KR20170027103A - Reliquefaction Method For Boiled-Off Gas - Google Patents

Reliquefaction Method For Boiled-Off Gas Download PDF

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Publication number
KR20170027103A
KR20170027103A KR1020150123597A KR20150123597A KR20170027103A KR 20170027103 A KR20170027103 A KR 20170027103A KR 1020150123597 A KR1020150123597 A KR 1020150123597A KR 20150123597 A KR20150123597 A KR 20150123597A KR 20170027103 A KR20170027103 A KR 20170027103A
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South Korea
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stream
heat exchanger
cooling step
present
evaporated gas
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KR1020150123597A
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Korean (ko)
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이상규
이철구
이영범
손영순
김석순
김동혁
김주신
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한국가스공사
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Priority to KR1020150123597A priority Critical patent/KR20170027103A/en
Priority to PCT/KR2016/009623 priority patent/WO2017039270A1/en
Publication of KR20170027103A publication Critical patent/KR20170027103A/en

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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
    • F25J1/0262—Details of the cold heat exchange system
    • 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
    • F17C6/00—Methods and apparatus for filling vessels not under pressure with liquefied or solidified 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
    • 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
    • F25J1/02—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
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/30—Compression of the feed stream

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

Abstract

The present invention relates to a method for re-liquefying evaporated gas. The method includes: a compression step of compressing a first stream comprising evaporated gas generated in a storage tank after making the evaporated gas pass through a first heat exchanger; a first cooling step of inputting the first stream compressed in the first compression step to the first heat exchanger again in order to cool the first stream by using the first stream before being input to the first heat exchanger; a second cooling step of executing a heat exchange operation between the first stream cooled in the first cooling step and a second stream comprising a refrigerant in a second heat exchanger to additionally cool the first stream; and a separation step of expanding the first stream and dividing the first stream into third and fourth steams. According to an embodiment of the present invention, the method can be used to efficiently re-liquefy the evaporated gas with minimal energy.

Description

증발 가스의 재액화 방법 {Reliquefaction Method For Boiled-Off Gas}BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for re-

본원 발명은 증발가스의 재액화 방법에 관한 것으로, 상세하게는 증발가스를 효율적으로 재액화 시킬 수 있는 증발 가스의 재액화 방법에 관한 것이다. The present invention relates to a method for re-liquefying an evaporated gas, and more particularly, to a method for re-liquefying an evaporated gas capable of re-liquefying an evaporated gas efficiently.

천연가스의 액화 온도는 상압에서 약 -160℃의 극저온이므로, LNG는 그 온도가 상압에서 -160℃ 보다 약간만 높아도 증발된다. 종래의 LNG 운송 수단의 경우로 예를 들어 설명하면, LNG 운송 수단의 LNG 저장탱크는 단열처리가 되어 있기는 하지만 외부의 열이 LNG에 지속적으로 전달되므로 LNG 운송 수단에 의해 LNG를 수송하는 도중에 LNG가 LNG 저장탱크 내에서 지속적으로 기화되어 LNG 저장 탱크 내에 증발가스(BOG; Boil-Off Gas)가 발생한다.Since the liquefaction temperature of natural gas is a cryogenic temperature of about -160 ° C at normal pressure, LNG is evaporated even if its temperature is slightly higher than -160 ° C at normal pressure. For example, the LNG storage tank of the LNG transportation means is heat-treated, but the external heat is continuously transferred to the LNG. Therefore, when the LNG is transported by the LNG transportation means, the LNG Is continuously vaporized in the LNG storage tank to generate boil-off gas (BOG) in the LNG storage tank.

본 발명은 증발 가스를 효율적으로 액화시킬 수 있는 증발 가스의 재액화 방법을 제공하는 것을 목적으로 한다.An object of the present invention is to provide a re-liquefaction method of an evaporation gas capable of efficiently liquefying evaporation gas.

