KR20220068290A - Fuel Gas Supply System And Method For Ship - Google Patents

Fuel Gas Supply System And Method For Ship Download PDF

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KR20220068290A
KR20220068290A KR1020200154324A KR20200154324A KR20220068290A KR 20220068290 A KR20220068290 A KR 20220068290A KR 1020200154324 A KR1020200154324 A KR 1020200154324A KR 20200154324 A KR20200154324 A KR 20200154324A KR 20220068290 A KR20220068290 A KR 20220068290A
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South Korea
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gas
compressor
line
boil
fuel supply
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KR1020200154324A
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Korean (ko)
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박종환
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대우조선해양 주식회사
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Priority to KR1020200154324A priority Critical patent/KR20220068290A/en
Publication of KR20220068290A publication Critical patent/KR20220068290A/en

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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B17/00—Vessels parts, details, or accessories, not otherwise provided for
    • B63B17/0027—Tanks for fuel or the like ; Accessories therefor, e.g. tank filler caps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F02M21/0209—Hydrocarbon fuels, e.g. methane or acetylene
    • 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
    • F02M21/0245—High pressure fuel supply systems; Rails; Pumps; Arrangement of valves
    • 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
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • 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
    • 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
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • 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
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0171—Arrangement
    • F17C2227/0185—Arrangement comprising several pumps or compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by heating
    • 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
    • F17C2265/031—Treating the boil-off by discharge
    • 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
    • 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
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0105—Ships
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/50—Measures to reduce greenhouse gas emissions related to the propulsion system
    • Y02T70/5218—Less carbon-intensive fuels, e.g. natural gas, biofuels

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Ocean & Marine Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

Disclosed are a fuel gas supply system of a ship and a method thereof. According to the present invention, the fuel gas supply system of a ship comprises: a first compressor provided in a ship and receiving and compressing a boil-off gas generated from a storage tank in which a liquefied gas is stored; a second compressor provided in parallel with the first compressor and compressing the boil-off gas; a first fuel supply line connected from the first compressor to an inboard engine; a second fuel supply line connected from the second compressor to the first fuel supply line; a gas combustion line for sending the boil-off gas generated in the storage tank to a gas combustion unit (GCU); a connection line branched from the second fuel supply line and connected to the gas combustion line; and a shut-off valve provided in the connection line.

Description

선박의 연료가스공급시스템 및 방법{Fuel Gas Supply System And Method For Ship}Fuel Gas Supply System And Method For Ship

본 발명은 선박의 연료가스공급시스템 및 방법에 관한 것으로, 더욱 상세하게는 제1 압축기와 병렬로 마련된 제2 압축기로부터 선내 엔진으로 연결되는 제2 연료공급라인에서 연결라인을 분기하여, 저장탱크에서 발생하는 증발가스를 GCU로 보내는 가스연소라인으로 연결하되, 연결라인에 차단밸브를 마련하는 연료가스공급시스템 및 방법에 관한 것이다. The present invention relates to a fuel gas supply system and method for a ship, and more particularly, by branching a connection line from a second fuel supply line connected to an onboard engine from a second compressor provided in parallel with the first compressor, It relates to a fuel gas supply system and method for connecting the generated boil-off gas to a gas combustion line that sends it to the GCU, but providing a shut-off valve in the connection line.

천연가스(natural gas)는 메탄(methane)을 주성분으로 하고, 소량의 에탄(ethane), 프로판(propane) 등을 포함하는 화석연료로서, 최근 다양한 기술 분야에서 저공해 에너지원으로서 각광받고 있다.Natural gas is a fossil fuel containing methane as a main component and a small amount of ethane, propane, and the like, and has recently been spotlighted as a low-pollution energy source in various technological fields.

천연가스는 경제성이 있고 친환경적인 에너지로 많이 소비되고 있으나, 기체인 천연가스 상태로 이송하기에는 부피가 커서 운송 및 저장 효율이 떨어진다. Natural gas is widely consumed as an economical and eco-friendly energy, but transport and storage efficiency is low because of its large volume to be transported in the gaseous natural gas state.

이러한 점을 보완하기 위해, 액화천연가스(Liquefied Natural Gas, LNG) 상태로 운송 및 저장하는 방법이 제시되었다. 액화천연가스는 메탄을 주성분으로 한 천연가스를 대기압에서 -162℃의 극저온 상태로 냉각시켜 그 부피를 600분의 1로 줄인 무색 투명한 초저온 액체로서, 기체상태보다 수송성과 저장성이 우수한 것으로 알려져 있다.In order to supplement this point, a method of transporting and storing liquefied natural gas (LNG) in the state has been proposed. Liquefied natural gas is a colorless and transparent ultra-low temperature liquid whose volume is reduced to 1/600 by cooling natural gas containing methane as its main component from atmospheric pressure to a cryogenic state of -162°C.

