KR102295431B1 - Fuel gas supply system - Google Patents

Fuel gas supply system Download PDF

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KR102295431B1
KR102295431B1 KR1020170071528A KR20170071528A KR102295431B1 KR 102295431 B1 KR102295431 B1 KR 102295431B1 KR 1020170071528 A KR1020170071528 A KR 1020170071528A KR 20170071528 A KR20170071528 A KR 20170071528A KR 102295431 B1 KR102295431 B1 KR 102295431B1
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turbine
gas
engine
fuel
boil
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KR1020170071528A
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Korean (ko)
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KR20180134449A (en
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이호기
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삼성중공업 주식회사
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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 
    • 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
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
    • F02C3/04—Gas-turbine plants characterised by the use of combustion products as the working fluid having a turbine driving a compressor
    • 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
    • F02M21/0212—Hydrocarbon fuels, e.g. methane or acetylene comprising at least 3 C-Atoms, e.g. liquefied petroleum gas [LPG], propane or butane
    • 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
    • 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
    • F17C13/004—Details of vessels or of the filling or discharging of vessels for large storage vessels not under pressure
    • 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
    • B63B2770/00—
    • 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
    • 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
    • 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

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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)
  • Supercharger (AREA)

Abstract

연료가스 공급시스템이 개시된다. 본 발명의 실시 예에 의한 연료가스 공급시스템은 액화가스 및 액화가스의 증발가스를 저장하는 저장탱크; 제1엔진에서 방출하는 배기가스에 의해 구동하는 제1터빈; 제1터빈으로 공급되는 배기가스 중 일부를 공급받아 구동하는 제2터빈; 및 제2터빈과 동일 축으로 연결되며, 제2터빈에 의해 구동되는 증발가스압축기;를 포함하되, 증발가스압축기는 저장탱크로부터 공급받은 증발가스를 압축하여 제2엔진의 연료로 공급한다.A fuel gas supply system is disclosed. A fuel gas supply system according to an embodiment of the present invention includes: a storage tank for storing liquefied gas and boil-off gas of the liquefied gas; a first turbine driven by exhaust gas emitted from the first engine; a second turbine that receives a portion of the exhaust gas supplied to the first turbine and drives it; and a boil-off gas compressor connected to the same shaft as the second turbine and driven by the second turbine.

Description

연료가스 공급시스템{FUEL GAS SUPPLY SYSTEM}Fuel gas supply system {FUEL GAS SUPPLY SYSTEM}

본 발명은 연료가스 공급시스템에 관한 것이다.The present invention relates to a fuel gas supply system.

온실가스 및 각종 대기오염 물질의 배출에 대한 국제해사기구(IMO, International Maritime Organization)의 규제가 강화됨에 따라 조선 및 해운업계에서는 기존 연료인 중유, 디젤유의 이용을 대신하여, 청정 에너지원인 천연가스를 선박의 연료가스로 이용하는 경우가 많아지고 있다.As the International Maritime Organization (IMO)'s regulations on the emission of greenhouse gases and various air pollutants have been strengthened, the shipbuilding and shipping industry has been using natural gas as a clean energy source instead of using heavy oil and diesel oil, which are the existing fuels. It is increasingly used as fuel gas for ships.

연료가스 중에서 널리 이용되고 있는 천연가스(Natural Gas)는 메탄(Methane)을 주성분으로 하며, 통상적으로 그 부피를 1/600로 줄인 액화가스(Liquefied Gas) 상태로 변환시켜 저장 및 운반을 하고 있다.Natural gas, which is widely used among fuel gases, has methane as its main component, and is stored and transported by converting it into liquefied gas, which is usually reduced in volume by 1/600.

