KR102175368B1 - Fuel gas supply system - Google Patents

Fuel gas supply system Download PDF

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KR102175368B1
KR102175368B1 KR1020180162358A KR20180162358A KR102175368B1 KR 102175368 B1 KR102175368 B1 KR 102175368B1 KR 1020180162358 A KR1020180162358 A KR 1020180162358A KR 20180162358 A KR20180162358 A KR 20180162358A KR 102175368 B1 KR102175368 B1 KR 102175368B1
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South Korea
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gas
lpg
boil
lng
heat exchange
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KR1020180162358A
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Korean (ko)
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KR20200073790A (en
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박진성
조일환
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주식회사 포스코
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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
    • F25J1/0002—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
    • 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
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0047—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle
    • F25J1/0052—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
    • F25J1/008—Hydrocarbons
    • F25J1/009—Hydrocarbons with four or more carbon atoms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0244—Operation; Control and regulation; Instrumentation
    • F25J1/0254—Operation; Control and regulation; Instrumentation controlling particular process parameter, e.g. pressure, temperature
    • 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
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0309—Heat exchange with the fluid by heating using another fluid
    • F17C2227/0316—Water heating
    • F17C2227/0318—Water heating using seawater
    • 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
    • F25J2290/12—Particular process parameters like pressure, temperature, ratios

Abstract

LPG 증발가스의 재액화 시스템이 개시된다. 본 발명의 실시 예에 따른 LPG 증발가스의 재액화 시스템은 LPG를 저장하는 제1저장탱크로부터 공급받은 LPG 증발가스를 압축시키는 LPG압축기; 압축된 LPG 증발가스와 LNG를 저장하는 제2저장탱크로부터 공급받은 LNG 간 열교환을 수행하여, LPG 증발가스를 액화시키는 열교환부; 열교환부에 의해 액화된 LPG 증발가스의 온도를 측정하는 온도센서; LPG 증발가스와의 열교환을 위해 열교환부로 공급되는 LNG의 유량을 조절하는 유량조절밸브; 측정된 LPG 증발가스의 온도를 기초로 유량조절밸브에 의해 LPG 증발가스와 열교환되는 LNG의 유량을 조절하여, 열교환부를 통해 LPG 증발가스가 최적의 조건에서 액화되도록 하는 제어부;를 포함한다.A system for reliquefaction of LPG boil-off gas is disclosed. The LPG boil-off gas reliquefaction system according to an embodiment of the present invention includes an LPG compressor for compressing the LPG boil-off gas supplied from the first storage tank for storing the LPG; A heat exchange unit for liquefying the LPG boil-off gas by performing heat exchange between the compressed LPG boil-off gas and the LNG supplied from the second storage tank for storing the LNG; A temperature sensor measuring the temperature of the LPG boil-off gas liquefied by the heat exchanger; A flow rate control valve for controlling the flow rate of LNG supplied to the heat exchange unit for heat exchange with the LPG boil-off gas; And a control unit for controlling the flow rate of LNG to be heat-exchanged with the LPG boil-off gas by a flow control valve based on the measured temperature of the LPG boil-off gas, so that the LPG boil-off gas is liquefied under optimal conditions through the heat exchange unit.

Description

LPG 증발가스의 재액화 시스템{FUEL GAS SUPPLY SYSTEM}LPG boil-off gas reliquefaction system {FUEL GAS SUPPLY SYSTEM}

본 발명은 LPG 증발가스의 재액화 시스템에 관한 것이다.The present invention relates to a system for reliquefaction of LPG boil-off gas.

LNG(Liquefied Natural Gas)는 메탄을 주성분으로 하고, 대략 ―161.5℃의 끊는점을 가지고 있으며, 통상적으로 그 부피를 1/600로 줄인 액화가스(Liquefied Gas) 상태로 변화되어 단열 처리된 저장탱크에 저장된다.LNG (Liquefied Natural Gas) is mainly composed of methane, has a boiling point of approximately -161.5℃, and is converted into a liquefied gas state with a volume reduced to 1/600. Is saved.