그러나 천연가스 액화온도는 상압 -162℃의 극저온이므로, LNG는 온도변화에 민감하여 쉽게 증발된다. LNG 운반선의 LNG 저장탱크의 경우 단열처리가 되어 있기는 하지만, 외부의 열이 LNG 저장탱크에 지속적으로 전달되므로, LNG 운반선에 의한 LNG 수송과정에서 LNG가 LNG 저장탱크 내에서 지속적으로 자연 기화되어 LNG 저장 탱크 내에 증발가스(Boil-Off Gas, BOG)가 발생한다.However, since the natural gas liquefaction temperature is a cryogenic temperature of -162°C under normal pressure, LNG is sensitive to temperature changes and evaporates easily. Although the LNG storage tank of an LNG carrier is insulated, external heat is continuously transferred to the LNG storage tank, so the LNG is continuously naturally vaporized in the LNG storage tank during the course of LNG transportation by the LNG carrier. Boil-Off Gas (BOG) is generated in the storage tank.

BOG는 일종의 LNG 손실로서 LNG의 수송효율에 있어서 중요한 문제이며, LNG 저장탱크 내에 증발가스가 축적되면 LNG 저장탱크 내의 압력이 과도하게 상승하여 탱크가 파손될 위험이 있으므로, LNG 저장탱크 내에서 발생하는 BOG를 처리하기 위한 다양한 방법이 연구되고 있다.BOG is a kind of LNG loss and is an important problem in the transport efficiency of LNG. If boil-off gas is accumulated in the LNG storage tank, the pressure in the LNG storage tank increases excessively and there is a risk of the tank being damaged. Various methods are being studied to deal with it.

최근에는 BOG의 처리를 위해, BOG를 재액화하여 저장탱크로 복귀시키는 방법, BOG를 선박의 엔진의 에너지원으로 사용하는 방법 등이 사용되고 있다. 그리고 잉여의 BOG에 대해서는 가스연소유닛(gas combustion unit, GCU)에서 연소시키는 방법을 사용하고 있다. Recently, for the treatment of BOG, a method of re-liquefying BOG and returning it to a storage tank, a method of using BOG as an energy source of a ship's engine, etc. are used. And for the surplus BOG, a method of burning in a gas combustion unit (GCU) is used.

또한, LNG 운반선 자체에서 추진 장치나 발전 장치에서 자연 기화 또는 강제 기화된 가스와 연료유를 연료로 사용할 수 있는 이중연료 엔진(Dual Fuel Engine)이 개발되어 메인 엔진 및 제너레이터 엔진으로 사용되고 있어, BOG가 선내 연료로 공급되기도 한다. In addition, a dual fuel engine that can use natural or forced gas and fuel oil as fuel in the propulsion device or power generation device of the LNG carrier itself has been developed and is being used as the main engine and generator engine. It is also supplied as onboard fuel.

BOG 즉, 천연가스를 연료로 사용할 수 있는 선박용 엔진으로 DF 엔진, X-DF 엔진, ME-GI 엔진 등을 대표적인 예로 들 수 있다.A DF engine, an X-DF engine, a ME-GI engine, etc. are representative examples of BOG, that is, a marine engine that can use natural gas as a fuel.

DF 엔진(DFDE, DFGE)은, 4행정으로 구성되며, 비교적 저압인 5.5 barg 정도의 압력을 가지는 천연가스를 연소공기 입구에 주입하여, 피스톤이 올라가면서 압축을 시키는 오토 사이클(Otto Cycle)을 채택하고 있다.The DF engine (DFDE, DFGE) is composed of 4 strokes, and the Otto Cycle is adopted, which injects natural gas with a relatively low pressure of 5.5 barg into the combustion air inlet and compresses the piston as it rises. are doing

X-DF 엔진은, 2행정으로 구성되고, 12 내지 15 barg 정도의 천연가스를 연료로 사용하며, 오토 사이클을 채택하고 있다.The X-DF engine is composed of two strokes, uses 12 to 15 barg of natural gas as fuel, and adopts an auto cycle.

ME-GI 엔진은, 2행정으로 구성되며, 300 barg 부근의 고압 천연가스를 피스톤의 상사점 부근에서 연소실에 직접 분사하는 디젤 사이클(Diesel Cycle)을 채택하고 있다.The ME-GI engine is composed of two strokes and adopts a diesel cycle in which high-pressure natural gas near 300 barg is directly injected into the combustion chamber near top dead center of the piston.

저장탱크에서 발생하는 증발가스를 연료로 공급받는 엔진이 선박에 마련되는 경우, 증발가스는 엔진의 연료 공급 조건에 맞추어 엔진으로 공급된다. When an engine that receives boil-off gas generated from the storage tank as fuel is provided in the ship, the boil-off gas is supplied to the engine in accordance with the fuel supply condition of the engine.

증발가스를 엔진에서 요구하는 압력과 온도로 조절하기 위해 연료공급시스템은 압축기, 히터 등의 장치를 구비하여 구성된다. In order to control the boil-off gas to the pressure and temperature required by the engine, the fuel supply system is configured with devices such as a compressor and a heater.

