KR102295430B1 - Reliquefaction system - Google Patents

Reliquefaction system Download PDF

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KR102295430B1
KR102295430B1 KR1020150003991A KR20150003991A KR102295430B1 KR 102295430 B1 KR102295430 B1 KR 102295430B1 KR 1020150003991 A KR1020150003991 A KR 1020150003991A KR 20150003991 A KR20150003991 A KR 20150003991A KR 102295430 B1 KR102295430 B1 KR 102295430B1
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South Korea
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heat exchange
gas
cooling water
exchange unit
boil
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KR1020150003991A
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Korean (ko)
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KR20160086554A (en
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최병윤
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삼성중공업 주식회사
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    • 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
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022—Hydrocarbons, e.g. natural gas
    • F25J1/0025—Boil-off gases "BOG" from storages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR 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
    • 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
    • F25J1/0047—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 an "external" refrigerant stream in a closed vapor compression cycle
    • F25J1/0052—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 an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant 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
    • F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
    • F25J1/008—Hydrocarbons
    • F25J1/0087—Propane; Propylene
    • 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
    • F25J1/009—Hydrocarbons with four or more carbon atoms
    • 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
    • F25J1/0092—Mixtures of hydrocarbons comprising possibly also minor amounts of nitrogen
    • 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
    • F25J1/0203—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 a single-component refrigerant [SCR] fluid in a closed vapor compression cycle
    • F25J1/0204—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 a single-component refrigerant [SCR] fluid in a closed vapor compression cycle as a single flow SCR cycle
    • 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
    • F25J1/0211—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 a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle
    • F25J1/0212—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 a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle as a single flow MCR cycle
    • 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.
    • F25J1/0296—Removal of the heat of compression, e.g. within an inter- or afterstage-cooler against an ambient heat sink
    • 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.
    • F25J1/0296—Removal of the heat of compression, e.g. within an inter- or afterstage-cooler against an ambient heat sink
    • F25J1/0297—Removal of the heat of compression, e.g. within an inter- or afterstage-cooler against an ambient heat sink using an externally chilled fluid, e.g. chilled water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0157—Compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0337—Heat exchange with the fluid by cooling
    • F17C2227/0341—Heat exchange with the fluid by cooling using another fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0337—Heat exchange with the fluid by cooling
    • F17C2227/0358—Heat exchange with the fluid by cooling by expansion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0105—Ships
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2215/00—Processes characterised by the type or other details of the product stream
    • F25J2215/62—Ethane or ethylene
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/04—Compressor cooling arrangement, e.g. inter- or after-stage cooling or condensate removal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/08—Cold compressor, i.e. suction of the gas at cryogenic temperature and generally without afterstage-cooler
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/30—Compression of the feed stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/90—Processes or apparatus involving steps for recycling of process streams the recycled stream being boil-off gas from storage

Abstract

재액화 시스템을 개시한다. 본 발명의 실시 예에 따른 재액화 시스템은 액화가스 및 액화가스의 증발가스를 저장하는 저장탱크; 냉매를 감압 팽창시키는 제1팽창장치; 및 제1팽창장치를 거친 냉매와 저장탱크로부터 공급된 증발가스 간 열교환을 수행하는 증발가스 열교환부;를 포함한다.Disclosed is a reliquefaction system. Reliquefaction system according to an embodiment of the present invention comprises: a storage tank for storing liquefied gas and boil-off gas of the liquefied gas; a first expansion device for expanding the refrigerant under reduced pressure; and a boil-off gas heat exchange unit performing heat exchange between the refrigerant that has passed through the first expansion device and the boil-off gas supplied from the storage tank.

Description

재액화 시스템{RELIQUEFACTION SYSTEM}reliquefaction system {RELIQUEFACTION SYSTEM}

본 발명은 재액화 시스템에 관한 것이다.The present invention relates to a reliquefaction system.