LPG(Liquefied Petroleum Gas)는 프로판, 부탄을 주성분으로 하고, 대략 ―42.1℃ 이하에서 액화되는 성질을 갖고 있다. LPG는 연료 가격의 경쟁력이 우수하고, 기존 연료의 대체 연료로서 그 우수성이 높이 평가되고 있다. 이에 최근에는 LPG를 공급받는 수요처가 증가하고 있으며, LNG와 마찬가지로 단열 처리된 저장탱크에 저장된다. LPG (Liquefied Petroleum Gas) is mainly composed of propane and butane, and has the property of being liquefied below -42.1℃. LPG has excellent fuel price competitiveness and is highly evaluated for its excellence as an alternative fuel to existing fuels. Accordingly, recently, the number of demand sources receiving LPG is increasing, and it is stored in insulated storage tanks like LNG.

그러나, 기존의 LNG 증발가스의 재액화 시스템에 비해 LPG 저장탱크 내부에서 발생하는 증발가스에 대한 효과적인 재액화 처리가 미흡한 실정이다. 관련기술로서, 한국공개특허 제10-2013-7035052호(2014.07.23, 공개)는 LPG 증발가스를 재액화시키는 방법을 제시한 바 있으나, LPG의 액화 특성을 충분히 활용하지 못한 측면이 있다.However, compared to the existing LNG boil-off gas re-liquefaction system, the effective re-liquefaction treatment for boil-off gas generated inside the LPG storage tank is insufficient. As a related technology, Korean Patent Laid-Open Publication No. 10-2013-7035052 (published on 23 July 2014) has suggested a method of re-liquefying the LPG boil-off gas, but there is a side that does not fully utilize the liquefaction characteristics of LPG.

한국공개특허 제10-2010-0102872호(2010.09.27. 공개일)Korean Patent Publication No. 10-2010-0102872 (2010.09.27. Publication date)

본 발명의 실시 예는 LPG의 액화 특성을 활용하여 효율적인 LPG 재액화를 수행하는 LPG 증발가스의 재액화 시스템을 제공하고자 한다.An embodiment of the present invention is to provide a system for re-liquefying LPG boil-off gas that efficiently performs LPG re-liquefaction by utilizing the liquefaction characteristics of LPG.

본 발명의 일 측면에 따르면, LPG를 저장하는 제1저장탱크로부터 공급받은 LPG 증발가스를 압축시키는 LPG압축기; 상기 압축된 LPG 증발가스와 LNG를 저장하는 제2저장탱크로부터 공급받은 LNG 간 열교환을 수행하여, 상기 LPG 증발가스를 액화시키는 열교환부; 상기 열교환부에 의해 액화된 LPG 증발가스의 온도를 측정하는 온도센서; LPG 증발가스와의 열교환을 위해 상기 열교환부로 공급되는 LNG의 유량을 조절하는 유량조절밸브; 상기 측정된 LPG 증발가스의 온도를 기초로 상기 유량조절밸브에 의해 상기 LPG 증발가스와 열교환되는 LNG의 유량을 조절하여, 상기 열교환부를 통해 상기 LPG 증발가스가 최적의 조건에서 액화되도록 하는 제어부;를 포함하는 LPG 증발가스의 재액화 시스템을 제공할 수 있다.According to an aspect of the present invention, the LPG compressor for compressing the LPG boil-off gas supplied from the first storage tank for storing the LPG; A heat exchange unit for liquefying the LPG boil-off gas by performing heat exchange between the compressed LPG boil-off gas and the LNG supplied from the second storage tank for storing the LNG; A temperature sensor measuring the temperature of the LPG boil-off gas liquefied by the heat exchanger; A flow control valve for controlling a flow rate of LNG supplied to the heat exchange unit for heat exchange with the LPG boil-off gas; A control unit for controlling the flow rate of LNG heat-exchanged with the LPG boil-off gas by the flow control valve based on the measured temperature of the LPG boil-off gas, so that the LPG boil-off gas is liquefied in an optimum condition through the heat exchange unit; It is possible to provide a reliquefaction system of the LPG boil-off gas containing.

상기 열교환부에 의해 열교환된 LNG는 기체성분으로 변환되고, 상기 변환된 기체성분을 감압시키는 감압밸브와, 상기 제2저장탱크로부터 공급된 LNG 증발가스를 압축시키는 LNG압축기와, 상기 감압된 기체성분과 상기 압축된 LNG 증발가스가 혼합된 혼합물과 상기 제2저장탱크로부터 공급된 LNG 간 열교환을 수행하여, 상기 혼합물을 액화시키는 재액화부와, 상기 액화된 혼합물을 가압하는 고압펌프와, 상기 가압된 혼합물을 해수와의 열교환에 의해 기화시켜 수요처로 공급하는 해수식기화기를 더 포함할 수 있다.The LNG heat-exchanged by the heat exchanger is converted to a gas component, a pressure reducing valve for decompressing the converted gas component, an LNG compressor for compressing the LNG boil-off gas supplied from the second storage tank, and the reduced gas component And a reliquefaction unit for liquefying the mixture by performing heat exchange between the mixture in which the compressed LNG boil-off gas is mixed and the LNG supplied from the second storage tank, a high-pressure pump for pressurizing the liquefied mixture, and the pressurized It may further include a seawater vaporizer that vaporizes the mixture by heat exchange with seawater and supplies it to a customer.

