KR20090110964A - Natural gas liquefaction method and apparatus using a mixed refrigerant cycle and a nitrogen expansion cycle - Google Patents

Natural gas liquefaction method and apparatus using a mixed refrigerant cycle and a nitrogen expansion cycle Download PDF

Info

Publication number
KR20090110964A
KR20090110964A KR1020080036456A KR20080036456A KR20090110964A KR 20090110964 A KR20090110964 A KR 20090110964A KR 1020080036456 A KR1020080036456 A KR 1020080036456A KR 20080036456 A KR20080036456 A KR 20080036456A KR 20090110964 A KR20090110964 A KR 20090110964A
Authority
KR
South Korea
Prior art keywords
mixed refrigerant
nitrogen
natural gas
cycle
refrigerant
Prior art date
Application number
KR1020080036456A
Other languages
Korean (ko)
Inventor
이정한
유진열
강도욱
박현기
Original Assignee
대우조선해양 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 대우조선해양 주식회사 filed Critical 대우조선해양 주식회사
Priority to KR1020080036456A priority Critical patent/KR20090110964A/en
Publication of KR20090110964A publication Critical patent/KR20090110964A/en

Links

Images

Classifications

    • 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
    • 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
    • F25J1/005—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 expansion of a gaseous refrigerant stream with extraction of work
    • 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
    • F25J1/02—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
    • F25J1/0214—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 dual level refrigeration cascade with at least one MCR cycle
    • F25J1/0215—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 dual level refrigeration cascade with at least one MCR cycle with one 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
    • F25J1/0243—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
    • 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
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/60—Natural gas or synthetic natural gas [SNG]

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Ocean & Marine Engineering (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

PURPOSE: Natural gas liquefaction method and apparatus are provided, which can supplement unstable driving performance by using refrigerant swelling process. CONSTITUTION: A natural gas liquefaction apparatus using mixed refrigerant cycle and nitrogen expansion cycle comprises a cold box(10), a mixed-refrigerant cycle(20), and a nitrogen expansion cycle(30). The cold box liquidizes the natural gas by the heat exchange between a mixed-refrigerant and the nitrogen refrigerant. The mixed-refrigerant cycle cools the mixed-refrigerant and supplies it to the cold box. The nitrogen expansion cycle cools the nitrogen and supplies it to the cold box.

Description

혼합냉매 사이클 및 질소 팽창 사이클을 이용한 천연가스 액화방법 및 장치{NATURAL GAS LIQUEFACTION METHOD AND APPARATUS USING A MIXED REFRIGERANT CYCLE AND A NITROGEN EXPANSION CYCLE}NATURAL GAS LIQUEFACTION METHOD AND APPARATUS USING A MIXED REFRIGERANT CYCLE AND A NITROGEN EXPANSION CYCLE}

본 발명은 천연가스를 액화시키는 방법 및 장치에 관한 것으로서, 더욱 상세하게는 혼합냉매 사이클 및 질소 팽창 사이클을 이용하여 전체 시스템의 구성을 간략화하고 효율을 높인 천연가스 액화방법 및 장치에 관한 것이다.The present invention relates to a method and apparatus for liquefying natural gas, and more particularly, to a method and apparatus for liquefying natural gas by using a mixed refrigerant cycle and a nitrogen expansion cycle to simplify the configuration of the entire system and increase efficiency.

천연가스는, 육상 또는 해상의 가스배관을 통해 가스 상태로 운반되거나, 또는 액화된 액화천연가스(LNG)의 상태로 LNG 수송선에 저장된 채 원거리의 소비처로 운반된다. 액화천연가스는 천연가스를 극저온으로 냉각하여 얻어지는 것으로 가스 상태의 천연가스일 때보다 그 부피가 대략 1/600로 줄어들므로 해상을 통한 원거리 운반에 매우 적합하다.Natural gas is transported in a gaseous state through onshore or offshore gas piping, or to a distant consumer while stored in an LNG carrier in the form of liquefied liquefied natural gas (LNG). Liquefied natural gas is obtained by cooling natural gas to cryogenic temperature, and its volume is reduced to about 1/600 than that of natural gas in gas state, so it is very suitable for long distance transportation by sea.

종래 사용되고 있는 천연가스의 액화방법은, 천연가스를 하나 이상의 열교환기 내부를 통과시켜 냉각함으로써 이루어지는 것이다. 미국특허 제 3,735,600 호 및 제 3,433,026 호 등에는 천연가스를 하나 내지 수 개의 열교환기에 공급하여 액화하는 액화방법이 개시되어 있다.The liquefaction method of natural gas conventionally used is obtained by cooling natural gas through one or more heat exchangers. U.S. Patent Nos. 3,735,600, 3,433,026 and the like disclose a liquefaction method of supplying natural gas to one or several heat exchangers to liquefy.

본 명세서에서, 천연가스란, 주성분이 메탄이지만 다른 탄화수소 성분이나 질소를 포함하는 혼합물을 의미하며, 어떤 형태(기상(氣相), 액상(液相) 또는 기상과 액상의 혼합상)의 것도 포함하는 개념이다.In the present specification, natural gas means a mixture containing methane but other hydrocarbon components or nitrogen as a main component, and includes any form (gas phase, liquid phase or mixed phase of gas phase and liquid phase). It is a concept.

