KR102173909B1 - Fuel supply system - Google Patents

Fuel supply system Download PDF

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Publication number
KR102173909B1
KR102173909B1 KR1020140173548A KR20140173548A KR102173909B1 KR 102173909 B1 KR102173909 B1 KR 102173909B1 KR 1020140173548 A KR1020140173548 A KR 1020140173548A KR 20140173548 A KR20140173548 A KR 20140173548A KR 102173909 B1 KR102173909 B1 KR 102173909B1
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South Korea
Prior art keywords
nitrogen
tank
gas
fuel supply
liquefied gas
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KR1020140173548A
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Korean (ko)
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KR20160068178A (en
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조민규
문성재
유호연
전춘식
정일웅
조정관
최병윤
최성훈
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삼성중공업 주식회사
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Priority to KR1020140173548A priority Critical patent/KR102173909B1/en
Publication of KR20160068178A publication Critical patent/KR20160068178A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0221—Fuel storage reservoirs, e.g. cryogenic tanks
    • F02M21/0224—Secondary gaseous fuel 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
    • F17C6/00—Methods and apparatus for filling vessels not under pressure with liquefied or solidified gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—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
    • F25J1/007—Primary atmospheric gases, mixtures thereof
    • F25J1/0072—Nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0203—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle
    • F25J1/0204—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle as a single flow SCR cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0228—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
    • F25J1/0244—Operation; Control and regulation; Instrumentation
    • F25J1/0245—Different modes, i.e. 'runs', of operation; Process control
    • F25J1/0251—Intermittent or alternating process, so-called batch process, e.g. "peak-shaving"
    • 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.
    • F25J1/0292—Refrigerant compression by cold or cryogenic suction of the refrigerant gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0337—Heat exchange with the fluid by cooling
    • F17C2227/0341—Heat exchange with the fluid by cooling using another fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • 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
    • F17C2227/0367—Localisation of heat exchange
    • F17C2227/0369—Localisation of heat exchange in or on a vessel
    • F17C2227/0374—Localisation of heat exchange in or on a vessel in the liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • F17C2265/032—Treating the boil-off by recovery
    • F17C2265/033—Treating the boil-off by recovery with cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/06—Fluid distribution
    • F17C2265/066—Fluid distribution for feeding engines for propulsion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/08—Cold compressor, i.e. suction of the gas at cryogenic temperature and generally without afterstage-cooler
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/30—Compression of the feed stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2235/00—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
    • F25J2235/60—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams the fluid being (a mixture of) hydrocarbons
    • 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
    • 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
    • F25J2290/62—Details of storing a fluid in a tank

Abstract

연료공급시스템을 개시한다. 본 발명의 실시 예에 따른 연료공급시스템은 액화가스를 저장하는 저장탱크; 저장탱크로부터 액화가스를 공급받아 저장하는 보조탱크; 보조탱크에 저장된 액화가스를 처리하여 엔진으로 공급하는 연료공급라인; 액체질소를 저장하는 질소탱크; 저장탱크의 증발가스를 보조탱크 내부의 액화가스 및 열교환기와 열교환을 통해 액화시킨 후 저장탱크로 복귀시키는 재액화라인; 및 질소탱크의 액체질소를 열교환기 및 보조탱크 내부의 액화가스와 열교환 후에 질소탱크로 복귀시키는 질소순환라인을 포함한다.Start the fuel supply system. A fuel supply system according to an embodiment of the present invention includes a storage tank for storing liquefied gas; An auxiliary tank receiving and storing liquefied gas from the storage tank; A fuel supply line for processing the liquefied gas stored in the auxiliary tank and supplying it to the engine; A nitrogen tank for storing liquid nitrogen; A re-liquefaction line for liquefying the boil-off gas of the storage tank through heat exchange with the liquefied gas inside the auxiliary tank and a heat exchanger and then returning to the storage tank; And a nitrogen circulation line for returning liquid nitrogen in the nitrogen tank to the nitrogen tank after heat exchange with the liquefied gas inside the heat exchanger and the auxiliary tank.

Description

연료공급시스템{FUEL SUPPLY SYSTEM}Fuel supply system {FUEL SUPPLY SYSTEM}

본 발명은 저장탱크에서 발생하는 증발가스를 질소탱크의 액체질소를 이용하여 재액화할 수 있는 연료공급시스템에 관한 것이다.The present invention relates to a fuel supply system capable of reliquefying boil-off gas generated in a storage tank using liquid nitrogen in a nitrogen tank.

액화천연가스(LNG) 운반선 또는 액화가스 추진선박은 액화가스 연료 또는 액화화물을 저장하는 저장탱크에서 증발가스가 발생하기 때문에 이 증발가스를 재액화하기 위한 재액화장치를 갖추고 있다.Liquefied natural gas (LNG) carriers or liquefied gas propulsion ships are equipped with a re-liquefaction device for re-liquefying the liquefied gas because boil-off gas is generated in a storage tank that stores liquefied gas fuel or liquefied cargo.

대한민국 공개특허공보 10-2008-0104110호(2008. 12. 01. 공개)에 개시된 선박의 연료가스 공급시스템은 증발가스를 재액화시키는 재액화장치의 예를 제시한 바 있다. 이 재액화장치는 저장탱크에서 발생하는 증발가스를 압축기로 압축한 상태에서 저장탱크로부터 엔진으로 공급 중인 액화가스와 열교환시켜 액화하는 방식이다.The fuel gas supply system of a ship disclosed in Korean Laid-Open Patent Publication No. 10-2008-0104110 (published on December 01, 2008) has presented an example of a reliquefaction device for reliquefying boil-off gas. This reliquefaction device is a method of liquefying the boil-off gas generated in the storage tank by exchanging heat with the liquefied gas supplied to the engine from the storage tank in a compressed state with a compressor.