이러한 액화가스는 선체에 단열 처리되어 설치되는 저장탱크에 수용되어 저장 및 수송되며, 선박의 엔진은 액화가스 또는 증발가스(Boiled Off Gas) 등을 연료가스로 공급받아 구동된다. 여기서, 증발가스는 저장탱크 내부에 수용된 액화가스가 자연적으로 기화하여 발생되는 자연증발가스 및 액화가스를 강제적으로 기화시켜 생산한 강제증발가스를 포함한다. 액화가스 또는 증발가스는 압축 및 기화 등의 처리과정을 거쳐 엔진이 요구하는 조건에 맞추어 공급된다.Such liquefied gas is stored and transported by being accommodated in a storage tank installed in the hull with insulation treatment, and the engine of the ship is driven by receiving liquefied gas or boil-off gas (Boiled Off Gas) as fuel gas. Here, the boil-off gas includes natural evaporation gas generated by natural evaporation of the liquefied gas accommodated in the storage tank, and forced evaporation gas produced by forcibly vaporizing the liquefied gas. Liquefied gas or boil-off gas is supplied according to the conditions required by the engine through processing such as compression and vaporization.

선박의 엔진에는 DFDE(Dual Fuel Disel Electric) 엔진 등과 같은 저압(약 5~8bar)의 분사엔진 및 ME-GI 엔진(Man B&W 사의 Gas Injection 엔진)과 같은 고압(약 150~400bar)의 분사엔진이 널리 이용되고 있다. 또한 중압(약 16~18bar)의 연료가스로 연소가 가능한 중압가스 분사엔진이 개발되어 이용되고 있다. 통상적으로 이러한 엔진의 연소를 위해 외부의 공기를 흡입하여 엔진으로 공급하기 위한 터보차저(Turbo Charger)가 이용된다. In the engine of the ship, a low-pressure (about 5-8 bar) injection engine such as a DFDE (Dual Fuel Disel Electric) engine and a high-pressure (about 150-400 bar) injection engine such as an ME-GI engine (Man B&W's gas injection engine) are used. It is widely used. In addition, a medium pressure gas injection engine capable of combustion with fuel gas of medium pressure (about 16 to 18 bar) has been developed and used. In general, for combustion of such an engine, a turbocharger for supplying external air to the engine is used.

또, 저장탱크의 액화가스를 엔진의 연료공급조건에 맞게 고압펌프와 기화기에 의해 가압 및 기화시켜 엔진으로 공급하는 연료공급시스템이 개발되고 있다. 연료공급시스템은 메인엔진으로 공급되는 연료가스의 일부를 분기시켜, 감압밸브에 의해 감압한 후, DFDE 엔진 및 기타 시스템으로 공급하는 구성을 포함할 수 있다.In addition, a fuel supply system for supplying the liquefied gas from the storage tank to the engine by pressurizing and vaporizing it by a high-pressure pump and a vaporizer according to the fuel supply conditions of the engine is being developed. The fuel supply system may include a configuration for branching a portion of the fuel gas supplied to the main engine, reducing the pressure by the pressure reducing valve, and then supplying it to the DFDE engine and other systems.

이 경우, 고압펌프 등에 의해 가압된 연료가스를 다시 감압밸브에 의해 감압하는 과정을 거쳐야 하므로, 불필요한 에너지를 소비할 수 있다.In this case, since the fuel gas pressurized by the high-pressure pump or the like needs to be reduced again by the pressure reducing valve, unnecessary energy may be consumed.

상술한 터보차저 및 연료가스 감압과 관련된 종래기술로서, 한국공개특허 제10-2010-0035223호(2010. 04. 05. 공개) 및 한국공개특허 제10-2016-0113495호(2016.09.29. 공개)를 참조하기 바란다.As a prior art related to the above-described turbocharger and fuel gas decompression, Korean Patent Application Laid-Open No. 10-2010-0035223 (published on Apr. 05, 2010) and Korean Patent Application Laid-Open No. 10-2016-0113495 (published on Sep. 29, 2016) ), please refer to

한국공개특허 제10-2010-0035223호(2010. 04. 05. 공개)Korean Patent Publication No. 10-2010-0035223 (published on April 05, 2010) 한국공개특허 제10-2016-0113495호(2016.09.29. 공개)Korean Patent Publication No. 10-2016-0113495 (published on September 29, 2016)

본 발명의 실시 예는 제1터빈으로 공급되는 제1엔진의 배기가스 중 일부를 이용하여 제2터빈을 구동시키고, 제2터빈과 연결된 압축기를 이용하여 저장탱크로부터 공급받은 증발가스를 압축하여 제2엔진의 연료로 공급함으로써, 연료가스 공급을 위한 시스템 효율성을 향상시키는 연료가스 공급시스템을 제공하고자 한다. According to an embodiment of the present invention, the second turbine is driven using a portion of the exhaust gas of the first engine supplied to the first turbine, and the boil-off gas supplied from the storage tank is compressed using a compressor connected to the second turbine to produce An object of the present invention is to provide a fuel gas supply system that improves system efficiency for fuel gas supply by supplying it as fuel for two engines.

