures equipped with liquefied gas storage tanks, namely LNG carriers, vessels such as LNG RV, marine plants such as LNG FPSO, LNG FSRU.

본 발명에 따른, 해상 구조물의 증발가스 처리 시스템에 따르면, 액화가스를 저장하는 저장탱크(11)에서 발생되어 배출된 증발가스(NBOG)는, 증발가스 공급라인(L1)을 따라 이송되어 증발가스 압축부(13)에서 압축된 후 고압 천연가스 분사 엔진, 예컨대 ME-GI 엔진에 공급된다. 증발가스는 증발가스 압축부(13)에 의해 대략 150 내지 300 bara 정도의 고압으로 압축된 후 고압 천연가스 분사 엔진, 예컨대 ME-GI 엔진에 연료로서 공급된다.According to the evaporative gas processing system of the offshore structure according to the present invention, the evaporation gas (NBOG) generated and discharged from the storage tank (11) storing the liquefied gas is transferred along the evaporation gas supply line (L1) Compressed by the compression unit 13, and then supplied to a high-pressure natural gas injection engine, such as an ME-GI engine. The evaporation gas is compressed to a high pressure of about 150 to 300 bara by the evaporation gas compression unit 13 and then supplied as fuel to a high pressure natural gas injection engine such as an ME-GI engine.

저장탱크는 LNG 등의 액화가스를 극저온 상태로 저장할 수 있도록 밀봉 및 단열 방벽을 갖추고 있지만, 외부로부터 전달되는 열을 완벽하게 차단할 수는 없다. 그에 따라 저장탱크(11) 내에서는 액화가스의 증발이 지속적으로 이루어지며, 증발가스의 압력을 적정한 수준으로 유지하기 위해 증발가스 배출라인(L1)을 통하여 저장탱크(11) 내부의 증발가스를 배출시킨다.The storage tank has a sealing and thermal barrier to store liquefied gases such as LNG in cryogenic conditions, but it can not completely block the heat transmitted from the outside. Accordingly, the evaporation of the liquefied gas is continuously performed in the storage tank 11, and the evaporation gas in the storage tank 11 is discharged through the evaporation gas discharge line L1 to maintain the pressure of the evaporation gas at an appropriate level .

저장탱크(11)의 내부에는 필요시 LNG를 저장탱크의 외부로 배출시키기 위해 배출 펌프(12)가 설치된다.A discharge pump (12) is installed in the storage tank (11) to discharge the LNG to the outside of the storage tank, if necessary.

증발가스 압축부(13)는 하나 이상의 증발가스 압축기(14)와, 이 증발가스 압축기(14)에서 압축되면서 온도가 상승한 증발가스를 냉각시키기 위한 하나 이상의 중간 냉각기(15)를 포함할 수 있다. 도 1에서는 5개의 증발가스 압축기(14)와 5개의 중간 냉각기(15)를 포함하는 다단 압축의 증발가스 압축부(13)가 예시되어 있다. 증발가스 압축부(13)는 예를 들어 증발가스를 약 301 bara까지 압축하도록 구성될 수 있다.The evaporative gas compression section 13 may include at least one evaporative gas compressor 14 and at least one intermediate cooler 15 for cooling the evaporated gas whose temperature has increased while being compressed in the evaporative gas compressor 14. In Fig. 1, there is illustrated a multi-stage compressed evaporative gas compression section 13 including five evaporative gas compressors 14 and five intermediate coolers 15. The evaporation gas compression section 13 can be configured, for example, to compress the evaporation gas to about 301 bara.