그러나 이러한 재액화장치는 연료로 공급 중인 액화가스와 열교환을 통해 증발가스의 액화를 구현하는 방식이기 때문에 액화효율을 높이는데 한계가 있었다.However, since such a reliquefaction device is a method of liquefying the boil-off gas through heat exchange with the liquefied gas supplied as fuel, there is a limit to increasing the liquefaction efficiency.

대한민국 공개특허공보 10-2008-0104110호(2008. 12. 01. 공개)Korean Patent Publication No. 10-2008-0104110 (published on December 01, 2008)

본 발명의 실시 예는 저장탱크에서 발생하는 증발가스를 액화가스와 액체질소를 이용해 액화함으로써 액화효율을 높일 수 있는 연료공급시스템을 제공하고자 한다.An embodiment of the present invention is to provide a fuel supply system capable of increasing liquefaction efficiency by liquefying the boil-off gas generated in a storage tank using liquefied gas and liquid nitrogen.

본 발명의 실시 예는 질소탱크의 질소가스를 재액화하여 이용함과 동시에 질소가스로 연료계통의 퍼징을 수행할 수 있는 연료공급시스템을 제공하고자 한다. An embodiment of the present invention is to provide a fuel supply system capable of purging a fuel system with nitrogen gas while re-liquefying nitrogen gas in a nitrogen tank.

본 발명의 일 측면에 따르면, 액화가스를 저장하는 저장탱크; 상기 저장탱크로부터 액화가스를 공급받아 저장하는 보조탱크; 상기 보조탱크에 저장된 액화가스를 처리하여 엔진으로 공급하는 연료공급라인; 액체질소를 저장하는 질소탱크; 상기 저장탱크의 증발가스를 상기 보조탱크 내부의 액화가스 및 열교환기와 열교환을 통해 액화시킨 후 상기 저장탱크로 복귀시키는 재액화라인; 및 상기 질소탱크의 액체질소를 상기 열교환기 및 상기 보조탱크 내부의 액화가스와 열교환 후에 상기 질소탱크로 복귀시키는 질소순환라인을 포함하는 연료공급시스템이 제공될 수 있다.According to an aspect of the present invention, a storage tank for storing liquefied gas; An auxiliary tank receiving and storing liquefied gas from the storage tank; A fuel supply line for processing the liquefied gas stored in the auxiliary tank and supplying it to the engine; A nitrogen tank for storing liquid nitrogen; A re-liquefaction line for liquefying the boil-off gas of the storage tank through heat exchange with the liquefied gas inside the auxiliary tank and a heat exchanger and then returning to the storage tank; And a nitrogen circulation line for returning liquid nitrogen in the nitrogen tank to the nitrogen tank after heat exchange with the heat exchanger and liquefied gas inside the auxiliary tank.

상기 재액화라인은 상기 보조탱크 내부의 액화가스에 잠긴상태로 설치되는 열교환부를 포함할 수 있다.The reliquefaction line may include a heat exchanger installed in a state immersed in the liquefied gas inside the auxiliary tank.

상기 질소순환라인은 상기 질소탱크 내부의 액체질소를 압송하는 질소펌프와, 상기 열교환기 및 상기 보조탱크를 거쳐 상기 질소탱크로 복귀하는 질소가스를 감압 팽창시키는 팽창장치를 포함할 수 있다.The nitrogen circulation line may include a nitrogen pump for pumping liquid nitrogen inside the nitrogen tank, and an expansion device for decompressing and expanding nitrogen gas returned to the nitrogen tank through the heat exchanger and the auxiliary tank.

상기 질소순환라인은 상기 보조탱크 내부의 액화가스에 잠긴상태로 설치되는 열교환부와, 상기 질소탱크 내부의 액체질소에 잠긴상태로 설치되는 스파이럴형 열교환부를 포함할 수 있다.The nitrogen circulation line may include a heat exchange unit installed in a state immersed in the liquefied gas inside the auxiliary tank, and a spiral type heat exchange unit installed in a state immersed in liquid nitrogen inside the nitrogen tank.

상기 연료공급시스템은 상기 질소탱크의 질소가스를 압축기에서 압축한 후 상기 열교환기에서 열교환시키고, 팽창장치에서 액화한 후 상기 질소탱크로 복귀시키는 질소액화라인을 더 포함할 수 있다.The fuel supply system may further include a nitrogen liquefaction line for compressing nitrogen gas in the nitrogen tank by a compressor, exchanging heat in the heat exchanger, liquefying it in an expansion device, and returning it to the nitrogen tank.

상기 연료공급시스템은 상기 질소탱크의 질소가스를 압축기에서 압축한 후 상기 보조탱크 내부의 액화가스와 열교환시키고, 팽창장치에서 액화한 후 상기 질소탱크로 복귀시키는 질소액화라인을 더 포함할 수 있다.The fuel supply system may further include a nitrogen liquefaction line for compressing the nitrogen gas of the nitrogen tank by a compressor, exchanging heat with the liquefied gas inside the auxiliary tank, liquefying it in an expansion device, and returning it to the nitrogen tank.