본 발명의 일 측면에 따르면, 액화가스 및 상기 액화가스의 증발가스를 저장하는 저장탱크; 제1엔진에서 방출하는 배기가스에 의해 구동하는 제1터빈; 상기 제1터빈으로 공급되는 상기 배기가스 중 일부를 공급받아 구동하는 제2터빈; 및 상기 제2터빈과 동일 축으로 연결되며, 상기 제2터빈에 의해 구동되는 증발가스압축기;를 포함하되, 상기 증발가스압축기는 상기 저장탱크로부터 공급받은 증발가스를 압축하여 제2엔진의 연료로 공급하는 연료가스 공급시스템이 제공될 수 있다.According to an aspect of the present invention, a storage tank for storing liquefied gas and boil-off gas of the liquefied gas; a first turbine driven by exhaust gas emitted from the first engine; a second turbine for receiving and driving a portion of the exhaust gas supplied to the first turbine; and a boil-off gas compressor connected in the same shaft as the second turbine and driven by the second turbine, wherein the boil-off gas compressor compresses the boil-off gas supplied from the storage tank to be used as fuel for the second engine. A fuel gas supply system for supplying may be provided.

상기 제1터빈과 동일 축으로 연결되며, 상기 제1터빈에 의해 구동되는 공기압축기를 더 포함하되, 상기 공기압축기는 외부로부터 공기를 흡입 및 압축하여 상기 제1엔진으로 공급할 수 있다.It may further include an air compressor connected to the same shaft as the first turbine and driven by the first turbine, wherein the air compressor may suck and compress air from the outside and supply it to the first engine.

상기 공기압축기와 상기 제1엔진을 연결하는 에어라인과, 상기 제1엔진과 상기 제1터빈을 연결하는 제1배기가스라인과, 상기 제1배기가스라인의 상기 제1터빈 전단으로부터 분기되어 상기 제2터빈과 상기 제1배기가스라인의 상기 제1터빈 후단을 연결하는 제2배기가스라인을 더 포함할 수 있다.an air line connecting the air compressor and the first engine, a first exhaust gas line connecting the first engine and the first turbine, and the first exhaust gas line branching from the front end of the first turbine A second exhaust gas line may further include a second turbine and a second exhaust gas line connecting a rear end of the first turbine to the first exhaust gas line.

상기 저장탱크로부터 공급받은 액화가스를 가압하는 고압펌프와, 상기 가압된 액화가스를 기화시켜 상기 제1엔진으로 공급하는 기화기와, 상기 저장탱크, 고압펌프, 기화기 및 제1엔진을 연결하는 제1연료공급라인과, 상기 저장탱크로부터 공급받은 증발가스를 상기 증발가스압축기를 거쳐 상기 제2엔진으로 공급하는 제2연료공급라인을 더 포함할 수 있다.A first connecting a high-pressure pump for pressurizing the liquefied gas supplied from the storage tank, a vaporizer for vaporizing the pressurized liquefied gas and supplying it to the first engine, and the storage tank, the high-pressure pump, the vaporizer and the first engine It may further include a fuel supply line and a second fuel supply line for supplying the boil-off gas supplied from the storage tank to the second engine through the boil-off gas compressor.