증발가스 압축부(13)에서 압축된 증발가스는 증발가스 공급라인(L1)을 통하여 고압 천연가스 분사 엔진에 공급되는데, 고압 천연가스 분사 엔진에서 필요로 하는 연료의 필요량에 따라 압축된 증발가스 전부를 고압 천연가스 분사 엔진에 공급할 수도 있다. 또한, 본 발명에 따르면, 저장탱크(11)로부터 배출되어 증발가스 압축부(13)에서 압축된 증발가스를 제1 스트림이라 할 때, 압축된 증발가스의 제1 스트림을 제2 스트림과 제3 스트림으로 나누어, 제2 스트림은 고압 천연가스 분사 엔진에 연료로서 공급하고 제3 스트림은 액화시켜 저장탱크로 복귀시키도록 구성할 수 있다.The compressed gas is supplied to the high-pressure natural gas injection engine through an evaporation gas supply line (L1). The compressed gas is supplied to the high-pressure natural gas injection engine To the high-pressure natural gas injection engine. According to the present invention, when the evaporated gas discharged from the storage tank 11 and compressed by the evaporated gas compression unit 13 is referred to as a first stream, the first stream of the compressed evaporated gas is divided into the second stream and the third stream Stream, the second stream is supplied as fuel to the high pressure natural gas injection engine, and the third stream is liquefied and returned to the storage tank.

이때, 제2 스트립은 증발가스 공급라인(L1)을 통해 고압 천연가스 분사 엔진에 공급되고, 제3 스트림은 증발가스 복귀라인(L3)을 통해 저장탱크(11)로 복귀된다. 압축된 증발가스의 제3 스트림을 액화시킬 수 있도록 증발가스 복귀라인(L3)에는 열교환기(21)가 설치된다. 열교환기(21)에서는 압축된 증발가스의 제3 스트림을 저장탱크(11)로부터 배출된 후 증발가스 압축부(13)로 공급되는 증발가스와 열교환시킨다.At this time, the second strip is supplied to the high-pressure natural gas injection engine through the evaporation gas supply line (L1), and the third stream is returned to the storage tank (11) through the evaporation gas return line (L3). A heat exchanger (21) is installed in the evaporation gas return line (L3) so that the third stream of the compressed evaporation gas can be liquefied. In the heat exchanger (21), the third stream of the compressed evaporated gas is discharged from the storage tank (11), and then heat-exchanged with the evaporated gas supplied to the evaporated gas compression unit (13).

압축되기 전의 증발가스의 제1 스트림의 유량이 제3 스트림의 유량보다 많기 때문에, 압축된 증발가스의 제3 스트림은 압축되기 전의 증발가스의 제1 스트림으로부터 냉열을 공급받아 액화될 수 있다. 이와 같이 열교환기(21)에서는 저장탱크(11)로부터 배출된 직후의 극저온의 증발가스와 증발가스 압축부(13)에서 압축된 고압 상태의 증발가스를 열교환시켜 이 고압 상태의 증발가스를 액화시킨다.Because the flow rate of the first stream of evaporated gas before being compressed is greater than the flow rate of the third stream, the third stream of compressed evaporated gas may be liquefied by receiving cold heat from the first stream of evaporated gas before being compressed. As described above, in the heat exchanger 21, the extremely low-temperature evaporation gas immediately after being discharged from the storage tank 11 is exchanged with the high-pressure evaporation gas compressed by the evaporation gas compression unit 13 to liquefy the evaporation gas at the high pressure state .