상기 질소액화라인은 상기 압축기에서 압축된 질소가스를 상기 연료공급라인 외측을 포위하는 겹층배관 내부를 통과시켜 상기 겹층배관의 퍼징(Purging)을 수행할 수 있다. The nitrogen liquefaction line may perform purging of the double layer pipe by passing nitrogen gas compressed by the compressor through the inside of the double layer pipe surrounding the outside of the fuel supply line.

본 발명의 실시 예에 따른 연료공급시스템은 저장탱크에서 발생하는 증발가스를 보조탱크 내부의 액화가스를 이용해 냉각시킨 후 열교환기에서 질소탱크로부터 공급된 액체질소를 이용해 액화할 수 있기 때문에 증발가스의 액화효율을 높일 수 있다. The fuel supply system according to an embodiment of the present invention cools the boil-off gas generated in the storage tank using the liquefied gas inside the auxiliary tank and then liquefies the boil-off gas using liquid nitrogen supplied from the nitrogen tank in a heat exchanger. It can increase the liquefaction efficiency.

본 발명의 실시 예에 따른 연료공급시스템은 질소탱크의 질소가스를 질소액화라인을 통해 재액화시킬 수 있기 때문에 질소의 보충이 없이도 증발가스의 연속적인 재액화를 수행할 수 있다.Since the fuel supply system according to an embodiment of the present invention can re-liquefy nitrogen gas in a nitrogen tank through a nitrogen liquefaction line, it is possible to continuously re-liquefy the boil-off gas without replenishing nitrogen.

본 발명의 실시 예에 따른 연료공급시스템은 질소가스를 액화시키는 과정에서 질소액화라인의 질소가스가 엔진 연료계통의 겹층배관을 통과하도록 하기 때문에 질소가스의 액화과정에서 연료계통 겹층배관의 퍼징을 수행할 수 있다.In the fuel supply system according to an embodiment of the present invention, the nitrogen gas of the nitrogen liquefaction line passes through the double layer pipe of the engine fuel system in the process of liquefying nitrogen gas. can do.

도 1은 본 발명의 제1실시 예에 따른 연료공급시스템을 나타낸다.
도 2는 본 발명의 제2실시 예에 따른 연료공급시스템을 나타낸다.1 shows a fuel supply system according to a first embodiment of the present invention.
2 shows a fuel supply system according to a second embodiment of the present invention.

이하에서는 본 발명의 실시 예를 첨부 도면을 참조하여 상세히 설명한다. 이하의 실시 예는 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 본 발명의 사상을 충분히 전달하기 위해 제시하는 것이다. 본 발명은 여기서 제시한 실시 예만으로 한정되지 않고 다른 형태로 구체화될 수도 있다. 도면은 본 발명을 명확히 하기 위해 설명과 관계 없는 부분의 도시를 생략하고, 이해를 돕기 위해 구성요소의 크기를 다소 과장하여 표현할 수 있다. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following examples are presented in order to sufficiently convey the spirit of the present invention to those of ordinary skill in the art to which the present invention pertains. The present invention is not limited only to the embodiments presented herein, but may be embodied in other forms. In the drawings, in order to clarify the present invention, portions not related to the description may be omitted, and sizes of components may be somewhat exaggerated to help understanding.

도 1은 본 발명의 제1실시 예에 연료공급시스템을 나타낸다. 도시한 바와 같이, 액화가스 추진선박이나 액화가스 운송선의 연료계통은 액화가스를 저장하는 저장탱크(1)와, 저장탱크(1)로부터 액화가스를 공급받아 저장하며 저장탱크(1)보다 높은 압력을 유지하는 보조탱크(2)를 구비한다.1 shows a fuel supply system according to a first embodiment of the present invention. As shown, the fuel system of a liquefied gas propulsion ship or a liquefied gas transport ship has a storage tank 1 for storing liquefied gas and a storage tank 1 to receive and store the liquefied gas, and the pressure is higher than the storage tank 1 It is provided with an auxiliary tank (2) to hold.

또 이 연료계통은 저장탱크(1)의 액화가스를 보조탱크(2)로 공급하기 위한 제1연료공급라인(10)과, 보조탱크(2)에 저장된 액화가스를 처리하여 고압가스엔진(3)으로 공급하기 위한 제2연료공급라인(20)과, 저장탱크(1)의 증발가스를 고압가스엔진(3)의 공급조건으로 압축하여 고압가스엔진(3)으로 공급하기 위한 제3연료공급라인(30), 제3연료공급라인(30)으로부터 분기되며 상대적으로 낮은 압력으로 압축된 증발가스를 저압가스엔진(4)으로 공급하기 위한 제4연료공급라인(40), 제1연료공급라인(10)으로부터 분기되며 액화가스를 처리하여 저압가스엔진(4)으로 공급하기 위한 제5연료공급라인(50), 그리고 외부로부터 저장탱크(10)로 액화가스를 공급하기 위한 벙커링라인(60)을 포함할 수 있다.In addition, this fuel system processes the first fuel supply line 10 for supplying the liquefied gas from the storage tank 1 to the auxiliary tank 2, and the liquefied gas stored in the auxiliary tank 2, thereby processing the high-pressure gas engine 3 ) To supply the second fuel supply line (20) and the third fuel supply to supply to the high pressure gas engine (3) by compressing the boil-off gas from the storage tank (1) under the supply conditions of the high pressure gas engine (3) Line 30, a fourth fuel supply line 40, a first fuel supply line for supplying boil-off gas compressed at a relatively low pressure to the low pressure gas engine 4, branched from the third fuel supply line 30 A fifth fuel supply line (50) branching from (10) and processing liquefied gas and supplying it to the low-pressure gas engine (4), and a bunkering line (60) for supplying liquefied gas to the storage tank (10) from the outside. It may include.