이와 같은 연료공급시스템에서는, 선박 규정상 엔진으로 연료를 공급하는 압축기는, 비상 상황을 대비하여 리던던시(Redundancy) 설계를 하여야 한다. 리던던시 설계란, 어느 한 대를 고장, 유지보수 등의 이유로 사용할 수 없을 때 다른 한 대를 대신 사용할 수 있도록 설계하는 것을 의미한다.In such a fuel supply system, a compressor that supplies fuel to an engine according to ship regulations must be designed for redundancy in preparation for an emergency situation. Redundancy design refers to designing so that when one unit cannot be used due to failure or maintenance, the other unit can be used instead.

그런데, 연료공급시스템에서 리던던시용 압축기에서 연결되는 배관과, 선내 GCU(Gas Combustion Unit)로 연결되는 배관이 같은 선상에 설치되는 경우가 있고, 이 때 저장탱크의 내압이 높아져 저장탱크로부터 GCU로 증발가스를 보내는 배관을 열어 Gas Burning하게 되면, 같은 선상에 설치되는 리던던시용 압축기도 운전을 못하게 되는 시스템 운용 상의 제약이 발생한다. 이를 해결하고자 각 배관을 분리하여 같은 선상에 설치하지 않게 되면, Gas Burning 시 점차 저장탱크의 내압이 낮아져 Freeflow Mode로 GCU에 증발가스를 보낼 수 없어질 때(freeflow stop), 바로 리던던시용 압축기를 이용하여 증발가스를 GCU로 보내는 GCU line-up이 어렵고, 전환을 위한 시간이 소요되어 운용 시간이 늘어나는 문제가 있다.However, in the fuel supply system, there are cases where the piping connected from the redundancy compressor and the piping connected to the onboard GCU (Gas Combustion Unit) are installed on the same line. If gas burning is performed by opening the pipe that sends gas, there is a system operation restriction that prevents the operation of the redundancy compressor installed on the same line. In order to solve this problem, if each pipe is not separated and installed on the same line, the internal pressure of the storage tank gradually decreases during gas burning. Therefore, it is difficult to line-up the GCU to send the boil-off gas to the GCU, and it takes time for conversion, which increases the operating time.

본 발명은 이러한 문제를 해결하여, Gas Burning시에도 압축기의 운용 상 제약을 없애 엔진으로 연료를 공급할 수 있으면서, freeflow stop 시 바로 GCU line-up할 수 있도록 하는 연료공급시스템을 제안하고자 한다. The present invention is to solve this problem and propose a fuel supply system that can supply fuel to the engine by eliminating the operational restrictions of the compressor even during gas burning, while allowing the GCU line-up to be performed immediately when the freeflow stops.

상술한 과제를 해결하기 위한 본 발명의 일 측면에 따르면, 선박에 마련되며 액화가스가 저장된 저장탱크로부터 발생하는 증발가스를 공급받아 압축하는 제1 압축기; According to one aspect of the present invention for solving the above problems, a first compressor provided on a ship and compressed by receiving boil-off gas generated from a storage tank in which liquefied gas is stored;

상기 제1 압축기와 병렬로 마련되며 증발가스를 압축하는 제2 압축기; a second compressor provided in parallel with the first compressor to compress the boil-off gas;

상기 제1 압축기에서 선내 엔진으로 연결되는 제1 연료공급라인; a first fuel supply line connected from the first compressor to the onboard engine;

상기 제2 압축기로부터 상기 제1 연료공급라인으로 연결되는 제2 연료공급라인; a second fuel supply line connected from the second compressor to the first fuel supply line;

상기 저장탱크에서 발생하는 증발가스를 GCU(Gas Combustion Unit)로 보내는 가스연소라인;a gas combustion line for sending the boil-off gas generated from the storage tank to a gas combustion unit (GCU);

상기 제2 연료공급라인에서 분기되어 상기 가스연소라인으로 연결되는 연결라인; 및a connection line branched from the second fuel supply line and connected to the gas combustion line; and

상기 연결라인에 마련되는 차단밸브:를 포함하는 선박의 연료가스공급시스템이 제공된다.A shut-off valve provided on the connection line: A fuel gas supply system for a ship is provided, including.

바람직하게는, 상기 저장탱크의 내압 상승으로 상기 저장탱크의 증발가스를 자유흐름 모드(Freeflow Mode)로 상기 가스연소라인을 통해 상기 GCU로 보낼 때, 상기 차단밸브를 통해 상기 연결라인을 차단할 수 있다.Preferably, when the boil-off gas of the storage tank is sent to the GCU through the gas combustion line in a freeflow mode due to an increase in the internal pressure of the storage tank, the connection line may be blocked through the shut-off valve .

바람직하게는, 상기 제1 연료공급라인에서 상기 제2 연료공급라인의 합류 지점 전단에 마련되는 제1 밸브; 상기 제2 연료공급라인에서 상기 연결라인의 분기 지점 전단에 마련되는 제2 밸브; 및 상기 제2 연료공급라인에서 상기 연결라인의 분기 지점 후단에 마련되는 제3 밸브:를 더 포함할 수 있다. Preferably, the first valve provided in the front end of the junction of the second fuel supply line in the first fuel supply line; a second valve provided in front of a branch point of the connection line in the second fuel supply line; and a third valve provided at a rear end of a branch point of the connection line in the second fuel supply line.

