KR101945473B1 - Reliquefaction system - Google Patents

Reliquefaction system Download PDF

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KR101945473B1
KR101945473B1 KR1020170153060A KR20170153060A KR101945473B1 KR 101945473 B1 KR101945473 B1 KR 101945473B1 KR 1020170153060 A KR1020170153060 A KR 1020170153060A KR 20170153060 A KR20170153060 A KR 20170153060A KR 101945473 B1 KR101945473 B1 KR 101945473B1
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South Korea
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refrigerant
refrigerant flow
gas
cooling
heat
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KR1020170153060A
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Korean (ko)
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김철우
박현기
민준호
이동훈
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삼성중공업 주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • 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
    • 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
    • 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
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022—Hydrocarbons, e.g. natural gas
    • F25J1/0025—Boil-off gases "BOG" from storages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/004—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by flash gas recovery
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0047—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
    • F25J1/0055—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 originating from an incorporated cascade
    • 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
    • F25J1/007—Primary atmospheric gases, mixtures thereof
    • F25J1/0072—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
    • F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
    • F25J1/0097—Others, e.g. F-, Cl-, HF-, HClF-, HCl-hydrocarbons etc. or mixtures thereof
    • 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
    • F25J1/0219—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 in combination with an internal quasi-closed refrigeration loop, e.g. using a deep flash recycle 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
    • F25J1/0257—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
    • F25J1/0278—Unit being stationary, e.g. on floating barge or fixed platform
    • 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
    • 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
    • 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
    • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/72—Processing device is used off-shore, e.g. on a platform or floating on a ship or barge

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Ocean & Marine Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Combustion & Propulsion (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

Disclosed is a reliquefication system. According to an embodiment of the present invention, the reliquefication system includes: a cooling line receiving and super-cooling evaporation gas from a storage tank; a refrigerant circulation line circulating a refrigerant; and a heat exchanger penetrated by the cooling line and the refrigerant circulation line to exchange heat between the evaporation gas and the refrigerant. Thus, the present invention is capable of improving the efficiency of gas liquefication processes.

Description

재액화 시스템{RELIQUEFACTION SYSTEM}RELIQUACTION SYSTEM

본 발명은 증발가스의 액화공정 전체의 효율과 용량을 증대시킬 수 있는 재액화 시스템에 관한 것이다.The present invention relates to a re-liquefaction system capable of increasing the efficiency and capacity of the entire evaporation gas liquefaction process.

선박의 연료가스 중에서 널리 이용되고 있는 천연가스(Natural Gas)는 메탄(Methane)을 주성분으로 하며, 통상적으로 그 부피를 1/600로 줄인 액화가스(Liquefied Gas) 상태로 변환시켜 저장 및 운반을 하고 있다.Natural gas, which is widely used in ship fuel gas, is mainly made of methane, and is converted into a liquefied gas state, whose volume is reduced to 1/600, and is stored and transported have.

이러한 액화가스는 선체에 단열 처리되어 설치되는 저장탱크에 수용되어 저장 및 수송되며, 선박의 엔진은 액화가스 또는 증발가스(BOG, Boil-Off Gas) 등을 연료가스로 공급받아 구동된다. 여기서 증발가스는 저장탱크 내부에 수용된 액화가스가 자연적으로 기화하여 발생되는 자연증발가스 및 강제적으로 기화하여 발생되는 강제증발가스를 포함한다. 액화가스 또는 증발가스는 압축 및 기화 등의 처리과정을 거쳐 엔진이 요구하는 조건에 맞추어 공급된다.The liquefied gas is stored and transported in a storage tank which is installed in an adiabatic treatment on the hull, and the engine of the ship is driven by supplying liquefied gas or boil-off gas (BOG) to the fuel gas. Here, the evaporation gas includes a natural evaporation gas generated by naturally vaporizing the liquefied gas contained in the storage tank, and a forced evaporation gas generated by forcibly vaporizing. The liquefied gas or the evaporated gas is supplied according to the conditions required by the engine through a process such as compression and vaporization.

한편 최근에는 저장탱크로부터 공급받은 LNG 증발가스(BOG, Boil-Off Gas)를 재액화하여 저장탱크에 재저장하는 재액화 설비가 마련되고 있다. 예컨대, 저장탱크에서 발생한 증발가스를 압축부에서 압축한 후 재액화 장치에서 액화시키고, 이를 고압펌프로 공급하거나 저장탱크에 재저장하는 시스템이 존재한다.On the other hand, recently, a liquefaction facility for re-liquefying the LNG vapor (BOG, Boil-Off Gas) supplied from the storage tank and storing it in a storage tank is provided. For example, there is a system in which the evaporation gas generated in the storage tank is compressed in the compression section and then liquefied in the re-liquefaction device and supplied to the high-pressure pump or restored in the storage tank.

한편, 종래의 재액화 설비를 이용한 공정은, 증발가스를 압축하는 공정에 선행하여 프로판을 이용해 예열(pre-cooling)시키는 단계를 포함하였다. 다만, 프로판은 휘발성이 강하기 때문에 고온의 설비 조건 하에서 화재의 위험이 발생할 수 있다는 문제가 존재하였다. On the other hand, the conventional process using the liquefaction facility includes a step of pre-cooling by using propane prior to the process of compressing the evaporative gas. However, since propane is highly volatile, there is a risk that fire may occur under high temperature facility conditions.