상기 제2연료공급라인의 상기 증발가스압축기 전단으로부터 분기되어, 상기 저장탱크로부터 공급받은 증발가스 중 일부를 압축하는 압축부와, 상기 압축된 증발가스를 상기 제1연료공급라인의 상기 기화기 후단으로 합류시키는 분기라인과, 상기 제1연료공급라인의 상기 합류된 지점 후단으로부터 분기되어 상기 제2연료공급라인의 상기 증발가스압축기 후단과 연결된 합류라인과, 상기 합류라인에 마련되며, 상기 합류라인을 통해 상기 제2엔진으로 공급되는 연료가스를 감압시키는 감압밸브를 더 포함할 수 있다.a compression unit branching from the front end of the boil-off gas compressor of the second fuel supply line and compressing some of the boil-off gas supplied from the storage tank, and the compressed boil-off gas to the rear end of the vaporizer of the first fuel supply line A branch line for merging, a merging line branched from the rear end of the merging point of the first fuel supply line and connected to the rear end of the BOG compressor of the second fuel supply line, and provided in the merging line, the merging line It may further include a pressure reducing valve for reducing the pressure of the fuel gas supplied to the second engine through the.

본 발명의 실시 예에 의한 연료가스 공급시스템은 제1터빈으로 공급되는 제1엔진의 배기가스 중 일부를 이용하여 제2터빈을 구동시키고, 제2터빈과 연결된 압축기를 이용하여 저장탱크로부터 공급받은 증발가스를 압축하여 제2엔진의 연료로 공급함으로써, 연료가스 공급을 위한 시스템 효율성을 높일 수 있다.In the fuel gas supply system according to an embodiment of the present invention, a second turbine is driven using a portion of the exhaust gas of the first engine supplied to the first turbine, and is supplied from a storage tank using a compressor connected to the second turbine. By compressing the boil-off gas and supplying it as the fuel of the second engine, it is possible to increase the efficiency of the system for supplying the fuel gas.

본 발명의 효과들은 이상에서 언급한 효과들로 제한되지 않으며, 언급되지 않은 또 다른 효과들은 청구범위의 기재로부터 당업자에게 명확하게 이해될 수 있을 것이다.Effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

도 1은 본 발명의 실시 예에 따른 연료가스 공급시스템을 도시한 것이다.1 shows a fuel gas supply system according to an 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 to the embodiments presented herein and may be embodied in other forms. The drawings may omit the illustration of parts irrelevant to the description in order to clarify the present invention, and may slightly exaggerate the size of the components to help understanding.

도 1을 참조하면, 본 발명의 실시 예에 의한 연료가스 공급시스템(100)은 선박 엔진이 요구하는 메탄가에 맞게 연료가스를 효과적으로 공급할 수 있다. 연료가스 공급시스템(100)은 예컨대 액화연료 운반선, 액화연료 RV(Regasification Vessel), 컨테이너선, 일반상선, LNG FPSO(Floating, Production, Storage and Off-loading), LNG FSRU(Floating Storage and Regasification Unit) 등을 포함하는 각종 선박에 구비될 수 있다.Referring to FIG. 1 , the fuel gas supply system 100 according to an embodiment of the present invention can effectively supply fuel gas according to the methane number required by the marine engine. The fuel gas supply system 100 is, for example, a liquefied fuel carrier, a liquefied fuel RV (Regasification Vessel), a container ship, a general merchant ship, an LNG FPSO (Floating, Production, Storage and Off-loading), an LNG FSRU (Floating Storage and Regasification Unit). It can be provided on various ships including the like.

연료가스 공급시스템(100)은 액화가스 및 액화가스의 증발가스를 저장하는 저장탱크(10)와, 제1엔진(E1)에서 방출하는 배기가스에 의해 구동하는 제1터빈(21)과, 제1터빈(21)으로 공급되는 배기가스 중 일부를 공급받아 구동하는 제2터빈(22)과, 제2터빈(22)과 동일 축으로 연결되며, 제2터빈(22)에 의해 구동되는 증발가스압축기(32)를 포함한다. 증발가스압축기(32)는 저장탱크(10)로부터 공급받은 증발가스를 압축하여 제2엔진(E2)의 연료로 공급한다.The fuel gas supply system 100 includes a storage tank 10 for storing liquefied gas and boil-off gas of the liquefied gas, a first turbine 21 driven by exhaust gas emitted from a first engine E1, and a first A second turbine 22 that receives and drives a portion of the exhaust gas supplied to the first turbine 21 , is connected to the second turbine 22 in the same axis, and is driven by the second turbine 22 . It includes a compressor (32). The boil-off gas compressor 32 compresses the boil-off gas supplied from the storage tank 10 and supplies it as fuel of the second engine E2.