셰일가스(Shale Gas) 및 액화천연가스(Liquefied Natural Gas, 이하 ‘LNG’라 함) 등으로부터 추출된 에탄(Ethane)은 석유화학제품의 원료로 사용되며, 최근에는 그 경제성이 부각되고 있다. 1기압에서 에탄은 대략 ―88.6℃, LNG의 주요 구성 성분인 메탄은 대략 ―161.5℃의 끊는점을 갖는다. 이러한 에탄과 LNG는 액화된 상태로 선박에 의해 수송될 수 있다.Ethane extracted from shale gas and liquefied natural gas (hereinafter referred to as ‘LNG’) is used as a raw material for petrochemical products, and its economic feasibility has recently been highlighted. At 1 atmosphere, ethane has a boiling point of approximately -88.6°C, and methane, a major component of LNG, has a boiling point of approximately -161.5°C. Such ethane and LNG may be transported by ships in a liquefied state.

선박은 저장탱크로부터 공급받은 LNG 증발가스(BOG, Boil-Off Gas) 또는 LNG의 압력, 온도, 상태 등을 변환하여 엔진으로 공급하는 연료가스 공급시스템을 구비할 수 있다. 선박은 둘 이상의 이종연료를 연료로서 사용하는 DFDE(Dual Fuel Disel Electric) 엔진과 같은 저압가스 분사엔진과 ME-GI 엔진(Man B&W 사의 Gas Injection 엔진)과 같은 고압가스 분사엔진 등을 포함할 수 있다. The vessel may be provided with a fuel gas supply system that converts the LNG boil-off gas (BOG, Boil-Off Gas) supplied from the storage tank or the pressure, temperature, state, etc. of LNG and supplies it to the engine. The ship may include a low-pressure gas injection engine such as a DFDE (Dual Fuel Disel Electric) engine that uses two or more different fuels as fuel, and a high-pressure gas injection engine such as an ME-GI engine (Man B&W's Gas Injection engine). .

또, 선박에는 LNG 증발가스를 재액화하여 저장탱크에 재저장하는 재액화 설비가 마련될 수 있다. 예컨대, 한국공개특허 제10-2012-0103421호(2012. 09. 19. 공개)는 저장탱크에서 발생한 증발가스를 압축기에서 압축한 후 재액화장치에서 액화시키고, 이를 고압펌프로 공급하거나 저장탱크에 재저장하는 시스템을 제시한다.In addition, the vessel may be provided with a re-liquefaction facility for re-liquefying the LNG boil-off gas and re-storing it in a storage tank. For example, Korean Patent Application Laid-Open No. 10-2012-0103421 (published on September 19, 2012) discloses that boil-off gas generated in a storage tank is compressed in a compressor and then liquefied in a re-liquefaction device, and is supplied to a high-pressure pump or stored in a storage tank. A system for re-storing is presented.

이와 같이 종래에는 LNG 증발가스를 엔진으로 공급하거나 재액화하여 저장하는 등에 대한 시스템 개발은 활발하게 이루어진 반면, 액화에탄을 저장 및 수송하는 선박에서 액화에탄 증발가스를 효과적으로 재액화할 수 있는 시스템 개발은 미흡한 실정이다.As such, conventionally, system development for supplying or re-liquefying and storing LNG BOG to an engine has been actively carried out, whereas the development of a system capable of effectively re-liquefying liquefied ethane BOG in ships storing and transporting liquefied ethane is difficult. It is insufficient.

한국공개특허 제10-2012-0103421호(2012. 09. 19. 공개)Korean Patent Publication No. 10-2012-0103421 (published on September 19, 2012)

본 발명의 실시 예는 액화가스를 운반하는 과정에서 발생하는 증발가스를 효과적으로 재액화시킬 수 있는 재액화 시스템을 제공하고자 한다.An embodiment of the present invention is to provide a re-liquefaction system capable of effectively re-liquefying boil-off gas generated in the process of transporting the liquefied gas.

본 발명의 일 측면에 따르면, 액화가스 및 상기 액화가스의 증발가스를 저장하는 저장탱크; 냉매를 감압 팽창시키는 제1팽창장치; 및 상기 제1팽창장치를 거친 냉매와 상기 저장탱크로부터 공급된 증발가스 간 열교환을 수행하는 증발가스 열교환부;를 포함하는 재액화 시스템이 제공될 수 있다.According to an aspect of the present invention, a storage tank for storing liquefied gas and boil-off gas of the liquefied gas; a first expansion device for expanding the refrigerant under reduced pressure; and a boil-off gas heat exchange unit for performing heat exchange between the refrigerant that has passed through the first expansion device and the boil-off gas supplied from the storage tank.