또한, 별도의 예열 단계를 수행하기 위해서는 다수의 장비 및 공정 비용이 요구되어 설비 구조의 복잡을 초래할 수 있다는 문제점이 발생하였다.In addition, in order to perform a separate preheating step, a large number of equipment and process costs are required, which may lead to complicated equipment structure.

이에, 재액화 공정에 앞서 단순한 예열 공정 수행이 가능한 별도의 구성을 마련함으로써, 재액화공정의 에너지 적인 효율뿐만 아니라 구조 및 비용의 단순화를 도모할 수 있는 액화 시스템의 개발이 강하게 요구되고 있는 실정이다. Therefore, there is a strong demand for development of a liquefaction system capable of simplifying the structure and cost as well as energy efficiency of the liquefaction process by providing a separate structure capable of performing a simple preheating process prior to the liquefaction process .

본 발명의 일 측면은 증발가스를 액화시키는 액화공정에 있어 그 작동이 단순한 재액화 시스템을 제공하고자 한다.One aspect of the present invention is to provide a remanufacturing system in which the operation of the liquefaction process for liquefying the evaporation gas is simple.

본 발명의 일 측면은 증발가스의 재액화에 필요한 열용량을 저감시켜 액화 공정 효율을 향상시킬 수 있는 재액화 시스템을 제공하고자 한다.An aspect of the present invention is to provide a re-liquefaction system capable of reducing the heat capacity required for re-liquefaction of evaporated gas and improving the efficiency of the liquefaction process.

본 발명의 일 측면은 전체 액화 공정의 용량 증대를 가져올 수 있는 재액화 시스템을 제공하고자 한다.One aspect of the present invention is to provide a re-liquefaction system that can lead to increased capacity of the entire liquefaction process.

본 발명의 일 측면에 따르면, 저장탱크로부터 증발가스를 공급받아 과냉시키는 냉각라인, 냉매가 순환하는 냉매순환라인 및 상기 냉각라인과 상기 냉매순환라인이 통과하도록 마련되어 상기 증발가스와 상기 냉매를 열교환하는 열교환기를 포함하고, 상기 냉매순환라인은 기체상태의 냉매를 가압하는 제1압축기와, 상기 제1압축기에 의해 가압된 냉매를 냉각하는 제1냉각기와, 상기 제1냉각기에 의해 냉각된 냉매를 기체성분의 제1냉매흐름과 액체성분의 제2냉매흐름으로 분리하는 기액분리기와, 상기 제1냉매흐름을 감압하는 제1팽창수단과, 상기 제2냉매흐름을 감압하는 제2팽창수단을 포함하고, 상기 냉각라인은 상기 증발가스를 가압하는 압축기와 상기 압축기에 의해 가압된 증발가스를 냉각하는 냉각기를 포함하는 압축부와, 상기 압축부로 공급될 증발가스와의 열교환을 통해 상기 압축부에 의해 압축된 증발가스를 예냉시키는 예열부를 포함하고, 상기 열교환기는 상기 예열부에 의해 예냉된 증발가스를 액화 및 과냉시키는 제1열교환부와, 상기 기액분리기의 후단과 제1팽창수단의 전단 사이에 마련되어 상기 제1냉매흐름을 냉각하는 제2열교환부와, 상기 제1팽창수단 후단에 마련되어 상기 제1팽창수단에 의해 감압되어 발생한 제1냉매흐름의 냉열을 전달하는 제3열교환부와, 상기 제2팽창수단에 의해 감압되어 발생한 제2냉매흐름의 냉열을 전달하는 제4열교환부와, 상기 제3열교환부를 통과한 제1냉매흐름과 상기 제4열교환부를 통과한 제2냉매흐름은 제3냉매흐름으로 합류하고 상기 제3냉매흐름을 열교환하는 제5열교환부를 포함하는 재액화시스템을 제공한다. According to an aspect of the present invention, there is provided a refrigerator comprising: a cooling line for supplying an evaporation gas from a storage tank to sub-cool the refrigerant; a refrigerant circulation line through which refrigerant circulates; and a refrigerant circulation line through which the evaporation gas and the refrigerant are heat- A first cooler for cooling the refrigerant pressurized by the first compressor, and a second cooler for cooling the coolant cooled by the first cooler, A first expansion means for reducing the first refrigerant flow and a second expansion means for reducing the second refrigerant flow, and a second expansion means for reducing the second refrigerant flow, , The cooling line includes a compressor including a compressor for pressurizing the evaporation gas and a cooler for cooling the evaporation gas pressurized by the compressor, And a preheating unit for precooling the evaporated gas compressed by the compressing unit through heat exchange with the evaporating gas, wherein the heat exchanger includes a first heat exchanging unit for liquefying and subcooling the precooled evaporation gas by the preheating unit, A second heat exchange unit provided between a rear end of the first expansion unit and the front end of the first expansion unit to cool the first refrigerant flow; a second heat exchange unit provided at the rear end of the first expansion unit, A fourth heat exchanger for transmitting the cold heat of the second refrigerant flow generated by the reduced pressure by the second expansion means, and a fourth heat exchanger for passing the first refrigerant flow through the third heat exchanger and the fourth heat exchanger And a fifth heat exchange unit that joins the third refrigerant flow and heat-exchanges the third refrigerant flow.