바람직하게는, 상기 가스연소라인에는 상기 저장탱크에서 공급되는 증발가스를 압축하는 VR 압축기; 및 상기 VR 압축기에서 압축된 증발가스를 가열하는 VR 히터:가 마련되고, 상기 VR 압축기 및 VR 히터를 거친 증발가스를 상기 저장탱크로 보내 웜 업(warm up)할 수 있다. Preferably, the gas combustion line includes a VR compressor for compressing the boil-off gas supplied from the storage tank; and a VR heater for heating the boil-off gas compressed in the VR compressor: may be provided, and warm up by sending the boil-off gas that has passed through the VR compressor and the VR heater to the storage tank.

본 발명의 다른 측면에 따르면, 액화가스가 저장된 저장탱크로부터 발생하는 증발가스를 공급받아 압축하는 제1 압축기와, 상기 제1 압축기와 병렬로 마련되어 증발가스를 압축하는 제2 압축기가 마련된 선박에서. According to another aspect of the present invention, in a ship provided with a first compressor for receiving and compressing boil-off gas generated from a storage tank in which liquefied gas is stored, and a second compressor provided in parallel with the first compressor to compress boil-off gas.

상기 제1 압축기에서 선내 엔진으로 제1 연료공급라인이 연결되고, 상기 제2 압축기로부터 상기 제1 연료공급라인으로 제2 연료공급라인이 연결되며,A first fuel supply line is connected from the first compressor to the onboard engine, and a second fuel supply line is connected from the second compressor to the first fuel supply line,

상기 제2 연료공급라인에서 연결라인이 분기되어 상기 저장탱크에서 발생하는 증발가스를 GCU(Gas Combustion Unit)로 보내는 가스연소라인으로 연결되되, A connection line is branched from the second fuel supply line and is connected to a gas combustion line that sends boil-off gas generated from the storage tank to a gas combustion unit (GCU),

상기 연결라인에 차단밸브를 마련하여, 상기 저장탱크의 내압 상승으로 상기 저장탱크의 증발가스를 자유흐름 모드(Freeflow Mode)로 상기 가스연소라인을 통해 상기 GCU로 보낼 때, 상기 차단밸브를 통해 상기 연결라인을 차단할 수 있는 것을 특징으로 하는 선박의 연료가스공급방법이 제공된다. By providing a shut-off valve in the connection line, when the boil-off gas of the storage tank is sent to the GCU through the gas combustion line in a free flow mode due to an increase in the internal pressure of the storage tank, through the shut-off valve There is provided a fuel gas supply method for a ship, characterized in that the connection line can be blocked.

바람직하게는, 상기 제1 연료공급라인에서 상기 제2 연료공급라인의 합류 지점 전단에는 제1 밸브, 상기 제2 연료공급라인에서 상기 연결라인의 분기 지점 전단에는 제2 밸브, 상기 제2 연료공급라인에서 상기 연결라인의 분기 지점 후단에는 제3 밸브가 각 마련되고, 상기 저장탱크의 압력이 낮아져 자유흐름 모드 중단(Freeflow stop) 시 상기 제3 밸브를 닫고 상기 차단밸브를 열어 상기 제2 압축기에 의해 GCU로 증발가스를 보낼 수 있다. Preferably, a first valve in the first fuel supply line at the front end of the junction of the second fuel supply line, a second valve at the front end of the branching point of the connection line in the second fuel supply line, and the second fuel supply In the line, a third valve is provided at the rear end of the branch point of the connection line, and when the pressure in the storage tank is lowered to stop the free flow mode, the third valve is closed and the shut-off valve is opened to the second compressor. BOG can be sent to the GCU by

바람직하게는, 상기 가스연소라인에는 상기 저장탱크에서 공급되는 증발가스를 압축하는 VR 압축기; 및 상기 VR 압축기에서 압축된 증발가스를 가열하는 VR 히터:가 마련되고, 상기 VR 압축기 및 VR 히터를 거친 증발가스를 상기 저장탱크로 보내 웜 업(warm up)할 수 있다. Preferably, the gas combustion line includes a VR compressor for compressing the boil-off gas supplied from the storage tank; and a VR heater for heating the boil-off gas compressed in the VR compressor: may be provided, and warm up by sending the boil-off gas that has passed through the VR compressor and the VR heater to the storage tank.

본 발명에서는 제1 압축기와 병렬로 마련된 제2 압축기로부터 선내 엔진으로 연결되는 제2 연료공급라인에서 연결라인을 분기하여, 저장탱크에서 발생하는 증발가스를 GCU(Gas Combustion Unit)로 보내는 가스연소라인으로 연결하되, 연결라인에 차단밸브를 마련한다. In the present invention, a gas combustion line that branches the connection line from the second fuel supply line connected to the onboard engine from the second compressor provided in parallel with the first compressor, and sends boil-off gas generated from the storage tank to the GCU (Gas Combustion Unit). to connect, but provide a shut-off valve in the connection line.

