KR20200130779A - Fuel gas supply system - Google Patents

Fuel gas supply system Download PDF

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Publication number
KR20200130779A
KR20200130779A KR1020190054979A KR20190054979A KR20200130779A KR 20200130779 A KR20200130779 A KR 20200130779A KR 1020190054979 A KR1020190054979 A KR 1020190054979A KR 20190054979 A KR20190054979 A KR 20190054979A KR 20200130779 A KR20200130779 A KR 20200130779A
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South Korea
Prior art keywords
compression unit
fuel
unit
gas
heat exchange
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KR1020190054979A
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Korean (ko)
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최병윤
정승재
이호기
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삼성중공업 주식회사
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Priority to KR1020190054979A priority Critical patent/KR20200130779A/en
Publication of KR20200130779A publication Critical patent/KR20200130779A/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 
    • 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
    • F02M21/0215—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
    • F02M21/0245—High pressure fuel supply systems; Rails; Pumps; Arrangement of valves
    • 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
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • 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
    • 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
    • F17C2227/0337—Heat exchange with the fluid by cooling
    • F17C2227/0339—Heat exchange with the fluid by cooling using the same 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
    • 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
    • F17C2265/03—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
    • F17C2265/03—Treating the boil-off
    • F17C2265/032—Treating the boil-off by recovery
    • F17C2265/037—Treating the boil-off by recovery with pressurising
    • 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
    • F17C2265/038—Treating the boil-off by recovery with expanding
    • 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

Abstract

Disclosed is a fuel gas supply system. According to one embodiment of the present invention, the fuel gas supply system comprises: a heat exchange unit for receiving evaporated gas of liquefied gas from a storage tank, and performing heat exchange; a fuel compression unit for compressing heat-exchanged evaporated gas in accordance with the required pressure of a demand source; a re-liquefying unit for re-liquefying at least a portion of the compressed evaporated gas; and a fuel supply line for connecting the storage tank, the heat exchange unit, the fuel compression unit, and the demand source. The re-liquefying unit of the present invention comprises: a rear end compression unit for compressing evaporated gas passing through the fuel compression unit; and an expander for expanding the compressed evaporated gas in which the temperature is lowered by exchanging heat with the evaporated gas supplied from the storage tank by the heat exchange unit after passing through the rear end compression unit. A re-liquefying line branched from the rear end of the fuel compression unit of the fuel supply line, and connecting the rear end compression unit, the heat exchange unit, the expander, and the storage tank is provided. According to the present invention, power consumed during re-liquefaction of evacuated gas can be minimized.

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)의 규제가 강화됨에 따라 조선 및 해운업계에서는 기존 연료인 중유, 디젤유의 이용을 대신하여, 청정 에너지원인 천연가스를 선박의 연료가스로 이용하는 경우가 많아지고 있다.As the regulations of the International Maritime Organization (IMO) on the emission of greenhouse gases and various air pollutants are strengthened, the shipbuilding and shipping industries use natural gas, a clean energy source, instead of the existing fuel oil and diesel oil. It is increasingly used as.

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

액화가스를 운반하는 선박은 액화가스를 저장할 수 있도록 단열 처리된 저장탱크를 구비한다. 또, 선박은 저장탱크에서 발생하는 증발가스(Boiled Off Gas)를 압축시켜 엔진의 연료로 공급하는 연료가스 공급시스템을 마련할 수 있다. 선박의 엔진에는 DFDE(Dual Fuel Disel Electric) 엔진 등과 같은 저압(약 5~8bar)의 분사엔진, ME-GI 엔진(Man B&W 사의 Gas Injection 엔진)과 같은 고압(약 150~700bar)의 분사엔진 및 중압(약 16~18bar)의 연료가스로 연소가 가능한 중압가스 분사엔진이 포함될 수 있다.A ship carrying liquefied gas has a storage tank that is insulated to store liquefied gas. In addition, the ship may provide a fuel gas supply system that compresses boiled off gas generated from the storage tank and supplies it as fuel of the engine. Ship engines include low-pressure (approximately 5-8 bar) injection engines such as DFDE (Dual Fuel Disel Electric) engines, and high-pressure (approximately 150-700 bar) injection engines such as ME-GI engines (Man B&W's Gas Injection engine). A medium pressure gas injection engine capable of combustion with medium pressure (about 16 to 18 bar) fuel gas may be included.