저장탱크(1)에 저장되는 액화가스는 액화상태로 저장할 수 있는 LNG, LPG, DME(Dimethylether), 에탄(Ethane) 중 어느 하나일 수 있으나 이에 한정되는 것은 아니다. 저장탱크(1)는 단열상태를 유지하면서 연료를 액화상태로 저장하는 탱크다. 예를 들어, 저장탱크(1)는 액화가스가 LNG일 경우 내부압력이 1bar를 유지하거나 연료공급조건을 고려해 그보다 높은 압력으로 유지할 수 있고, 액화상태 유지를 위해 내부온도가 -163도 정도를 유지할 수 있다. The liquefied gas stored in the storage tank 1 may be any one of LNG, LPG, dimethylether (DME), and ethane that can be stored in a liquefied state, but is not limited thereto. The storage tank 1 is a tank that stores fuel in a liquefied state while maintaining an adiabatic state. For example, when the liquefied gas is LNG, the storage tank 1 can maintain an internal pressure of 1 bar or a higher pressure in consideration of fuel supply conditions, and maintain an internal temperature of -163 degrees to maintain the liquefied state. I can.

저압가스엔진(4)은 대략 5 ~ 6bar의 연료가스를 공급받는 엔진 일 수 있고, 고압가스엔진(3)은 대략 300~400bar의 연료가스를 공급받는 엔진일 수 있다. 물론, 엔진들(3,4)은 다양한 방식이 채용될 수 있을 것이므로 엔진들의 형태가 이에 한정되는 것은 아니다. The low pressure gas engine 4 may be an engine receiving fuel gas of approximately 5 to 6 bar, and the high pressure gas engine 3 may be an engine receiving fuel gas of approximately 300 to 400 bar. Of course, since the engines 3 and 4 may employ various methods, the shape of the engines is not limited thereto.

제1연료공급라인(10)은 저장탱크(1) 내부로부터 보조탱크(2) 내부로 연장되어 액화가스를 공급할 수 있는 배관으로 구성될 수 있고, 저장탱크(1)의 바닥과 근접하는 제1연료공급라인(10)의 입구에는 상대적으로 압력이 높은 보조탱크(2)로 액화가스를 압송할 수 있는 펌프(11)가 설치된다.The first fuel supply line 10 may be configured as a pipe extending from the inside of the storage tank 1 to the inside of the auxiliary tank 2 to supply liquefied gas, and the first fuel supply line 10 close to the bottom of the storage tank 1 At the inlet of the fuel supply line 10, a pump 11 capable of pumping liquefied gas to the auxiliary tank 2 having a relatively high pressure is installed.

보조탱크(2)는 국제해사기구(IMO, International Maritime Organization)의 분류에 따른 압력식 C형 탱크일 수 있다. 여기서는 일 예로써 보조탱크(2)로 C형 탱크가 채용된 경우를 제시하고 있지만, 보조탱크(2)의 형태가 이에 한정되는 것은 아니다. The auxiliary tank 2 may be a pressure-type C-type tank according to the classification of the International Maritime Organization (IMO). Here, as an example, a case in which a C-type tank is employed as the auxiliary tank 2 is presented, but the shape of the auxiliary tank 2 is not limited thereto.

제2연료공급라인(20)에는 보조탱크(2)에 저장된 액화가스를 고압가스엔진(3)의 공급압력으로 압축해 송출하는 고압펌프(21)와, 고압펌프(21)로부터 송출된 고압의 액화가스를 기화하여 고압가스엔진(3) 쪽으로 보내는 고압기화기(22)가 설치된다. 고압기화기(22)로부터 고압가스엔진(3) 쪽으로 공급되는 연료가스는 고압가스엔진(3)의 공급조건(압력, 온도)에 부합하도록 조절될 수 있다. 이를 위해 도면에 나타내지는 않았지만, 고압기화기(22)와 고압가스엔진(3) 사이에는 가열 등을 통해 온도를 조절할 수 있는 수단과, 버퍼탱크나 압력조절용 밸브처럼 압력을 조절할 수 있는 수단이 마련될 수 있다.The second fuel supply line 20 includes a high-pressure pump 21 that compresses and delivers the liquefied gas stored in the auxiliary tank 2 to the supply pressure of the high-pressure gas engine 3, and a high-pressure pump delivered from the high-pressure pump 21. A high-pressure carburetor 22 is installed that vaporizes the liquefied gas and sends it to the high-pressure gas engine 3. The fuel gas supplied from the high-pressure carburetor 22 toward the high-pressure gas engine 3 may be adjusted to meet the supply conditions (pressure, temperature) of the high-pressure gas engine 3. For this purpose, although not shown in the drawings, a means for controlling the temperature through heating, etc., and a means for controlling the pressure, such as a buffer tank or a pressure regulating valve, are provided between the high-pressure carburetor 22 and the high-pressure gas engine 3 I can.