열교환기(21)에서 액화된 증발가스(LBOG)는 팽창밸브(22)를 통과하면서 감압되어 기액 혼합상태로 기액분리기(23)에 공급된다. 팽창밸브(22)를 통과하면서 LBOG는 대략 상압으로 감압될 수 있다. 액화된 증발가스는 기액분리기(23)에서 기체와 액체 성분이 분리되어, 액체성분, 즉 LNG는 증발가스 복귀라인(L3)을 통해 저장탱크(11)로 이송되고, 기체성분, 즉 증발가스는 증발가스 재순환라인(L5)을 통해 저장탱크(11)로부터 배출되어 증발가스 압축부(13)로 공급되는 증발가스에 합류된다. 더욱 상세하게는, 증발가스 재순환라인(L5)은 기액분리기(23)의 상단으로부터 연장되어 증발가스 공급라인(L1)에서 열교환기(21)보다 상류측에 연결된다.The evaporated gas LBOG liquefied in the heat exchanger 21 is reduced in pressure while passing through the expansion valve 22 and supplied to the gas-liquid separator 23 in a vapor-liquid mixed state. The LBOG can be decompressed to approximately atmospheric pressure while passing through the expansion valve 22. The liquefied evaporated gas is separated from the gas and liquid components in the gas-liquid separator 23, and the liquid component, that is, the LNG is transferred to the storage tank 11 through the evaporated gas return line L3, and the gas component, And is merged into the evaporation gas discharged from the storage tank 11 through the evaporation gas recycle line L5 and supplied to the evaporation gas compression unit 13. More specifically, the evaporation gas recycle line L5 extends from the upper end of the gas-liquid separator 23 and is connected to the evaporation gas supply line L1 on the upstream side of the heat exchanger 21.

위에서는 설명의 편의상 열교환기(21)가 증발가스 복귀라인(L3)에 설치된 것으로 설명하였으나, 실제로 열교환기(21)에서는 증발가스 공급라인(L1)을 통해 이송되고 있는 증발가스의 제1 스트림과 증발가스 복귀라인(L3)을 통해 이송되고 있는 증발가스의 제3 스트림 사이에 열교환이 이루어지고 있으므로, 열교환기(21)는 증발가스 공급라인(L1)에 설치된 것이기도 하다.In the above description, the heat exchanger 21 is provided in the evaporation gas return line L3, but in the heat exchanger 21, the first stream of the evaporation gas being fed through the evaporation gas supply line L1 The heat exchanger 21 is installed in the evaporation gas supply line L1 since heat exchange is performed between the third stream of the evaporation gas being transferred through the evaporation gas return line L3.

증발가스 재순환라인(L5)에는 또 다른 팽창밸브(24)가 더 설치될 수 있으며, 그에 따라 기액분리기(23)로부터 배출된 기체 성분은 팽창밸브(24)를 통과하면서 감압될 수 있다. 또한 열교환기(21)에서 액화된 후 기액분리기(23)로 공급되는 증발가스의 제3 스트림과 기액분리기(23)에서 분리되어 증발가스 재순환라인(L5)을 통해 이송되는 기체 성분을 열교환시켜 제3 스트림을 더욱 냉각시킬 수 있도록 증발가스 재순환라인(L5)에는 냉각기(25)가 설치된다. 즉, 냉각기(25)에서는 고압 액체 상태의 증발가스를, 저압 극저온 기체 상태의 천연가스와 열교환으로 추가 냉각시킨다.The evaporation gas recirculation line L5 may be further provided with another expansion valve 24 so that the gas component discharged from the gas-liquid separator 23 can be decompressed while passing through the expansion valve 24. The third stream of the evaporated gas supplied to the gas-liquid separator 23 after being liquefied in the heat exchanger 21 is heat-exchanged with the gas component separated by the gas-liquid separator 23 and conveyed through the evaporation gas recycle line L5, The evaporator gas recycle line (L5) is equipped with a cooler (25) to further cool the stream. That is, in the cooler 25, the evaporation gas in the high-pressure liquid state is further cooled by heat exchange with the natural gas in the low-pressure cryogenic gaseous state.

여기에서, 설명의 편의상 냉각기(25)가 증발가스 재순환라인(L5)에 설치된 것으로 설명하였으나, 실제로 냉각기(25)에서는 증발가스 복귀라인(L3)을 통해 이송되고 있는 증발가스의 제3 스트림과 증발가스 재순환라인(L5)을 통해 이송되고 있는 기체 성분 사이에 열교환이 이루어지고 있으므로, 냉각기(25)는 증발가스 복귀라인(L3)에 설치된 것이기도 하다.Although the cooler 25 has been described as being installed in the evaporative gas recirculation line L5 for convenience of explanation, in the cooler 25 in reality, the third stream of the evaporative gas being fed through the evaporative gas return line L3, The cooler 25 is provided in the evaporation gas return line L3 since heat exchange is performed between the gas components being transferred through the gas recirculation line L5.

