KR102062100B1 - Fuel gas reliquefaction system - Google Patents

Fuel gas reliquefaction system Download PDF

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KR102062100B1
KR102062100B1 KR1020180038931A KR20180038931A KR102062100B1 KR 102062100 B1 KR102062100 B1 KR 102062100B1 KR 1020180038931 A KR1020180038931 A KR 1020180038931A KR 20180038931 A KR20180038931 A KR 20180038931A KR 102062100 B1 KR102062100 B1 KR 102062100B1
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bog
line
storage tank
fuel
heat exchanger
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KR1020180038931A
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Korean (ko)
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KR20190115794A (en
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윤상득
김세정
이용희
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주식회사 동화엔텍
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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
    • 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"
    • F25J1/0035—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 gas expansion 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
    • F25J1/0032—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"
    • F25J1/0035—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 gas expansion with extraction of work
    • F25J1/0037—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 gas expansion with extraction of work of a return 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
    • F25J1/003—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
    • F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
    • F25J1/008—Hydrocarbons
    • F25J1/0082—Methane
    • 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
    • F25J1/0201—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 only internal refrigeration means, i.e. without external refrigeration
    • F25J1/0202—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 only internal refrigeration means, i.e. without external refrigeration in a quasi-closed internal refrigeration loop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
    • F25J1/0229—Integration with a unit for using hydrocarbons, e.g. consuming hydrocarbons as feed stock
    • F25J1/023—Integration with a unit for using hydrocarbons, e.g. consuming hydrocarbons as feed stock for the combustion as fuels, i.e. integration with the fuel gas system
    • 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
    • F25J1/0264—Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
    • F25J1/0275—Construction and layout of liquefaction equipments, e.g. valves, machines adapted for special use of the liquefaction unit, e.g. portable or transportable devices
    • F25J1/0277—Offshore use, e.g. during shipping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
    • F25J1/0281—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc. characterised by the type of prime driver, e.g. hot gas expander
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
    • F25J1/0285—Combination of different types of drivers mechanically coupled to the same refrigerant compressor, possibly split on multiple compressor casings
    • F25J1/0288—Combination of different types of drivers mechanically coupled to the same refrigerant compressor, possibly split on multiple compressor casings using work extraction by mechanical coupling of compression and expansion of the refrigerant, so-called companders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
    • F25J1/0294—Multiple compressor casings/strings in parallel, e.g. split arrangement
    • 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
    • F25J2210/90—Boil-off gas from storage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2215/00—Processes characterised by the type or other details of the product stream
    • F25J2215/04—Recovery of liquid products
    • 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
    • F25J2290/34—Details about subcooling of liquids

Abstract

본 발명은 LNG가 저장된 저장탱크에서 발생하는 BOG(Boil-Off Gas)를 압축 및 냉각시켜 재액화 처리하는 연료가스 재액화 시스템에 있어서, 상기 저장탱크와 연결되고 상기 저장탱크에서 발생된 BOG를 소비처로 공급되게 하는 연료라인; 상기 연료라인에 설치되는 열교환기; 상기 연료라인에 설치되고 상기 열교환기 후측에 위치하며, 단열팽창시키는 익스팬더(expander)와, 상기 익스팬더에서 냉매의 팽창력을 이용하여 상기 BOG를 압축하는 BOG 컴프레서(compressor)를 포함하는 컴팬더(compander); 상기 연료라인에 설치되고 상기 컴팬더 후측에 위치하며 상기 BOG를 냉각 및 압축하는 연료가스컴프레서세트; 상기 연료라인에서 분기되어 상기 열교환기를 거쳐 상기 저장탱크로 재공급되는 회수라인; 상기 회수라인에 설치되어 상기 연료라인에서 공급된 BOG를 압축 및 냉각하여 상기 열교환기에 공급하는 BOG 부스터 컴프레서세트; 상기 회수라인의 단부에 분기되며 상기 열교환기를 거친 후 상기 익스팬더를 거쳐 과냉되고 상기 연료라인에 연결되어 공급되게 하는 냉각라인; 및 상기 연료라인과 상기 회수라인 사이에 설치되어 상기 저장탱크에서 공급되는 BOG를 상기 저장탱크로 회수되는 BOG와 열교환하여 냉각되게 하는 BOG 프리쿨러;가 포함되는 것을 특징으로 한다.The present invention relates to a fuel gas reliquefaction system that compresses and cools BOG (Boil-Off Gas) generated in a storage tank in which LNG is stored, and reliquefies the fuel gas, wherein the BOG connected to the storage tank is consumed. A fuel line to be supplied to the furnace; A heat exchanger installed in the fuel line; A compressor installed in the fuel line and positioned at a rear side of the heat exchanger, including an expander for adiabatic expansion and a BOG compressor for compressing the BOG using the expansion force of the refrigerant in the expander. ; A fuel gas compressor set installed in the fuel line and positioned at a rear side of the compander and cooling and compressing the BOG; A recovery line branched from the fuel line and resupplied to the storage tank via the heat exchanger; A BOG booster compressor set installed in the recovery line to compress and cool the BOG supplied from the fuel line and supply the BOG to the heat exchanger; A cooling line branched at an end of the recovery line and passing through the heat exchanger to be supercooled through the expander and connected to the fuel line; And a BOG precooler installed between the fuel line and the recovery line to heat-exchange the BOG supplied from the storage tank with the BOG recovered from the storage tank.