냉각수를 공급하는 냉각수 공급장치; 및 상기 냉각수 공급장치로부터 공급된 냉각수와 상기 냉매 간 열교환을 수행하는 냉각수 열교환부를 더 포함할 수 있다.a cooling water supply device for supplying cooling water; and a cooling water heat exchange unit configured to perform heat exchange between the cooling water supplied from the cooling water supply device and the refrigerant.

상기 증발가스 열교환부는 제1열교환부와 제2열교환부를 포함하고, 상기 제1열교환부는 상기 저장탱크로부터 공급된 액화가스 증발가스와 상기 제2열교환부를 거친 냉매 간 1차 열교환을 수행하고, 상기 제2열교환부는 상기 제1열교환부를 거친 액화가스 증발가스와 상기 제1팽창장치를 거친 냉매 간 2차 열교환을 수행할 수 있다. The boil-off gas heat exchange unit includes a first heat exchange unit and a second heat exchange unit, and the first heat exchange unit performs primary heat exchange between the liquefied gas boil-off gas supplied from the storage tank and the refrigerant passing through the second heat exchange unit, The second heat exchange unit may perform secondary heat exchange between the liquefied gas boil-off gas passing through the first heat exchange unit and the refrigerant passing through the first expansion device.

상기 냉각수 열교환부, 상기 제1팽창장치, 상기 제2열교환부, 및 상기 제1열교환부를 거쳐 냉매가 순환되도록 하는 냉매순환라인과, 상기 냉매순환라인에 설치되고, 상기 제1열교환부를 거친 냉매를 액체성분과 기체성분으로 분리시키는 세퍼레이터를 더 포함할 수 있다.a refrigerant circulation line for circulating refrigerant through the cooling water heat exchange unit, the first expansion device, the second heat exchange unit, and the first heat exchange unit; A separator for separating the liquid component and the gas component may be further included.

상기 세퍼레이터로부터 공급된 상기 기체성분의 냉매를 압축하는 압축기와, 상기 압축된 냉매를 상기 냉각수 공급장치로부터 공급된 냉각수를 이용하여 냉각시키는 냉각기가 상기 냉각수 열교환부의 전단에 교대로 복수 개 배치될 수 있다.A plurality of compressors for compressing the gaseous refrigerant supplied from the separator and a cooler for cooling the compressed refrigerant using the cooling water supplied from the cooling water supply device may be alternately disposed at the front end of the cooling water heat exchange unit. .

상기 저장탱크의 액화가스 증발가스가 상기 제1열교환부와 상기 제2열교환부를 거쳐 상기 저장탱크에 저장되도록 하는 증발가스 공급라인과, 상기 증발가스 공급라인에 설치되며, 상기 제2열교환부를 거친 액화가스 증발가스를 감압 팽창시키는 제2팽창장치를 더 포함할 수 있다.A boil-off gas supply line for allowing the liquefied gas boil-off gas of the storage tank to be stored in the storage tank through the first heat exchange unit and the second heat exchange unit; A second expansion device for expanding the gas boil-off gas under reduced pressure may be further included.

상기 저장탱크로부터 공급된 액화가스 증발가스를 압축하는 압축기와, 상기 압축된 액화가스 증발가스를 상기 냉각수 공급장치로부터 공급된 냉각수를 이용하여 냉각시키는 냉각기가 상기 제1열교환부의 전단에 교대로 복수 개 배치될 수 있다.A compressor for compressing the liquefied gas BOG supplied from the storage tank and a cooler for cooling the compressed liquefied gas BOG using the cooling water supplied from the cooling water supply device are alternately plural at the front end of the first heat exchange unit. can be placed.