저장탱크로부터 자유흐름 모드(Freeflow Mode)로 가스연소라인을 통해 GCU로 보낼 때, 차단밸브를 통해 연결라인을 차단함으로써 Gas Burning시에도 제2 압축기의 운용 상 제약을 없애 선내 엔진으로 연료를 공급할 수 있다. 또한 GCU로 연결되는 가스연소라인과 제2 압축기가 연결라인을 통해 같은 선상에 설치됨으로써, freeflow stop 시 제2 압축기에 의해 바로 GCU line-up할 수 있어 운용 시간을 단축할 수 있다.When sending from the storage tank to the GCU through the gas combustion line in the freeflow mode, the connection line is cut off through the shut-off valve, so that even during gas burning, fuel can be supplied to the onboard engine by eliminating the operational restrictions of the second compressor. have. In addition, since the gas combustion line and the second compressor connected to the GCU are installed on the same line through the connection line, the GCU line-up can be directly performed by the second compressor when the freeflow is stopped, thereby reducing the operating time.

도 1은 본 발명의 기본 실시예에 따른 선박의 연료가스공급시스템을 개략적으로 도시한다.
도 2는 본 발명의 일 실시예에 따른 선박의 연료가스공급시스템을 개략적으로 도시한다. 1 schematically shows a fuel gas supply system for a ship according to a basic embodiment of the present invention.
2 schematically shows a fuel gas supply system for a ship according to an embodiment of the present invention.

본 발명의 동작상 이점 및 본 발명의 실시에 의하여 달성되는 목적을 충분히 이해하기 위해서는 본 발명의 바람직한 실시예를 예시하는 첨부도면 및 첨부도면에 기재된 내용을 참조하여야만 한다.In order to fully understand the operational advantages of the present invention and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

이하 첨부한 도면을 참조하여 본 발명의 바람직한 실시예에 대해 구성 및 작용을 상세히 설명하면 다음과 같다. 여기서 각 도면의 구성요소들에 대해 참조 부호를 부가함에 있어 동일한 구성요소들에 한해서는 비록 다른 도면상에 표시되더라도 가능한 한 동일한 부호로 표기되었음에 유의하여야 한다.Hereinafter, the configuration and operation of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Here, it should be noted that in adding reference signs to the elements of each drawing, the same elements are indicated with the same reference numerals as much as possible even though they are indicated on different drawings.

도 1에는 본 발명의 기본 실시예에 따른 선박의 연료공급시스템을 개략적으로 도시하였고, 도 2에는 기본 실시예에 일부 구성을 추가한 본 발명의 일 실시예에 따른 선박의 연료공급시스템을 개략적으로 도시하였다. 1 schematically shows a fuel supply system for a vessel according to a basic embodiment of the present invention, and FIG. 2 schematically shows a fuel supply system for a vessel according to an embodiment of the present invention with some components added to the basic embodiment. shown.

도 1 및 도 2에 도시된 바와 같이, 본 실시예들의 선박의 연료가스공급시스템은, 선박에 마련되며 액화가스가 저장된 저장탱크(미도시)로부터 발생하는 증발가스를 공급받아 압축하는 제1 압축기(100A), 제1 압축기와 병렬로 마련되며 증발가스를 압축하는 제2 압축기(100B), 제1 압축기에서 선내 엔진으로 연결되는 제1 연료공급라인(SL1), 제2 압축기로부터 제1 연료공급라인으로 연결되는 제2 연료공급라인(SL2)을 포함하여, 선박의 저장탱크에서 발생하는 증발가스를 선내 엔진의 연료로 공급할 수 있는 시스템이다. 1 and 2, the fuel gas supply system of the ship of the present embodiments is provided in the ship and the first compressor receives and compresses boil-off gas generated from a storage tank (not shown) in which liquefied gas is stored. (100A), a second compressor (100B) provided in parallel with the first compressor and compressing boil-off gas, a first fuel supply line (SL1) connected from the first compressor to the onboard engine, and a first fuel supply from the second compressor Including the second fuel supply line (SL2) connected to the line, it is a system capable of supplying boil-off gas generated in the storage tank of the ship as fuel for the onboard engine.

제1 및 제2 압축기에서 압축된 증발가스를 공급받는 선내 엔진(E)은 예를 들어 DFGE(Dual Fuel Generator Engine) 또는 DFDG((Dual Fuel Diesel Generator)와 같은 발전엔진일 수 있다. The onboard engine E receiving the boil-off gas compressed from the first and second compressors may be, for example, a power generation engine such as a Dual Fuel Generator Engine (DFGE) or a Dual Fuel Diesel Generator (DFDG).