제3연료공급라인(30)에는 다단 압축기(31)가 설치된다. 따라서 저장탱크(1)에서 발생한 증발가스를 고압가스엔진(3)의 공급조건에 부압하도록 가압한 상태에서 고압가스엔진(3)으로 공급함으로써 저장탱크(1)의 증발가스를 고압가스엔진(3)의 연료로 이용할 수 있다. 도면에 나타내지는 않았지만, 제3연료공급라인(30)에도 공급되는 연료가스의 온도조절을 위한 열교환기 등이 설치될 수 있다.A multistage compressor 31 is installed in the third fuel supply line 30. Therefore, by supplying the boil-off gas generated in the storage tank 1 to the high-pressure gas engine 3 in a state where it is pressurized to negatively press the supply condition of the high-pressure gas engine 3, the boil-off gas of the storage tank 1 is supplied to the high-pressure gas engine 3 ) Can be used as fuel. Although not shown in the drawing, a heat exchanger or the like for controlling the temperature of the fuel gas supplied to the third fuel supply line 30 may be installed.

제4연료공급라인(40)은 저장탱크(1)의 증발가스를 저압가스엔진(4)의 공급압력으로 압축한 상태에서 저압가스엔진(4)으로 공급할 수 있도록 다단 압축기(31)의 중간단계에서 분기되어 저압가스엔진(4)에 연결된다. 제4연료공급라인(40)에는 저압가스엔진(4)으로 공급되는 연료가스의 온도조절을 위한 열교환기(41)가 설치될 수 있다.The fourth fuel supply line 40 is an intermediate stage of the multi-stage compressor 31 to supply the boil-off gas of the storage tank 1 to the low-pressure gas engine 4 in a compressed state at the supply pressure of the low-pressure gas engine 4. Branched from and connected to the low pressure gas engine (4). A heat exchanger 41 for controlling the temperature of the fuel gas supplied to the low pressure gas engine 4 may be installed in the fourth fuel supply line 40.

제5연료공급라인(50)은 제1연료공급라인(10)으로부터 분기되어 저압가스엔진(4)으로 연결된다. 제5연료공급라인(50)에는 제1연료공급라인(10)의 액화가스를 기화하기 위한 기화기(51)와, 기화된 연료가스를 저압가스엔진(4)의 공급조건에 부합하도록 열교환하는 열교환기(52)가 설치될 수 있다.The fifth fuel supply line 50 is branched from the first fuel supply line 10 and connected to the low pressure gas engine 4. The fifth fuel supply line 50 includes a vaporizer 51 for vaporizing the liquefied gas of the first fuel supply line 10 and a heat exchanger for exchanging the vaporized fuel gas to meet the supply conditions of the low pressure gas engine 4. The machine 52 may be installed.

이처럼 제1실시 예에 따른 액화가스 추진선박의 연료계통은 저장탱크(1)에서 발생하는 증발가스를 처리하여 고압가스엔진(3)이나 저압가스엔진(4)의 연료로 이용할 수 있다. 또 저장탱크(1)의 증발가스 양이 연료로 이용하기에 부족할 경우에는 저장탱크(1)의 액화가스를 처리하여 역시 고압가스엔진(3)이나 저압가스엔진(4)의 연료로 이용할 수 있다.As described above, the fuel system of the liquefied gas propulsion ship according to the first embodiment can be used as fuel for the high-pressure gas engine 3 or the low-pressure gas engine 4 by processing the boil-off gas generated in the storage tank 1. In addition, if the amount of boil-off gas in the storage tank 1 is insufficient to be used as fuel, the liquefied gas in the storage tank 1 can be treated and used as fuel for the high-pressure gas engine 3 or the low-pressure gas engine 4. .

벙커링라인(60)은 선박에 마련된 벙커링스테이션으로부터 저장탱크(1)까지 연장된다. 벙커링라인(60)은 저장탱크(1)와 연결되면서 제1관(61)과 제2관(62)으로 분기될 수 있다. 제1관(61)은 저장탱크(1) 내부 하측으로 연장되고, 제2관(62)은 저장탱크(1) 내측 상부에 마련되는 분사헤드(63)에 연결될 수 있다. 제2관(62) 및 분사헤드(63)를 통해 샤워방식으로 공급되는 액화가스가 저장탱크(1) 내측 상부의 증발가스를 액화시키는 효과를 발휘하여 저장탱크(1)로 연료를 공급하는 과정에서 발생하는 증발가스를 줄일 수 있다. The bunkering line 60 extends from the bunkering station provided on the ship to the storage tank 1. The bunkering line 60 may be branched into the first pipe 61 and the second pipe 62 while being connected to the storage tank 1. The first pipe 61 extends downwardly inside the storage tank 1, and the second pipe 62 may be connected to the spray head 63 provided at the upper inner side of the storage tank 1. The process of supplying fuel to the storage tank 1 by exerting the effect of liquefied gas supplied in a shower method through the second pipe 62 and the injection head 63 to liquefy the boil-off gas inside the storage tank 1 It can reduce the evaporation gas generated from

또 제1실시 예의 연료공급시스템은 저장탱크(1)에서 발생하는 증발가스의 양이 저압가스엔진(4) 및 고압가스엔진(3)의 사용량을 초과할 경우 이를 액화하여 다시 저장탱크(1)로 공급하기 위한 재액화시스템을 구비한다.In addition, in the fuel supply system of the first embodiment, when the amount of boil-off gas generated in the storage tank 1 exceeds the amount of use of the low-pressure gas engine 4 and the high-pressure gas engine 3, it is liquefied and then the storage tank 1 Equipped with a re-liquefaction system for supplying to.