액체상태로 천연가스를 저장 및 운반하기 위해서는, 천연가스가 대략 -151℃ 내지 -163℃ 정도로 냉각되어야 하며, 여기서 LNG는 대기압 정도의 압력을 갖는다. 종래기술에서, 냉각 작용은 일반적으로 프로판, 프로필렌, 에탄, 에틸렌, 메탄, 질소 또는 상기 냉매들의 조합물(즉, 혼합냉매)과 같은 하나 이상의 냉매에 의해 열교환을 통하여 이루어진다.In order to store and transport the natural gas in the liquid state, the natural gas must be cooled to about -151 ° C to -163 ° C, where LNG has a pressure of about atmospheric pressure. In the prior art, the cooling action is generally effected through heat exchange by one or more refrigerants such as propane, propylene, ethane, ethylene, methane, nitrogen or a combination of these refrigerants (ie mixed refrigerants).

그런데, 이러한 천연가스의 액화방법은, 복잡하고 비싼 설비를 필요로 하고, 넓은 열교환 표면적 및 높은 압축력을 필요로 하는 등, 개선될 여지가 있다.However, such a method of liquefaction of natural gas is likely to be improved, requiring complicated and expensive equipment, requiring a large heat exchange surface area and a high compressive force.

이러한 종래의 문제점들을 해결하기 위한 본 발명은, 혼합냉매 사이클 및 질소 팽창 사이클을 이용하여 전체 시스템의 구성을 간략화하고 액화 공정을 효율적으로 실시할 수 있도록 한 천연가스 액화방법 및 장치를 제공하고자 하는 것이다.The present invention for solving the above problems is to provide a natural gas liquefaction method and apparatus that can simplify the configuration of the entire system and efficiently perform the liquefaction process using a mixed refrigerant cycle and nitrogen expansion cycle. .

상기 목적을 달성하기 위한 본 발명에 따르면, 복수의 성분이 혼합되어 이루어진 혼합냉매 및 질소 냉매를 이용하여 천연가스를 액화시키기 위한 천연가스 액화장치로서, 혼합냉매 및 질소 냉매와의 열교환에 의해 천연가스를 액화시키는 콜드 박스와; 혼합냉매를 냉각시켜 상기 콜드 박스에 공급하기 위한 혼합냉매 사이클과; 질소를 냉각시켜 상기 콜드 박스에 공급하기 위한 질소 팽창 사이클; 을 포함하는 것을 특징으로 하는 천연가스 액화장치가 제공된다.According to the present invention for achieving the above object, as a natural gas liquefaction apparatus for liquefying natural gas using a mixed refrigerant and a nitrogen refrigerant consisting of a plurality of components, the natural gas by heat exchange with the mixed refrigerant and nitrogen refrigerant A cold box for liquefying; A mixed refrigerant cycle for cooling the mixed refrigerant to supply the cold box; A nitrogen expansion cycle for cooling nitrogen and supplying it to the cold box; There is provided a natural gas liquefaction apparatus comprising a.

상기 혼합냉매 사이클은, 하나 이상의 혼합냉매 압축기와, 상기 혼합냉매 압축기의 하류측에 각각 설치되어 압축된 혼합냉매를 냉각시키는 하나 이상의 혼합냉매 열교환기와, 냉각된 고압의 혼합냉매를 팽창시켜 극저온으로 더욱 냉각시키는 팽창수단을 포함하는 것이 바람직하다.The mixed refrigerant cycle may include one or more mixed refrigerant compressors, one or more mixed refrigerant heat exchangers respectively installed at a downstream side of the mixed refrigerant compressor to cool the compressed mixed refrigerant, and expand the cooled high-pressure mixed refrigerant to further cryogenic temperatures. It is preferred to include expansion means for cooling.

상기 질소 팽창 사이클은, 하나 이상의 질소 압축기와, 상기 질소 압축기의 하류측에 각각 설치되어 압축된 질소를 냉각시키는 하나 이상의 질소 열교환기와, 냉각된 고압의 질소를 팽창시켜 극저온으로 더욱 냉각시키는 팽창수단을 포함하는 것이 바람직하다.The nitrogen expansion cycle includes one or more nitrogen compressors, one or more nitrogen heat exchangers respectively installed downstream of the nitrogen compressor to cool compressed nitrogen, and expansion means for expanding the cooled high pressure nitrogen to further cool the cryogenic temperature. It is preferable to include.

또한, 상기 혼합냉매 사이클은, 혼합냉매를 압축시키는 제1 혼합냉매 압축기와, 상기 제1 혼합냉매 압축기에서 압축된 혼합냉매를 냉각시키는 제1 혼합냉매 열교환기와, 상기 제1 혼합냉매 열교환기에서 냉각된 혼합냉매를 더욱 고압으로 압축시키는 제2 혼합냉매 압축기와, 상기 제2 혼합냉매 압축기에서 고압으로 압축된 혼합냉매를 일부 액화시키는 제2 혼합냉매 열교환기와, 일부 액화된 혼합냉매를 기상과 액상으로 분리하는 기액 분리기와, 고압의 혼합냉매를 팽창시켜 극저온 상태로 냉각시키는 팽창밸브를 포함하는 것이 바람직하다.The mixed refrigerant cycle may include a first mixed refrigerant compressor for compressing the mixed refrigerant, a first mixed refrigerant heat exchanger for cooling the mixed refrigerant compressed by the first mixed refrigerant compressor, and a cooling in the first mixed refrigerant heat exchanger. A second mixed refrigerant compressor for compressing the mixed refrigerant at a higher pressure, a second mixed refrigerant heat exchanger for partially liquefying the mixed refrigerant compressed at high pressure in the second mixed refrigerant compressor, and a part of the liquefied mixed refrigerant in the gas phase and the liquid phase. It is preferred to include a gas-liquid separator to separate and an expansion valve for expanding the high-pressure mixed refrigerant to cool to a cryogenic state.