제1 및 제2 압축기(100A, 100B)는 증발가스를 공급받아 엔진에서 필요한 연료공급압력으로 압축하며, 제2 압축기(100B)는 리던던시(Redundancy) 설계를 위해 제1 압축기(100A)와 나란히 마련된 것일 수 있다. The first and second compressors 100A and 100B receive boil-off gas and compress it to the fuel supply pressure required by the engine, and the second compressor 100B is provided side by side with the first compressor 100A for redundancy design. it could be

제1 및 제2 압축기는 복수의 컴프레서와 중간 냉각기가 번갈아 배치되어 발전엔진보다 고압 연료를 공급받는 주엔진(main engine)의 연료공급압력으로 증발가스를 압축하는 다단압축기일 수 있고, 이 때 발전엔진(E)으로는 다단압축기의 일부 단을 거쳐 압축된 증발가스가 연료로 공급될 수 있다. 이 경우 제1 연료공급라인은 제1 압축기의 중간 단에서 발전엔진으로 연결되고, 제2 연료공급라인 역시 제2 압축기의 중간 단에서 제2 연료공급라인으로 연결된다. The first and second compressors may be a multi-stage compressor in which a plurality of compressors and an intermediate cooler are alternately disposed to compress the boil-off gas to the fuel supply pressure of a main engine that receives high-pressure fuel than the power generation engine, at this time BOG compressed through some stages of the multi-stage compressor may be supplied to the engine E as fuel. In this case, the first fuel supply line is connected to the power generation engine from the middle stage of the first compressor, and the second fuel supply line is also connected to the second fuel supply line from the middle stage of the second compressor.

저장탱크로부터 증발가스를 GCU(Gas Combustion Unit)로 보내는 가스연소라인(GL)이 연결되며, 제2 연료공급라인(SL2)에서 분기되어 가스연소라인으로 연결되는 연결라인(CL)이 마련되어, 제2 압축기로부터의 배관이 GCU로 연결되는 가스연소라인과 같은 선상에 마련된다. A gas combustion line (GL) that sends boil-off gas from the storage tank to the GCU (Gas Combustion Unit) is connected, and a connection line (CL) branched from the second fuel supply line (SL2) and connected to the gas combustion line is provided. 2 The piping from the compressor is provided on the same line as the gas combustion line leading to the GCU.

제1 연료공급라인(SL1)에서 제2 연료공급라인(SL2)의 합류 지점 전단에는 제1 밸브(SV1)가, 제2 연료공급라인(SL2)에서 연결라인(CL)의 분기 지점 전단에는 제2 밸브(SV2)가, 제2 연료공급라인(SL2)에서 연결라인(CL)의 분기 지점 후단에는 제3 밸브(SV3)가 각각 마련된다. In the first fuel supply line (SL1), the first valve (SV1) is at the front end of the junction of the second fuel supply line (SL2), and in the second fuel supply line (SL2), the first valve (SV1) is at the front end of the branching point of the connection line (CL). The second valve SV2 and the third valve SV3 are respectively provided at the rear end of the branch point of the connection line CL in the second fuel supply line SL2 .

가스연소라인(GL)의 상류에는 저장탱크에서 공급되는 증발가스를 압축하는 VR 압축기(200A, 200B)와, VR 압축기에서 압축된 증발가스를 가열하는 VR 히터(210)가 마련되어, VR 압축기 및 VR 히터를 거친 증발가스를 저장탱크로 보내 저장탱크를 웜 업(warm up)할 수 있다. Upstream of the gas combustion line (GL), VR compressors 200A and 200B for compressing the boil-off gas supplied from the storage tank, and a VR heater 210 for heating the boil-off gas compressed in the VR compressor are provided, the VR compressor and VR It is possible to warm up the storage tank by sending the boil-off gas that has passed through the heater to the storage tank.

가스연소라인(GL)에는 GCU로의 증발가스 공급을 조절 및 차단하기 위한 밸브(GV1, GV2)가 마련된다. The gas combustion line GL is provided with valves GV1 and GV2 for controlling and blocking the supply of boil-off gas to the GCU.

도 1의 기본 실시예에서는 제2 압축기로부터의 배관이 GCU로 연결되는 가스연소라인과 같은 선상에 마련되므로 Gas Burnig 시 점차 저장탱크의 내압이 낮아져 Freeflow Mode로 GCU에 증발가스를 보낼 수 없어지면(freeflow stop), 바로 제2 압축기를 이용하여 GCU line-up이 가능하다. 다만, Freeflow Mode로 저장탱크로부터 가스연소라인을 통해 GCU로 증발가스를 보내 Gas Burning하게 되면, 연결라인으로 인해 같은 선상에 설치되는 제2 압축기도 운전을 못하게 되는 시스템 운용 상의 제약이 있다. In the basic embodiment of FIG. 1, since the pipe from the second compressor is provided on the same line as the gas combustion line connected to the GCU, the internal pressure of the storage tank is gradually lowered during gas burning. stop), directly using the second compressor, GCU line-up is possible. However, if the boil-off gas is sent from the storage tank to the GCU through the gas combustion line in the freeflow mode for gas burning, the second compressor installed on the same line due to the connection line is also restricted from operation.