본 발명의 실시 예에 따른 재액화 시스템은 액화가스를 운반하는 과정에서 발생하는 증발가스를 효과적으로 재액화시킬 수 있다. The re-liquefaction system according to an embodiment of the present invention can effectively re-liquefy the boil-off gas generated in the process of transporting the liquefied gas.

본 발명의 효과들은 이상에서 언급한 효과들로 제한되지 않으며, 언급되지 않은 또 다른 효과들은 청구범위의 기재로부터 당업자에게 명확하게 이해될 수 있을 것이다.Effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

도 1은 본 발명의 일 실시 예에 따른 재액화 시스템을 나타낸다.
도 2는 본 발명의 다른 실시 예에 따른 재액화 시스템을 나타낸다.1 shows a reliquefaction system according to an embodiment of the present invention.
2 shows a reliquefaction system according to another embodiment of the present invention.

이하에서는 본 발명의 실시 예들을 첨부 도면을 참조하여 상세히 설명한다. 이하에 소개되는 실시 예들은 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 본 발명의 사상이 충분히 전달될 수 있도록 하기 위해 예로서 제공되는 것이다. 본 발명은 이하 설명되는 실시 예들에 한정되지 않고 다른 형태로 구체화될 수도 있다. 본 발명을 명확하게 설명하기 위하여 설명과 관계없는 부분은 도면에서 생략하였으며 도면들에 있어서, 구성요소의 폭, 길이, 두께 등은 편의를 위하여 과장되어 표현될 수 있다. 명세서 전체에 걸쳐서 동일한 참조번호들은 동일한 구성요소들을 나타낸다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments introduced below are provided as examples in order to sufficiently convey the spirit of the present invention to those of ordinary skill in the art to which the present invention pertains. The present invention is not limited to the embodiments described below and may be embodied in other forms. In order to clearly explain the present invention, parts irrelevant to the description are omitted from the drawings, and in the drawings, the width, length, thickness, etc. of components may be exaggerated for convenience. Like reference numerals refer to like elements throughout.

도 1을 참조하면, 본 발명의 일 실시 예에 따른 재액화 시스템(100)은 액화에탄을 운반하는 과정에서 발생하는 액화에탄 증발가스를 효과적으로 재액화시킬 수 있다. 재액화 시스템(100)은 액화에탄을 수송하는 선박에 설치될 수 있다. 또, 재액화 시스템(100)은 각종 액화연료 운반선, 액화연료 RV(Regasification Vessel), 컨테이너선, 일반상선, LNG FPSO(Floating, Production, Storage and Off-loading), LNG FSRU(Floating Storage and Regasification Unit) 등을 포함하는 선박에 적용될 수 있다. 이러한 재액화 시스템(100)은 저장탱크(10), 냉각수 공급장치(20), 냉각수 열교환부(30), 제1팽창장치(40), 및 증발가스 열교환부(50)를 포함한다.Referring to FIG. 1 , the reliquefaction system 100 according to an embodiment of the present invention can effectively reliquefy liquefied ethane boil-off gas generated in the process of transporting liquefied ethane. The reliquefaction system 100 may be installed in a ship transporting liquefied ethane. In addition, the reliquefaction system 100 is various liquefied fuel carriers, liquefied fuel RV (Regasification Vessel), container ship, general merchant ship, LNG FPSO (Floating, Production, Storage and Off-loading), LNG FSRU (Floating Storage and Regasification Unit) ) can be applied to ships including The reliquefaction system 100 includes a storage tank 10 , a cooling water supply device 20 , a cooling water heat exchange unit 30 , a first expansion device 40 , and a boil-off gas heat exchange unit 50 .

저장탱크(10)는 액화에탄을 저장하며, 증발가스 공급라인(L1)을 통해 후술할 증발가스 열교환부(50)에 포함된 제1열교환부(51) 쪽으로 액화에탄 증발가스를 공급한다. 저장탱크(10)는 예컨대 멤브레인형 탱크, SPB형 탱크를 포함할 수 있다. The storage tank 10 stores liquefied ethane, and supplies liquefied ethane boil-off gas toward the first heat exchange unit 51 included in the boil-off gas heat exchange unit 50 to be described later through the boil-off gas supply line L1 . The storage tank 10 may include, for example, a membrane type tank or an SPB type tank.