한편, 저장탱크(11)에서 발생하는 증발가스의 양이 고압 천연가스 분사 엔진에서 요구하는 연료량보다 많아 잉여의 증발가스가 발생할 것으로 예상되는 경우에는, 증발가스 압축부(13)에서 압축된 혹은 단계적으로 압축되고 있는 도중의 증발가스를, 증발가스 분기라인(L7, L8)을 통하여 분기시켜 증발가스 소비수단에서 사용한다. 증발가스 소비수단으로서는 ME-GI 엔진에 비해 상대적으로 낮은 압력의 천연가스를 연료로서 사용할 수 있는 GCU, DF Generator, 가스 터빈, DFDE 등이 사용될 수 있다.
If the amount of evaporative gas generated in the storage tank 11 is higher than the amount of fuel required by the high-pressure natural gas injection engine and excess evaporative gas is expected to be generated, the compressed or stepped Is branched through the evaporation gas branch lines (L7, L8) and used in the evaporation gas consumption means. GCU, DF Generator, Gas Turbine, DFDE, etc., which can use natural gas relatively low in pressure compared with ME-GI engine, can be used as evaporative gas consumption means.

도 2에는 본 발명의 다른 실시예에 따른 증발가스의 재액화 시스템을 개략적으로 도시하였다. FIG. 2 schematically shows a re-liquefaction system for a vaporized gas according to another embodiment of the present invention.

도 2에 도시된 바와 같이, 본 실시예의 증발가스 재액화 시스템은, 선박 또는 해양 구조물에 마련된 저장탱크(T)에서 발생하는 증발가스를 압축하는 컴프레서(100)와, 컴프레서(100)에서 압축된 증발가스가 컴프레서(100)로 도입될 증발가스와 열교환되는 복수의 열교환기(210, 310)와, 복수의 열교환기에서 열교환된, 압축된 증발가스가 단열팽창되는 감압 밸브(400)를 포함한다. 2, the evaporation gas re-liquefaction system of the present embodiment includes a compressor 100 for compressing evaporative gas generated in a storage tank T provided in a ship or an offshore structure, A plurality of heat exchangers 210 and 310 where the evaporation gas is heat-exchanged with the evaporation gas to be introduced into the compressor 100, and a decompression valve 400 in which the compressed evaporation gas heat-exchanged in the plurality of heat exchangers is thermally expanded .

본 실시예의 컴프레서(100)는, 전술한 실시예의 도 1에 도시된 증발가스 압축부(도 1의 13)와 같이, 복수의 압축기(미도시)와 중간냉각기(미도시)를 포함하는 다단 구성으로 이루어질 수 있으며, 저장탱크(T)에서 발생하는 증발가스를 150 내지 400 bar로 압축할 수 있다. The compressor 100 of the present embodiment has a multi-stage structure (not shown) including a plurality of compressors (not shown) and an intermediate cooler (not shown) like the evaporative gas compression unit And the evaporation gas generated in the storage tank T can be compressed to 150 to 400 bar.

압축을 거치면서 증발가스는 온도가 높아지는데, 이를 저장탱크(T)에서 발생하여 컴프레서(100)로 도입될 증발가스와 열교환기(210, 310)에서 열교환시킴으로써 압축된 증발가스에 냉열을 전달한다. The temperature of the evaporation gas increases as it is compressed. The evaporation gas generated in the storage tank T exchanges heat with the evaporation gas to be introduced into the compressor 100 and the heat exchangers 210 and 310, thereby transferring cold heat to the compressed evaporation gas .