상술한 연료가스 공급시스템은 저장탱크로부터 공급된 증발가스를 압축부에 의해 압축시켜 엔진의 연료로 공급할 수 있다. 이때, 해당 엔진이 필요로 하는 연료 소모량보다 많은 증발가스가 공급된 경우, 잉여분의 증발가스는 열교환부에 의해 저장탱크로부터 공급된 증발가스와 열교환되어 액화된 후, 기액분리기로 공급되고, 기액분리기에 의해 분리된 액체 성분은 저장탱크에 다시 저장된다.The above-described fuel gas supply system can compress the boil-off gas supplied from the storage tank by the compression unit and supply it as fuel of the engine. At this time, if more evaporative gas than the fuel consumption required by the engine is supplied, the excess evaporated gas is heat-exchanged with the evaporated gas supplied from the storage tank by the heat exchanger to be liquefied, and then supplied to the gas-liquid separator. The liquid component separated by is stored again in the storage tank.

그러나 종래의 연료가스 공급시스템은 엔진이 필요로 하는 연료공급량과 관계없이 압축부가 운용되고, 증발가스 재액화 시에도 재액화량과 관계없이 압축부에 의해 압축된 증발가스에 대한 재액화가 이루어지므로, 전력 소모량이 많은 비효율적인 면이 있다.However, in the conventional fuel gas supply system, the compression unit is operated regardless of the amount of fuel supplied by the engine, and even when the boil-off gas is re-liquefied, the boil-off gas compressed by the compression unit is reliquefied regardless of the amount of re-liquefaction. There is an inefficiency that consumes a lot of power.

이와 관련된 기술로서 한국공개특허 제10-2014-0052898호(2014.05.07. 공개)를 참조하기 바란다.As a related technology, please refer to Korean Patent Publication No. 10-2014-0052898 (published on May 7, 2014).

한국공개특허 제10-2014-0052898호(2014.05.07. 공개)Korean Patent Publication No. 10-2014-0052898 (published on May 7, 2014)

본 발명의 실시 예는 엔진이 필요로 하는 연료공급량에 따라 압축부를 선택적으로 운용하고, 증발가스 재액화 시 소모되는 전력을 최소화할 수 있는 연료가스 공급시스템을 제공하고자 한다.An embodiment of the present invention is to provide a fuel gas supply system capable of selectively operating a compression unit according to a fuel supply amount required by an engine and minimizing power consumed when re-liquefying boil-off gas.

본 발명의 일 측면에 따르면, 저장탱크로부터 액화가스의 증발가스를 공급받아 열교환시키는 열교환부; 상기 열교환된 증발가스를 수요처의 요구압력에 따라 압축시키는 연료압축부; 상기 압축된 증발가스 중 적어도 일부를 재액화하는 재액화부; 및 상기 저장탱크, 열교환부, 연료압축부 및 수요처를 연결하는 연료공급라인; 을 포함하되, 상기 재액화부는 상기 연료압축부를 통과한 증발가스를 압축시키는 후단압축부와, 상기 후단압축부를 통과한 후, 상기 열교환부에 의해 상기 저장탱크로부터 공급된 증발가스와 열교환되어 온도가 낮아진 상기 압축된 증발가스를 팽창시키는 팽창기를 포함하고, 상기 연료공급라인의 상기 연료압축부 후단으로부터 분기되어, 상기 후단압축부, 열교환부, 팽창기 및 저장탱크를 연결하는 재액화라인을 마련한 연료가스 공급시스템이 제공될 수 있다.According to an aspect of the present invention, there is provided a heat exchange unit for receiving boil-off gas of liquefied gas from a storage tank for heat exchange; A fuel compression unit compressing the heat-exchanged boil-off gas according to a pressure required by a customer; A reliquefaction unit reliquefying at least a portion of the compressed boil-off gas; And a fuel supply line connecting the storage tank, the heat exchange unit, the fuel compression unit and the customer. Including, wherein the re-liquefaction unit is a rear stage compression unit for compressing the boil-off gas that has passed through the fuel compression unit, and after passing through the rear stage compression unit, heat exchange with the boil-off gas supplied from the storage tank by the heat exchange unit is Fuel gas comprising an expander for expanding the lowered compressed boil-off gas, branching from the rear end of the fuel compression unit of the fuel supply line, and providing a reliquefaction line connecting the rear compression unit, heat exchange unit, expander and storage tank A supply system can be provided.