Description

연료가스 재액화 시스템{Fuel gas reliquefaction system}Fuel gas reliquefaction system

본 발명은 연료가스 재액화 시스템에 관한 것으로, 더욱 상세하게는 LNG를 저장하는 저장탱크에서 발생한 BOG 중 연료가스 공급 외에 잉여 BOG를 냉각하고 재액화하는 연료가스 재액화 시스템에 관한 기술이다.The present invention relates to a fuel gas reliquefaction system, and more particularly, to a fuel gas reliquefaction system for cooling and reliquefying a surplus BOG in addition to a fuel gas supply among BOGs generated in a storage tank for storing LNG.

연료가스는 주성분을 메탄(Mehtane)으로 하고 있으며, 무색무취에 공기보다 가볍고 아주 낮은 온도에서 액화가 되는 특징이 있다. 대표적으로 LNG(Liquefied Natural Gas), LPG(Liquefied Petroleum Gas) 등의 액화가스로 -162℃ 온도로 냉각되어 기체일 때보다 1/600 정도의 축소된 부피로 사용된다.Fuel gas is composed of methane (Mehtane) as a main component, and it is colorless and odorless, lighter than air, and liquefied at a very low temperature. Typically, liquefied gases such as LNG (Liquefied Natural Gas) and LPG (Liquefied Petroleum Gas) are cooled to -162 ° C and used at a reduced volume of about 1/600.

이러한 연료가스는 액체상태로 저장하기 위해 저장탱크 내부에 보호하게 되나, 저장탱크 내에는 하부에 액화된 액화가스가 존재하지만 상부에는 자연 기화되면서 증발가스(BOG, Boil-Off Gas)가 존재하게 된다. 이러한 증발가스는 선박에서는 저압인 가스이며 제너럴 엔진용이나 보일러 저압연료에 공급하여 사용한다. 그리고 고압인 액화가스를 고압연료 소비처인 전자제어식 가스분사인 MEGI 엔진 즉 고압연료 소비처로 활용하게 되는데, 저압가스인 BOG는 상시 발생하고, 또한 BOG 사용하고 외에 잉여의 저압가스를 재액화하기 위해 액화상태로 지속시켜야 한다.The fuel gas is protected inside the storage tank to be stored in a liquid state, but there is liquefied liquefied gas in the lower portion of the storage tank, but boil-off gas (BOG) exists as it is naturally vaporized in the upper portion. . This boil-off gas is a low pressure gas in ships, and is supplied to general engines or low pressure boilers. The high pressure liquefied gas is used as MEGI engine, which is an electronically controlled gas injection source for high pressure fuel consumption, that is, high pressure fuel consumption source. BOG, which is a low pressure gas, is always generated. It must be kept in a state.

종래에는 별도의 루프와 BOG 프리쿨러를 가지며, 전체적인 시스템이 클로즈 루프(Loop)인점이 특징이며, 이러한 별도의 루프를 가지고 전체적인 시스템이 클로즈 루프인 경우에는 압력을 별도로 제어해야 하는 등의 시스템이 복잡해 지는 문제점이 있다.Conventionally, the system has a separate loop and a BOG precooler, and the entire system is a closed loop. In the case where the entire system is a closed loop, the system is complicated, such as a separate pressure control. There is a problem losing.

KRKR 10-174228410-1742284 B1B1

본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로, LNG를 저장하는 저장탱크에서 발생한 BOG 중 연료가스 공급이외 잉여 BOG를 재액화 하고 저장탱크에서 발생한 BOG를 냉매 루프로 이용하고 전체적인 오픈 루프(Loop) 시스템으로 운영할 수 있는 연료가스 재액화 시스템을 제공하고자 하는데 그 목적이 있다.The present invention has been made to solve the above problems, liquefying the excess BOG other than the fuel gas supply of the BOG generated in the storage tank for storing LNG and using the BOG generated in the storage tank as a refrigerant loop and the overall open loop ( The aim is to provide a fuel gas reliquefaction system that can be operated as a loop system.