본 실시예에서는 이때 복수의 열교환기(210, 310)를 병렬로 마련하여, 컴프레서에서 압축된 증발가스를 분기하여 복수의 열교환기로 도입시키게 된다. 도 2에서 저장탱크(T)로부터 컴프레서(100)로 향하는 증발가스의 흐름(L1)과, 컴프레서(100) 후단에서 분기된 후(L2) 다시 열교환기의 수에 따라 분기된 증발가스의 흐름(L2a, L2b)이 열교환기(210, 310)에서 열교환되는 것을 확인할 수 있다.In this embodiment, a plurality of heat exchangers 210 and 310 are provided in parallel at this time, and the evaporated gas compressed by the compressor is branched into a plurality of heat exchangers. The flow L1 of the evaporation gas flowing from the storage tank T to the compressor 100 and the flow L2 of the evaporator gas branched according to the number of the heat exchangers after branching from the rear end of the compressor 100 L2a, and L2b are heat-exchanged in the heat exchangers 210 and 310.

바람직하게는, 본 실시예의 열교환기는 PCHE(Printed Circuit Heat Exchanger)이다. Preferably, the heat exchanger of the present embodiment is a PCHE (Printed Circuit Heat Exchanger).

PCHE 열교환기의 개략적인 구조를 도 3에 도시하였다. 도 3에 도시된 바와 같이 PCHE 열교환기는 열교환될 유체가 서로 다른 방향에서 열교환기로 유입되어(S1, S2) 이를 통과하면서 열교환이 이루어진다. 이와 같은 PCHE 열교환기는 열교환가능한 온도 범위가 -200 내지 900℃ 정도로 매우 넓고, 열교환기 단위 부피당 열전이 면적이 넓어 높은 열 전달률을 나타내며, 기체와 액체, 이상(two-phase) 흐름 등의 여러 유체에 이용할 수 있는 장점이 있다. The schematic structure of the PCHE heat exchanger is shown in Fig. As shown in FIG. 3, the PCHE heat exchanger is heat exchanged while the fluid to be heat-exchanged flows into the heat exchanger from different directions (S1, S2) and passes through the heat exchanger. Such a PCHE heat exchanger has a very wide heat exchangeable temperature range of about -200 to 900 ° C. and a large heat transfer area per unit volume of the heat exchanger, exhibits a high heat transfer rate and can be applied to various fluids such as gas and liquid and two- There are advantages to be able to use.

반면에 열교환기 내부의 circuit이 매우 작아 관로가 막히는 문제가 있을 수 있는데, 이러한 경우 열교환기를 작동시킬 수 없게 된다. 본 실시예는 이러한 문제의 해결을 위해 병렬로 복수의 열교환기(210, 310)를 마련함으로써, 열교환기 일부에서 관로 막힘이나 다른 고장, 열교환기 교체 등의 유지보수가 이루어질 때에도 나머지 열교환기를 통해 증발가스의 열교환이 이루어질 수 있어 중단 없이 증발가스를 재액화할 수 있도록 시스템을 구성하였다. On the other hand, the circuit inside the heat exchanger may be too small to block the pipeline. In this case, the heat exchanger can not be operated. In the present embodiment, a plurality of heat exchangers 210 and 310 are provided in parallel for solving such a problem, so that even when maintenance such as clogging of pipes, other faults, replacement of a heat exchanger, etc. is performed in a part of the heat exchanger, The system is constructed so that evaporation gas can be re-liquefied without interruption.