본 발명의 실시 예에 따른 LPG 증발가스의 재액화 시스템은 LPG의 액화 특성을 활용하여 효율적인 LPG 재액화를 수행할 수 있다.The LPG reliquefaction system according to an embodiment of the present invention may perform efficient LPG reliquefaction by utilizing the liquefaction characteristics of LPG.

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 that are not mentioned will be clearly understood by those skilled in the art from the description of the claims.

도 1은 본 발명의 실시 예에 따른 LPG 증발가스의 재액화 시스템을 도시한다.1 shows a system for re-liquefying LPG boil-off gas according to an embodiment of the present invention.

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

도 1을 참조하면, 본 발명의 실시 예에 따른 LPG 증발가스의 재액화 시스템(100)은 LPG를 저장하는 제1저장탱크(101)와, LNG를 저장하는 제2저장탱크(102)와, 제1저장탱크(101)에서 발생된 LPG 증발가스를 압축시키는 LPG압축기(110)와, LPG압축기(110)에 의해 압축된 LPG 증발가스와 제2저장탱크(102)로부터 공급된 LNG 간 열교환을 수행하여, LPG 증발가스를 액화시키는 열교환부(120)를 포함한다.Referring to FIG. 1, the LPG boil-off gas reliquefaction system 100 according to an embodiment of the present invention includes a first storage tank 101 for storing LPG, a second storage tank 102 for storing LNG, and The LPG compressor 110 compressing the LPG boil-off gas generated in the first storage tank 101, and the LPG boil-off gas compressed by the LPG compressor 110 and the LNG supplied from the second storage tank 102 By performing, it includes a heat exchange unit 120 to liquefy the LPG boil-off gas.

또, LPG 증발가스의 재액화 시스템(100)은 열교환부(120)에 의해 액화된 LPG 증발가스의 온도를 측정하는 온도센서(130)와, LPG 증발가스와의 열교환을 위해 열교환부(120)로 공급되는 LNG의 유량을 조절하는 유량조절밸브(140)와, 온도센서(130)에 의해 측정된 LPG 증발가스의 온도를 기초로 유량조절밸브(140)에 의해 상술한 LPG 증발가스와 열교환되는 LNG의 유량을 조절하여, 열교환부(120)를 통해 LPG 증발가스가 최적의 조건에서 액화되도록 하는 제어부(150)를 포함한다.In addition, the LPG boil-off gas reliquefaction system 100 includes a temperature sensor 130 that measures the temperature of the LPG boil-off gas liquefied by the heat exchange unit 120, and a heat exchange unit 120 for heat exchange with the LPG boil-off gas. The flow control valve 140 for controlling the flow rate of LNG supplied to the flow rate control valve 140 and the flow control valve 140 based on the temperature of the LPG boil-off gas measured by the temperature sensor 130 heat exchange with the above-described LPG boil-off gas. It includes a control unit 150 to adjust the flow rate of LNG, so that the LPG boil-off gas is liquefied in an optimal condition through the heat exchange unit 120.

또, LPG 증발가스의 재액화 시스템(100)은 열교환부(120)에 의해 열교환되어 기체성분으로 변환된 LNG를 감압시키는 감압밸브(160)와, 제2저장탱크(102)로부터 공급된 LNG 증발가스를 압축시키는 LNG압축기(170)와, 감압밸브(160)에 의해 감압된 상기 기체성분과 LNG압축기(170)에 의해 압축된 LNG 증발가스가 혼합된 혼합물과 제2저장탱크(102)로부터 공급된 LNG 간 열교환을 수행하여, 해당 혼합물을 액화시키는 재액화부(180)와, 재액화부(180)에 의해 액화된 혼합물을 가압하는 고압펌프(190)와, 고압펌프(190)에 의해 가압된 혼합물을 해수와의 열교환에 의해 기화시켜 수요처(108)로 공급하는 해수식기화기(195)를 포함한다.In addition, the LPG boil-off gas re-liquefaction system 100 includes a pressure reducing valve 160 that depressurizes LNG converted into gaseous components by heat exchange by the heat exchange unit 120, and LNG evaporation supplied from the second storage tank 102. A mixture of the LNG compressor 170 for compressing gas, the gas component decompressed by the pressure reducing valve 160 and the LNG boil-off gas compressed by the LNG compressor 170 and supplied from the second storage tank 102 A reliquefaction unit 180 for liquefying the mixture by performing heat exchange between the LNG, a high pressure pump 190 for pressurizing the mixture liquefied by the reliquefaction unit 180, and a mixture pressurized by the high pressure pump 190 And a seawater vaporizer 195 that vaporizes by heat exchange with seawater and supplies it to the customer 108.