상기와 같은 목적을 달성하기 위하여 본 발명은, LNG가 저장된 저장탱크에서 발생하는 BOG(Boil-Off Gas)를 압축 및 냉각시켜 재액화 처리하는 연료가스 재액화 시스템에 있어서, 상기 저장탱크와 연결되고 상기 저장탱크에서 발생된 BOG를 소비처로 공급되게 하는 연료라인; 상기 연료라인에 설치되는 열교환기; 상기 연료라인에 설치되고 상기 열교환기 후측에 위치하며, 단열팽창시키는 익스팬더(expander)와, 상기 익스팬더에서 냉매의 팽창력을 이용하여 상기 BOG를 압축하는 BOG 컴프레서(compressor)를 포함하는 컴팬더(compander); 상기 연료라인에 설치되고 상기 컴팬더 후측에 위치하며 상기 BOG를 냉각 및 압축하는 연료가스컴프레서세트; 상기 연료라인에서 분기되어 상기 열교환기를 거쳐 상기 저장탱크로 재공급되는 회수라인; 상기 회수라인에 설치되어 상기 연료라인에서 공급된 BOG를 압축 및 냉각하여 상기 열교환기에 공급하는 BOG 부스터 컴프레서세트; 상기 회수라인의 단부에 분기되며 상기 열교환기를 거친 후 상기 익스팬더를 거쳐 과냉되고 상기 연료라인에 연결되어 공급되게 하는 냉각라인; 및 상기 연료라인과 상기 회수라인 사이에 설치되어 상기 저장탱크에서 공급되는 BOG를 상기 저장탱크로 회수되는 BOG와 열교환하여 냉각되게 하는 BOG 프리쿨러;가 포함되며, 상기 연료라인에는 상기 BOG 프리쿨러 이전에 바이패스되어 상기 소비처로 바로 공급가능한 바이패스라인이 더 구비되고, 상기 회수라인에는 상기 열교환기와 상기 저장탱크 사이에 세퍼레이터가 설치되어 기체와 액체를 분리하며, 상기 BOG 부스터 컴프레셔를 통해 가압된 BOG는, 연료라인의 주 냉매와의 열교환을 통해 재액화되며, 저장탱크로 회수할 수 있는 압력으로 감압되고, 상기 감압 과정에서 발생한 세퍼레이터의 기체인 플래쉬 가스는 냉열을 지니고 있기 때문에 연료라인과 합지되어 냉각라인에 재공급되며, 상기 회수라인에서 재액화된 BOG는 냉열을 보유하고 있어 냉열과 BOG 프리쿨러를 활용하여 상기 저장탱크에서 발생된 BOG를 예냉시킴으로써 시스템의 효율과 안정성을 확보할 수 있게 되는 것을 특징으로 한다.In order to achieve the above object, the present invention, in the fuel gas reliquefaction system for compressing and cooling the BOG (Boil-Off Gas) generated in the storage tank in which LNG is stored reliquefaction, it is connected to the storage tank A fuel line configured to supply BOG generated in the storage tank to a consumer; A heat exchanger installed in the fuel line; A expander installed in the fuel line and positioned at a rear side of the heat exchanger, including an expander for adiabatic expansion and a BOG compressor for compressing the BOG using the expansion force of the refrigerant in the expander. ; A fuel gas compressor set installed in the fuel line and positioned at a rear side of the compander and cooling and compressing the BOG; A recovery line branched from the fuel line and resupplied to the storage tank via the heat exchanger; A BOG booster compressor set installed in the recovery line to compress and cool the BOG supplied from the fuel line and supply the BOG to the heat exchanger; A cooling line branched at an end of the recovery line and passing through the heat exchanger to be supercooled through the expander and connected to the fuel line; And a BOG precooler installed between the fuel line and the recovery line to heat and exchange the BOG supplied from the storage tank with the BOG recovered from the storage tank. The BOG precooler is transferred to the fuel line. Bypass is further provided with a bypass line that can be supplied directly to the consumer, the recovery line is installed in the recovery line between the heat exchanger and the storage tank to separate gas and liquid, BOG pressurized through the BOG booster compressor The liquid is re-liquefied through heat exchange with the main refrigerant of the fuel line, and the pressure is reduced to a pressure recoverable to the storage tank. Re-supplied to the cooling line, BOG liquefied in the recovery line has a cold heat, so And by using the BOG precooler to pre-cool the BOG generated in the storage tank characterized in that it is possible to ensure the efficiency and stability of the system.