복수의 열교환기 각각의 전단 및 후단에는 압축된 증발가스 또는 증발가스의 압력을 감지하는 압력 센서(220, 240, 320, 340)가 마련되고, 복수의 열교환기 각각의 전단 및 후단에는 차단 밸브(230, 250, 330, 350)가 마련된다. 이러한 압력 센서에서 감지된 압축된 증발가스 또는 증발가스의 열교환기 전단 및 후단의 압력 변화를 감지하여 열교환기의 관로 막힘 등 이상을 확인할 수 있고, 차단 밸브를 통해 해당 열교환기로 흐르는 유로를 개폐할 수 있다. In the front end and the rear end of each of the plurality of heat exchangers, pressure sensors (220, 240, 320, 340) for sensing the pressure of the compressed evaporative gas or the evaporative gas are provided, 230, 250, 330, and 350 are provided. It is possible to detect the abnormalities such as clogging of the piping of the heat exchanger by detecting the pressure change of the upstream and downstream of the heat exchanger of the compressed evaporation gas or the evaporation gas detected by the pressure sensor and to open and close the flow channel through the shut- have.

도 2의 실시예에는 이와 같이 각각 열교환기, 열교환기 전 후단에 마련된 압력 센서 및 차단 밸브를 포함하는 2개의 열교환부, 즉 제1 열교환부(200)와 제2 열교환부(300)가 병렬로 마련되어 컴프레서에서 압축된 증발가스가 컴프레서 후단에서 분기되어 각각의 열교환부로 도입되는 시스템을 도시하였다. In the embodiment of FIG. 2, the two heat exchangers including the heat exchanger, the pressure sensor provided at the front and rear of the heat exchanger, and the shut-off valve, that is, the first heat exchanger 200 and the second heat exchanger 300, So that the evaporated gas compressed in the compressor is branched at the downstream end of the compressor and introduced into each of the heat exchange units.

본 실시예에서 열교환부를 거친 증발가스는 유로를 따라(L3) 감압 밸브(400)로 도입되고, 감압 밸브(400)를 통과하며 단열팽창된 증발가스는 기액분리기(500)로 도입되어 기액분리된다. 기액분리기(500)에서 분리된 액화천연가스는 저장탱크(T)로 회수되고(L4), 분리된 기체는 저장탱크(T)에서 발생한 증발가스의 흐름에 합류되어(L5), 함께 복수의 열교환기(200, 300)로 도입될 수 있다. In this embodiment, the evaporated gas passing through the heat exchanging portion is introduced into the pressure reducing valve 400 along the flow path L3, the evaporated gas having passed through the pressure reducing valve 400 and being thermally expanded is introduced into the gas-liquid separator 500 to be gas- . Liquid separated from the gas-liquid separator 500 is recovered (L4) to the storage tank T (L4), and the separated gas joins the flow of the evaporative gas generated in the storage tank T (L5) May be introduced into the devices 200 and 300.

감압 밸브(400)는 줄-톰슨 밸브가 사용될 수 있으며, 감압 밸브를 대신하여 팽창기(expander)를 비롯한 다른 감압 장치가 사용될 수도 있다. 냉각된 증발가스는 감압 밸브 등의 감압 장치를 통해 단열팽창되면서 압력이 낮아진다. Reduced pressure valve 400 may be a Row-Thomson valve, and other reduced pressure devices, including an expander, may be used in place of the reduced pressure valve. The cooled evaporated gas is mono-expanded through a decompression device such as a pressure reducing valve, and the pressure is lowered.

이와 같이 저장탱크(T)에서 발생한 증발가스를 압축, 냉각 및 단열팽창 과정을 거치면서 재액화되어, 기액분리기(500)를 통해 액화천연가스가 분리되어 저장탱크(T)로 회수된다. The evaporated gas generated in the storage tank T is re-liquefied under compression, cooling, and thermal expansion processes, and the liquefied natural gas is separated through the gas-liquid separator 500 and recovered into the storage tank T.