여기서, 증발가스 공급라인(L1)은 후술할 증발가스 열교환부(50)에 포함된 제1열교환부(51)와 제2열교환부(52)를 거쳐 재액화된 액화가스 증발가스가 저장탱크(10)에 저장되도록 한다. 제1열교환부(51) 전단의 증발가스 공급라인(L1)에는 액화가스 증발가스를 압축하는 제2압축부(12)가 마련되며, 제2열교환부(52) 후단의 증발가스 공급라인(L1)에는 제2열교환부(52)를 거친 액화가스 증발가스를 감압 팽창시키는 제2팽창장치(14)가 마련될 수 있다. Here, the boil-off gas supply line (L1) is a storage tank ( 10) to be saved. A second compression unit 12 for compressing liquefied gas BOG is provided in the BOG supply line L1 at the front end of the first heat exchange unit 51, and the BOG supply line L1 at the rear end of the second heat exchange unit 52 ) may be provided with a second expansion device 14 that expands the liquefied gas boil-off gas that has passed through the second heat exchange unit 52 under reduced pressure.

냉각수 공급장치(20)는 냉각수를 공급한다. 냉각수는 글리콜 워터(Glycol Water), 해수 등을 포함할 수 있다. 냉각수 공급장치(20)는 냉각수 열교환부(30)를 거치도록 제1냉각수 공급라인(L2a)을 통해 냉각수를 공급할 수 있다. 또, 냉각수 공급장치(20)는 저장탱크(10)로부터 공급된 액화에탄 증발가스와의 열교환을 위해 제2냉각수 공급라인(L2b, 도 2 참조)을 통해 냉각수를 공급할 수 있다.The cooling water supply device 20 supplies cooling water. The cooling water may include glycol water, seawater, and the like. The cooling water supply device 20 may supply cooling water through the first cooling water supply line L2a to pass through the cooling water heat exchange unit 30 . Also, the cooling water supply device 20 may supply cooling water through the second cooling water supply line L2b (refer to FIG. 2 ) for heat exchange with the liquefied ethane BOG supplied from the storage tank 10 .

냉각수 열교환부(30)는 냉각수 공급장치(20)로부터 공급된 냉각수와 냉매 간 열교환을 수행한다. 냉각수와의 열교환을 통해 냉매는 온도가 더 낮아지게 된다. 냉매로는 질소, 프로판, 프로필렌, 암모니아, 부탄, 부타디엔 또는 이들의 혼합물이 사용될 수 있다.The cooling water heat exchange unit 30 performs heat exchange between the cooling water supplied from the cooling water supply device 20 and the refrigerant. The temperature of the refrigerant is lowered through heat exchange with the cooling water. As the refrigerant, nitrogen, propane, propylene, ammonia, butane, butadiene, or a mixture thereof may be used.

냉매는 냉매순환라인(L3)을 따라 냉각수 열교환부(30), 제1팽창장치(40), 제2열교환부(52), 및 제1열교환부(51)를 순차적으로 거치면서 순환된다. The refrigerant is circulated while sequentially passing through the coolant heat exchange unit 30 , the first expansion device 40 , the second heat exchange unit 52 , and the first heat exchange unit 51 along the refrigerant circulation line L3 .

냉매순환라인(L3)에는 펌프(P1)와, 제1열교환부(51)를 거친 냉매를 액체성분과 기체성분으로 분리시키는 세퍼레이터(22)와, 세퍼레이터(22)로부터 공급된 기체성분의 냉매를 압축하는 제1압축부(25)가 더 마련될 수 있다.The refrigerant circulation line L3 includes a pump P1, a separator 22 that separates the refrigerant that has passed through the first heat exchange unit 51 into a liquid component and a gas component, and the gaseous refrigerant supplied from the separator 22. A first compression unit 25 for compression may be further provided.

제1팽창장치(40)는 냉각수 열교환부(30)를 거친 냉매를 감압 팽창시킨다. 제1팽창장치(40)는 예컨대 줄-톰슨(Joule Thomson) 밸브를 포함할 수 있다.The first expansion device 40 expands the refrigerant that has passed through the cooling water heat exchange unit 30 under reduced pressure. The first inflation device 40 may include, for example, a Joule Thomson valve.