또, 연료가스 공급시스템(100)은 제1터빈(21)과 동일 축으로 연결되며, 제1터빈(21)에 의해 구동되는 공기압축기(31)를 포함한다. 공기압축기(31)는 외부로부터 공기를 흡입 및 압축하여 제1엔진(E1)으로 공급한다.In addition, the fuel gas supply system 100 is connected to the first turbine 21 and the same shaft, and includes an air compressor 31 driven by the first turbine 21 . The air compressor 31 sucks and compresses air from the outside and supplies it to the first engine E1.

또, 연료가스 공급시스템(100)은 공기압축기(31)와 제1엔진(E1)을 연결하는 에어라인(L11)과, 제1엔진(E1)과 제1터빈(21)을 연결하는 제1배기가스라인(L12)과, 제1배기가스라인(L12)의 제1터빈(21) 전단으로부터 분기되어 제2터빈(22)과 제1배기가스라인(L12)의 제1터빈(21) 후단을 연결하는 제2배기가스라인(L13)을 포함한다.In addition, the fuel gas supply system 100 includes an air line L11 connecting the air compressor 31 and the first engine E1 and a first connecting the first engine E1 and the first turbine 21 . The exhaust gas line L12 and the rear end of the first turbine 21 of the first exhaust gas line L12 are branched from the front end of the second turbine 22 and the first exhaust gas line L12 It includes a second exhaust gas line (L13) connecting the.

또, 연료가스 공급시스템(100)은 저장탱크(10)로부터 공급받은 액화가스를 가압하는 고압펌프(40)와, 고압펌프(40)에 의해 가압된 액화가스를 기화시켜 제1엔진(E1)으로 공급하는 기화기(50)와, 저장탱크(10), 고압펌프(40), 기화기(50) 및 제1엔진(E1)을 연결하는 제1연료공급라인(L1)과, 저장탱크(10)로부터 공급받은 증발가스를 증발가스압축기(32)를 거쳐 제2엔진(E2)으로 공급하는 제2연료공급라인(L2)을 포함한다.In addition, the fuel gas supply system 100 includes a high-pressure pump 40 for pressurizing the liquefied gas supplied from the storage tank 10 and a first engine E1 by vaporizing the liquefied gas pressurized by the high-pressure pump 40 . The first fuel supply line L1 connecting the carburetor 50 supplied to the and a second fuel supply line (L2) for supplying the BOG supplied from the BOG to the second engine (E2) through the BOG compressor (32).

또, 연료가스 공급시스템(100)은 제2연료공급라인(L2)의 증발가스압축기(32) 전단으로부터 분기되어, 저장탱크(10)로부터 공급받은 증발가스 중 일부를 압축하는 압축부(60)와, 압축부(60)에 의해 압축된 증발가스를 제1연료공급라인(L1)의 기화기(50) 후단으로 합류시키는 분기라인(L3)과, 제1연료공급라인(L1)의 합류된 지점 후단으로부터 분기되어 제2연료공급라인(L2)의 증발가스압축기(32) 후단과 연결된 합류라인(L4)과, 합류라인(L4)에 마련되며, 합류라인(L4)을 통해 제2엔진(E2)으로 공급되는 연료가스를 감압시키는 감압밸브(70)를 포함한다.In addition, the fuel gas supply system 100 is branched from the front end of the BOG compressor 32 of the second fuel supply line L2, and a compression unit 60 for compressing some of the BOG supplied from the storage tank 10. and a branch line (L3) for merging the boil-off gas compressed by the compression unit (60) to the rear end of the carburetor 50 of the first fuel supply line (L1), and the first fuel supply line (L1). The merging line L4 branched from the rear end and connected to the rear end of the BOG compressor 32 of the second fuel supply line L2 is provided at the merging line L4, and the second engine E2 through the merging line L4. ) includes a pressure reducing valve 70 for reducing the pressure of the fuel gas supplied to the.