또한, 상기 질소 팽창 사이클은, 질소를 압축시키는 제1 내지 제3 질소 압축기와, 상기 제1 내지 제3 질소 압축기 각각의 하류측에 설치되어 압축된 질소를 냉각시키는 제1 내지 제3 질소 열교환기와, 고압의 질소를 팽창시켜 극저온 상태로 냉각시키는 팽창터빈을 포함하는 것이 바람직하다.The nitrogen expansion cycle may include a first to third nitrogen compressor for compressing nitrogen, a first to third nitrogen heat exchanger installed downstream of each of the first to third nitrogen compressors to cool the compressed nitrogen; It is preferable to include an expansion turbine for expanding the high-pressure nitrogen to cool to a cryogenic state.

상기 혼합냉매 사이클은, 상기 제1 혼합냉매 압축기에 공급될 혼합냉매를 수용하는 압력 용기를 더 포함할 수 있다.The mixed refrigerant cycle may further include a pressure vessel containing the mixed refrigerant to be supplied to the first mixed refrigerant compressor.

본 발명의 또 다른 측면에 따르면, 복수의 성분이 혼합되어 이루어진 혼합냉매 및 질소 냉매를 이용하여 천연가스를 액화시키기 위한 천연가스 액화방법으로서, 혼합냉매 압축기 및 혼합냉매 열교환기를 이용하여 혼합냉매를 압축 및 냉각함으로써 고압의 혼합냉매를 얻는 단계와; 질소 압축기 및 질소 열교환기를 이용하여 질소를 압축 및 냉각함으로써 고압의 질소를 얻는 단계와; 혼합냉매 팽창수단을 이용하여 고압의 혼합냉매를 팽창시킴으로써 혼합냉매를 더욱 냉각하는 단계와; 질소 팽창수단을 이용하여 고압의 질소를 팽창시킴으로써 질소를 더욱 냉각하는 단계와; 콜드 박스 내에서 천연가스를 냉각된 혼합냉매 및 질소와 열교환시킴으로써 천연가스를 액화시키는 단계; 를 포함하는 것을 특징으로 하는 천연가스 액화방법이 제공된다.According to another aspect of the present invention, a natural gas liquefaction method for liquefying natural gas using a mixed refrigerant and a nitrogen refrigerant consisting of a plurality of components, the mixed refrigerant is compressed using a mixed refrigerant compressor and a mixed refrigerant heat exchanger And cooling to obtain a high pressure mixed refrigerant; Obtaining nitrogen at high pressure by compressing and cooling nitrogen using a nitrogen compressor and a nitrogen heat exchanger; Further cooling the mixed refrigerant by expanding the high pressure mixed refrigerant using the mixed refrigerant expansion means; Further cooling the nitrogen by expanding the high pressure nitrogen using the nitrogen expansion means; Liquefying natural gas by heat-exchanging the natural gas with a cooled mixed refrigerant and nitrogen in a cold box; There is provided a natural gas liquefaction method comprising a.

또한, 본 발명의 또 다른 측면에 따르면, 복수의 성분이 혼합되어 이루어진 혼합냉매 사이클과 질소 팽창 사이클을 이용하여 천연가스 액화에 필요한 냉열을 발생시키는 천연가스 액화방법으로서, 혼합냉매 사이클에서 고압의 혼합냉매를 팽창시켜 극저온 상태로 혼합냉매를 냉각시키고, 질소 팽창 사이클에서 고압의 질소를 팽창시켜 극저온 상태로 질소를 냉각시키고, 극저온 상태의 혼합냉매 및 질소로부터 천연가스에 냉열을 공급하여 천연가스를 응축시키는 것을 특징으로 하는 천연가스 액화방법이 제공된다.In addition, according to another aspect of the present invention, a natural gas liquefaction method for generating a cooling heat required for natural gas liquefaction using a mixed refrigerant cycle and a nitrogen expansion cycle composed of a plurality of components, the mixing of high pressure in the mixed refrigerant cycle By expanding the refrigerant to cool the mixed refrigerant in a cryogenic state, by expanding the high pressure nitrogen in the nitrogen expansion cycle to cool the nitrogen in the cryogenic state, by supplying cold heat to the natural gas from the cryogenic mixed refrigerant and nitrogen to condense natural gas It is provided a natural gas liquefaction method characterized in that.

상술한 바와 같은 본 발명에 의하면, 혼합냉매 사이클 및 질소 팽창 사이클을 이용하여 전체 시스템의 구성을 간략화하고 액화 공정을 효율적으로 실시할 수 있도록 한 천연가스 액화방법 및 장치가 제공될 수 있다.According to the present invention as described above, it is possible to provide a natural gas liquefaction method and apparatus to simplify the configuration of the entire system and to efficiently perform the liquefaction process using a mixed refrigerant cycle and nitrogen expansion cycle.

또한, 본 발명의 천연가스 액화방법 및 장치에 의하면, 종래 효율이 낮은 냉매 팽창 공정의 저효율성을 보완하여 고효율화할 수 있으며, 질소를 이용한 냉매 팽창 공정을 함께 이용함으로써 불안전한 운전성능을 보완할 수 있게 된다.In addition, according to the natural gas liquefaction method and apparatus of the present invention, it is possible to improve the efficiency by supplementing the low efficiency of the conventional low efficiency refrigerant expansion process, by using the refrigerant expansion process using nitrogen together to compensate for unsafe operation performance. Will be.