이하, 상술한 각 구성에 대해서 구체적으로 설명한다.Hereinafter, each configuration described above will be described in detail.

제1저장탱크(101)는 LPG를 저장하고, 제1공급라인(L1)을 통해 열교환부(120) 쪽으로 LPG 증발가스를 공급한다. 열교환부(120)를 거쳐 액화된 LPG 증발가스는 제1공급라인(L1)을 통해 제1저장탱크(101)에 회수된다.The first storage tank 101 stores LPG and supplies LPG boil-off gas to the heat exchange unit 120 through the first supply line L1. The LPG boil-off gas liquefied through the heat exchange unit 120 is recovered to the first storage tank 101 through the first supply line L1.

제1공급라인(L1)에는 제1저장탱크(101)로부터 공급된 LPG 증발가스에 함유된 액체성분을 분리시키기 위한 제1액분리기(103)와, 액체성분이 분리된 LPG 증발가스를 설정 압력에 따라 압축시키는 LPG압축기(110)가 마련된다.In the first supply line (L1), a first liquid separator 103 for separating the liquid component contained in the LPG vaporized gas supplied from the first storage tank 101, and the LPG vaporized gas from which the liquid component is separated are set at a set pressure. LPG compressor 110 is provided to compress according to.

LPG압축기(110)에 의해 압축된 LPG 증발가스는 열교환부(120)로 공급되기 이전에 제1공급라인(L1)에 마련된 다단의 유수분리기(104,105)를 거칠 수 있다.The LPG boil-off gas compressed by the LPG compressor 110 may pass through the multi-stage oil-water separators 104 and 105 provided in the first supply line L1 before being supplied to the heat exchange unit 120.

유수분리기(104,105)는 LPG압축기(110)에 의해 압축된 LPG 증발가스에 함유된 유분을 제거한다.The oil-water separators 104 and 105 remove oil contained in the LPG boil-off gas compressed by the LPG compressor 110.

열교환부(120)는 LPG압축기(110)에 의해 압축된 후 유분이 제거된 상술한 LPG 증발가스와 제2저장탱크(102)로부터 공급된 LNG 간 열교환을 수행한다. The heat exchanger 120 performs heat exchange between the above-described LPG boil-off gas from which oil is removed after being compressed by the LPG compressor 110 and LNG supplied from the second storage tank 102.

제2저장탱크(102)로부터 열교환부(120) 쪽으로 공급되는 LNG는 제2공급라인(L2)을 통해 공급된다.LNG supplied from the second storage tank 102 toward the heat exchange unit 120 is supplied through the second supply line L2.

제2공급라인(L2)의 열교환부(120) 전단에는 유량조절밸브(140)가 마련된다.A flow control valve 140 is provided at the front end of the heat exchange unit 120 of the second supply line L2.

상술한 LPG는 프로판, 부탄을 주성분으로 하고, 대략 ―42.1℃ 이하에서 액화되는 성질을 갖고 있다. The LPG described above is mainly composed of propane and butane, and has a property of being liquefied at about -42.1°C or less.

이러한 특성을 이용하여 LPG 증발가스의 액화 효율을 최적화시키기 위해 제1공급라인(L1)의 열교환부(120) 후단에는 온도센서(130)가 마련되어, 열교환부(120)에 의해 액화된 LPG 증발가스의 온도를 측정한다.In order to optimize the liquefaction efficiency of the LPG boil-off gas using these characteristics, a temperature sensor 130 is provided at the rear end of the heat exchanger 120 of the first supply line L1, and the LPG boil-off gas liquefied by the heat exchanger 120 Measure the temperature of.