이하, 연료가스 공급시스템(100)의 각 구성에 대해서 설명한다.Hereinafter, each configuration of the fuel gas supply system 100 will be described.

저장탱크(10)는 예컨대 LNG(Liquefied Natural Gas)를 저장할 수 있으며, 다른 예에서는 제1 및 제2엔진(E1,E2)의 연료로 사용되며, 액화 가능한 다른 물질을 저장할 수도 있다. 저장탱크(10)는 단열상태를 유지하면서 연료를 액화상태로 저장하는 멤브레인형 탱크, SPB형 탱크 등을 포함할 수 있다. The storage tank 10 may store, for example, LNG (Liquefied Natural Gas), and in another example, it is used as a fuel for the first and second engines E1 and E2, and may store other liquefiable materials. The storage tank 10 may include a membrane type tank, an SPB type tank, and the like for storing fuel in a liquefied state while maintaining a thermal insulation state.

제1엔진(E1)은 예컨대, ME-GI 엔진(Man B&W 사의 Gas Injection 엔진)과 같은 고압(약 150~400bar)의 분사엔진일 수 있다. 또, 제2엔진(E2)은 예컨대, DFDE(Dual Fuel Disel Electric) 엔진 등과 같은 저압(약 5~8bar)의 분사엔진, 중압(약 16~18bar)의 연료가스로 연소가 가능한 중압가스 분사엔진을 포함할 수 있다.The first engine E1 may be, for example, a high-pressure (about 150 to 400 bar) injection engine, such as a ME-GI engine (Man B&W's Gas Injection engine). In addition, the second engine E2 is, for example, a low pressure (about 5 to 8 bar) injection engine, such as a DFDE (Dual Fuel Disel Electric) engine, a medium pressure gas injection engine capable of combustion with fuel gas of a medium pressure (about 16 to 18 bar). may include.

저장탱크(10)로부터 공급받은 액화가스는 제1연료공급라인(L1)을 통해 제1엔진(E1)의 연료로 공급된다. The liquefied gas supplied from the storage tank 10 is supplied as a fuel of the first engine E1 through the first fuel supply line L1.

제1연료공급라인(L1)은 저장탱크(10), 고압펌프(40), 기화기(50) 및 제1엔진(E1)을 연결한다.The first fuel supply line L1 connects the storage tank 10 , the high-pressure pump 40 , the carburetor 50 and the first engine E1 .

고압펌프(40)는 저장탱크(10)로부터 공급받은 액화가스를 가압하며, 기화기(50)는 고압펌프(40)에 의해 가압된 액화가스를 기화시켜 제1엔진(E1)으로 공급한다.The high-pressure pump 40 pressurizes the liquefied gas supplied from the storage tank 10 , and the vaporizer 50 vaporizes the liquefied gas pressurized by the high-pressure pump 40 and supplies it to the first engine E1 .

이때, 제1엔진(E1)의 배기가스는 제1터빈(21)을 구동시키며, 제1터빈(21)은 제1축(X1)으로 연결된 공기압축기(31)로 회전력을 전달한다. 즉, 제1터빈(21)에 내장된 휠의 회전 토크가 축(X1)에 의해 공기압축기(31)의 휠로 전달될 수 있다.At this time, the exhaust gas of the first engine E1 drives the first turbine 21 , and the first turbine 21 transmits the rotational force to the air compressor 31 connected to the first shaft X1 . That is, the rotation torque of the wheel built in the first turbine 21 may be transmitted to the wheel of the air compressor 31 by the axis X1.

공기압축기(31)는 외부로부터 공기를 흡입 및 압축하여 제1엔진(E1)으로 공급한다. 즉, 공기압축기(31)에 내장된 휠의 회전에 의해서 유입된 공기가 압축되어 제1엔진(E1)으로 공급되며, 제1엔진(E1)의 연소 작용에 사용될 수 있다.The air compressor 31 sucks and compresses air from the outside and supplies it to the first engine E1. That is, the air introduced by the rotation of the wheel built into the air compressor 31 is compressed and supplied to the first engine E1 , and may be used for the combustion action of the first engine E1 .