본 발명의 일 실시예에 의한 증발 가스의 재액화 방법은 저장 탱크에서 발생된 증발가스로 이루어진 제1 스트림을 제1 열교환기를 통과시킨 후에 압축시키는 압축 단계와, 상기 제1 압축단계 이후에 압축된 상기 제1 스트림을 상기 제1 열교환기로 다시 유입시켜 상기 제1 열교환기로 유입되기 전의 제1 스트림을 이용하여 냉각시키는 제1 냉각 단계와, 제1 냉각 단계에서 냉각된 상기 제1 스트림을 제2 열교환기에서 냉매로 이루어진 제2스트림과 열교환시켜 추가적으로 냉각하는 제2 냉각 단계와, 상기 제1 스트림을 팽창시킨 후 액상의 제3 스트림과 기상의 제4 스트림으로 분리하는 분리 단계를 포함할 수 있다.A method for re-liquefying an evaporated gas according to an embodiment of the present invention includes a compressing step of compressing a first stream composed of evaporated gas generated in a storage tank after passing through a first heat exchanger, A first cooling step of flowing the first stream back into the first heat exchanger and cooling the first stream before the first stream is introduced into the first heat exchanger, A second cooling step in which the second stream is further cooled by heat exchange with a second stream made of refrigerant in the first stream, and a separation step of separating the third stream into a liquid third stream and a gaseous fourth stream after inflating the first stream.

그리고, 본 발명의 일 측면으로서, 상기 제4 스트림이 상기 제1 열교환기 및 제2 열교환기 중 적어도 하나에 유입되어 상기 제1 열교환기 또는 상기 제2 열교환기로 유입되는 다른 스트림을 냉각시키는 제3 냉각 단계를 더 포함할 수 있다.In an embodiment of the present invention, the fourth stream is introduced into at least one of the first heat exchanger and the second heat exchanger, and the third stream, which cools the other stream flowing into the first heat exchanger or the second heat exchanger, Cooling step.

그리고, 본 발명의 일 측면으로서, 상기 제3 스트림은 저장탱크로 유입될 수 있다.And, as an aspect of the present invention, the third stream may be introduced into the storage tank.

그리고, 본 발명의 일 측면으로서, 상기 제4 스트림은 구동수단을 구동하는 연료로 사용될 수 있다. And, as an aspect of the present invention, the fourth stream may be used as fuel for driving the driving means.

그리고, 본 발명의 일 측면으로서, 상기 제4 스트림은 외부로 배출될 수 있다.And, as an aspect of the present invention, the fourth stream may be discharged to the outside.

본 발명의 일 실시예에 따르면, 증발 가스를 최소한의 에너지를 사용하여 효율적으로 재액화 시킬 수 있다.According to one embodiment of the present invention, the evaporation gas can be efficiently re-liquefied using minimal energy.

도 1 내지 도 4는 각각 본 발명의 일 실시예에 의한 재액화 장치의 간략도 이다.
도 5는 본 발명의 일 실시예에 의한 증발가스의 재액화 방법의 순서도이다.1 to 4 are schematic views of a liquefaction apparatus according to an embodiment of the present invention.
5 is a flowchart of a method for re-liquefying evaporated gas according to an embodiment of the present invention.

이하, 첨부된 도면에 따라 본 발명을 상세하게 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

먼저, 이하에서 설명되는 실시예들은 본 발명인 증발가스의 재액화 방법(S100)을 이해시키는데 적합한 실시예들이다. 다만, 본 발명이 이하에서 설명되는 실시예에 한정하여 적용되거나 설명되는 실시예에 의해 본 발명의 기술적 특징이 제한되는 것은 아니며, 본 발명의 기술범위에서 다양한 변형 실시가 가능하다.
First, the embodiments described below are embodiments suitable for understanding the method (S100) of re-liquefying the evaporation gas of the present invention. It should be understood, however, that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

본 발명의 일 실시예에 의한 증발 가스의 재액화 방법(S100)은, 저장 탱크에서 발생된 증발가스로 이루어진 제1 스트림(S1)을 제1 열교환기(120)를 통과시킨 후에 압축시키는 압축 단계(S110)와, 상기 제1 압축단계 이후에 압축된 상기 제1 스트림(S1)을 상기 제1 열교환기(120)로 다시 유입시켜 상기 제1 열교환기(120)로 유입되기 전의 제1 스트림(S1)을 이용하여 냉각시키는 제1 냉각 단계(S120)와, 제1 냉각 단계(S120)에서 냉각된 상기 제1 스트림(S1)을 제2 열교환기(150)에서 냉매로 이루어진 제2스트림과 열교환시켜 추가적으로 냉각하는 제2 냉각 단계(S130)와, 상기 제1 스트림(S1)을 팽창시킨 후 액상의 제3 스트림(S3)과 기상의 제4 스트림(S4)으로 분리하는 분리 단계(S140)를 포함할 수 있다.A method (S100) of re-liquefying an evaporated gas according to an embodiment of the present invention includes a compressing step of compressing a first stream (S1) composed of evaporated gas generated in a storage tank after passing through a first heat exchanger The first stream S1 compressed after the first compression stage flows back into the first heat exchanger 120 and the first stream S1 before being introduced into the first heat exchanger 120 (S120) cooling the first stream (S1) cooled in the first cooling step (S120) to a second stream made of refrigerant in the second heat exchanger (150) by heat exchange And a separation step S140 for separating the liquid stream S3 into a liquid stream S3 and a gaseous stream S4 after expanding the first stream S1 .