이때, 제어부(150)는 온도센서(130)에 의해 열교환부(120)에 의해 액화된 LPG 증발가스의 온도를 기초로 유량조절밸브(140)에 의해 상술한 LPG 증발가스와 열교환되는 LNG의 유량을 조절하여, 열교환부(120)를 통해 LPG 증발가스가 최적의 조건에서 액화되도록 한다. 이때, 대략 ―42.1℃ 이하에서 액화되는 성질을 가진 LPG의 액화 온도 특성에 맞추어 유량조절밸브(140)를 조절하여 LPG 증발가스와 열교환되는 LNG의 유량을 조절함으로써 열교환부(120)를 통해 LPG 증발가스가 최적의 조건에서 액화되도록 할 수 있다.At this time, the control unit 150 is based on the temperature of the LPG boil-off gas liquefied by the heat exchange unit 120 by the temperature sensor 130, the flow rate of LNG exchanged with the LPG boil-off gas described above by the flow control valve 140 By controlling, the LPG boil-off gas is liquefied under optimal conditions through the heat exchanger 120. At this time, LPG is evaporated through the heat exchange unit 120 by adjusting the flow rate control valve 140 according to the liquefaction temperature characteristic of LPG, which has a property of being liquefied at about -42.1°C or less, and adjusting the flow rate of LNG heat-exchanged with the LPG evaporation gas It can allow the gas to liquefy under optimal conditions.

열교환부(120)를 거쳐 액화된 LPG 증발가스는 제1공급라인(L1)을 통해 제1저장탱크(101)로 회수되며, 해당 LPG 증발가스와 열교환되어 기체성분으로 변환된 LNG는 제2공급라인(L2)을 통해 감압밸브(160)로 공급되어 감압된다.The LPG boil-off gas liquefied through the heat exchange unit 120 is recovered to the first storage tank 101 through the first supply line (L1), and the LNG converted into gaseous components by heat exchange with the LPG boil-off gas is supplied to the second. It is supplied to the pressure reducing valve 160 through the line L2 to reduce pressure.

한편, 제2저장탱크(102)로부터 공급되는 LNG 증발가스는 제3공급라인(L3)을 통해 공급된다. 이때, 제3공급라인(L3)에 마련된 제2액분리기(103)는 LNG 증발가스에 함유된 액체성분을 제거하여 LNG압축기(170)로 보낸다.Meanwhile, the LNG boil-off gas supplied from the second storage tank 102 is supplied through the third supply line L3. At this time, the second liquid separator 103 provided in the third supply line L3 removes the liquid component contained in the LNG boil-off gas and sends it to the LNG compressor 170.

LNG압축기(170)는 상술한 액체성분이 제거된 제2저장탱크(102)로부터 공급된 LNG 증발가스를 압축시키고, 이를 재액화부(180)로 공급한다. 이때, 상술한 감압밸브(160)에 의해 감압된 LNG 기체성분은 제2공급라인(L2)을 통해 제3공급라인(L3)의 LNG압축기(170) 후단으로 합류되어, LNG압축기(170)에 의해 압축된 LNG 증발가스와 혼합된다.The LNG compressor 170 compresses the LNG boil-off gas supplied from the second storage tank 102 from which the liquid component has been removed, and supplies it to the reliquefaction unit 180. At this time, the LNG gas component depressurized by the above-described pressure reducing valve 160 is joined to the rear end of the LNG compressor 170 of the third supply line L3 through the second supply line L2, and is then added to the LNG compressor 170. It is mixed with the compressed LNG boil-off gas.

제2저장탱크(102)로부터 공급된 LNG는 제2공급라인(L2)으로부터 분기된 제4공급라인(L4)을 통해 재액화부(180)로 공급된다. The LNG supplied from the second storage tank 102 is supplied to the reliquefaction unit 180 through a fourth supply line L4 branched from the second supply line L2.

재액화부(180)는 상술한 혼합물과 제2저장탱크(102)로부터 공급된 LNG 간 열교환을 수행하여, 해당 혼합물을 액화시킨 후, 제4공급라인(L4)에 마련된 고압펌프(190) 쪽으로 보낸다.The reliquefaction unit 180 performs heat exchange between the above-described mixture and the LNG supplied from the second storage tank 102, liquefies the mixture, and sends it to the high-pressure pump 190 provided in the fourth supply line L4. .

고압펌프(190)는 재액화부(180)에 의해 액화된 혼합물을 가압하고, 제4공급라인(L4)에 마련된 해수식기화기(195)로 보낸다.The high pressure pump 190 pressurizes the liquefied mixture by the reliquefaction unit 180 and sends it to the seawater vaporizer 195 provided in the fourth supply line L4.