공기압축기(31)와 제1엔진(E1)은 에어라인(L11)으로 연결되며, 제1엔진(E1)과 제1터빈(21)은 제1배기가스라인(L12)으로 연결된다.The air compressor 31 and the first engine E1 are connected through an air line L11 , and the first engine E1 and the first turbine 21 are connected through a first exhaust gas line L12 .

그리고, 제2배기가스라인(L13)은 제1배기가스라인(L12)의 제1터빈(21) 전단으로부터 분기되어 제2터빈(22)과 제1배기가스라인(L12)의 제1터빈(21) 후단을 연결한다.In addition, the second exhaust gas line L13 is branched from the front end of the first turbine 21 of the first exhaust gas line L12 to the second turbine 22 and the first turbine (L12) of the first exhaust gas line L12. 21) Connect the rear end.

여기서, 제2터빈(22)은 제1터빈(21)으로 공급되는 배기가스 중 일부를 제2배기가스라인(L13)을 통해 공급받아 구동된다.Here, the second turbine 22 is driven by receiving a portion of the exhaust gas supplied to the first turbine 21 through the second exhaust gas line L13 .

증발가스압축기(32)는 이러한 제2터빈(22)과 제2축(X2)으로 연결되며, 제2터빈(22)에 의해 구동된다. 이때, 증발가스압축기(32)는 저장탱크(10)로부터 공급받은 증발가스를 압축하여 제2엔진(E2)의 연료로 공급한다.The boil-off gas compressor 32 is connected to the second turbine 22 and the second shaft X2 and is driven by the second turbine 22 . At this time, the boil-off gas compressor 32 compresses the boil-off gas supplied from the storage tank 10 and supplies it as fuel of the second engine E2.

종래에는 저장탱크의 액화가스를 가압 및 기화시켜 고압가스분사엔진으로 공급하고, 그 중 일부를 감압밸브에 의해 감압시켜 중압 또는 저압가스분사엔진으로 공급한다. 이는 시스템 효율을 떨어뜨리고, 에너지 낭비를 가져올 수 있다. Conventionally, the liquefied gas in the storage tank is pressurized and vaporized to be supplied to the high-pressure gas injection engine, and a portion thereof is reduced by a pressure reducing valve and supplied to the medium pressure or low pressure gas injection engine. This may reduce system efficiency and result in energy wastage.

그러나, 본 발명은 제1터빈(21)으로 공급되는 배기가스 중 일부를 별도로 마련된 제2터빈(22) 구동에 이용하고, 제2터빈(22)에 의해 증발가스압축기(32)를 구동시켜 이를 통해 저장탱크(10)로부터 공급받은 증발가스를 압축하여 제2엔진(E2)의 연료로 공급함으로써, 시스템 효율성을 향상시킬 수 있다.However, in the present invention, some of the exhaust gas supplied to the first turbine 21 is used for driving the separately provided second turbine 22 , and the BOG compressor 32 is driven by the second turbine 22 to By compressing the boil-off gas supplied from the storage tank 10 through and supplying it as fuel of the second engine E2, system efficiency can be improved.

한편, 제1엔진(E1) 및 제2엔진(E2)에 필요한 연료가스는 분기라인(L3)을 통해 보충될 수 있다.On the other hand, the fuel gas required for the first engine (E1) and the second engine (E2) may be replenished through the branch line (L3).

분기라인(L3)은 제2연료공급라인(L2)로부터 분기되어, 저장탱크(10)로부터 공급받은 증발가스 중 일부를 압축부(60)를 통해 압축하고, 해당 압축된 증발가스를 제1연료공급라인(L1)의 기화기(50) 후단으로 합류시킨다.The branch line L3 is branched from the second fuel supply line L2, compresses some of the BOG supplied from the storage tank 10 through the compression unit 60, and converts the compressed BOG into the first fuel. It merges into the rear end of the vaporizer 50 of the supply line (L1).