도 1을 참조하면, 상기 압축 단계(S110)는 상기 저장 탱크에 수용된 증발가스로 이루어진 제1 스트림(S1)이 압축기(130)로 유입된 후 압축되는 단계이다. 상기 제1 스트림(S1)은 상기 압축 단계(S110)에서 설정된 압력만큼 압축되고 다시 열교환기로 유입된다.Referring to FIG. 1, the compression step (S110) is a step in which a first stream (S1) composed of evaporated gas accommodated in the storage tank is introduced into the compressor (130) and then compressed. The first stream S1 is compressed by the pressure set in the compressing step S110 and is then introduced into the heat exchanger.

그리고, 상기 압축기(130)를 통과한 제1 스트림(S1)은 냉각 수단(140)으로 유입되어 냉각된다. 여기서, 냉각 수단(140)은 수랭식이나 공랭식의 냉각기(cooler) 일 수 있다. 상기 냉각 수단(140)은 압축된 스트림을 냉각할 필요가 있을 때 구비될 수 있다.The first stream S1 having passed through the compressor 130 flows into the cooling unit 140 and is cooled. Here, the cooling means 140 may be a water-cooled type or an air-cooled type cooler. The cooling means 140 may be provided when it is necessary to cool the compressed stream.

그리고, 상기 제1 냉각 단계(S120)는 상기 제1 압축단계 이후에 압축된 상기 제1 스트림(S1)을 상기 제1 열교환기(120)로 유입시키고 상기 저장 탱크에서 상기 제1 열교환기(120)로 유입되는 압축되기 전의 제1 스트림(S1)과 열교환을 통해 냉각시키는 단계이다. In the first cooling step S120, the first stream S1 compressed after the first compression step is introduced into the first heat exchanger 120, and the first heat exchanger 120 Through the heat exchange with the uncompressed first stream S1.

즉, 상기 저장탱크(110)에서 유입되는 증발가스로 이루어진 제1 스트림(S1)은 저온 상태이기 때문에, 압축기(130)에서 압축되어 고온 상태인 제1 스트림(S1)과 상기 제1 열교환기(120)에서 열교환을 통해, 상기 압축기(130)에서 상기 제1 열교환기(120)로 유입되는 제1 스트림(S1)을 자체적으로 냉각시킬 수 있다. That is, since the first stream S1 of the evaporated gas flowing into the storage tank 110 is in a low temperature state, the first stream S1, which is compressed by the compressor 130 and is in a high temperature state, The first stream S1 flowing from the compressor 130 to the first heat exchanger 120 can be cooled by itself through heat exchange in the first heat exchanger 120.

그리고, 상기 제2 냉각 단계(S130)는 제1 열교환기(120)에서 냉각된 제1 스트림(S1)을 제2 열교환기(150)에서 냉각시키는 단계이다. 상기 제2 열교환기(150)에 상기 제1 스트림(S1)보다 저온 상태인 냉매로 이루어진 제2스트림이 유입되고, 상기 제1 스트림(S1)과 상기 제2 스트림(S2)이 열교환을 통해, 상기 제1 스트림(S1)이 냉각될 수 있다.The second cooling step S130 is a step of cooling the first stream S1 cooled in the first heat exchanger 120 by the second heat exchanger 150. [ A second stream of a refrigerant at a lower temperature than the first stream S1 flows into the second heat exchanger 150 and the first stream S1 and the second stream S2 heat- The first stream S1 may be cooled.

그리고, 상기 분리 단계(S140)는, 상기 제1 스트림(S1)을 팽창부(160)에서 팽창시켜 냉각시킨 후 기액 분리기(170)를 통해, 액상의 제3 스트림(S3)과 기상의 제4 스트림(S4)으로 분리시키는 단계이다. 상기 팽창부(160)는 일 실시예로 팽창 밸브 또는 익스펜더가 이에 해당될 수 있고, 액체를 기화시켜 냉각시키는 한 다양한 실시예가 가능하다. 상기 기액 분리기(170) 유체를 액체와 기체로 분리시키는 한 공지의 다양한 실시예가 채용될 수 있다. In the separation step S140, the first stream S1 is expanded by the expansion unit 160 and cooled, and then the third stream S3 of liquid phase and the fourth stream of vapor phase And the stream S4. The expansion unit 160 may be, for example, an expansion valve or an expander, and various embodiments are possible as long as the liquid is vaporized and cooled. Various known embodiments may be employed as long as the gas-liquid separator 170 fluid is separated into a liquid and a gas.