이하, 본 발명의 바람직한 실시예에 따른 천연가스 액화방법 및 장치를 도면을 참조하여 상세하게 설명한다.Hereinafter, a natural gas liquefaction method and apparatus according to a preferred embodiment of the present invention will be described in detail with reference to the drawings.

도 1에는 본 발명에 따라서 혼합냉매 사이클 및 질소 팽창 사이클을 이용하는 천연가스 액화방법 및 장치를 설명하기 위한 개념도가 도시되어 있다. 본 발명에 따른 천연가스 액화장치는, 육상이나 근해에 설치되는 LNG 플랜트, LNG 수송선과 같은 선박, 그리고 FPSO (Floating, Production, Storage and Offloading)와 같은 해상 구조물 등에 설치되어 사용될 수 있다. LNG FPSO는, 생산된 천연가스를 해상에서 직접 액화시켜 LNG 저장탱크 내에 저장하고, 필요시 이 LNG 저장탱크 내에 저장된 LNG를 LNG 수송선으로 옮겨싣기 위해 사용되는 부유식 해상 구조물이다.1 is a conceptual diagram illustrating a natural gas liquefaction method and apparatus using a mixed refrigerant cycle and a nitrogen expansion cycle according to the present invention. The natural gas liquefaction apparatus according to the present invention may be installed and used in LNG plants, ships such as LNG carriers, and offshore structures such as FPSOs (Floating, Production, Storage and Offloading) installed on land or offshore. The LNG FPSO is a floating offshore structure used to directly liquefy the produced natural gas at sea and store it in an LNG storage tank, and, if necessary, to transfer LNG stored in the LNG storage tank to an LNG carrier.

도 1에 도시된 바와 같이, 본 발명에 따른 천연가스 액화장치에 따르면, 콜드 박스(cold box)(10) 내에서 이루어지는 냉매와의 열교환을 통하여 천연가스(NG; Natural Gas)는 액화되어 액화 천연가스(LNG; Liquefied Natural Gas)가 만들어진다.As shown in FIG. 1, according to the natural gas liquefaction apparatus according to the present invention, natural gas (NG) is liquefied through heat exchange with a refrigerant formed in a cold box 10. Liquefied Natural Gas (LNG) is produced.

콜드 박스(10)는 하나 이상의 열교환기(도시생략)로 이루어질 수 있으며, 천연가스 액화공정이 수행되는 콜드 박스(10)의 구체적인 구성은 본 발명을 한정하지 않으며 종래 사용되고 있는 어떠한 구성의 것이라도 사용할 수 있으므로 더 이상 상세하게 설명하지 않는다. 대략 60barg, 40℃의 고압 고온 상태로 콜드 박스(10)에 공급된 천연가스는, 혼합냉매 사이클(20) 및 질소 팽창 사이클(30)에서 극저온으로 냉각된 혼합냉매로부터 냉열을 공급받아 액화된다.The cold box 10 may be formed of one or more heat exchangers (not shown), and the specific configuration of the cold box 10 in which the natural gas liquefaction process is performed does not limit the present invention and may be used in any configuration conventionally used. This may not be described in further detail. The natural gas supplied to the cold box 10 at a high pressure and high temperature of about 60 barg and 40 ° C is liquefied by receiving cold heat from the mixed refrigerant cooled to cryogenic temperature in the mixed refrigerant cycle 20 and the nitrogen expansion cycle 30.

혼합냉매 사이클(20)의 혼합냉매는, 메탄, 에탄올, 프로판, 부탄, 질소 등의 성분들이 일정 비율로 혼합되어 이루어진 것이다. 각 성분들의 혼합 비율은 공정 조건에 따라 정해질 수 있다.The mixed refrigerant of the mixed refrigerant cycle 20 is obtained by mixing components such as methane, ethanol, propane, butane and nitrogen at a predetermined ratio. The mixing ratio of each component may be determined according to the process conditions.

본 발명에 따른 혼합냉매 사이클(20)에 있어서, 혼합냉매 압력용기(21) 내에는 상술한 혼합냉매가 수용되어 있다. 혼합냉매 압력용기(21) 내의 혼합냉매는 도시하지 않은 이송펌프, 조절밸브 등에 의해 필요한 양이 제1 혼합냉매 압축기(22)로 공급될 수 있다.In the mixed refrigerant cycle 20 according to the present invention, the mixed refrigerant described above is accommodated in the mixed refrigerant pressure vessel 21. The mixed refrigerant in the mixed refrigerant pressure vessel 21 may be supplied to the first mixed refrigerant compressor 22 in a required amount by a transfer pump, a control valve, or the like (not shown).

제1 혼합냉매 압축기(22)에서 압축되어 온도 및 압력이 상승한 혼합냉매는, 제1 혼합냉매 열교환기(23)에서 열교환됨으로써 냉각된다. 제1 혼합냉매 열교환기(23)에서 혼합냉매의 온도를 낮추기 위해서는 해수(혹은 담수)나 공기를 사용할 수 있다.The mixed refrigerant compressed by the first mixed refrigerant compressor 22 and the temperature and the pressure are increased is cooled by heat exchange in the first mixed refrigerant heat exchanger (23). In order to lower the temperature of the mixed refrigerant in the first mixed refrigerant heat exchanger (23), sea water (or fresh water) or air may be used.