증발가스 열교환부(50)는 제1팽창장치(40)를 거친 냉매와 저장탱크(10)로부터 공급된 액화가스 증발가스 간 열교환을 수행한다. 증발가스 열교환부(50)는 저장탱크(10)로부터 공급된 액화가스 증발가스와 제2열교환부(52)를 거친 냉매 간 1차 열교환을 수행하는 제1열교환부(51)와, 제1열교환부(51)를 거친 액화가스 증발가스와 제1팽창장치(40)를 거친 냉매 간 2차 열교환을 수행하는 제2열교환부(52)를 포함할 수 있다. 제1열교환부(51)와 제2열교환부(52)를 통해 액화가스 증발가스와 냉매 간 열교환이 중복해서 수행됨으로써, 보다 효과적으로 액화가스 증발가스의 재액화가 이루어질 수 있다. The BOG heat exchange unit 50 performs heat exchange between the refrigerant that has passed through the first expansion device 40 and the liquefied gas BOG supplied from the storage tank 10 . The boil-off gas heat exchange unit 50 includes a first heat exchange unit 51 that performs primary heat exchange between the liquefied gas boil-off gas supplied from the storage tank 10 and the refrigerant that has passed through the second heat exchange unit 52, and a first heat exchange It may include a second heat exchange unit 52 for performing secondary heat exchange between the liquefied gas boil-off gas that has passed through the unit 51 and the refrigerant that has passed through the first expansion device 40 . Since the heat exchange between the liquefied gas BOG and the refrigerant is repeatedly performed through the first heat exchange unit 51 and the second heat exchange unit 52 , re-liquefaction of the liquefied gas BOG may be made more effectively.

즉, 증발가스 열교환부(50)를 복수 개의 열교환부(51,52)로 구성하여, 증발가스 열교환부(50)의 성능상의 한계를 극복하고, 액화가스 증발가스의 재액화율을 높일 수 있다. 본 발명의 실시 예에서는 증발가스 열교환부(50)가 2개의 열교환부(51,52)로 구성된 것을 예로 들어 설명하였지만, 3개 이상으로 구성될 수도 있다. 이하, 도 2를 통해 본 발명의 다른 실시 예에 따른 재액화 시스템(100)에 대해서 설명하되, 도 1과 중복된 내용은 생략한다.That is, by configuring the boil-off gas heat exchange unit 50 with a plurality of heat exchange units 51 and 52 , the performance limitation of the boil-off gas heat exchange unit 50 can be overcome, and the re-liquefaction rate of the liquefied gas boil-off gas can be increased. Although the embodiment of the present invention has been described as an example that the boil-off gas heat exchange unit 50 is composed of two heat exchange units 51 and 52, it may be composed of three or more. Hereinafter, the reliquefaction system 100 according to another embodiment of the present invention will be described with reference to FIG. 2 , but overlapping content with FIG. 1 will be omitted.

도 2를 참조하면, 본 발명의 다른 실시 예에 따른 재액화 시스템(100)은 세퍼레이터(22)로부터 공급된 기체성분의 냉매를 압축하는 압축기(25-1, 25-2, … , 25-n)와, 압축된 냉매를 냉각수 공급장치(20)로부터 제1냉각수 공급라인(L2a)을 통해 공급된 냉각수를 이용하여 냉각시키는 냉각기(31-1, 31-2, … , 31-n)가 냉각수 열교환부(30)의 전단에 교대로 복수 개 배치된 구성을 포함할 수 있다. 이때, 도 1에 도시된 제1압축부(25)는 생략될 수 있다. 냉매의 온도는 복수의 압축기(25-1, 25-2, … , 25-n)와 냉각기(31-1, 31-2, … , 31-n)를 거치면서 점차적으로 낮아져 설정 온도에 도달하게 된다. 이를 통해 냉매의 사용량을 줄이면서도 효율성은 높아질 수 있다.Referring to FIG. 2 , in the reliquefaction system 100 according to another embodiment of the present invention, compressors 25-1, 25-2, ..., 25-n for compressing the gaseous refrigerant supplied from the separator 22 . ) and the coolers 31-1, 31-2, ..., 31-n for cooling the compressed refrigerant using the cooling water supplied from the cooling water supply device 20 through the first cooling water supply line L2a are provided as cooling water. It may include a configuration in which a plurality of alternately disposed at the front end of the heat exchange unit 30 . In this case, the first compression unit 25 shown in FIG. 1 may be omitted. The temperature of the refrigerant is gradually lowered to reach the set temperature while passing through a plurality of compressors (25-1, 25-2, …, 25-n) and coolers (31-1, 31-2, …, 31-n). do. Through this, the efficiency can be increased while reducing the amount of refrigerant used.