또한, 상기 제1 및 제2 팽창 수단은 팽창 밸브 또는 팽창기일 수 있다.In addition, the first and second expansion means may be an expansion valve or an expander.

또한, 상기 제5열교환부에 의해 완전 기화된 제3냉매흐름이 공급되는 냉매저장탱크를 더 포함하고, 상기 냉매저장탱크에 공급된 제3냉매흐름은 상기 제1압축기로 공급될 수 있다.The refrigerant storage tank may further include a refrigerant storage tank to which the third refrigerant flow completely vaporized by the fifth heat exchanging unit is supplied, and the third refrigerant flow supplied to the refrigerant storage tank may be supplied to the first compressor.

또한, 상기 냉매는 질소가스 또는 혼합냉매일 수 있다.The refrigerant may be nitrogen gas or a mixed refrigerant.

또한, 상기 냉매는 비폭발성 혼합냉매일 수 있다.In addition, the refrigerant may be a non-explosive mixed refrigerant.

본 발명의 일 측면에 의한 재액화 시스템은 예열부를 통해 증발가스에 대한 예냉 공정을 선행함으로써 예냉 사이클에 채용되는 장비들을 생략할 수 있어 그 구조가 단순하고 공정비용 또한 절감시킬 수 있다는 효과가 있다.The re-liquefaction system according to one aspect of the present invention has the effect of simplifying the structure and reducing the process cost since the equipment employed in the pre-cooling cycle can be omitted by preceding the pre-cooling process for the evaporated gas through the preheating unit.

본 발명의 일 측면에 의한 재액화 시스템은 예열부를 통해 증발가스에 대한 예냉 공정을 선행함으로써 증발가스의 액화 공정 효율이 개선될 수 있다는 효과가 있다.The re-liquefaction system according to one aspect of the present invention has an effect that the liquefaction process efficiency of the evaporation gas can be improved by pre-cooling the evaporation gas through the preheating unit.

본 발명의 일 측면에 의한 재액화 시스템은 종래의 액화공정 대비 동일한 용량의 압축기로 전체 액화 공정의 용량 증대를 가져올 수 있다는 효과가 있다.The re-liquefaction system according to one aspect of the present invention has the effect of increasing the capacity of the entire liquefaction process with a compressor of the same capacity as the conventional liquefaction process.

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

도 1은 본 발명의 일 측면에 의한 재액화 시스템을 나타낸다.1 shows a re-liquefaction system according to an aspect of the present invention.

이하에서는 본 발명의 실시 예를 첨부 도면을 참조하여 상세히 설명한다. 이하의 실시 예는 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 본 발명의 사상을 충분히 전달하기 위해 제시하는 것이다. 본 발명은 여기서 제시한 실시 예만으로 한정되지 않고 다른 형태로 구체화될 수도 있다. 도면은 본 발명을 명확히 하기 위해 설명과 관계 없는 부분의 도시를 생략하고, 이해를 돕기 위해 구성요소의 크기를 다소 과장하여 표현할 수 있다. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided to fully convey the spirit of the present invention to a person having ordinary skill in the art to which the present invention belongs. The present invention is not limited to the embodiments shown herein but may be embodied in other forms. For the sake of clarity, the drawings are not drawn to scale, and the size of the elements may be slightly exaggerated to facilitate understanding.

도 1은 본 발명의 일 측면에 의한 재액화 시스템을 나타낸다.1 shows a re-liquefaction system according to an aspect of the present invention.

도 1을 참조하면, 본 발명의 일 측면에 의한 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 구비될 수 있다.1, the re-liquefaction system 100 according to an embodiment of the present invention includes various liquefied fuel carriers, a liquefied fuel RV (regasification vessel), a container ship, a general merchant vessel, an LNG FPSO (Floating, Production, Storage and Off- loading, LNG FSRU (Floating Storage and Regasification Unit), and the like.

재액화 시스템(100)을 구동하는 장치로는 LNG 등의 액화가스로부터 발생하는 증발가스 등의 증발가스를 액화시킬 수 있는 것이라면 어떠한 구성의 것이라도 사용될 수 있다. 또한, 냉매를 순환시키는 냉동 사이클로 이루어질 수 있으며, 냉매로서는 질소나 혼합냉매를 사용할 수 있다. As the device for driving the re-liquefaction system 100, any structure may be used as long as it can liquefy the evaporation gas such as the evaporation gas generated from the liquefied gas such as LNG. Further, the refrigerant may be a refrigeration cycle for circulating the refrigerant. As the refrigerant, nitrogen or a mixed refrigerant may be used.

예컨대 비폭발성 혼합냉매(Non Flammable Mixed Refrigerant)나 SMR(Single Mixed Refrigerant)를 활용한 재액화 시스템도 사용될 수 있다. 또한, 종래 공지되어 있는 질소냉매를 활용한 재액화 시스템에 개시되어 있는 것이 사용될 수도 있다.For example, a re-liquefaction system utilizing non-explosive mixed refrigerant or SMR (Single Mixed Refrigerant) may be used. It is also possible to use a conventionally known one disclosed in a re-liquefaction system utilizing nitrogen refrigerant.