제1 혼합냉매 열교환기(23)를 통과하면서 냉각된 혼합냉매는 계속해서 제2 혼합냉매 압축기(24)에 공급된다. 제2 혼합냉매 압축기(24)에서 더욱 고압으로 압축된 혼합냉매는 혼합냉매 응축기로서 작용하는 제2 혼합냉매 열교환기(25)에서 냉각되어 부분적으로 응축된다. 혼합냉매 응축기로서의 제2 혼합냉매 열교환기(25)에서 혼합냉매의 온도를 낮추어 부분적으로 응축시키기 위해서는 해수(혹은 담수)나 공기를 사용할 수 있다.The mixed refrigerant cooled while passing through the first mixed refrigerant heat exchanger (23) is continuously supplied to the second mixed refrigerant compressor (24). The mixed refrigerant compressed at a higher pressure in the second mixed refrigerant compressor 24 is cooled and partially condensed in the second mixed refrigerant heat exchanger 25 serving as the mixed refrigerant condenser. Sea water (or fresh water) or air may be used to lower the temperature of the mixed refrigerant and partially condense it in the second mixed refrigerant heat exchanger 25 as the mixed refrigerant condenser.

부분적으로 응축된 혼합냉매는 기액 분리기(26)로 공급되며, 이 기액 분리기(26) 내에서 기상(氣相)의 혼합냉매와 액상(液相)의 혼합냉매로 분리되어 각각 콜드 박스(10)에 공급된다.The partially condensed mixed refrigerant is supplied to the gas-liquid separator 26, and is separated into the gaseous-phase mixed refrigerant and the liquid-phase mixed refrigerant in the gas-liquid separator 26, respectively, to be cold box 10. Supplied to.

콜드 박스(10)에 공급된 혼합냉매는 팽창수단으로서의 제1 혼합냉매 팽창밸브(27) 및 제2 혼합냉매 팽창밸브(28)를 통과하면서 팽창됨으로써 온도가 하강되어 극저온까지 냉각된다. 콜드 박스(10) 내에서, 극저온으로 냉각된 혼합냉매와의 열교환에 의해 천연가스는 액화될 수 있다.The mixed refrigerant supplied to the cold box 10 is expanded while passing through the first mixed refrigerant expansion valve 27 and the second mixed refrigerant expansion valve 28 as expansion means, so that the temperature is lowered and cooled to cryogenic temperatures. In the cold box 10, natural gas may be liquefied by heat exchange with a cryogenic mixed refrigerant.

콜드 박스(10) 내에서 천연가스에 냉열을 전달함으로써 가열된 혼합냉매는 압력 용기(21)로 복귀되거나, 제1 혼합냉매 압축기(22)로 공급될 수 있다.The mixed refrigerant heated by transferring cold heat to the natural gas in the cold box 10 may be returned to the pressure vessel 21 or supplied to the first mixed refrigerant compressor 22.

또한, 본 발명에 따른 질소 팽창 사이클(30)에 있어서, 도시하지는 않았지만, 냉매로서 사용되는 질소를 수용하는 질소 압력용기(도시생략)가 구비될 수 있다. 질소 압력용기 내의 질소는 도시하지 않은 이송펌프, 조절밸브 등에 의해 필요한 양이 제1 질소 압축기(31)로 공급될 수 있다.In addition, in the nitrogen expansion cycle 30 according to the present invention, although not shown, a nitrogen pressure vessel (not shown) for accommodating nitrogen used as a refrigerant may be provided. Nitrogen in the nitrogen pressure vessel may be supplied to the first nitrogen compressor 31 in a required amount by a transfer pump, a control valve, or the like (not shown).

제1 질소 압축기(31)에서 압축되어 온도 및 압력이 상승한 질소는, 제1 질소 열교환기(32)에서 열교환됨으로써 냉각된다. 제1 질소 열교환기(32)에서 질소의 온도를 낮추기 위해서는 해수(혹은 담수)나 공기를 사용할 수 있다.Nitrogen compressed by the first nitrogen compressor 31 and having increased in temperature and pressure is cooled by heat exchange in the first nitrogen heat exchanger 32. In order to lower the temperature of nitrogen in the first nitrogen heat exchanger 32, sea water (or fresh water) or air may be used.

제1 질소 열교환기(31)를 통과하면서 냉각된 질소는 계속해서 제2 질소 압축기(33)에 공급된다. 제2 질소 압축기(33)에서 더욱 고압으로 압축된 질소는 제2 질소 열교환기(34)에서 냉각된다. 제2 질소 열교환기(34)에서 질소의 온도를 낮추기 위해서는 해수(혹은 담수)나 공기를 사용할 수 있다.Nitrogen cooled while passing through the first nitrogen heat exchanger 31 is continuously supplied to the second nitrogen compressor 33. Nitrogen compressed at a higher pressure in the second nitrogen compressor 33 is cooled in the second nitrogen heat exchanger 34. In order to lower the temperature of nitrogen in the second nitrogen heat exchanger 34, sea water (or fresh water) or air may be used.

제2 질소 열교환기(33)를 통과하면서 냉각된 질소는 계속해서 제3 질소 압축기(35)에 공급된다. 제3 질소 압축기(35)에서 더욱 고압으로 압축된 질소는 제3 질소 열교환기(36)에서 냉각된다. 제3 질소 열교환기(36)에서 질소의 온도를 낮추기 위해서는 해수(혹은 담수)나 공기를 사용할 수 있다.Nitrogen cooled while passing through the second nitrogen heat exchanger 33 is continuously supplied to the third nitrogen compressor 35. Nitrogen compressed at a higher pressure in the third nitrogen compressor 35 is cooled in the third nitrogen heat exchanger 36. In order to lower the temperature of nitrogen in the third nitrogen heat exchanger 36, sea water (or fresh water) or air may be used.