재액화시스템은 액체질소를 저장하는 질소탱크(5), 질소탱크(5)의 액체질소와 저장탱크(1)의 증발가스를 열교환시켜 증발가스를 액화시키는 열교환기(6), 저장탱크(1)의 증발가스가 보조탱크(2) 내부의 액화가스 및 열교환기(6)를 거쳐 액화된 후 저장탱크(1)로 복귀할 수 있도록 하는 재액화라인(70), 질소탱크(5)의 액체질소가 열교환기(6) 및 보조탱크(2) 내부의 액화가스와 열교환 한 후 다시 질소탱크(5)로 복귀할 수 있도록 하는 질소순환라인(80)을 구비한다. 또 재액화시스템은 질소탱크(5) 내부의 질소가스를 액화한 후 다시 질소탱크(5)로 복귀시키는 질소액화라인(90)을 포함한다.The re-liquefaction system includes a nitrogen tank (5) that stores liquid nitrogen, a heat exchanger (6) and a storage tank (1) that heat-exchanges the liquid nitrogen in the nitrogen tank (5) with the boil-off gas from the storage tank (1) to liquefy the boil-off gas. ) Of the liquefied gas in the auxiliary tank (2) and the liquid in the nitrogen tank (5) to be liquefied through the heat exchanger (6) and then return to the storage tank (1) A nitrogen circulation line 80 is provided to allow nitrogen to return to the nitrogen tank 5 after heat exchange with the heat exchanger 6 and the liquefied gas inside the auxiliary tank 2. In addition, the re-liquefaction system includes a nitrogen liquefaction line 90 for liquefying the nitrogen gas inside the nitrogen tank 5 and then returning it to the nitrogen tank 5.

재액화라인(70)은 제4연료공급라인(40)으로부터 분기되어 보조탱크(2) 내부의 액화가스에 잠긴상태로 설치되는 스파이럴형 열교환부(2a) 및 열교환기(6)를 거친 후 벙커링라인(60)에 연결될 수 있다. 또 재액화라인(70)에는 저장탱크(1) 내부압력을 고려해 열교환기(6)에서 액화된 액화가스가 감압상태에서 저장탱크(1)로 공급될 수 있도록 하는 감압밸브(71)가 설치될 수 있다. The re-liquefaction line 70 branches off from the fourth fuel supply line 40 and passes through the spiral-type heat exchanger 2a and the heat exchanger 6 installed in a state immersed in the liquefied gas inside the auxiliary tank 2 and then bunkering. It can be connected to line 60. In addition, a pressure reducing valve 71 will be installed in the re-liquefaction line 70 so that the liquefied gas liquefied in the heat exchanger 6 can be supplied to the storage tank 1 in a reduced pressure state in consideration of the internal pressure of the storage tank 1. I can.

재액화라인(70)은 다단 압축기(31)에서 압축된 증발가스가 보조탱크(2)의 열교환부(2a)를 거치면서 1차 열교환하여 냉각되고, 열교환기(6)에서 2차 열교환을 하며 재 냉각되기 때문에 증발가스의 액화효율을 높일 수 있다. In the reliquefaction line 70, the boil-off gas compressed by the multi-stage compressor 31 is cooled by primary heat exchange while passing through the heat exchange part 2a of the auxiliary tank 2, and the secondary heat exchange is performed in the heat exchanger 6. Because it is re-cooled, the liquefaction efficiency of the boil-off gas can be increased.

질소순환라인(80)은 질소탱크(5) 내부로부터 연장되어 열교환기(6) 및 보조탱크(2) 내부의 액화가스에 잠긴상태로 설치되는 스파이럴형 열교환부(2b)를 거친 후 다시 질소탱크(5) 내부로 연장되는 형태로 구성될 수 있다. 질소순환라인(80)에는 질소탱크(5) 내부의 액체질소를 열교환기(6) 쪽으로 압송하는 질소펌프(81)와, 열교환기(6) 및 보조탱크(2)의 열교환부(2b)를 거쳐 질소탱크(5)로 복귀하는 질소가스를 감압 팽창시켜 일부 액화시키는 팽창장치(82)를 포함할 수 있다.The nitrogen circulation line 80 extends from the inside of the nitrogen tank 5 and passes through the spiral heat exchange unit 2b installed in a state immersed in the liquefied gas inside the heat exchanger 6 and the auxiliary tank 2, and then the nitrogen tank again. (5) It can be configured to extend inside. The nitrogen circulation line 80 includes a nitrogen pump 81 that pressurizes the liquid nitrogen inside the nitrogen tank 5 toward the heat exchanger 6, and the heat exchanger 2b of the heat exchanger 6 and the auxiliary tank 2. It may include an expansion device 82 that partially liquefies the nitrogen gas returned to the nitrogen tank 5 by expanding it under reduced pressure.

또 질소탱크(1)에는 내부를 설정한 압력으로 유지할 수 있도록 하는 압력조절부(5a)가 설치될 수 있다. 압력조절부(5a)는 질소탱크(5) 내부의 액체질소를 가열하여 기화시킨 후 질소탱크(5) 내부로 공급함으로써 질소탱크(5)의 압력을 상승시키는 방식이다.In addition, the nitrogen tank 1 may be provided with a pressure control unit 5a to maintain the inside at a set pressure. The pressure control unit 5a is a method of increasing the pressure of the nitrogen tank 5 by heating and vaporizing liquid nitrogen inside the nitrogen tank 5 and supplying it to the inside of the nitrogen tank 5.