복수의 비폭발성 냉매를 혼합하여 이루어지는 비폭발성 혼합냉매는 중압으로 압축된 증발가스를 재액화할 때의 액화온도에서도 응결되지 않는 특성을 가지도록 하는 혼합 조성비를 갖는다. 혼합냉매의 상변화를 이용한 냉동 사이클은 질소만을 냉매로 하는 질소가스 냉동 사이클보다 효율이 높다. The non-explosive mixed refrigerant obtained by mixing a plurality of non-explosive refrigerants has a mixed composition ratio that makes it possible to have a property of not condensing even at the liquefaction temperature when the evaporated gas compressed at a medium pressure is re-liquefied. The refrigeration cycle using the phase change of the mixed refrigerant is more efficient than the nitrogen gas refrigeration cycle using only nitrogen as the refrigerant.

종래의 혼합냉매, 예를 들어 탄화수소(Hydro-Carbon; 이하, "HC" 라 함) 등은 폭발성 냉매가 혼합되어 안전성에 문제가 있었지만, 아르곤, 하이드로플루오르카본(Hydro-Fluoro-Carbon) 냉매 및 플루오르카본(Fluoro-Carbon) 냉매로 이루어진 혼합냉매는 폭발성이 없다.Conventional mixed refrigerants, for example, hydrocarbons (hereinafter referred to as " HC ") and the like are mixed with explosive refrigerants to cause problems in terms of safety. However, argon, hydrofluorocarbon refrigerants and fluorine Mixed refrigerants made from carbon-fluoride refrigerants are not explosive.

본 발명의 일 측면에 의한 재액화 시스템(100)은, 저장탱크(10)로부터 증발가스를 공급받아 과냉시키는 냉각라인(50), 냉매가 순환하는 냉매순환라인 및 냉각라인(50)과 냉매순환라인이 통과하도록 마련되어 증발가스와 냉매를 열교환하는 열교환기(60)를 포함한다.The re-liquefaction system 100 according to one aspect of the present invention comprises a cooling line 50 for supplying superheated gas from the storage tank 10 to supercool the refrigerant, a refrigerant circulation line and a cooling line 50 through which the refrigerant circulates, And a heat exchanger (60) provided so as to pass through the line for exchanging heat between the evaporation gas and the refrigerant.

저장탱크(10)에 저장된 액화가스는 액화상태로 저장할 수 있는 LNG(Liquefied Natural Gas), LPG(Liquefied Petroleum Gas), DME(Dimethylether), 에탄(Ethane) 중 어느 하나일 수 있으나 이에 한정되는 것은 아니다. The liquefied gas stored in the storage tank 10 may be any one of Liquefied Natural Gas (LNG), Liquefied Petroleum Gas (LPG), Dimethylether (DME), and Ethane which can be stored in a liquefied state, but is not limited thereto .

저장탱크(10)는 단열상태를 유지하면서 연료를 액화상태로 저장하는 멤브레인형 탱크, SPB형 탱크 등을 포함할 수 있다. 저장탱크(10)는 액화가스가 LNG일 경우 내부압력이 1bar를 유지하거나 연료공급조건을 고려해 그보다 높은 압력으로 유지할 수 있고, 액화상태 유지를 위해 내부온도가 ―163℃도 정도를 유지할 수 있다. The storage tank 10 may include a membrane type tank, an SPB type tank, and the like which store the fuel in a liquefied state while maintaining an adiabatic state. When the liquefied gas is LNG, the storage tank 10 can maintain the internal pressure at 1 bar or the pressure higher than the internal pressure in consideration of the fuel supply condition, and maintain the internal temperature at about -163 DEG C to maintain the liquefied state.

도 1에서 도시하고 있는 것과 같이 재액화 시스템(100)은 한 개의 폐 루프 냉동사이클(closed loop refrigeration cycle)인 냉매순환라인을 이용하여, 증발가스를 액화 온도까지 단계적으로 냉각시켜 액화천연가스(LNG)를 생산하는 공정에 적용될 수 있다. 1, the re-liquefaction system 100 uses the refrigerant circulation line, which is a closed loop refrigeration cycle, to gradually cool the evaporation gas to the liquefaction temperature to produce liquefied natural gas (LNG ). ≪ / RTI >

냉매순환라인은 제1압축기(30)를 통과하며 가압된 기체성분의 냉매를 공급받아 증발가스를 재액화시키도록 마련된다. The refrigerant circulation line is provided to pass the first compressor (30) and to supply the refrigerant of the pressurized gas component to re-liquefy the evaporated gas.

냉매순환라인은 기체상태의 냉매를 가압하는 제1압축기(30)와, 제1압축기(30)에 의해 가압된 냉매를 냉각하는 제1냉각기(31)와, 제1냉각기(31)에 의해 냉각된 냉매를 기체성분의 제1냉매흐름과 액체성분의 제2냉매흐름으로 분리하는 기액분리기(40)를 포함한다.The refrigerant circulation line includes a first compressor (30) for pressurizing the gaseous refrigerant, a first cooler (31) for cooling the refrigerant pressurized by the first compressor (30), and a second cooler And a gas-liquid separator (40) for separating the refrigerant into a first refrigerant flow of the gas component and a second refrigerant flow of the liquid component.