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상기와 같은 구성의 본 발명에 따르면, 다음과 같은 효과를 기대할 수 있을 것이다.According to the present invention of the configuration described above, the following effects can be expected.

연료가스 BOG를 통하여 순환시키고 BOG로 냉매 루프(Loop)를 사용하므로 동일한 유체를 이용하여 냉각되게 하므로 별도의 냉매를 사용하는 시스템이 필요 없다.Since it circulates through the fuel gas BOG and uses a refrigerant loop as the BOG, it is cooled using the same fluid so that a system using a separate refrigerant is not necessary.

또한, 저장탱크 압력으로 BOG를 재액화할 수 있으므로, 재액화하기 위한 별도의 압력제어가 필요 없으므로 시스템 운전이 용이하다.In addition, since the BOG can be liquefied by the storage tank pressure, a separate pressure control for reliquefaction is not required, so the system operation is easy.

BOG 부스터 컴프레서 세트가 설치됨으로써 BOG 회수시 열교환기에 공급할 수 있어 열교환기를 소형화할 수 있다.The BOG booster compressor set can be installed to supply the heat exchanger with BOG recovery, miniaturizing the heat exchanger.

BOG 프리쿨러가 설치됨으로써 저장탱크에서 발생되어 공급되는 BOG를 예냉시킬 수 있다.By installing the BOG precooler, it is possible to precool the BOG generated and supplied from the storage tank.

도 1은 본 발명의 실시예에 따른 연료가스 재액화 시스템의 흐름도이다.1 is a flowchart of a fuel gas reliquefaction system according to an embodiment of the present invention.

본 발명의 실시예를 첨부한 도면을 참조하여 설명하면 다음과 같다.An embodiment of the present invention will be described with reference to the accompanying drawings.

도 1은 본 발명의 실시예에 따른 연료가스 재액화 시스템의 흐름도이다.1 is a flowchart of a fuel gas reliquefaction system according to an embodiment of the present invention.

도 1을 참조하면, LNG가 저장된 저장탱크에서 발생하는 BOG(Boil-Off Gas)를 압축 및 냉각시켜 재액화 처리하는 연료가스 재액화 시스템에 있어서, 본원발명은 연료라인(100), 열교환기(200), 컴팬더(300), 연료가스컴프레서세트(400), 회수라인(500), BOG 부스터 컴프레서세트(600) 냉각라인(700) 및 BOG 프리쿨러(800)가 포함되어 이루어지며, 저장탱크(T)에서 발생한 BOG를 단일유체로 하여 오픈루프(Open Loop) 시스템으로 냉각할 수 있으며, 상기 저장탱크(T)에서 발생한 BOG를 예냉 가능하게 하여 시스템의 효율과 안정성을 확보할 수 있다.Referring to FIG. 1, in the fuel gas reliquefaction system for compressing and cooling BOG (Boil-Off Gas) generated in a storage tank in which LNG is stored and reliquefaction, the present invention relates to a fuel line 100 and a heat exchanger ( 200), the compressor 300, the fuel gas compressor set 400, the recovery line 500, BOG booster compressor set 600, the cooling line 700 and the BOG precooler 800 is included, and the storage tank The BOG generated in the (T) as a single fluid can be cooled by an open loop system, and the BOG generated in the storage tank (T) can be precooled to ensure efficiency and stability of the system.

상기 연료라인(100)은 상기 저장탱크(T)와 연결되고 상기 저장탱크(T)에서 발생된 BOG를 소비처(S)로 공급되게 하는 라인이다. 도면에서는 1,2,3,4,5,6번 라인으로 흐르게 된다.The fuel line 100 is connected to the storage tank (T) and is a line for supplying the BOG generated in the storage tank (T) to the consumer (S). In the figure flows to the lines 1,2,3,4,5,6.

상기 열교환기(200)는 상기 연료라인(100)에 설치되어 열교환할 수 있는 기기이다. 상기 열교환기(200)에는 연료라인(100), 회수라인(500) 및 냉각라인(700)이 모두 통과되게 된다. 여기서 열교환기(200)는 열교환에 의해 특히 A,B,C,D,E로 이어지는 상기의 회수라인(500)을 냉각하고, R1,R2,R3로 이어지는 냉각라인(700)을 프리쿨링하게 되며, 상기 열교환기(200)의 주 냉매로는 연료라인(100)에서 합지되는 컴팬더(300)의 익스팬더(320)를 통과한 유체를 사용한다.The heat exchanger 200 is a device that is installed in the fuel line 100 to heat exchange. The fuel line 100, the recovery line 500, and the cooling line 700 pass through the heat exchanger 200. Here, the heat exchanger 200 cools the recovery line 500 leading to A, B, C, D, and E by heat exchange, and precools the cooling line 700 leading to R1, R2, and R3. As the main refrigerant of the heat exchanger 200, the fluid that has passed through the expander 320 of the compander 300 that is laminated in the fuel line 100 is used.