상기 재액화부는 상기 연료공급라인의 상기 열교환부와 상기 연료압축부 사이에 마련되며, 설정 압력에 따라 상기 열교환부를 통과한 상기 저장탱크로부터 공급된 증발가스를 압축시켜 상기 연료압축부로 보내는 전단압축부를 더 포함하고, 상기 전단압축부 및 상기 후단압축부는 상기 팽창기로부터 회전력을 전달받아 구동될 수 있다.The reliquefaction unit is provided between the heat exchange unit and the fuel compression unit of the fuel supply line, and compresses the boil-off gas supplied from the storage tank that has passed through the heat exchange unit according to a set pressure and sends it to the fuel compression unit. Further, the front compression unit and the rear compression unit may be driven by receiving rotational force from the expander.

상기 연료공급라인의 상기 열교환부 전단으로부터 분기되어 상기 전단압축부와 상기 연료압축부 사이로 연결되며, 상기 재액화부에 의한 재액화를 수행하지 않을 경우, 상기 전단압축부를 통과하지 않고 상기 저장탱크로부터 공급된 증발가스를 바로 상기 연료압축부로 공급하는 바이패스라인을 더 포함할 수 있다.Branched from the front end of the heat exchange unit of the fuel supply line and connected between the front end compression unit and the fuel compression unit, and when the reliquefaction by the reliquefaction unit is not performed, supply from the storage tank without passing through the shear compression unit It may further include a bypass line for directly supplying the evaporated gas to the fuel compression unit.

상기 연료압축부는 서로 병렬 연결된 제1압축부 및 제2압축부를 포함하고, 상기 수요처에서 필요로 하는 연료공급량에 따라 상기 제1압축부 및 제2압축부 중 하나 이상이 동작할 수 있다.The fuel compression unit includes a first compression unit and a second compression unit connected in parallel with each other, and at least one of the first compression unit and the second compression unit may operate according to the amount of fuel supplied by the customer.

본 발명의 실시 예에 따른 연료가스 공급시스템은 엔진이 필요로 하는 연료공급량에 따라 압축부를 선택적으로 운용하고, 증발가스 재액화 시 소모되는 전력을 최소화할 수 있다.The fuel gas supply system according to an exemplary embodiment of the present invention may selectively operate a compression unit according to a fuel supply amount required by the engine, and minimize power consumed when re-liquefied boil-off gas.

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

도 1은 본 발명의 일 실시 예에 따른 연료가스 공급시스템을 도시한다.
도 2는 본 발명의 다른 실시 예에 따른 연료가스 공급시스템을 도시한다.1 shows a fuel gas supply system according to an embodiment of the present invention.
2 shows a fuel gas supply system according to another embodiment of the present invention.

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

도 1은 본 발명의 일 실시 예에 따른 연료가스 공급시스템을 도시한다.1 shows a fuel gas supply system according to an embodiment of the present invention.

도 1을 참조하면, 본 발명의 일 실시 예에 따른 연료가스 공급시스템(100)은 저장탱크(101)로부터 액화가스의 증발가스를 공급받아 열교환시키는 열교환부(110)와, 열교환부(110)에 의해 열교환된 증발가스를 수요처(E)의 요구압력에 따라 압축시키는 연료압축부(120)와, 연료압축부(120)에 의해 압축된 증발가스 중 적어도 일부를 재액화하는 재액화부(130)와, 저장탱크(101), 열교환부(110), 연료압축부(120) 및 수요처(E)를 연결하는 연료공급라인(L1)을 포함한다.Referring to FIG. 1, a fuel gas supply system 100 according to an embodiment of the present invention includes a heat exchange unit 110 for receiving and heat exchange of boil-off gas of liquefied gas from a storage tank 101, and a heat exchange unit 110. A fuel compression unit 120 that compresses the boil-off gas heat-exchanged according to the required pressure of the customer E, and a re-liquefaction unit 130 that reliquefies at least a portion of the boil-off gas compressed by the fuel compression unit 120 And, it includes a fuel supply line (L1) connecting the storage tank 101, the heat exchange unit 110, the fuel compression unit 120 and the customer E.

여기서, 재액화부(130)는 연료압축부(120)를 통과한 증발가스를 압축시키는 후단압축부(132)와, 후단압축부(132)를 통과한 후 열교환부(110)에 의해 저장탱크(101)로부터 공급된 증발가스와 열교환되어 온도가 낮아진 상기 압축된 증발가스를 팽창시키는 팽창기(134, expander)를 포함할 수 있다.Here, the reliquefaction unit 130 includes a rear compression unit 132 for compressing the boil-off gas that has passed through the fuel compression unit 120, and a storage tank by the heat exchange unit 110 after passing through the rear compression unit 132. It may include an expander 134 for expanding the compressed boil-off gas whose temperature is lowered by heat exchange with the boil-off gas supplied from 101).