이 때, 밀도가 작은 기체성분의 제1냉매흐름은 상층 라인으로 분리되고, 밀도가 상대적으로 큰 액체성분의 제2냉매흐름은 하층 라인으로 분리된다. 분리된 기상의 제1냉매흐름은 이후 제1팽창수단(41)에 의해 감압되며, 액상의 제2냉매흐름은 제2팽창수단(42)에 의해 감압되어 팽창된다.At this time, the first refrigerant flow of the gas component having a smaller density is separated into the upper-layer line, and the second refrigerant flow of the liquid component having a relatively higher density is separated into the lower-layer line. The separated first gaseous refrigerant stream is then depressurized by the first expansion means 41 and the second gaseous refrigerant stream is depressurized and expanded by the second expansion means 42.

여기서, 상술한 감압에 의한 냉매흐름의 팽창은 일 팽창(work expanded)일 수 있으며, 이로써 팽창 과정에서 일정 일(work)이 발생하고, 이러한 일은 동일 사이클 또는 다른 사이클 내의 압축기를 구동할 수 있다. 또한 이러한 팽창 과정에서 냉매는 추가로 냉각될 수 있다.Here, the expansion of the refrigerant flow by the above-described depressurization may be work expanded, whereby a certain work occurs in the expansion process, and this work can drive the compressor within the same cycle or another cycle. In addition, in this expansion process, the refrigerant can be further cooled.

제1 및 제2팽창수단(41, 42)은 냉매흐름을 감압시킬 수 있는 것이라면 어떠한 구성의 것이라도 사용될 수 있으며, 예컨대, 팽창 밸브 또는 팽창기로서 마련될 수 있다.The first and second expansion means (41, 42) may be of any configuration as long as it can reduce the refrigerant flow, and may be provided, for example, as an expansion valve or an expander.

한편, 증발가스는 냉각라인(50)을 통해 재액화시스템(100)에 공급된다. 즉, 재액화시스템(100)에 공급된 증발가스는 열교환기(60) 내부의 제1 열교환부(61)를 통과하면서 냉매에 의해 냉각되어 액화될 수 있다.On the other hand, the evaporation gas is supplied to the refueling system 100 through the cooling line 50. That is, the evaporated gas supplied to the re-liquefaction system 100 may be liquefied by being cooled by the refrigerant while passing through the first heat exchanger 61 in the heat exchanger 60.

냉각라인(50)은 증발가스를 가압하는 압축기와 압축기에 의해 가압된 증발가스를 냉각하는 냉각기를 포함하는 압축부(20)와, 압축부(20)로 공급될 증발가스와의 열교환을 통해 압축부(20)에 의해 압축된 증발가스를 예냉시키는 예열부(70)를 포함한다.The cooling line 50 is connected to a compression unit 20 including a compressor for compressing the evaporation gas and a refrigerator for cooling the evaporation gas pressurized by the compressor, And a preheating unit 70 for precooling the evaporated gas compressed by the unit 20.

이 때, 압축부(20)는 직렬로 연결된 복수 개의 다단 압축기(도면부호미표시)가 마련될 수 있다. 상술한 다단의 압축기를 이용하여 냉매를 압축하는 것이 압축기의 소요동력을 감소시킨다는 측면에서 바람직하기 때문이다. At this time, the compressor 20 may be provided with a plurality of multi-stage compressors (not shown) connected in series. This is because compressing the refrigerant using the multi-stage compressor described above is preferable in terms of reducing the power required for the compressor.

이와 같이 압축기에서 압축되면서 온도가 상승한 증발가스를 냉각시키기 위해 압축부(20)는 압축기와 교대로 배치된 냉각기(도면부호미표시)를 포함할 수 있다. 이러한 냉각기는 해수 등을 이용하는 수랭식 또는 공랭식 냉각기 중 어느 하나일 수 있다. The compressor 20 may include a cooler (not shown) arranged alternately with the compressor in order to cool the evaporated gas whose temperature has increased while being compressed in the compressor. Such a cooler may be any of water-cooled or air-cooled coolers using seawater or the like.

재액화 시스템(100)은 예열부(70)를 포함함으로써, 냉매순환라인에 의한 재액화공정에 선행하여 압축부(20)에 의해 압축된 증발가스를 예냉시킨다. 이로써, 냉매순환라인을 통한 재액화공정 수행 시 요구되는 냉매 유량을 저감시킬 수 있다.The re-liquefaction system 100 includes the preheating unit 70 to pre-cool the evaporation gas compressed by the compressing unit 20 prior to the liquefaction process by the refrigerant circulation line. As a result, the refrigerant flow rate required when performing the re-liquefaction process through the refrigerant circulation line can be reduced.

아울러, 예열부(70)를 통해 재액화 공정에 앞서 증발가스에 대한 예냉 공정을 선행적으로 수행함으로써, 재액화시스템 내부에 별도의 예냉 사이클을 위한 장비들을 생략할 수 있어 그 구조가 단순하고, 공정을 위한 시간 및 비용을 절감할 수 있다.In addition, since the precooling process for the evaporation gas is performed prior to the liquefaction process through the preheating unit 70, it is possible to omit equipment for a separate precooling cycle in the re-liquefaction system, Time and cost for the process can be reduced.