이와 같이 3단의 압축기 및 열교환기를 순차적으로 통과하면서 고압으로 압축된 질소는 콜드 박스(10)에 공급된다.As described above, nitrogen compressed at high pressure is sequentially supplied to the cold box 10 while passing through the three stage compressor and the heat exchanger.

콜드 박스(10)에 공급된 질소는 팽창수단으로서의 질소 팽창터빈(37)을 통과하면서 팽창됨으로써 온도가 하강되어 극저온까지 냉각된다. 콜드 박스(10) 내에서, 극저온으로 냉각된 질소와의 열교환에 의해 천연가스는 액화될 수 있다.Nitrogen supplied to the cold box 10 expands while passing through the nitrogen expansion turbine 37 as expansion means, thereby lowering the temperature and cooling to cryogenic temperatures. In the cold box 10, natural gas may be liquefied by heat exchange with nitrogen cooled to cryogenic temperatures.

콜드 박스(10) 내에서 천연가스에 냉열을 전달함으로써 가열된 질소는 상술한 질소 압력용기(도시생략)로 복귀되거나, 제1 질소 압축기(31)로 공급될 수 있다.Nitrogen heated by transferring cold heat to natural gas in the cold box 10 may be returned to the above-described nitrogen pressure vessel (not shown) or may be supplied to the first nitrogen compressor 31.

이상과 같이 본 발명에 따른 혼합냉매 사이클 및 질소 팽창 사이클을 이용한 천연가스 액화방법 및 장치를, 예시된 도면을 참조하여 설명하였으나, 본 발명은 이상에서 설명된 실시예와 도면에 의해 한정되지 않으며, 특허청구범위 내에서 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자들에 의해 다양한 수정 및 변형이 이루어질 수 있음은 물론이다.As described above, the natural gas liquefaction method and apparatus using the mixed refrigerant cycle and the nitrogen expansion cycle according to the present invention have been described with reference to the illustrated drawings, but the present invention is not limited to the embodiments and drawings described above. Various modifications and variations can be made by those skilled in the art within the scope of the claims.

도 1은 본 발명에 따라서 혼합냉매 사이클 및 질소 팽창 사이클을 이용하는 천연가스 액화방법 및 장치를 설명하기 위한 개념도이다.1 is a conceptual diagram illustrating a natural gas liquefaction method and apparatus using a mixed refrigerant cycle and a nitrogen expansion cycle according to the present invention.

< 도면의 주요 부분에 대한 부호의 설명><Description of the reference numerals for the main parts of the drawings>

10 : 콜드 박스 20 : 혼합냉매 사이클10: cold box 20: mixed refrigerant cycle

21 : 압력 용기 22 : 제1 혼합냉매 압축기21 pressure vessel 22 first mixed refrigerant compressor

23 : 제1 혼합냉매 열교환기 24 : 제2 혼합냉매 압축기23: first mixed refrigerant heat exchanger 24: second mixed refrigerant compressor

25 : 혼합냉매 응축기로서의 제2 혼합냉매 열교환기25: second mixed refrigerant heat exchanger as the mixed refrigerant condenser

26 : 기액 분리기 27 : 제1 혼합냉매 팽창밸브26: gas-liquid separator 27: the first mixed refrigerant expansion valve

28 : 제2 혼합냉매 팽창밸브 30 : 질소 팽창 사이클28: second mixed refrigerant expansion valve 30: nitrogen expansion cycle

31 : 제1 질소 압축기 32 : 제1 질소 열교환기31 first nitrogen compressor 32 first nitrogen heat exchanger

33 : 제2 질소 압축기 34 : 제2 질소 열교환기33: second nitrogen compressor 34: second nitrogen heat exchanger

35 : 제3 질소 압축기 36 : 제3 질소 열교환기35: third nitrogen compressor 36: third nitrogen heat exchanger

37 : 질소 팽창터빈37: nitrogen expansion turbine

Claims (8)