이를 해결하고자 도 2에 도시된 실시예 시스템에서는 연결라인(CL)에 차단밸브(remote isolation valve, IV)를 마련하여, 저장탱크의 내압 상승으로 저장탱크의 증발가스를 자유흐름 모드(Freeflow Mode)로 가스연소라인(GL)을 통해 GCU로 보낼 때, 차단밸브(IV)를 통해 연결라인(CL)을 차단할 수 있게 구성하였다. 이와 같이 차단밸브(IV)를 통해 연결라인(CL)을 차단함으로써 자유흐름 모드에 의해 Gas Burning시에도 제2 압축기(100B)를 운전하여 선내 엔진으로 연료를 공급할 수 있다. In order to solve this problem, in the embodiment system shown in FIG. 2, a remote isolation valve (IV) is provided in the connection line (CL), and the boil-off gas of the storage tank is discharged into a free flow mode due to an increase in the internal pressure of the storage tank. When sending to the GCU through the furnace gas combustion line (GL), the connection line (CL) can be blocked through the shut-off valve (IV). In this way, by blocking the connection line CL through the shut-off valve IV, fuel can be supplied to the onboard engine by operating the second compressor 100B even during gas burning in the free-flow mode.

Gas Burning이 진행되면서 점차 저장탱크의 압력이 낮아져 자유흐름 모드로 GCU에 증발가스를 공급할 수 없어지면, 자유흐름 모드를 중단(Freeflow stop)하고 제3 밸브(SV3)를 닫고 차단밸브(IV)를 열어 제2 압축기(100B) 및 연결라인(CL)을 통해 GCU로 증발가스를 보낼 수 있다. 이와 같이 Freeflow stop 시 제2 압축기에 의해 바로 GCU line-up할 수 있어 운용 시간을 단축하고 신속하게 Gas Burning을 통해 저장탱크의 압력을 조절할 수 있다.As the gas burning progresses, the pressure in the storage tank gradually decreases and BOG cannot be supplied to the GCU in free-flow mode. Stop the free-flow mode, close the 3rd valve (SV3) and open the shut-off valve (IV). BOG may be sent to the GCU through the second compressor 100B and the connection line CL. In this way, when the freeflow is stopped, the GCU line-up can be directly performed by the second compressor, thereby reducing the operating time and quickly adjusting the pressure of the storage tank through gas burning.

본 발명은 상기 실시예에 한정되지 않고, 본 발명의 기술적 요지를 벗어나지 아니하는 범위 내에서 다양하게 수정 또는 변형되어 실시될 수 있음은 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 있어서 자명한 것이다. The present invention is not limited to the above embodiments, and it is apparent to those skilled in the art that various modifications or variations can be implemented without departing from the technical gist of the present invention. did it

100A; 제1 압축기
100B; 제2 압축기
200A, 200B: VR 압축기
210: VR 히터
SL1: 제1 연료공급라인
SL2: 제2 연료공급라인
CL: 연결라인
IV: 차단밸브
SV1, SV2, SV3: 제1 내지 제3 밸브 100A; first compressor
100B; 2nd compressor
200A, 200B: VR Compressor
210: VR heater
SL1: first fuel supply line
SL2: second fuel supply line
CL: connecting line
IV: shut-off valve
SV1, SV2, SV3: first to third valves

Claims (7)