이후, 예열부(70)에 의해 예냉된 증발가스는 열교환기(60) 내부의 제1 열교환부(61)에 유입되도록 마련된다.The evaporated gas precooled by the preheating unit 70 is then introduced into the first heat exchanging unit 61 in the heat exchanger 60.

상술한 공정에 기초하여, 열교환기(60)는 기액분리기(40)의 후단과 제1팽창수단(41)의 전단 사이에 마련되어 제1냉매흐름을 냉각하는 제2열교환부(62)와, 제1팽창수단(41) 후단에 마련되어 제1팽창수단(41)에 의해 감압된 제1냉매흐름의 냉열을 전달하는 제3열교환부(63)와, 제2팽창수단(42)에 의해 감압된 제2냉매흐름의 냉열을 전달하는 제4열교환부(64)와, 제3열교환부(63)를 통과한 제1냉매흐름과 제4열교환부(64)를 통과한 제2냉매흐름은 제3냉매흐름으로 합류하고 제3냉매흐름을 상술한 증발가스와 열교환시키는 제5열교환부(65)를 포함하도록 마련된다.The heat exchanger 60 is provided between the rear end of the gas-liquid separator 40 and the front end of the first expansion means 41 to provide a second heat exchange section 62 for cooling the first refrigerant flow, A third heat exchanger 63 provided at the downstream end of the first expansion device 41 to transfer the cold heat of the first refrigerant flow reduced by the first expansion device 41 and a third heat exchanger 63 provided at the downstream end of the expansion device 41, The second refrigerant flow passing through the first refrigerant flow and the fourth heat exchange portion 64 passing through the third heat exchanging portion 63 and the third refrigerant flow passing through the third refrigerant flow And a fifth heat exchanging part (65) for joining to the flow and for exchanging the third refrigerant flow with the aforementioned evaporation gas.

기액분리기(40)에 의해 분리된 기상의 제1냉매흐름은 제2열교환부(62)로 공급될 수 있다. 이후, 제2열교환부(62)를 통과한 제1냉매흐름은 제1팽창수단(41)을 통해 감압되어 팽창되고, 다시 열교환기(60)로 공급되어 내부의 제3열교환부(63)로 제1냉매흐름의 냉열을 전달하도록 제공된다.The first gaseous refrigerant stream separated by the gas-liquid separator 40 can be supplied to the second heat exchanger 62. Thereafter, the first refrigerant flow that has passed through the second heat exchanging portion 62 is reduced in pressure through the first expansion means 41, and is then supplied to the heat exchanger 60 to be supplied to the third heat exchanging portion 63 To deliver cold heat of the first refrigerant stream.

이로써, 제1팽창수단(41)에 공급되는 냉매는, 팽창 전에 열교환기(60)를 통과하는 과정에 있어서 팽창 후의 극저온 상태의 냉매와 열교환될 수 있도록 마련된다.Thus, the refrigerant supplied to the first expansion means (41) can be heat-exchanged with the refrigerant at the extremely low temperature state after expansion in the process of passing through the heat exchanger (60) before expansion.

제1팽창수단(41)은 제2열교환부(62)의 후단에 마련될 수 있다.The first expansion means (41) may be provided at the rear end of the second heat exchange section (62).

제1팽창수단(41)은 제2열교환부(62)를 통과한 제1냉매흐름을 감압함으로써, 증발가스에 대한 냉각 및 감압에 따른 재액화를 구현할 수 있다. 제1팽창수단(41)은 예컨대 줄-톰슨 밸브(Joule-Thomson Valve)로 이루어질 수 있다. 제1팽창수단(41)은 제2열교환부(62)를 통과한 제1냉매흐름을 시스템이 요구하는 가스 압력조건에 상응하는 압력수준으로 감압시킬 수 있다.The first expansion means (41) can reduce the pressure of the first refrigerant flow that has passed through the second heat exchange portion (62), and realize the re-liquefaction in accordance with the cooling and decompression of the evaporation gas. The first expansion means 41 may be, for example, a Joule-Thomson valve. The first expansion means 41 can reduce the first refrigerant flow passing through the second heat exchange portion 62 to a pressure level corresponding to the gas pressure condition required by the system.

이 때, 상술한 제1냉매흐름은 기체 또는 다상(multi phase)의 성분으로 이루어질 수 있다.At this time, the first refrigerant flow may be composed of gas or multi-phase components.

기액분리기(40)에 의해 분리된 액상의 제2냉매흐름은 제2팽창수단(42)에 의해 감압된 상태로 제4열교환부(64)에 공급됨으로써 상기 감압에 의해 발생한 냉열이 전달되도록 마련된다. The second liquid refrigerant flow separated by the gas-liquid separator 40 is supplied to the fourth heat exchanging unit 64 in a state of being depressurized by the second expansion means 42 so that the cold heat generated by the depressurization is transferred .