상기 컴팬더(compander, 300)는 상기 연료라인(100)에 설치되고 상기 열교환기(200) 후측에 위치하며, 단열팽창시키는 익스팬더(expander, 320)와, 상기 익스팬더(320)에서 냉매의 팽창력을 이용한 BOG 컴프레서(compressor, 340)로 구성된다.The compander 300 is installed in the fuel line 100 and is located at the rear side of the heat exchanger 200, and expands the expander of the refrigerant in the expander 320. It consists of the used BOG compressor (340).

상기 연료가스컴프레서세트(400)는 상기 연료라인(100)에 설치되고 상기 컴팬더(300) 후측에 위치하며, 상기 BOG 컴프레서(340)를 통과한 유체를 냉각 및 압축하는 부분으로 냉각기(420), 컴프레서(440)가 순차적으로 연결된다.The fuel gas compressor set 400 is installed in the fuel line 100 and positioned at the rear side of the compander 300, and is a cooler 420 that cools and compresses the fluid passing through the BOG compressor 340. Compressors 440 are sequentially connected.

상기 회수라인(500)은 상기 연료라인(100)에서 분기되어 상기 열교환기(200)를 거쳐 상기 저장탱크(T)로 재공급되게 하는 라인이다 도면에서는 유체가 6번에서 분기되어 A,B,C,D,E로 이동하여 저장탱크(T)로 이동하게 된다. The recovery line 500 is a line branched from the fuel line 100 to be resupplied to the storage tank T through the heat exchanger 200. In the drawing, the fluid is branched at 6 to A, B, Move to C, D, E to the storage tank (T).

상기 BOG 부스터 컴프레서세트(600)는 상기 회수라인(500)에 설치되어 상기 BOG를 압축 및 냉각하여 압축된 에너지를 활용하기 위해 상기 열교환기(200)에 공급하게 된다. 여기서 가압된 BOG는 연료라인(100) 3번의 주 냉매와의 열교환을 통해 100% 재액화되며, 저장탱크(T)로 회수할 수 있는 압력으로 감압된다. 이때 감압과정에서 발생한 세퍼레이터(900)의 기체인 플래쉬 가스(flash gas)는 충분한 냉열을 지니고 있기 때문에 F에서 연료라인(100)과 합지되어 냉각라인(700)에 재공급된다.The BOG booster compressor set 600 is installed in the recovery line 500 to compress and cool the BOG to supply the heat exchanger 200 to utilize the compressed energy. The pressurized BOG is 100% re-liquefied through heat exchange with the main refrigerant of the fuel line 100 three times, and reduced to a pressure that can be recovered to the storage tank (T). At this time, since the flash gas, which is a gas of the separator 900 generated during the decompression process, has sufficient cooling heat, it is laminated with the fuel line 100 at F and supplied to the cooling line 700 again.

상기 냉각라인(700)은 상기 회수라인(500)의 단부에 분기되며 상기 열교환기(200)를 거친 후 상기 익스팬더(320)를 거쳐 과냉되고 상기 연료라인(100)에 연결되어 공급되게 하는 라인이다. 도면에서는 R1,R2,R3 라인으로 이동하여 연료라인(100)의 3번으로 합류되게 된다.The cooling line 700 branches to an end of the recovery line 500 and passes through the heat exchanger 200 and then is supercooled through the expander 320 and connected to the fuel line 100. . In the drawing, it moves to the R1, R2, and R3 lines to join the third of the fuel lines 100.

여기서, 냉각라인(700)은 R1에서 R2로 진행시 익스팬더(320)의 부하를 줄이기 위해서 열교환기(200)에 의해 프리쿨링되어 단열팽창시키는 익스팬더(320)로 유입되고 그에 따라 충분한 냉열을 확보하게 된다. 그래서 R3로 진행되어 연료라인(100)의 3번 라인에 합류되어 재액화 시킨다.Here, the cooling line 700 is pre-cooled by the heat exchanger 200 in order to reduce the load of the expander 320 when proceeding from R1 to R2 flows into the expander 320 for adiabatic expansion, thereby ensuring sufficient cooling heat. do. Therefore, the process proceeds to R3 and joins line 3 of the fuel line 100 to reliquefy.

상기 BOG 프리쿨러(800)는 상기 연료라인(100)과 상기 회수라인(500) 사이에 설치되어 상기 저장탱크(T)에서 공급되는 BOG를 상기 저장탱크로 회수되어 재액화된 BOG와 열교환하여 냉각되게 한다.The BOG precooler 800 is installed between the fuel line 100 and the recovery line 500 and cooled by heat-exchanging the BOG supplied from the storage tank T with the BOG recovered from the storage tank. To be.