또, 본 발명의 다른 실시 예에 따른 재액화 시스템(100)은 저장탱크(10)로부터 공급된 액화가스 증발가스를 압축하는 압축기(12-1, 12-2, … , 12-n)와, 압축된 액화가스 증발가스를 냉각수 공급장치(20)로부터 제2냉각수 공급라인(L2b)를 통해 공급된 냉각수를 이용하여 냉각시키는 냉각기(32-1, 32-2, … , 32-n)가 제1열교환부(51)의 전단에 교대로 복수 개 배치된 구성을 포함할 수 있다. 이때, 도 1에 도시된 제2압축부(12)는 생략될 수 있다. 액화가스 증발가스의 온도는 복수의 압축기(12-1, 12-2, … , 12-n)와 냉각기(32-1, 32-2, … , 32-n)를 거치면서 점차적으로 낮아져 설정 온도에 도달하게 된다. In addition, the re-liquefaction system 100 according to another embodiment of the present invention includes compressors 12-1, 12-2, ..., 12-n for compressing the liquefied gas BOG supplied from the storage tank 10; Coolers (32-1, 32-2, ..., 32-n) for cooling the compressed liquefied gas BOG using cooling water supplied from the cooling water supply device 20 through the second cooling water supply line (L2b) is provided. It may include a configuration in which a plurality of heat exchangers 51 are alternately disposed at the front end. In this case, the second compression unit 12 shown in FIG. 1 may be omitted. The temperature of the liquefied gas BOG is gradually lowered through a plurality of compressors (12-1, 12-2, …, 12-n) and coolers (32-1, 32-2, …, 32-n) to the set temperature will reach

상술한 실시 예에서는 액화에탄을 예로 들어 설명하였으나, 이에 한정되는 것은 아니다. 예컨대, 액화천연가스(LNG, Liquefied Natural Gas), 액화석유가스(LPG, Liquefied Petroleum Gas), 액화프로판, 액화부탄 등과 같이 상온에서 기화되는 액화가스가 액화에탄 대신 사용될 수도 있다.In the above-described embodiment, liquefied ethane has been described as an example, but is not limited thereto. For example, liquefied gas vaporized at room temperature, such as liquefied natural gas (LNG), liquefied petroleum gas (LPG), liquefied propane, liquefied butane, etc., may be used instead of liquefied ethane.

이상에서는 특정의 실시 예에 대하여 도시하고 설명하였다. 그러나, 본 발명은 상기한 실시 예에만 한정되지 않으며, 발명이 속하는 기술분야에서 통상의 지식을 가진 자라면 이하의 청구범위에 기재된 발명의 기술적 사상의 요지를 벗어남이 없이 얼마든지 다양하게 변경 실시할 수 있을 것이다.In the above, specific embodiments have been shown and described. However, the present invention is not limited to the above embodiments, and those of ordinary skill in the art to which the invention pertains may make various changes without departing from the spirit of the invention described in the claims below. will be able