해수식기화기(195)는 고압펌프(190)에 의해 가압된 혼합물을 해수와의 열교환에 의해 기화시켜 수요처(108)로 공급한다.The seawater vaporizer 195 vaporizes the mixture pressurized by the high pressure pump 190 through heat exchange with seawater and supplies it to the customer 108.

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

101: 제1저장탱크 102: 제2저장탱크
110: LPG압축기 120: 열교환부
130: 온도센서 140: 유량조절밸브
150: 제어부 160: 감압밸브
170: LNG압축기 180: 재액화부
190: 고압펌프 195: 해수식기화기
L1: 제1공급라인 L2: 제2공급라인
L3: 제3공급라인 L4: 제4공급라인101: first storage tank 102: second storage tank
110: LPG compressor 120: heat exchange part
130: temperature sensor 140: flow control valve
150: control unit 160: pressure reducing valve
170: LNG compressor 180: reliquefaction unit
190: high pressure pump 195: seawater carburetor
L1: 1st supply line L2: 2nd supply line
L3: 3rd supply line L4: 4th supply line

Claims (2)

LPG를 저장하는 제1저장탱크로부터 공급받은 LPG 증발가스를 압축시키는 LPG압축기;
상기 압축된 LPG 증발가스와 LNG를 저장하는 제2저장탱크로부터 공급받은 LNG 간 열교환을 수행하여, 상기 LPG 증발가스를 액화시키는 열교환부;
상기 열교환부에 의해 액화된 LPG 증발가스의 온도를 측정하는 온도센서;
LPG 증발가스와의 열교환을 위해 상기 열교환부로 공급되는 LNG의 유량을 조절하는 유량조절밸브; 및
상기 측정된 LPG 증발가스의 온도를 기초로 상기 유량조절밸브에 의해 상기 LPG 증발가스와 열교환되는 LNG의 유량을 조절하여, 상기 열교환부를 통해 상기 LPG 증발가스가 최적의 조건에서 액화되도록 하는 제어부;를 포함하되,
상기 열교환부에 의해 열교환된 LNG는 기체성분으로 변환되고,
상기 변환된 기체성분을 감압시키는 감압밸브와,
상기 제2저장탱크로부터 공급된 LNG 증발가스를 압축시키는 LNG압축기와,
상기 감압된 기체성분과 상기 압축된 LNG 증발가스가 혼합된 혼합물과 상기 제2저장탱크로부터 공급된 LNG 간 열교환을 수행하여, 상기 혼합물을 액화시키는 재액화부와,
상기 액화된 혼합물을 가압하는 고압펌프와,
상기 가압된 혼합물을 해수와의 열교환에 의해 기화시켜 수요처로 공급하는 해수식기화기가 마련된 LPG 증발가스의 재액화 시스템.An LPG compressor for compressing the LPG boil-off gas supplied from the first storage tank for storing LPG;
A heat exchange unit for liquefying the LPG boil-off gas by performing heat exchange between the compressed LPG boil-off gas and the LNG supplied from the second storage tank for storing the LNG;
A temperature sensor measuring the temperature of the LPG boil-off gas liquefied by the heat exchanger;
A flow control valve for controlling a flow rate of LNG supplied to the heat exchange unit for heat exchange with the LPG boil-off gas; And
A control unit for controlling the flow rate of LNG to be heat-exchanged with the LPG boil-off gas by the flow control valve based on the measured temperature of the LPG boil-off gas, so that the LPG boil-off gas is liquefied in an optimum condition through the heat exchange unit; Include,
LNG heat-exchanged by the heat exchanger is converted into gaseous components,
A pressure reducing valve for depressurizing the converted gas component,
An LNG compressor for compressing the LNG boil-off gas supplied from the second storage tank,
A reliquefaction unit for liquefying the mixture by performing heat exchange between the mixture of the depressurized gas component and the compressed LNG boil-off gas and the LNG supplied from the second storage tank;
A high-pressure pump for pressurizing the liquefied mixture,
A reliquefaction system of LPG boil-off gas provided with a seawater vaporizer that vaporizes the pressurized mixture by heat exchange with seawater and supplies it to a customer. 삭제delete
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KR101335610B1 (en) 2011-07-29 2013-12-02 대우조선해양 주식회사 Reliquefaction apparatus of liquified gas fuel using fuel LNG and liquefied gas carrier having the same

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