후단압축부(132), 열교환부(110), 팽창기(136) 및 저장탱크(101)는 연료압축부(120) 후단으로부터 분기된 재액화라인(L2)에 의해 연결된다.The rear compression unit 132, the heat exchange unit 110, the expander 136, and the storage tank 101 are connected by a reliquefaction line L2 branched from the rear end of the fuel compression unit 120.

이러한 연료가스 공급시스템(100)은 각종 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 선박에 적용될 수 있다. These fuel gas supply systems 100 include various liquefied fuel carriers, liquefied fuel RV (Regasification Vessel), container ships, commercial ships, LNG FPSO (Floating, Production, Storage and Off-loading), LNG FSRU (Floating Storage and Regasification Unit). ), etc. can be applied to ships.

이하, 각 구성요소에 대해서 구체적으로 설명한다.Hereinafter, each component will be described in detail.

저장탱크(101)에 저장된 액화가스는 액화상태로 저장할 수 있는 LNG(Liquefied Natural Gas), LPG(Liquefied Petroleum Gas), DME(Dimethylether), 에탄(Ethane) 중 어느 하나일 수 있으나 이에 한정되는 것은 아니다. 저장탱크(101)는 단열상태를 유지하면서 연료를 액화상태로 저장하는 멤브레인형 탱크, SPB형 탱크 등을 포함할 수 있다. 저장탱크(101) 내부압력은 저장하는 액화가스가 LNG일 경우 1bar로 유지되거나 연료공급조건을 고려해 그보다 높은 압력으로 유지될 수 있다. 저장탱크(101) 내부온도는 예컨대 LNG의 액화상태 유지를 위해 ―163℃도 정도로 유지될 수 있다. 저장탱크(101)에 액화가스의 증발가스는 연료공급라인(L1)을 통해 수요처(E) 쪽으로 공급될 수 있다. 수요처(E)는 예컨대 가스 엔진(gas engine), 가스 제너레이터(gas generator) 등을 포함할 수 있다.The liquefied gas stored in the storage tank 101 may be any one of LNG (Liquefied Natural Gas), LPG (Liquefied Petroleum Gas), DME (Dimethylether), and Ethane, which can be stored in a liquefied state, but is not limited thereto. . The storage tank 101 may include a membrane-type tank, an SPB-type tank, or the like for storing fuel in a liquefied state while maintaining an adiabatic state. The internal pressure of the storage tank 101 may be maintained at 1 bar when the liquefied gas to be stored is LNG, or may be maintained at a higher pressure in consideration of fuel supply conditions. The internal temperature of the storage tank 101 may be maintained at about -163°C to maintain the liquefied state of LNG. The boil-off gas of the liquefied gas to the storage tank 101 may be supplied to the consumer E through the fuel supply line L1. The consumer E may include, for example, a gas engine, a gas generator, or the like.

열교환부(110)는 저장탱크(101)로부터 공급된 액화가스의 증발가스를 후단압축부(132)를 거쳐 압축된 증발가스와 열교환시킨다. 저장탱크(101)로부터 공급된 액화가스의 증발가스는 열교환부(110)를 거쳐 온도가 높아진 상태에서 연료압축부(120)로 공급되고, 후단압축부(132)를 거쳐 압축된 증발가스는 열교환부(110)를 거쳐 온도가 낮아진 상태에서 팽창기(136)로 공급된다.The heat exchange unit 110 heat-exchanges the boil-off gas of the liquefied gas supplied from the storage tank 101 with the compressed boil-off gas through the downstream compression unit 132. The boil-off gas of the liquefied gas supplied from the storage tank 101 is supplied to the fuel compression unit 120 at a high temperature through the heat exchange unit 110, and the boil-off gas compressed through the rear compression unit 132 is heat-exchanged. It is supplied to the expander 136 in a state in which the temperature is lowered through the unit 110.

연료압축부(120)는 서로 병렬 연결된 제1압축부(122) 및 제2압축부(124)를 포함할 수 있다. 이때, 수요처(E)에서 필요로 하는 연료공급량에 따라 제1압축부(122) 및 제2압축부(124) 중 하나 이상이 동작된다. 예컨대 제1압축부(122) 및 제2압축부(124)는 운용방식에 따라 각각 50 대 50 비율로 수요처(E)로 공급될 연료를 압축 처리할 수 있다.The fuel compression unit 120 may include a first compression unit 122 and a second compression unit 124 connected in parallel with each other. At this time, at least one of the first compression unit 122 and the second compression unit 124 is operated according to the amount of fuel supplied by the customer E. For example, the first compression unit 122 and the second compression unit 124 may compress and process fuel to be supplied to the consumer E at a ratio of 50 to 50, respectively, according to an operation method.