한편, 컴프레서(T)에서 150 내지 400 bar의 압력으로 압축된 증발가스 중 적어도 일부는 선박 또는 해양 구조물의 엔진(E) 연료로 공급될 수 있는데, 특히 이때의 엔진은 고압가스를 연료로 하는 고압가스 분사엔진, 바람직하게는 ME-GI 엔진이다. 전술한 실시예에서와 같이 ME-GI 엔진 외에, ME-GI 엔진보다 낮은 압력의 연료를 공급받는 DFDE나 DF generator 등을 추가로 구성하여 컴프레서 중간에서 압축된 가스를 분기하여 이들의 연료로 공급할 수도 있다. On the other hand, at least a part of the evaporated gas compressed at a pressure of 150 to 400 bar in the compressor T can be supplied to the engine E of the ship or an offshore structure. In particular, the engine at this time is a high pressure Gas injection engine, preferably an ME-GI engine. In addition to the ME-GI engine, a DFDE or DF generator, which supplies fuel at a pressure lower than that of the ME-GI engine, may be additionally provided to divide the compressed gas in the middle of the compressor, have.

이상에서 살펴본 바와 같이 본 실시예에서는, 1) 선박 또는 해양 구조물의 저장탱크에서 발생하는 증발가스를 압축하는 단계; 2) 압축된 증발가스를 분기하고 병렬로 마련된 복수의 열교환기로 도입시켜, 저장탱크에서 발생한 압축 전의 증발가스와 열교환시키는 단계; 및 3) 열교환된 증발가스를 단열팽창시키고 기액분리하는 단계를 거쳐 증발가스를 재액화하게 된다.
As described above, in this embodiment, 1) compressing evaporative gas generated in a storage tank of a ship or an offshore structure; 2) introducing the compressed evaporated gas into a plurality of heat exchangers provided in parallel to cause heat exchange with the evaporated gas before compression occurring in the storage tank; And 3) a step of subjecting the heat-exchanged evaporated gas to thermal expansion and gas-liquid separation, thereby re-liquefying the evaporated gas.

이와 같이 본 발명은 기재된 실시 예에 한정되는 것이 아니고, 본 발명의 사상 및 범위를 벗어나지 않고 다양하게 수정 및 변형할 수 있음은 이 기술의 분야에서 통상의 지식을 가진 자에게 자명하다. 따라서 그러한 수정 예 또는 변형 예들은 본 발명의 특허청구범위에 속한다 하여야 할 것이다.It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

100: 컴프레서
200, 300: 열교환부
210, 310: 열교환기
220, 240, 320, 340: 압력 센서
230, 250, 330, 350: 차단 밸브
400: 감압 밸브
500: 기액분리기
T: 저장탱크
E: 엔진100: Compressor
200, 300: heat exchanger
210, 310: Heat exchanger
220, 240, 320, 340: Pressure sensor
230, 250, 330, 350: Shutoff valve
400: Pressure reducing valve
500: gas-liquid separator
T: Storage tank
E: engine

Claims (7)