여기서, 상술한 제3열교환부(63)를 통과한 제1냉매흐름 및 상술한 제4열교환부(64)를 통과한 제2냉매흐름은 제5열교환부(65) 내에서 제3냉매흐름으로 합류한다. 즉, 제5열교환부(65)는 제1팽창수단(41)에 의해 감압된 제1냉매흐름의 냉열 및 제2팽창수단(42)에 의해 감압된 제2냉매흐름의 냉열이 상술한 제3냉매흐름으로부터 전달되도록 마련된다.Here, the first refrigerant flow passing through the third heat exchanging section 63 and the second refrigerant flow passing through the fourth heat exchanging section 64 described above are flowed into the third refrigerant flow in the fifth heat exchanging section 65 Join. That is, the fifth heat exchanging part (65) is configured such that the cold heat of the first refrigerant flow reduced in pressure by the first expansion means (41) and the cold heat of the second refrigerant flow reduced by the second expansion means (42) To be delivered from the refrigerant flow.

이후, 상술한 제3냉매흐름은 제5열교환부(65)내에서, 냉각라인(50)을 흐르는 증발가스와의 열교환을 통해 증발가스가 액상화(liquefaction) 과정을 거친 후 과냉(subcooling)될 수 있도록 마련된다. 제3냉매흐름은 제5열교환부(65)에 냉열을 제공함으로써 완전 기화되어, 기상의 상태로 제5열교환부(65)를 통과한다. The third refrigerant flow described above can be subcooled in the fifth heat exchanging part 65 after the liquefaction of the evaporated gas through heat exchange with the evaporating gas flowing through the cooling line 50 . The third refrigerant flow is completely vaporized by providing cold heat to the fifth heat exchanging part (65), and passes through the fifth heat exchanging part (65) in a gaseous state.

한편, 재액화시스템(100)은 제5열교환부(65)의 후단에 마련되어 제5열교환부(65)에 의해 완전 기화된 제3냉매흐름을 수집하는 냉매저장탱크(80)를 더 포함한다. 이로써, 냉매저장탱크(80)에 공급된 제3냉매흐름은 제1압축기(30)로 유입되며, 다시 위와 같은 과정이 반복된다. The re-liquefaction system 100 further includes a refrigerant storage tank 80 provided at the rear end of the fifth heat exchanging unit 65 and collecting the third refrigerant flow completely vaporized by the fifth heat exchanging unit 65. Thus, the third refrigerant flow supplied to the refrigerant storage tank 80 flows into the first compressor 30, and the above process is repeated.

이러한 냉동 사이클에 있어 냉매를 압축하고 냉각하는 단계는 도 1에서 도시하고 있는 것과 같이 반복적으로 2회이상으로 진행될 수 있다. 즉, 냉매가 제 제1압축기(30)에 의해 압축되고 제1냉각기(31)에 의해 냉각된 다음, 반복적으로 별도의 압축기에 의해 재압축되고 별도의 냉각기에 의해 재냉각될 수 있다.In this refrigeration cycle, the step of compressing and cooling the refrigerant may be repeated two or more times as shown in Fig. That is, the refrigerant is compressed by the first compressor (30) and cooled by the first cooler (31), then repeatedly recompressed by a separate compressor and re-cooled by a separate cooler.

상술한 냉매순환라인은 기본적으로 줄-톰슨 사이클에 따라 냉매가 압축-응축-팽창-증발의 단계를 연속적으로 거치도록 구성되며, 증발 단계에서 증발가스와의 열교환을 통해 증발가스를 냉각시킨다. 그리고 냉매순환라인에 대한 이외의 내용은 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 파악할 수 있는 것이므로, 본 명세서에서는 자세한 설명을 생략하기로 한다.The above-described refrigerant circulation line is basically constructed such that the refrigerant is continuously subjected to the compression-condensation-expansion-evaporation step according to the line-Thomson cycle, and the evaporation gas is cooled through heat exchange with the evaporation gas in the evaporation step. Further, the contents of the refrigerant circulation line other than those of the refrigerant circulation line can be understood by those skilled in the art, so that detailed description thereof will be omitted herein.

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.The foregoing has shown and described specific embodiments. However, it is to be understood that the present invention is not limited to the above-described embodiment, and various changes and modifications may be made without departing from the scope of the technical idea of the present invention described in the following claims It will be possible.

10: 저장탱크
20: 압축부
30: 제1압축기
31: 제1냉각기
40: 기액분리기
41: 제1 팽창수단
42: 제2 팽창수단
50: 냉각라인
60: 열교환기
61: 제1 열교환부
62: 제2 열교환부
63: 제3 열교환부
64: 제4 열교환부
65: 제5 열교환부
70: 예열부
80: 냉매저장탱크
100: 재액화시스템
10: Storage tank
20:
30: First compressor
31: first cooler
40: gas-liquid separator
41: first expansion means
42: second expansion means
50: Cooling line
60: heat exchanger
61: first heat exchanger
62: second heat exchanger
63: third heat exchanger
64: fourth heat exchanger
65: the fifth heat exchanger
70: preheating part
80: Refrigerant storage tank
100: Re-liquefaction system

Claims (5)