10: 저장탱크 20: 냉각수 공급장치
30: 냉각수 열교환부 14, 40: 팽창장치
22: 세퍼레이터 12, 25: 압축부
50: 증발가스 열교환부 51: 제1열교환부
52: 제2열교환부 L1: 증발가스 공급라인
L2a, L2b: 냉각수 공급라인 L3: 냉매순환라인10: storage tank 20: cooling water supply device
30: cooling water heat exchange unit 14, 40: expansion device
22: separator 12, 25: compression part
50: boil-off gas heat exchange unit 51: first heat exchange unit
52: second heat exchange unit L1: boil-off gas supply line
L2a, L2b: Cooling water supply line L3: Refrigerant circulation line

Claims (7)

액화가스 및 상기 액화가스의 증발가스를 저장하는 저장탱크;
교대로 복수 개 배치되어 상기 저장탱크로부터 공급된 증발가스를 압축 및 냉각시키는 압축기와 냉각기;
순환 공급되는 냉매를 감압 팽창시키는 제1팽창장치;
상기 제1팽창장치를 통과한 냉매와 상기 압축기와 냉각기를 통과한 증발가스 간 열교환을 수행하는 증발가스 열교환부;
냉각수를 공급하는 냉각수 공급장치;
상기 제1팽창장치의 전단에 마련되며, 상기 냉각수 공급장치로부터 공급된 냉각수와 상기 냉매 간 열교환을 수행하는 냉각수 열교환부;
상기 저장탱크, 압축기와 냉각기 및 증발가스 열교환부를 연결하며, 상기 증발가스 열교환부에 의해 재액화된 증발가스를 상기 저장탱크에 저장하는 증발가스 공급라인;
상기 냉각수 열교환부, 제1팽창장치 및 증발가스 열교환부를 연결하며, 상기 냉매를 순환공급하는 냉매순환라인;
상기 냉각수 공급장치와 냉각수 열교환부를 연결하며, 상기 냉각수 열교환부 쪽으로 냉각수를 순환 공급하는 제1냉각수 공급라인; 및
상기 냉각수 공급장치와 상기 냉각기를 연결하며, 상기 냉각기로 냉각수를 순환 공급하는 제2냉각수 공급라인;을 포함하되,
상기 증발가스 열교환부는 제1열교환부와 제2열교환부를 포함하고,
상기 제1열교환부는 상기 압축기와 냉각기를 통과한 유체와 상기 제2열교환부를 통과한 냉매 간 1차 열교환을 수행하고,
상기 제2열교환부는 상기 제1열교환부를 통과한 유체와 상기 제1팽창장치를 통과한 냉매 간 2차 열교환을 수행하는 재액화 시스템.a storage tank for storing liquefied gas and boil-off gas of the liquefied gas;
a plurality of compressors and coolers arranged alternately to compress and cool the boil-off gas supplied from the storage tank;
a first expansion device that expands the refrigerant supplied through circulation under reduced pressure;
a boil-off gas heat exchange unit for performing heat exchange between the refrigerant that has passed through the first expansion device and the boil-off gas that has passed through the compressor and the cooler;
a cooling water supply device for supplying cooling water;
a cooling water heat exchange unit provided at a front end of the first expansion device and performing heat exchange between the cooling water supplied from the cooling water supply device and the refrigerant;
a boil-off gas supply line connecting the storage tank, the compressor, the cooler, and the boil-off gas heat exchange unit, and storing the boil-off gas reliquefied by the boil-off gas heat exchange unit in the storage tank;
a refrigerant circulation line connecting the cooling water heat exchange unit, the first expansion device, and the boil-off gas heat exchange unit, and circulating and supplying the refrigerant;
a first cooling water supply line connecting the cooling water supply device and the cooling water heat exchange unit and circulating the cooling water toward the cooling water heat exchanging unit; and
a second cooling water supply line connecting the cooling water supply device and the cooler and circulating and supplying the cooling water to the cooler;
The boil-off gas heat exchange unit includes a first heat exchange unit and a second heat exchange unit,
The first heat exchange unit performs primary heat exchange between the fluid that has passed through the compressor and the cooler and the refrigerant that has passed through the second heat exchange unit,
The second heat exchange unit is a reliquefaction system for performing secondary heat exchange between the fluid that has passed through the first heat exchange unit and the refrigerant that has passed through the first expansion device. 삭제delete 삭제delete 삭제delete 삭제delete 삭제delete 삭제delete
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