여기서, 회수라인(500)에서 재액화된 BOG는 충분한 냉열을 보유하고 있어, 이 냉열과 BOG 프리쿨러(800)를 활용하여 상기 저장탱크(T)에서 발생된 BOG를 예냉시킴으로써 시스템의 효율과 안정성을 확보할 수 있다.Here, the BOG liquefied in the recovery line 500 has a sufficient cold heat, utilizing the cold heat and the BOG precooler 800 to pre-cool the BOG generated in the storage tank (T) efficiency and stability Can be secured.

상기 연료라인(100)에는 상기 BOG 프리쿨러(800) 이전에 바이패스되어 상기 소비처(S)로 바로 공급가능한 바이패스라인(1000)이 더 구비되게 된다. 도면에서는 바이패스라인이 1에서 바로 6을 거쳐 소비처(S)로 공급되게 된다. 즉, 상기 바이패스라인(1000)은 상기 저장탱크(T)에서 발생한 BOG가 재액화 과정을 거치지 않고 소비처로 공급가능하게 하며 바이패스라인(1000)에는 BOG프리히터(1100)가 설치되어 바이패스라인(1000)으로 흐르는 BOG를 가열하여 공급할 수 있다.The fuel line 100 is further provided with a bypass line 1000 which is bypassed before the BOG precooler 800 and directly supplied to the consumer S. In the drawing, the bypass line is supplied to the consumer S through 1 to 6 directly. That is, the bypass line 1000 enables the BOG generated in the storage tank T to be supplied to the consumer without undergoing a reliquefaction process, and the bypass line 1000 has a BOG preheater 1100 installed thereon to bypass the BOG. BOG flowing through the line 1000 may be heated to be supplied.

여기서, 바이패스라인(1000)은 BOG 발생량이 많지 않은 경우 재액화할 필요가 없으므로 소비처(S)로 바로 공급하여 사용할 때 사용된다.Here, since the bypass line 1000 does not need to be liquefied when the amount of BOG generation is not large, the bypass line 1000 is used when directly supplied to the consumer S.

상기 회수라인(500)에는 상기 열교환기(200)와 상기 저장탱크(T) 사이에 세퍼레이터(900)가 설치되어 기체와 액체를 분리하여 기체인 BOG는 상기 연료라인으로 공급되게 하고, 액체인 액화가스는 D로 이동하여 저장탱크(T)로 공급되는 것을 특징으로 한다.In the recovery line 500, a separator 900 is installed between the heat exchanger 200 and the storage tank T to separate gas and liquid so that BOG, which is a gas, is supplied to the fuel line, and liquid is liquefied. The gas moves to D and is supplied to the storage tank (T).

이하에서는 본 발명인 연료가스 재액화 시스템의 유체 흐름을 순차적으로 설명하기로 한다.Hereinafter, the fluid flow of the fuel gas reliquefaction system of the present invention will be described sequentially.

먼저 연료라인(100)은 저장탱크(T)에서 발생된 BOG는 1번에서 약 -110℃가 되며 BOG 프리쿨러(800)에 의해 2번에서는 약 -150℃로 떨어지고 익스팬더(320)를 통한 BOG와 합지되어 열교환기(200)를 통과하여 주 냉매로 활용할 수 있다. 그리고 열교환기(200) 통과 후 4번에서는 약 30℃로 떨어지게 된다. 그리고 컴팬더(300)의 BOG 컴프레서(340)를 통과하고 77℃로 높아지며 연료가스컴프레서세트(400)를 통해 냉각되고 압축되어 온도는 약 40℃가 되며, 1bar에서 약 24bar까지 압축되게 되어 소비처(S)로 공급되게 된다.First, the fuel line 100 is BOG generated in the storage tank (T) is about -110 ℃ at No. 1 and drops to about -150 ℃ in No. 2 by the BOG precooler 800 and BOG through the expander 320 It is laminated with the heat exchanger 200 can be utilized as the main refrigerant. Then, after passing through the heat exchanger 200, the number 4 drops to about 30 ° C. After passing through the BOG compressor 340 of the compander 300, the temperature rises to 77 ° C., and is cooled and compressed through the fuel gas compressor set 400. The temperature is about 40 ° C., which is compressed from 1 bar to about 24 bar. S) will be supplied.

연료라인(100)의 단부에서는 분기되어 회수라인(500)과 냉각라인(700)으로 분기되어 연료가스 사용 외 잉여의 BOG를 재액화 할 수 있다.Branched at the end of the fuel line 100 may be branched to the recovery line 500 and the cooling line 700 to reliquefy the excess BOG other than the use of fuel gas.