선박에 마련되며 액화가스가 저장된 저장탱크로부터 발생하는 증발가스를 공급받아 압축하는 제1 압축기;
상기 제1 압축기와 병렬로 마련되며 증발가스를 압축하는 제2 압축기;
상기 제1 압축기에서 선내 엔진으로 연결되는 제1 연료공급라인;
상기 제2 압축기로부터 상기 제1 연료공급라인으로 연결되는 제2 연료공급라인;
상기 저장탱크에서 발생하는 증발가스를 GCU(Gas Combustion Unit)로 보내는 가스연소라인;
상기 제2 연료공급라인에서 분기되어 상기 가스연소라인으로 연결되는 연결라인; 및
상기 연결라인에 마련되는 차단밸브:를 포함하는 선박의 연료가스공급시스템. a first compressor provided on the ship and compressed by receiving boil-off gas generated from a storage tank in which liquefied gas is stored;
a second compressor provided in parallel with the first compressor to compress the boil-off gas;
a first fuel supply line connected from the first compressor to the onboard engine;
a second fuel supply line connected from the second compressor to the first fuel supply line;
a gas combustion line for sending the boil-off gas generated from the storage tank to a gas combustion unit (GCU);
a connection line branched from the second fuel supply line and connected to the gas combustion line; and
A shut-off valve provided in the connection line: A fuel gas supply system for a ship including a. 제 1항에 있어서,
상기 저장탱크의 내압 상승으로 상기 저장탱크의 증발가스를 자유흐름 모드(Freeflow Mode)로 상기 가스연소라인을 통해 상기 GCU로 보낼 때, 상기 차단밸브를 통해 상기 연결라인을 차단할 수 있는 것을 특징으로 하는 선박의 연료가스공급시스템. The method of claim 1,
When the boil-off gas of the storage tank is sent to the GCU through the gas combustion line in a freeflow mode due to an increase in the internal pressure of the storage tank, the connection line can be blocked through the shut-off valve Ship's fuel gas supply system. 제 2항에 있어서,
상기 제1 연료공급라인에서 상기 제2 연료공급라인의 합류 지점 전단에 마련되는 제1 밸브;
상기 제2 연료공급라인에서 상기 연결라인의 분기 지점 전단에 마련되는 제2 밸브; 및
상기 제2 연료공급라인에서 상기 연결라인의 분기 지점 후단에 마련되는 제3 밸브:를 더 포함하는 선박의 연료가스공급시스템. 3. The method of claim 2,
a first valve provided in front of the junction of the second fuel supply line in the first fuel supply line;
a second valve provided in front of a branch point of the connection line in the second fuel supply line; and
A fuel gas supply system for a ship further comprising: a third valve provided at a rear end of a branch point of the connection line in the second fuel supply line. 제 3항에 있어서, 상기 가스연소라인에는
상기 저장탱크에서 공급되는 증발가스를 압축하는 VR 압축기; 및
상기 VR 압축기에서 압축된 증발가스를 가열하는 VR 히터:가 마련되고,
상기 VR 압축기 및 VR 히터를 거친 증발가스를 상기 저장탱크로 보내 웜 업(warm up)할 수 있는 것을 특징으로 하는 선박의 연료가스공급시스템. According to claim 3, wherein the gas combustion line
VR compressor for compressing boil-off gas supplied from the storage tank; and
VR heater for heating the boil-off gas compressed in the VR compressor: is provided,
A fuel gas supply system for a ship, characterized in that it can warm up by sending the boil-off gas that has passed through the VR compressor and the VR heater to the storage tank. 액화가스가 저장된 저장탱크로부터 발생하는 증발가스를 공급받아 압축하는 제1 압축기와, 상기 제1 압축기와 병렬로 마련되어 증발가스를 압축하는 제2 압축기가 마련된 선박에서.
상기 제1 압축기에서 선내 엔진으로 제1 연료공급라인이 연결되고, 상기 제2 압축기로부터 상기 제1 연료공급라인으로 제2 연료공급라인이 연결되며,
상기 제2 연료공급라인에서 연결라인이 분기되어 상기 저장탱크에서 발생하는 증발가스를 GCU(Gas Combustion Unit)로 보내는 가스연소라인으로 연결되되,
상기 연결라인에 차단밸브를 마련하여, 상기 저장탱크의 내압 상승으로 상기 저장탱크의 증발가스를 자유흐름 모드(Freeflow Mode)로 상기 가스연소라인을 통해 상기 GCU로 보낼 때, 상기 차단밸브를 통해 상기 연결라인을 차단할 수 있는 것을 특징으로 하는 선박의 연료가스공급방법. In a ship provided with a first compressor for receiving and compressing boil-off gas generated from a storage tank in which liquefied gas is stored, and a second compressor provided in parallel with the first compressor to compress the boil-off gas.
A first fuel supply line is connected from the first compressor to the onboard engine, and a second fuel supply line is connected from the second compressor to the first fuel supply line,
A connection line is branched from the second fuel supply line and is connected to a gas combustion line that sends boil-off gas generated from the storage tank to a gas combustion unit (GCU),
By providing a shut-off valve in the connection line, when the boil-off gas of the storage tank is sent to the GCU through the gas combustion line in a free flow mode due to an increase in the internal pressure of the storage tank, through the shut-off valve, the A method of supplying fuel gas for a ship, characterized in that it can block the connection line. 제 5항에 있어서,
상기 제1 연료공급라인에서 상기 제2 연료공급라인의 합류 지점 전단에는 제1 밸브, 상기 제2 연료공급라인에서 상기 연결라인의 분기 지점 전단에는 제2 밸브, 상기 제2 연료공급라인에서 상기 연결라인의 분기 지점 후단에는 제3 밸브가 각 마련되고,
상기 저장탱크의 압력이 낮아져 자유흐름 모드 중단(Freeflow stop) 시 상기 제3 밸브를 닫고 상기 차단밸브를 열어 상기 제2 압축기에 의해 GCU로 증발가스를 보낼 수 있는 것을 특징으로 하는 선박의 연료가스공급방법. 6. The method of claim 5,
A first valve in the first fuel supply line at the front end of the junction of the second fuel supply line, a second valve at the front end of the branching point of the connection line in the second fuel supply line, and the connection in the second fuel supply line A third valve is provided at the rear end of the branch point of the line,
When the pressure in the storage tank is lowered to stop the freeflow mode, the third valve is closed and the shut-off valve is opened to send the boil-off gas to the GCU by the second compressor. Way. 제 6항에 있어서, 상기 가스연소라인에는
상기 저장탱크에서 공급되는 증발가스를 압축하는 VR 압축기; 및
상기 VR 압축기에서 압축된 증발가스를 가열하는 VR 히터:가 마련되고,
상기 VR 압축기 및 VR 히터를 거친 증발가스를 상기 저장탱크로 보내 웜 업(warm up)할 수 있는 것을 특징으로 하는 선박의 연료가스공급방법. The method of claim 6, wherein the gas combustion line
VR compressor for compressing boil-off gas supplied from the storage tank; and
VR heater for heating the boil-off gas compressed in the VR compressor: is provided,
The fuel gas supply method for a ship, characterized in that it can warm up by sending the boil-off gas that has passed through the VR compressor and the VR heater to the storage tank.
KR1020200154324A 2020-11-18 2020-11-18 Fuel Gas Supply System And Method For Ship KR20220068290A (en)

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