질소순환라인(80)으로 공급되는 액체질소는 열교환기(6)로 공급되어 열교환을 통해 재액화라인(70)의 증발가스를 액화시키면서 기화되지만, 이러한 질소가 보조탱크(2)의 열교환부(2b)를 거치며 액화가스와 열교환하여 다시 냉각되고, 이 상태에서 팽창장치(82)를 거쳐 감압 팽창되는 과정에서 상당부분 액화된 후 질소탱크(5)로 복귀한다. 따라서 질소탱크(5)로 복귀하는 질소의 기화량을 최소화할 수 있다.Liquid nitrogen supplied to the nitrogen circulation line 80 is supplied to the heat exchanger 6 and vaporized while liquefying the boil-off gas of the re-liquefaction line 70 through heat exchange, but such nitrogen is vaporized in the heat exchange part of the auxiliary tank 2 ( After passing through 2b), it is cooled by heat exchange with the liquefied gas, and in this state, it is substantially liquefied in the process of expanding under reduced pressure through the expansion device 82 and then returned to the nitrogen tank 5. Therefore, it is possible to minimize the vaporization amount of nitrogen returned to the nitrogen tank (5).

질소탱크(5) 내부로 진입하는 질소순환라인(80)의 종단에는 액체질소에 잠긴상태로 설치되는 스파이럴형 열교환부(5a)가 마련될 수 있다. 이 열교환부(5a)는 질소탱크(5)로 복귀하는 질소가 질소탱크(5a) 내부로 배출되는 과정에서 질소탱크(5) 내부의 액체질소와 열교환하여 액화되도록 할 수 있다.At the end of the nitrogen circulation line 80 entering the inside of the nitrogen tank 5, a spiral heat exchange part 5a installed in a state immersed in liquid nitrogen may be provided. The heat exchange part 5a may heat exchange with liquid nitrogen in the nitrogen tank 5 to be liquefied in the process of discharging nitrogen returned to the nitrogen tank 5 into the nitrogen tank 5a.

질소액화라인(90)은 질소탱크(5) 내부의 질소가스가 질소압축기(91), 열교환기(6), 감압 팽창장치(92)를 순차적으로 거친 후 질소탱크(5)로 복귀하는 유로를 구성하도록 마련될 수 있다. 이는 질소가스를 질소압축기(91)에서 고압으로 압축한 후 열교환기(6)와 열교환을 통해 냉각시키고, 이를 팽창장치(92)에서 감암 팽창시킴으로써 질소가스를 액화시킬 수 있도록 한 것이다. 질소액화라인(90)에는 필요시 질소압축기(91)를 거친 질소가스의 냉각을 위한 열교환기(93)가 설치될 수 있다.The nitrogen liquefaction line 90 passes through the nitrogen gas inside the nitrogen tank 5 sequentially through the nitrogen compressor 91, the heat exchanger 6, and the decompression expansion device 92, and then returns to the nitrogen tank 5 in a flow path. It can be provided to configure. This allows nitrogen gas to be liquefied by compressing nitrogen gas at high pressure in the nitrogen compressor 91 and then cooling it through heat exchange with the heat exchanger 6, and expanding it under reduced pressure in the expansion device 92. A heat exchanger 93 for cooling nitrogen gas passing through the nitrogen compressor 91 may be installed in the nitrogen liquefaction line 90 if necessary.

또 질소액화라인(90)은 질소압축기(91)에서 압축된 질소가스가 제2연료공급라인(20) 외측을 포위하는 겹층배관(25) 내부를 통과하면서 이 겹층배관(25)의 퍼징(Purging)을 수행하도록 할 수 있다. 고압가스엔진(3)과 연결되는 제2연료공급라인(20)은 안전을 위해 2중 또는 3중의 겹층배관(25)으로 구성되고, 이 겹층배관(25)으로 질소와 같은 불활성가스를 공급해 퍼징을 수행하는데, 질소액화라인(90)의 질소가스가 열교환기(6) 쪽으로 공급되는 과정에서 겹층배관(25)을 통과하며 퍼징을 수행할 수 있도록 한 것이다.In addition, in the nitrogen liquefaction line 90, the nitrogen gas compressed by the nitrogen compressor 91 passes through the inside of the double layer pipe 25 surrounding the outside of the second fuel supply line 20, while purging the double layer pipe 25. ). The second fuel supply line 20 connected to the high-pressure gas engine 3 is composed of a double or triple double layer pipe 25 for safety, and is purged by supplying an inert gas such as nitrogen through the double layer pipe 25 In the process of supplying the nitrogen gas of the nitrogen liquefaction line 90 to the heat exchanger 6, it passes through the layered pipe 25 to perform purging.

이처럼 제1실시 예의 연료공급시스템은 질소탱크(1)의 질소가스를 질소액화라인(90)을 통해 재액화시킬 수 있기 때문에 질소의 보충이 없이도 증발가스의 연속적인 재액화를 수행할 수 있다. 또 질소가스를 액화시키는 과정에서 질소액화라인(90)의 질소가스가 엔진 연료계통의 겹층배관(25)을 통과하도록 하기 때문에 질소가스의 액화과정에서 연료계통 겹층배관(25)의 퍼징을 수행할 수 있다.As described above, since the fuel supply system of the first embodiment can re-liquefy the nitrogen gas in the nitrogen tank 1 through the nitrogen liquefaction line 90, it is possible to continuously re-liquefy the boil-off gas without supplementing nitrogen. In addition, since nitrogen gas in the nitrogen liquefaction line 90 passes through the double layer pipe 25 of the engine fuel system in the process of liquefying nitrogen gas, purging of the fuel system double layer pipe 25 is performed during the liquefaction process of nitrogen gas. I can.