회수라인(500)에서는 회수 BOG가 A라인에서 약 40℃, 21bar 에서 BOG 부스터 컴프레서(620)와 냉각기(640)를 거쳐 B라인 진입시 약 40℃에서 100bar 가까이 압력이 높아지게 되어 열교환기(200)에 공급되게 되고, 3번 라인의 BOG 온도 -158℃와 열교환에 의해 C 라인에서는 약 -145℃로 과냉되게 된다. 밸브를 통해 감압되고 세퍼레이터(900)에 의해 기체와 액체가 분리되어 액체는 저장탱크(T)로 공급되고 기체인 BOG는 연료라인(100)의 A라인에 공급되어 재액화 되게 할 수 있다.In the recovery line 500, the recovery BOG is about 40 ° C. in the A line, and the pressure increases to about 100 bar at about 40 ° C. when entering the B line through the BOG booster compressor 620 and the cooler 640 at 21 bar. It is supplied and subcooled to about -145 ° C in line C by heat exchange with BOG temperature of -158 ° C in line 3. The pressure is reduced through the valve and the gas and the liquid are separated by the separator 900 so that the liquid is supplied to the storage tank T and the BOG, which is the gas, is supplied to the A line of the fuel line 100 to be reliquefied.

그리고, 냉각라인(700)에서는 R1라인에서 40℃에 21bar 압력이 열교환기(200)를 통해 프리쿨링이 되어 -67℃ 까지 떨어지게 되고 익스팬더(320)를 통해 과냉되어 약 -160℃로 떨어지게 되어 R3 라인으로 공급되고 연료라인(100)의 3번라인으로 합류되어 BOG를 재액화할 수 있다.In addition, in the cooling line 700, 21 bar pressure at 40 ° C. in the R1 line is precooled through the heat exchanger 200 to fall down to −67 ° C., and is subcooled through the expander 320 to fall to about −160 ° C. It can be supplied to the line and joined to line 3 of the fuel line 100 to reliquefy the BOG.

따라서 본 발명은 연료가스 사용 외의 BOG를 냉각하고 동일한 유체인 BOG를 활용하여 냉매 루프(Loop)를 가지며 전체적인 오픈 루프(Loop)를 활용하여 시스템이 안정적으로 운영할 수 있다. 저장탱크의 압력으로 컨트롤이 가능하며 BOG 컴프레서 부스터에 의해 열교환기를 소형화할 수 있는 이점이 있다.Therefore, the present invention cools the BOG other than the fuel gas and utilizes the same fluid BOG to have a refrigerant loop, and the system can be stably operated by utilizing the entire open loop. It can be controlled by the pressure of the storage tank, and the BOG compressor booster has the advantage of miniaturizing the heat exchanger.

이상과 같이 본 발명은 연료가스 재액화 시스템을 제공하는 것을 기본적인 기술적인 사상으로 하고 있음을 알 수 있으며, 이와 같은 본 발명의 기본적인 사상의 범주내에서, 당업계의 통상의 지식을 가진자에게 있어서는 다른 많은 변형이 가능함은 물론이다.As described above, it can be seen that the present invention is to provide a fuel gas reliquefaction system as the basic technical idea, and within the scope of the basic idea of the present invention, to those skilled in the art Of course, many other variations are possible.

이상에서 설명한 본 발명은 상기한 실시예에 한정되지 않고, 이하의 특허청구범위에서 청구하는 본 발명의 요지를 벗어남이 없이 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자라면 누구든지 다양하게 변경하여 실시할 수 있는 범위까지 특허청구범위의 보호범위에 속하는 것으로 보아야 할 것이다.The present invention described above is not limited to the above-described embodiments, and various changes can be made by those skilled in the art without departing from the gist of the present invention as claimed in the following claims. It should be regarded as falling within the protection scope of the claims to the extent that it can be implemented.