저장탱크로부터 증발가스를 공급받아 과냉시키는 냉각라인;
냉매가 순환하는 냉매순환라인; 및
상기 냉각라인과 상기 냉매순환라인이 통과하도록 마련되어 상기 증발가스와 상기 냉매를 열교환하는 열교환기;를 포함하고,
상기 냉매순환라인은
기체상태의 냉매를 가압하는 제1압축기와, 상기 제1압축기에 의해 가압된 냉매를 냉각하는 제1냉각기와, 상기 제1냉각기에 의해 냉각된 냉매를 기체성분의 제1냉매흐름과 액체성분의 제2냉매흐름으로 분리하는 기액분리기와, 상기 제1냉매흐름을 감압하는 제1팽창수단과, 상기 제2냉매흐름을 감압하는 제2팽창수단을 포함하고,
상기 냉각라인은
상기 증발가스를 가압하는 압축기와 상기 압축기에 의해 가압된 증발가스를 냉각하는 냉각기를 포함하는 압축부와, 상기 압축부로 공급될 증발가스와의 열교환을 통해 상기 압축부에 의해 압축된 증발가스를 예냉시키는 예열부를 포함하고,
상기 열교환기는
상기 예열부에 의해 예냉된 증발가스를 액화 및 과냉시키는 제1열교환부와, 상기 기액분리기의 후단과 제1팽창수단의 전단 사이에 마련되어 상기 제1냉매흐름을 냉각하는 제2열교환부와, 상기 제1팽창수단 후단에 마련되어 상기 제1팽창수단에 의해 감압된 제1냉매흐름의 냉열을 전달하는 제3열교환부와, 상기 제2팽창수단에 의해 감압된 제2냉매흐름의 냉열을 전달하는 제4열교환부와, 상기 제3열교환부를 통과한 제1냉매흐름과 상기 제4열교환부를 통과한 제2냉매흐름은 제3냉매흐름으로 합류하고 상기 제3냉매흐름을 열교환하는 제5열교환부를 포함하는
재액화시스템.A cooling line for supplying the evaporation gas from the storage tank and subcooling;
A refrigerant circulation line through which the refrigerant circulates; And
And a heat exchanger provided to pass the cooling line and the refrigerant circulation line to exchange heat between the evaporation gas and the refrigerant,
The refrigerant circulation line
A first cooler for cooling the refrigerant pressurized by the first compressor, and a second cooler for cooling the refrigerant cooled by the first cooler to the first refrigerant flow of the gas component and the first refrigerant of the liquid component A first expansion means for reducing the first refrigerant flow and a second expansion means for reducing the second refrigerant flow,
The cooling line
A compression unit including a compressor for compressing the evaporation gas and a cooler for cooling the evaporation gas pressurized by the compressor; and a preheating unit for preheating the evaporation gas compressed by the compression unit through heat exchange between the evaporation gas to be supplied to the compression unit And a preheating portion
The heat exchanger
A second heat exchanger provided between a rear end of the gas-liquid separator and a front end of the first expansion means for cooling the first refrigerant flow; A third heat exchanger provided at a downstream end of the first expansion means for transmitting the cold heat of the first refrigerant flow reduced in pressure by the first expansion means and a third heat exchanger for delivering the cold heat of the second refrigerant flow reduced in pressure by the second expansion means And a fifth heat exchange unit that joins the first refrigerant flow passing through the third heat exchange unit and the second refrigerant flow passing through the fourth heat exchange unit to the third refrigerant flow and the heat exchange of the third refrigerant flow,
Re-liquefaction system. 제1 항에 있어서,
상기 제1 및 제2 팽창 수단은 팽창 밸브 또는 팽창기인
재액화시스템.The method according to claim 1,
The first and second expansion means may comprise expansion valves or inflator
Re-liquefaction system. 제1 항에 있어서,
상기 제5열교환부에 의해 완전 기화된 제3냉매흐름이 공급되는 냉매저장탱크를 더 포함하고,
상기 냉매저장탱크에 공급된 제3냉매흐름은 상기 제1압축기로 공급되는
재액화시스템.The method according to claim 1,
Further comprising a refrigerant storage tank through which the third refrigerant flow is completely vaporized by the fifth heat exchanging unit,
The third refrigerant flow supplied to the refrigerant storage tank is supplied to the first compressor
Re-liquefaction system. 제1항에 있어서,
상기 냉매는 질소가스 또는 혼합냉매인 재액화시스템.The method according to claim 1,
Wherein the refrigerant is nitrogen gas or a mixed refrigerant. 제1항에 있어서,
상기 냉매는 비폭발성 혼합냉매인 재액화시스템.







The method according to claim 1,
Wherein the refrigerant is a non-explosive mixed refrigerant.







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KR20200117079A (en) * 2019-04-01 2020-10-14 삼성중공업 주식회사 Liquefaction system

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KR101628841B1 (en) * 2010-07-08 2016-06-10 대우조선해양 주식회사 Method and apparatus for liquefying natural gas
KR20160133682A (en) * 2015-05-13 2016-11-23 대우조선해양 주식회사 Natural Gas Liquifaction System for Vessels

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KR101628841B1 (en) * 2010-07-08 2016-06-10 대우조선해양 주식회사 Method and apparatus for liquefying natural gas
KR20160133682A (en) * 2015-05-13 2016-11-23 대우조선해양 주식회사 Natural Gas Liquifaction System for Vessels

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Publication number Priority date Publication date Assignee Title
KR20200117079A (en) * 2019-04-01 2020-10-14 삼성중공업 주식회사 Liquefaction system
KR102538530B1 (en) 2019-04-01 2023-06-05 삼성중공업 주식회사 Liquefaction system

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