선박 또는 해양 구조물에 마련된 저장탱크에서 발생하는 증발가스를 압축하는 컴프레서;
상기 컴프레서에서 압축된 증발가스가 상기 컴프레서로 도입될 증발가스와 열교환되는 복수의 열교환기; 및
상기 복수의 열교환기에서 열교환된 상기 압축된 증발가스가 단열팽창되는 팽창 수단을 포함하되,
상기 복수의 열교환기는 병렬로 마련되어, 상기 컴프레서에서 압축된 증발가스는 상기 컴프레서의 후단에서 분기되어 상기 복수의 열교환기로 도입되는 것을 특징으로 하는 증발가스 재액화 시스템. A compressor for compressing evaporative gas generated in a storage tank provided in a ship or an offshore structure;
A plurality of heat exchangers in which the evaporated gas compressed in the compressor is heat-exchanged with the evaporated gas to be introduced into the compressor; And
And expansion means in which the compressed evaporated gas heat-exchanged in the plurality of heat exchangers undergoes thermal expansion,
Wherein the plurality of heat exchangers are provided in parallel, and the evaporated gas compressed by the compressor is branched at a rear end of the compressor and introduced into the plurality of heat exchangers. 제 1항에 있어서,
상기 팽창 수단을 거쳐 단열팽창된 상기 증발가스를 기액분리하는 기액분리기를 더 포함하여,
상기 기액분리기에서 분리된 액화천연가스는 상기 저장탱크로 회수되고, 분리된 기체는 상기 저장탱크에서 발생한 상기 증발가스와 함께 상기 복수의 열교환기로 도입되는 것을 특징으로 하는 증발가스 재액화 시스템. The method according to claim 1,
And a gas-liquid separator for separating the vaporized gas that has been thermally expanded through the expansion means by gas-liquid separation,
Wherein the liquefied natural gas separated from the gas-liquid separator is recovered to the storage tank, and the separated gas is introduced into the plurality of heat exchangers together with the evaporated gas generated in the storage tank. 제 1항에 있어서,
상기 복수의 열교환기 각각의 전단 및 후단에는 상기 압축된 증발가스 또는 상기 증발가스의 압력을 감지하는 압력 센서가 마련되고,
상기 복수의 열교환기 각각의 전단 및 후단에는 차단 밸브가 마련되는 것을 특징으로 하는 증발가스 재액화 시스템.The method according to claim 1,
A pressure sensor is provided at the front end and the rear end of each of the plurality of heat exchangers to sense the pressure of the compressed evaporative gas or the evaporative gas,
And a shutoff valve is provided at the front end and the rear end of each of the plurality of heat exchangers. 제 3항에 있어서,
상기 열교환기는 PCHE(Printed Circuit Heat Exchanger)이고,
상기 압력 센서에서 감지된 상기 압축된 증발가스 또는 상기 증발가스의 열교환기 전단 및 후단의 압력차이로 상기 열교환기의 관로 막힘을 확인하여, 상기 차단 밸브로 상기 열교환기를 개폐하는 것을 특징으로 하는 증발가스 재액화 시스템. The method of claim 3,
The heat exchanger is a PCHE (Printed Circuit Heat Exchanger)
Wherein the control unit confirms clogging of the pipe of the heat exchanger by a difference in pressure between the compressed evaporative gas detected by the pressure sensor or the evaporated gas before and after the heat exchanger to open and close the heat exchanger with the shut- Re-liquefaction system. 제 1항에 있어서,
상기 컴프레서에서 상기 증발가스는 150 내지 400 bar의 압력으로 압축되고,
상기 컴프레서에서 압축된 상기 증발가스 중 적어도 일부는 상기 선박 또는 해양 구조물의 엔진 연료로 공급되는 것을 특징으로 하는 증발가스의 재액화 시스템.The method according to claim 1,
Wherein the evaporation gas in the compressor is compressed to a pressure of from 150 to 400 bar,
Wherein at least a portion of the evaporated gas compressed in the compressor is supplied to the engine fuel of the ship or offshore structure. 제 1항에 있어서,
상기 팽창 수단은 감압 밸브 및 팽창기(expander)를 포함하는 증발가스의 재액화 시스템.The method according to claim 1,
Wherein the expansion means comprises a pressure reducing valve and an expander. 1) 선박 또는 해양 구조물의 저장탱크에서 발생하는 증발가스를 압축하는 단계;
2) 압축된 증발가스를 분기하고 병렬로 마련된 복수의 열교환기로 도입시켜, 상기 저장탱크에서 발생한 압축 전의 증발가스와 열교환시키는 단계; 및
3) 열교환된 상기 증발가스를 단열팽창시키고 기액분리하는 단계를 포함하는 증발가스의 재액화 방법.
1) compressing the evaporative gas generated in the storage tank of a ship or an offshore structure;
2) introducing the compressed evaporated gas into a plurality of heat exchangers provided in parallel to heat-exchange the evaporated gas before compression generated in the storage tank; And
3) a step of subjecting the heat-exchanged evaporated gas to thermal expansion and gas-liquid separation.
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