제1압축부(122) 및 제2압축부(124)는 각각 압축기(122a,124a)와 냉각기(122b,124b)가 교대로 배치된 다단 압축방식을 사용할 수 있다. 본 발명의 실시 예에서는 제1압축부(122) 및 제2압축부(124)의 압축기 및 냉각기가 2단으로 교대로 배치된 것을 예로 들었으나, 다른 예에서는 그 이상으로 구성될 수 있다.The first compression unit 122 and the second compression unit 124 may use a multistage compression method in which compressors 122a and 124a and coolers 122b and 124b are alternately arranged. In the exemplary embodiment of the present invention, the compressor and the cooler of the first compression unit 122 and the second compression unit 124 are alternately arranged in two stages, but in other examples, the configuration may be more than that.

그리고, 제1압축부(122) 및 제2압축부(124)는 각각 저압 컴프레서(low pressure compressor)로서 동작할 수 있다.In addition, the first compression unit 122 and the second compression unit 124 may each operate as a low pressure compressor.

또, 본 발명의 실시 예에서는 서로 병렬로 연결된 두 개의 제1압축부(122) 및 제2압축부(124)를 예로 들어 설명하지만, 다른 예에서는 세 개 이상의 압축부가 서로 병렬로 연결될 수 있다. In addition, in an embodiment of the present invention, two first compression units 122 and second compression units 124 connected in parallel are described as an example, but in other examples, three or more compression units may be connected in parallel with each other.

이와 같이 복수의 압축부를 병렬 연결함으로써, 수요처(E)에서 필요로 하는 연료공급량에 따라 압축부 중 선택적으로 하나 이상을 구동시킬 수 있어, 시스템 운용 효율을 높일 수 있다.By connecting a plurality of compression units in parallel as described above, it is possible to selectively drive one or more of the compression units according to the amount of fuel supply required by the consumer E, thereby improving system operation efficiency.

한편, 수요처(E)가 필요로 하는 연료공급량에 비해 많은 양의 연료가 공급된 경우, 재액화라인(L2) 상의 개폐밸브(V1)를 개방시켜, 수요처(E)이 필요로 하는 연료공급량을 제외한 증발가스를 재액화부(130) 쪽으로 보낼 수 있다.On the other hand, when a large amount of fuel is supplied compared to the fuel supply amount required by the customer E, the opening/closing valve V1 on the reliquefaction line L2 is opened, so that the fuel supply amount required by the customer E is adjusted. Excluded boil-off gas can be sent to the re-liquefaction unit 130.

재액화부(130)의 후단압축부(132)는 연료압축부(120)를 거친 압축된 증발가스를 설정된 압력에 따라 압축시켜 열교환부(110)로 보낸다.The downstream compression unit 132 of the reliquefaction unit 130 compresses the compressed boil-off gas that has passed through the fuel compression unit 120 according to a set pressure and sends it to the heat exchange unit 110.

후단압축부(132)는 압축기(132a)와 냉각기(132b)가 교대로 배치된 다단 압축방식을 사용할 수 있다. 본 발명의 실시 예에서는 후단압축부(132)의 압축기(132a) 및 냉각기(132b)가 2단으로 교대로 배치된 것을 예로 들었으나, 다른 예에서는 그 이상으로 구성될 수 있다.The rear compression unit 132 may use a multistage compression method in which the compressors 132a and the coolers 132b are alternately arranged. In the exemplary embodiment of the present invention, the compressor 132a and the cooler 132b of the rear-stage compression unit 132 are alternately arranged in two stages, but in other examples, the configuration may be higher.

그리고, 후단압축부(132)는 고압 부스터 컴프레서(high pressure booster compressor)로서 동작할 수 있다.In addition, the rear compression unit 132 may operate as a high pressure booster compressor.

이러한 후단압축부(132)는 팽창기(136)로부터 회전력을 전달받아 구동된다. 이를 위해 후단압축부(132)에 포함된 압축기는 팽창기(136)의 회전축(미도시)과 연결되어 팽창기(136)로부터 회전력을 전달받아 구동될 수 있다.This rear compression part 132 is driven by receiving a rotational force from the expander 136. To this end, the compressor included in the rear compression unit 132 may be connected to a rotation shaft (not shown) of the expander 136 and may be driven by receiving a rotational force from the expander 136.