복수의 성분이 혼합되어 이루어진 혼합냉매 및 질소 냉매를 이용하여 천연가스를 액화시키기 위한 천연가스 액화장치로서, A natural gas liquefaction apparatus for liquefying natural gas using a mixed refrigerant and a nitrogen refrigerant consisting of a plurality of components, 혼합냉매 및 질소 냉매와의 열교환에 의해 천연가스를 액화시키는 콜드 박스와; A cold box for liquefying natural gas by heat exchange with a mixed refrigerant and a nitrogen refrigerant; 혼합냉매를 냉각시켜 상기 콜드 박스에 공급하기 위한 혼합냉매 사이클과; A mixed refrigerant cycle for cooling the mixed refrigerant to supply the cold box; 질소를 냉각시켜 상기 콜드 박스에 공급하기 위한 질소 팽창 사이클; A nitrogen expansion cycle for cooling nitrogen and supplying it to the cold box; 을 포함하는 것을 특징으로 하는 천연가스 액화장치.Natural gas liquefaction apparatus comprising a. 청구항 1에 있어서, The method according to claim 1, 상기 혼합냉매 사이클은, 하나 이상의 혼합냉매 압축기와, 상기 혼합냉매 압축기의 하류측에 각각 설치되어 압축된 혼합냉매를 냉각시키는 하나 이상의 혼합냉매 열교환기와, 냉각된 고압의 혼합냉매를 팽창시켜 극저온으로 더욱 냉각시키는 팽창수단을 포함하는 것을 특징으로 하는 천연가스 액화장치.The mixed refrigerant cycle may include one or more mixed refrigerant compressors, one or more mixed refrigerant heat exchangers respectively installed at a downstream side of the mixed refrigerant compressor to cool the compressed mixed refrigerant, and expand the cooled high-pressure mixed refrigerant to further cryogenic temperatures. Natural gas liquefaction apparatus comprising an expansion means for cooling. 청구항 1에 있어서, The method according to claim 1, 상기 질소 팽창 사이클은, 하나 이상의 질소 압축기와, 상기 질소 압축기의 하류측에 각각 설치되어 압축된 질소를 냉각시키는 하나 이상의 질소 열교환기와, 냉각된 고압의 질소를 팽창시켜 극저온으로 더욱 냉각시키는 팽창수단을 포함하는 것을 특징으로 하는 천연가스 액화장치.The nitrogen expansion cycle includes one or more nitrogen compressors, one or more nitrogen heat exchangers respectively installed downstream of the nitrogen compressor to cool compressed nitrogen, and expansion means for expanding the cooled high pressure nitrogen to further cool the cryogenic temperature. Natural gas liquefaction apparatus comprising a. 청구항 1에 있어서, The method according to claim 1, 상기 혼합냉매 사이클은, 혼합냉매를 압축시키는 제1 혼합냉매 압축기와, 상기 제1 혼합냉매 압축기에서 압축된 혼합냉매를 냉각시키는 제1 혼합냉매 열교환기와, 상기 제1 혼합냉매 열교환기에서 냉각된 혼합냉매를 더욱 고압으로 압축시키는 제2 혼합냉매 압축기와, 상기 제2 혼합냉매 압축기에서 고압으로 압축된 혼합냉매를 일부 액화시키는 제2 혼합냉매 열교환기와, 일부 액화된 혼합냉매를 기상과 액상으로 분리하는 기액 분리기와, 고압의 혼합냉매를 팽창시켜 극저온 상태로 냉각시키는 팽창밸브를 포함하는 것을 특징으로 하는 천연가스 액화장치.The mixed refrigerant cycle may include: a first mixed refrigerant compressor for compressing the mixed refrigerant, a first mixed refrigerant heat exchanger for cooling the mixed refrigerant compressed by the first mixed refrigerant compressor, and a mixed mixture cooled in the first mixed refrigerant heat exchanger A second mixed refrigerant compressor for further compressing the refrigerant to a higher pressure, a second mixed refrigerant heat exchanger for partially liquefying the mixed refrigerant compressed to high pressure in the second mixed refrigerant compressor, and separating the liquefied mixed refrigerant into a gaseous phase and a liquid phase And a gas-liquid separator and an expansion valve for expanding the high-pressure mixed refrigerant and cooling it to a cryogenic state. 청구항 1에 있어서, The method according to claim 1, 상기 질소 팽창 사이클은, 질소를 압축시키는 제1 내지 제3 질소 압축기와, 상기 제1 내지 제3 질소 압축기 각각의 하류측에 설치되어 압축된 질소를 냉각시키는 제1 내지 제3 질소 열교환기와, 고압의 질소를 팽창시켜 극저온 상태로 냉각시키는 팽창터빈을 포함하는 것을 특징으로 하는 천연가스 액화장치.The nitrogen expansion cycle includes a first to third nitrogen compressor for compressing nitrogen, a first to third nitrogen heat exchanger for cooling the compressed nitrogen installed downstream of each of the first to third nitrogen compressors, and a high pressure. Natural gas liquefaction apparatus comprising an expansion turbine for cooling to a cryogenic state by expanding the nitrogen. 청구항 4에 있어서, The method according to claim 4, 상기 혼합냉매 사이클은, 상기 제1 혼합냉매 압축기에 공급될 혼합냉매를 수용하는 압력 용기를 더 포함하는 것을 특징으로 하는 천연가스 액화장치.The mixed refrigerant cycle, the natural gas liquefaction apparatus further comprises a pressure vessel for receiving the mixed refrigerant to be supplied to the first mixed refrigerant compressor. 복수의 성분이 혼합되어 이루어진 혼합냉매 및 질소 냉매를 이용하여 천연가스를 액화시키기 위한 천연가스 액화방법으로서, A natural gas liquefaction method for liquefying natural gas using a mixed refrigerant and a nitrogen refrigerant consisting of a plurality of components, 혼합냉매 압축기 및 혼합냉매 열교환기를 이용하여 혼합냉매를 압축 및 냉각함으로써 고압의 혼합냉매를 얻는 단계와; Obtaining a high pressure mixed refrigerant by compressing and cooling the mixed refrigerant using a mixed refrigerant compressor and a mixed refrigerant heat exchanger; 질소 압축기 및 질소 열교환기를 이용하여 질소를 압축 및 냉각함으로써 고압의 질소를 얻는 단계와; Obtaining nitrogen at high pressure by compressing and cooling nitrogen using a nitrogen compressor and a nitrogen heat exchanger; 혼합냉매 팽창수단을 이용하여 고압의 혼합냉매를 팽창시킴으로써 혼합냉매를 더욱 냉각하는 단계와; Further cooling the mixed refrigerant by expanding the high pressure mixed refrigerant using the mixed refrigerant expansion means; 질소 팽창수단을 이용하여 고압의 질소를 팽창시킴으로써 질소를 더욱 냉각하는 단계와; Further cooling the nitrogen by expanding the high pressure nitrogen using the nitrogen expansion means; 콜드 박스 내에서 천연가스를 냉각된 혼합냉매 및 질소와 열교환시킴으로써 천연가스를 액화시키는 단계; Liquefying natural gas by heat-exchanging the natural gas with a cooled mixed refrigerant and nitrogen in a cold box; 를 포함하는 것을 특징으로 하는 천연가스 액화방법.Natural gas liquefaction method comprising a. 복수의 성분이 혼합되어 이루어진 혼합냉매 사이클과 질소 팽창 사이클을 이용하여 천연가스 액화에 필요한 냉열을 발생시키는 천연가스 액화방법으로서, A natural gas liquefaction method that generates cooling heat required for natural gas liquefaction by using a mixed refrigerant cycle and a nitrogen expansion cycle in which a plurality of components are mixed, 혼합냉매 사이클에서 고압의 혼합냉매를 팽창시켜 극저온 상태로 혼합냉매를 냉각시키고, 질소 팽창 사이클에서 고압의 질소를 팽창시켜 극저온 상태로 질소를 냉각시키고, 극저온 상태의 혼합냉매 및 질소로부터 천연가스에 냉열을 공급하여 천연가스를 응축시키는 것을 특징으로 하는 천연가스 액화방법.In the mixed refrigerant cycle, the high pressure mixed refrigerant is expanded to cool the mixed refrigerant in the cryogenic state, and in the nitrogen expansion cycle, the high pressure nitrogen is expanded to cool the nitrogen in the cryogenic state, and the cold heat is mixed from the cryogenic mixed refrigerant and nitrogen to the natural gas. Natural gas liquefaction method characterized in that the supply of condensed natural gas.
KR1020080036456A 2008-04-21 2008-04-21 Natural gas liquefaction method and apparatus using a mixed refrigerant cycle and a nitrogen expansion cycle KR20090110964A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020080036456A KR20090110964A (en) 2008-04-21 2008-04-21 Natural gas liquefaction method and apparatus using a mixed refrigerant cycle and a nitrogen expansion cycle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020080036456A KR20090110964A (en) 2008-04-21 2008-04-21 Natural gas liquefaction method and apparatus using a mixed refrigerant cycle and a nitrogen expansion cycle