그리고, 도 1을 참조하면, 본 발명의 일 실시예에 의한 증발 가스 재액화 방법(S100)은 상기 제3 스트림(S3)은 재액화 되어 다시 저장탱크(110)로 유입될 수 있다. 그리고 상기 제4 스트림(S4)은 외부(180)로 배출되거나 연소될 수 있다.Referring to FIG. 1, in the evaporation gas re-liquefaction method S100 according to an embodiment of the present invention, the third stream S3 may be re-liquefied and then introduced into the storage tank 110 again. And the fourth stream S4 may be discharged to the exterior (180) or burned.

한편, 도 2 내지 도 4를 참조하면, 본 발명의 일 실시예에 의한 증발가스 재액화 방법(S100)은 상기 제4 스트림(S4)이 상기 제1 열교환기(120) 및 제2 열교환기(150) 중 적어도 하나에 유입되어 냉각되어 상기 제1 열교환기(120) 또는 상기 제2 열교환기(140)로 유입되는 다른 스트림(S1)을 냉각시키는 제3 냉각 단계(S150)를 더 포함할 수 있다. 2 to 4, the evaporation gas re-liquefaction method S100 according to an embodiment of the present invention is characterized in that the fourth stream S4 is supplied to the first heat exchanger 120 and the second heat exchanger 150) for cooling the other stream (S1) flowing into at least one of the first heat exchanger (120) and the second heat exchanger (140) have.

도 2를 참조하면, 본 발명의 다른 실시예에 의한 증발가스 재액화 방법(S100)은 상기 제3 냉각 단계(S150)에서 상기 제4 스트림(S4)이 상기 제1 열교환기(120)로 유입되어, 상기 제1 스트림(S1)과 열교환을 통해 상기 제1 스트림(S1)을 추가적으로 냉각시킨 후 구동수단(190)으로 유입되어 연료로 사용될 수 있다.Referring to FIG. 2, the evaporating gas re-liquefaction method S100 according to another embodiment of the present invention may further include the fourth stream S4 flowing in the first heat exchanger 120 in the third cooling step S150. The first stream S1 is further cooled through heat exchange with the first stream S1 and then introduced into the driving means 190 and used as fuel.

도 3을 참조하면, 본 발명의 다른 실시예에 의한 증발가스 재액화 방법(S100)은 상기 제3 냉각 단계(S150)에서 상기 제4 스트림(S4)이 상기 제2 열교환기(150)로 유입되어, 상기 제1 스트림(S1)과 열교환을 통해 상기 제1 스트림(S2)를 냉각시킨 후 구동수단(190)으로 유입되어 연료로 사용될 수 있다. Referring to FIG. 3, the evaporation gas remelting method (S100) according to another embodiment of the present invention is characterized in that in the third cooling step (S150), the fourth stream (S4) flows into the second heat exchanger And the first stream S2 may be cooled through the heat exchange with the first stream S1 and then introduced into the driving means 190 and used as fuel.

도 4를 참조하면, 본 발명의 다른 실시예에 의한 증발가스 재액화 방법(S100)은 상기 제3 냉각 단계(S150)에서 상기 제4 스트림(S4)이 상기 제1 열교환기(120) 및 상기 제2 열교환기(150)로 유입되어 상기 제1 스트림(S1)과 열교환을 통해 상기 제1 열교환기(120) 및 상기 제2 열교환기(150)를 통과하는 제1 스트림(S1)을 냉각시킨 후 구동수단(190)으로 유입되어 연료로 사용될 수 있다.Referring to FIG. 4, the evaporation gas re-liquefaction method S100 according to another embodiment of the present invention is characterized in that the fourth stream S4 is supplied to the first heat exchanger 120 and the second heat exchanger 120 in the third cooling step S150. The first stream S1 flowing into the second heat exchanger 150 and passing through the first heat exchanger 120 and the second heat exchanger 150 through heat exchange with the first stream S1 is cooled Can be introduced into the rear drive means 190 and used as fuel.