압축부(60)는 도시하지는 않았으나, 복수의 압축기와 냉각기를 포함할 수 있으며, 저장탱크(10)로부터 공급받은 액화가스의 증발가스를 설정된 압력에 따라 압축시킨다.Although not shown, the compression unit 60 may include a plurality of compressors and a cooler, and compresses the boil-off gas of the liquefied gas supplied from the storage tank 10 according to a set pressure.

또, 합류라인(L4)은 제1연료공급라인(L1)의 합류된 지점 후단으로부터 분기되어 제2연료공급라인(L2)의 증발가스압축기(32) 후단과 연결된다. 합류라인(L4)에 마련된 감압밸브(70)는 제2엔진(E2)의 연료가스공급조건에 맞게 합류라인(L4)을 통해 제2엔진(E2)으로 공급되는 연료가스를 감압시킨다.In addition, the merging line (L4) is branched from the rear end of the merging point of the first fuel supply line (L1) and is connected to the rear end of the BOG compressor (32) of the second fuel supply line (L2). The pressure reducing valve 70 provided in the merging line L4 reduces the fuel gas supplied to the second engine E2 through the merging line L4 in accordance with the fuel gas supply conditions of the second engine E2.

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

10: 저장탱크 21,22: 터빈
31: 공기압축기 32: 증발가스압축기
40: 고압펌프 50: 기화기
60: 압축부 70: 감압밸브
E1,E2: 엔진 L1: 제1연료공급라인
L2: 제2연료공급라인 L3: 분기라인
L4: 합류라인 L11: 에어라인
L12: 제1배기가스라인 L13: 제2배기가스라인10: storage tanks 21, 22: turbine
31: air compressor 32: boil-off gas compressor
40: high pressure pump 50: carburetor
60: compression unit 70: pressure reducing valve
E1, E2: Engine L1: First fuel supply line
L2: Second fuel supply line L3: Branch line
L4: merging line L11: air line
L12: first exhaust gas line L13: second exhaust gas line

Claims (5)

액화가스 및 상기 액화가스의 증발가스를 저장하는 저장탱크;
제1엔진에서 방출하는 배기가스에 의해 구동하는 제1터빈;
상기 제1터빈으로 공급되는 상기 배기가스 중 일부를 공급받아 구동하는 제2터빈;
상기 제2터빈과 동일 축으로 연결되며, 상기 제2터빈에 의해 구동되는 증발가스압축기;
상기 제1터빈과 동일 축으로 연결되며, 상기 제1터빈에 의해 구동되는 공기압축기;
상기 공기압축기와 상기 제1엔진을 연결하는 에어라인;
상기 제1엔진과 상기 제1터빈을 연결하는 제1배기가스라인; 및
상기 제1배기가스라인의 상기 제1터빈 전단으로부터 분기되어 상기 제2터빈과 상기 제1배기가스라인의 상기 제1터빈 후단을 연결하는 제2배기가스라인;을 포함하되,
상기 증발가스압축기는 상기 저장탱크로부터 공급받은 증발가스를 압축하여 제2엔진의 연료로 공급하고,
상기 공기압축기는 외부로부터 공기를 흡입 및 압축하여 상기 제1엔진으로 공급하는 연료가스 공급시스템.a storage tank for storing liquefied gas and boil-off gas of the liquefied gas;
a first turbine driven by exhaust gas emitted from the first engine;
a second turbine for receiving and driving a portion of the exhaust gas supplied to the first turbine;
a boil-off gas compressor connected to the second turbine on the same axis and driven by the second turbine;
an air compressor coaxially connected to the first turbine and driven by the first turbine;
an air line connecting the air compressor and the first engine;
a first exhaust gas line connecting the first engine and the first turbine; and
a second exhaust gas line branching from the front end of the first turbine of the first exhaust gas line and connecting the second turbine and the rear end of the first turbine of the first exhaust gas line;
The boil-off gas compressor compresses the boil-off gas supplied from the storage tank and supplies it as fuel of a second engine,
The air compressor is a fuel gas supply system for supplying air to the first engine by sucking and compressing air from the outside. 삭제delete 삭제delete 삭제delete 삭제delete
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