Publications (1)

Publication Number Publication Date
KR20090110964A true KR20090110964A (en) 2009-10-26

Family

ID=41538777

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020080036456A KR20090110964A (en) 2008-04-21 2008-04-21 Natural gas liquefaction method and apparatus using a mixed refrigerant cycle and a nitrogen expansion cycle

Country Status (1)

Country Link
KR (1) KR20090110964A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101027809B1 (en) * 2010-02-12 2011-04-07 한솔이엠이(주) Manufacturing apparatus for liquified bio methane
CN102374754A (en) * 2011-09-24 2012-03-14 辽宁哈深冷气体液化设备有限公司 Equipment and method for preparing liquid natural gas and carbon oxide from coke oven gas
CN104807287A (en) * 2015-05-22 2015-07-29 中国石油集团工程设计有限责任公司 Small natural gas liquefaction and refrigeration system and small natural gas liquefaction and refrigeration method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101027809B1 (en) * 2010-02-12 2011-04-07 한솔이엠이(주) Manufacturing apparatus for liquified bio methane
CN102374754A (en) * 2011-09-24 2012-03-14 辽宁哈深冷气体液化设备有限公司 Equipment and method for preparing liquid natural gas and carbon oxide from coke oven gas
CN102374754B (en) * 2011-09-24 2015-08-19 辽宁哈深冷气体液化设备有限公司 The Apparatus and method for of liquified natural gas and carbon monoxide is produced from coke-stove gas
CN104807287A (en) * 2015-05-22 2015-07-29 中国石油集团工程设计有限责任公司 Small natural gas liquefaction and refrigeration system and small natural gas liquefaction and refrigeration method

Similar Documents

Publication Publication Date Title
KR101145303B1 (en) Natural gas liquefaction method and equipment for LNG FPSO
KR101609575B1 (en) Vessel
CN108291767B (en) Method for liquefaction of natural gas on LNG carriers storing liquid nitrogen
CN108369060B (en) Expander-based LNG production process enhanced with liquid nitrogen
US20210061434A1 (en) Boil-off gas re-liquefying device and method for ship
JP6553714B2 (en) Boil-off gas cooling method and apparatus
KR101078645B1 (en) Lng/lpg bog reliquefaction apparatus and method
KR20110094012A (en) Method for producing a stream of subcooled liquefied natural gas using a natural gas feedstream, and associated facility
KR20090110965A (en) Natural gas liquefaction method and apparatus using a methane expansion cycle, a mixed refrigerant cycle, and a nitrogen expansion cycle
KR101742285B1 (en) BOG Re-liquefaction Apparatus and Method for Vessel
WO2016151636A1 (en) Production system and production method for natural gas
CN109070977A (en) ship
JP2021516325A (en) Methods and systems for liquefaction of natural gas using liquid nitrogen
KR20090110964A (en) Natural gas liquefaction method and apparatus using a mixed refrigerant cycle and a nitrogen expansion cycle
KR200493118Y1 (en) Reliquefaction System of BOG for Ship
KR20110121134A (en) Method and apparatus for liquefying natural gas
US12066219B2 (en) Cooling system
KR101623092B1 (en) Method and apparatus for reliquefying boil-off gas using cold-heat power generation
KR20120005158A (en) Method and apparatus for liquefying natural gas
KR20090109713A (en) Natural gas liquefaction method and apparatus using a mixed refrigerant cycle
KR20150030938A (en) Apparatus for the reliquefaction of boil-off gas
KR102595979B1 (en) Boil-Off Gas Reliquefaction System and Method for Ship
KR102538530B1 (en) Liquefaction system
KR102452416B1 (en) Boil-Off Gas Treatment System and Method for Ship
KR102370609B1 (en) Boil-Off Gas Reliquefaction System and Method for Ship

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
WITB Written withdrawal of application