그리고, 본 발명은 지금까지 특정한 실시예에 관하여 도시하고 설명하였지만, 이하의 특허 청구범위에 의해 마련되는 본 발명의 정신이나 분야를 벗어나지 않는 한도 내에서 본 발명이 다양하게 개조 및 변화될 수 있다는 것을 당업계에서 통상의 지식을 가지는 자는 용이하게 알 수 있음을 밝혀두고자 한다.
While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims It will be understood by those skilled in the art that the present invention can be easily understood by those skilled in the art.

110: 저장탱크
120: 제1 열교환기
130: 압축기
140: 냉각 수단
150: 제2 열교환기
160: 팽창부
170: 기액 분리기
190: 구동수단
S100: 증발가스의 재액화 방법
S110: 압축 단계
S120: 제1 냉각 단계
S130: 제2 냉각 단계
S140: 분리 단계110: Storage tank
120: first heat exchanger
130: compressor
140: cooling means
150: second heat exchanger
160: Expansion part
170: gas-liquid separator
190: driving means
S100: Method of re-liquefaction of evaporation gas
S110: compression step
S120: first cooling step
S130: second cooling step
S140: separation step

Claims (5)

저장 탱크에서 발생된 증발가스로 이루어진 제1 스트림을 제1 열교환기를 통과시킨 후에 압축하는 압축 단계;
상기 제1 압축단계 이후에 압축된 상기 제1 스트림을 상기 제1 열교환기로 유입시키고, 상기 저장 탱크에서 상기 제1 열교환기로 유입되는 압축되기 전의 제1 스트림과 열교환하여 냉각시키는 제1 냉각 단계;
제1 냉각 단계에서 냉각된 상기 제1 스트림을 제2 열교환기에서 냉매로 이루어진 제2스트림과 열교환하여 추가적으로 냉각시키는 제2 냉각 단계;
상기 제1 스트림을 팽창시킨 후 액상의 제3 스트림과 기상의 제4 스트림으로 분리하는 분리 단계;를 포함하는 증발 가스의 재액화 방법.Compressing a first stream of evaporated gas generated in the storage tank after passing through a first heat exchanger;
A first cooling step of introducing the first stream compressed after the first compression step into the first heat exchanger and performing heat exchange with the first stream before being introduced into the first heat exchanger from the storage tank to cool the first stream;
A second cooling step of heat-exchanging the first stream cooled in the first cooling step with a second stream made of refrigerant in the second heat exchanger to further cool the first stream;
Separating the first stream into a liquid third stream and a gaseous fourth stream after expanding the first stream. 제1항에 있어서,
상기 분리 단계 후에 상기 제4 스트림이 상기 제1 열교환기 및 제2 열교환기 중 적어도 하나에 유입되어 냉각되어 상기 제1 열교환기 또는 상기 제2 열교환기로 유입되는 다른 스트림을 냉각시키는 제3 냉각 단계;를 더 포함하는 증발 가스의 재액화 방법.The method according to claim 1,
A third cooling step of cooling the fourth stream after flowing into at least one of the first heat exchanger and the second heat exchanger to cool the other stream flowing into the first heat exchanger or the second heat exchanger after the separating step; Further comprising the steps of: 제1항에 있어서,
상기 제3 스트림은 저장탱크로 유입되는 것을 특징으로 하는 증발 가스의 재액화 방법.The method according to claim 1,
Wherein the third stream is introduced into the storage tank. 제2항에 있어서,
상기 제4 스트림은 구동수단을 구동하는 연료로 사용되는 것을 특징으로 하는 증발 가스의 재액화 방법.3. The method of claim 2,
And the fourth stream is used as fuel for driving the driving means. 제2항에 있어서,
상기 제4 스트림은 외부로 배출되는 것을 특징으로 하는 증발 가스의 재액화 방법.3. The method of claim 2,
And the fourth stream is discharged to the outside.
KR1020150123597A 2015-09-01 2015-09-01 Reliquefaction Method For Boiled-Off Gas KR20170027103A (en)

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JPH0942598A (en) * 1995-08-04 1997-02-14 Chiyoda Corp Processing system and processing method for vaporized gas of liquefied gas
US6041620A (en) * 1998-12-30 2000-03-28 Praxair Technology, Inc. Cryogenic industrial gas liquefaction with hybrid refrigeration generation
KR20050094798A (en) * 2005-09-08 2005-09-28 주식회사 동화엔텍 Pre-cooling system of boil-off gas from lng
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