100: 연료라인
200: 열교환기
300: 컴팬더
320: 익스팬더
340: BOG 컴프레서
400: 연료가스컴프레서세트
500: 회수라인
600: BOG 부스터 컴프레서세트
700: 냉각라인
800: BOG 프리쿨러
900: 세퍼레이터
1000: 바이패스라인100: fuel line
200: heat exchanger
300: compander
320: expander
340: BOG Compressor
400: fuel gas compressor set
500: recovery line
600: BOG Booster Compressor Set
700: cooling line
800: BOG Precooler
900: separator
1000: bypass line

Claims (3)

LNG가 저장된 저장탱크에서 발생하는 BOG(Boil-Off Gas)를 압축 및 냉각시켜 재액화 처리하는 연료가스 재액화 시스템에 있어서,
상기 저장탱크와 연결되고 상기 저장탱크에서 발생된 BOG를 소비처로 공급되게 하는 연료라인;
상기 연료라인에 설치되는 열교환기;
상기 연료라인에 설치되고 상기 열교환기 후측에 위치하며, 단열팽창시키는 익스팬더(expander)와, 상기 익스팬더에서 냉매의 팽창력을 이용하여 상기 BOG를 압축하는 BOG 컴프레서(compressor)를 포함하는 컴팬더(compander);
상기 연료라인에 설치되고 상기 컴팬더 후측에 위치하며 상기 BOG를 냉각 및 압축하는 연료가스컴프레서세트;
상기 연료라인에서 분기되어 상기 열교환기를 거쳐 상기 저장탱크로 재공급되는 회수라인;
상기 회수라인에 설치되어 상기 연료라인에서 공급된 BOG를 압축 및 냉각하여 상기 열교환기에 공급하는 BOG 부스터 컴프레서세트;
상기 회수라인의 단부에 분기되며 상기 열교환기를 거친 후 상기 익스팬더를 거쳐 과냉되고 상기 연료라인에 연결되어 공급되게 하는 냉각라인; 및
상기 연료라인과 상기 회수라인 사이에 설치되어 상기 저장탱크에서 공급되는 BOG를 상기 저장탱크로 회수되는 BOG와 열교환하여 냉각되게 하는 BOG 프리쿨러;가 포함되며,
상기 연료라인에는,
상기 BOG 프리쿨러 이전에 바이패스되어 상기 소비처로 바로 공급가능한 바이패스라인이 더 구비되고,
상기 회수라인에는,
상기 열교환기와 상기 저장탱크 사이에 세퍼레이터가 설치되어 기체와 액체를 분리하며,
상기 BOG 부스터 컴프레셔를 통해 가압된 BOG는, 연료라인의 주 냉매와의 열교환을 통해 재액화되며, 저장탱크로 회수할 수 있는 압력으로 감압되고, 상기 감압 과정에서 발생한 세퍼레이터의 기체인 플래쉬 가스는 냉열을 지니고 있기 때문에 연료라인과 합지되어 냉각라인에 재공급되며,
상기 회수라인에서 재액화된 BOG는 냉열을 보유하고 있어 냉열과 BOG 프리쿨러를 활용하여 상기 저장탱크에서 발생된 BOG를 예냉시킴으로써 시스템의 효율과 안정성을 확보할 수 있게 되는 것을 특징으로 하는 연료가스 재액화 시스템.In a fuel gas reliquefaction system that compresses and cools BOG (Boil-Off Gas) generated in a storage tank in which LNG is stored to reliquefy the process,
A fuel line connected to the storage tank and configured to supply the BOG generated in the storage tank to a consumer;
A heat exchanger installed in the fuel line;
A expander installed in the fuel line and positioned at a rear side of the heat exchanger, including an expander for adiabatic expansion and a BOG compressor for compressing the BOG using the expansion force of the refrigerant in the expander. ;
A fuel gas compressor set installed in the fuel line and positioned at a rear side of the compander and cooling and compressing the BOG;
A recovery line branched from the fuel line and resupplied to the storage tank via the heat exchanger;
A BOG booster compressor set installed in the recovery line to compress and cool the BOG supplied from the fuel line and supply the BOG to the heat exchanger;
A cooling line branched at an end of the recovery line and passing through the heat exchanger to be supercooled through the expander and connected to the fuel line; And
And a BOG precooler installed between the fuel line and the recovery line to heat and heat the BOG supplied from the storage tank with the BOG recovered from the storage tank.
In the fuel line,
It is further provided with a bypass line that is bypassed before the BOG precooler and can be supplied directly to the consumer,
The recovery line,
A separator is installed between the heat exchanger and the storage tank to separate gas and liquid.
The BOG pressurized through the BOG booster compressor is re-liquefied through heat exchange with the main refrigerant of the fuel line, and is decompressed to a pressure recoverable to the storage tank, and the flash gas, which is a gas of the separator generated in the decompression process, is cold heat. Because it has the fuel oil, it is combined with the fuel line and re-supplied to the cooling line.
The BOG re-liquefied in the recovery line has cold heat, and thus, by preheating the BOG generated in the storage tank by using the cold heat and the BOG precooler, it is possible to secure the efficiency and stability of the system. Liquefaction system. 삭제delete 삭제delete
KR1020180038931A 2018-04-04 2018-04-04 Fuel gas reliquefaction system KR102062100B1 (en)

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