도 2는 본 발명의 제2실시 예에 따른 연료공급시스템을 나타낸다. 제2실시 예는 질소액화라인(190)의 질소가스가 보조탱크(2) 내부의 액화가스와 열교환을 하도록 한 점에서 제1실시 예와 차별된다. 2 shows a fuel supply system according to a second embodiment of the present invention. The second embodiment is different from the first embodiment in that the nitrogen gas of the nitrogen liquefaction line 190 exchanges heat with the liquefied gas inside the auxiliary tank 2.

즉 제2실시 예에서 질소액화라인(190)은 질소탱크(5)의 질소가스가 질소압축기(91)에서 압축된 후, 제2연료공급라인(20)의 겹층배관(25)을 통과하면서 퍼징을 하고, 보조탱크(2) 내부의 열교환부(2c)를 통과하면서 액화가스에 의해 냉각되며, 이어 팽창장치(92)를 거치면서 액화된 후 질소탱크(5)로 복귀하도록 구성될 수 있다. 나머지는 전술한 제1실시 예와 동일하게 구성될 수 있다. That is, in the second embodiment, the nitrogen liquefaction line 190 is purged while passing through the layered pipe 25 of the second fuel supply line 20 after the nitrogen gas of the nitrogen tank 5 is compressed in the nitrogen compressor 91 It is cooled by liquefied gas while passing through the heat exchange part 2c inside the auxiliary tank 2, and then liquefied while passing through the expansion device 92, and then it may be configured to return to the nitrogen tank 5. The rest may be configured in the same manner as in the first embodiment described above.

1: 저장탱크, 2: 보조탱크,
3: 고압가스엔진, 4: 저압가스엔진,
5: 질소탱크, 6: 열교환기,
10: 제1연료공급라인, 20: 제2연료공급라인,
21: 고압펌프, 25: 겹층배관,
30: 제3연료공급라인, 31: 다단 압축기,
40: 제4연료공급라인, 50: 제5연료공급라인,
60: 벙커링라인, 70: 재액화라인,
80: 질소순환라인, 81: 질소펌프,
82: 팽창장치, 90: 질소액화라인,
91: 질소압축기, 92: 팽창장치.1: storage tank, 2: auxiliary tank,
3: high pressure gas engine, 4: low pressure gas engine,
5: nitrogen tank, 6: heat exchanger,
10: a first fuel supply line, 20: a second fuel supply line,
21: high pressure pump, 25: double layer piping,
30: third fuel supply line, 31: multistage compressor,
40: fourth fuel supply line, 50: fifth fuel supply line,
60: bunkering line, 70: reliquefaction line,
80: nitrogen circulation line, 81: nitrogen pump,
82: expansion device, 90: nitrogen liquefaction line,
91: nitrogen compressor, 92: expansion device.

Claims (7)

액화가스를 저장하는 저장탱크;
상기 저장탱크로부터 액화가스를 공급받아 저장하는 보조탱크;
상기 보조탱크에 저장된 액화가스를 처리하여 엔진으로 공급하는 연료공급라인;
액체질소를 저장하는 질소탱크;
상기 저장탱크의 증발가스를 상기 보조탱크 내부의 액화가스 및 열교환기와 열교환을 통해 액화시킨 후 상기 저장탱크로 복귀시키는 재액화라인; 및
상기 질소탱크의 액체질소를 상기 열교환기 및 상기 보조탱크 내부의 액화가스와 열교환 후에 상기 질소탱크로 복귀시키는 질소순환라인을 포함하는 연료공급시스템.A storage tank for storing liquefied gas;
An auxiliary tank receiving and storing liquefied gas from the storage tank;
A fuel supply line for processing the liquefied gas stored in the auxiliary tank and supplying it to the engine;
A nitrogen tank for storing liquid nitrogen;
A re-liquefaction line for liquefying the boil-off gas of the storage tank through heat exchange with the liquefied gas inside the auxiliary tank and a heat exchanger and then returning to the storage tank; And
A fuel supply system comprising a nitrogen circulation line for returning liquid nitrogen in the nitrogen tank to the nitrogen tank after heat exchange with the heat exchanger and liquefied gas in the auxiliary tank. 제1항에 있어서,
상기 재액화라인은 상기 보조탱크 내부의 액화가스에 잠긴상태로 설치되는 열교환부를 포함하는 연료공급시스템.The method of claim 1,
The reliquefaction line is a fuel supply system including a heat exchanger installed in a state immersed in the liquefied gas inside the auxiliary tank. 제1항에 있어서,
상기 질소순환라인은 상기 질소탱크 내부의 액체질소를 압송하는 질소펌프와, 상기 열교환기 및 상기 보조탱크를 거쳐 상기 질소탱크로 복귀하는 질소가스를 감압 팽창시키는 팽창장치를 포함하는 연료공급시스템.The method of claim 1,
The nitrogen circulation line is a fuel supply system including a nitrogen pump for pumping liquid nitrogen inside the nitrogen tank, and an expansion device for decompressing and expanding nitrogen gas returned to the nitrogen tank through the heat exchanger and the auxiliary tank. 삭제delete 삭제delete 삭제delete 삭제delete
KR1020140173548A 2014-12-05 2014-12-05 Fuel supply system KR102173909B1 (en)

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