팽창기(136)는 후단압축부(132)를 통과한 후 열교환부(110)를 거쳐 온도가 낮아진 유체를 팽창시킨다. The expander 136 expands the fluid whose temperature has been lowered through the heat exchanger 110 after passing through the rear compression unit 132.

이와 같이, 팽창기(136)에서 얻어지는 에너지를 최대한 활용하여 후단압축부(132)를 구동시킴으로써, 시스템의 운용 효율을 높일 수 있다.In this way, by maximizing the energy obtained from the expander 136 and driving the rear stage compression unit 132, it is possible to increase the operating efficiency of the system.

팽창기(136)를 통과한 유체는 기액분리기(140)에서 액체 및 기체로 분리되며, 액체 성분은 저장탱크(101)에 저장되고, 기체성분은 합류라인(L4)을 통해 저장탱크(101)로부터 공급된 증발가스에 합류되어 열교환부(110)로 공급될 수 있다.The fluid that has passed through the expander 136 is separated into liquid and gas in the gas-liquid separator 140, the liquid component is stored in the storage tank 101, and the gas component is from the storage tank 101 through the confluence line (L4). It may be joined to the supplied boil-off gas and supplied to the heat exchange unit 110.

도 2는 본 발명의 다른 실시 예에 따른 연료가스 공급시스템을 도시한다. 이하에서는 상술한 도 1의 내용과 중복된 내용은 되도록 생략한다.2 shows a fuel gas supply system according to another embodiment of the present invention. Hereinafter, contents overlapping with the contents of FIG. 1 will be omitted.

도 2를 참조하면, 상술한 재액화부(130)는 연료공급라인(L1)의 열교환부(110)와 연료압축부(120) 사이에 마련되며, 설정 압력에 따라 열교환부(110)를 통과한 저장탱크(101)로부터 공급된 증발가스를 압축시켜 연료압축부(120)로 보내는 전단압축부(134)를 더 포함할 수 있다.Referring to FIG. 2, the above-described reliquefaction unit 130 is provided between the heat exchange unit 110 and the fuel compression unit 120 of the fuel supply line L1, and passes through the heat exchange unit 110 according to a set pressure. It may further include a pre-compression unit 134 for compressing the boil-off gas supplied from the storage tank 101 and sending it to the fuel compression unit 120.

전단압축부(134)는 압축기(134a)와 냉각기(134b)가 교대로 배치된 다단 압축방식을 사용할 수 있다. 전단압축부(134)는 저압 부스터 컴프레서(low pressure booster compressor)로서 동작할 수 있다.The shear compression unit 134 may use a multi-stage compression method in which the compressor 134a and the cooler 134b are alternately arranged. The shear compression unit 134 may operate as a low pressure booster compressor.

이때, 상술한 후단압축부(132)와 전단압축부(134)는 팽창기(136)의 팽창 에너지에 의해 구동된다. 즉, 팽창기(136)의 회전축은 후단압축부(132) 및 전단압축부(134)에 포함된 압축기와 연결되고, 후단압축부(132)와 전단압축부(134)는 팽창기(136)로부터 회전력을 전달받아 구동될 수 있다. 이와 같이, 팽창기(136)에서 얻어지는 에너지를 최대한 활용하여 시스템의 운용 효율을 높일 수 있다.At this time, the above-described rear compression unit 132 and the front compression unit 134 are driven by the expansion energy of the expander 136. That is, the rotary shaft of the expander 136 is connected to the compressor included in the rear compression unit 132 and the front compression unit 134, and the rear compression unit 132 and the front compression unit 134 are rotated from the expander 136 It can be driven by receiving. In this way, the energy obtained from the expander 136 can be maximized to increase the operating efficiency of the system.

전단압축부(134)에 의해 압축된 증발가스는 수요처(E)의 연료공급조건에 맞게 연료압축부(120)를 통해 더 높은 압력으로 압축될 수 있다. 그리고, 재액화라인(L2) 쪽으로 공급되는 증발가스는 전단압축부(134) 및 연료압축부(120)를 통해 압력이 높아진 상태이므로, 후단압축부(132)의 소형화가 가능하다. 이를 통해 비용을 절감하는 동시에 효율적인 시스템 운영이 가능하다.The boil-off gas compressed by the shear compression unit 134 may be compressed at a higher pressure through the fuel compression unit 120 according to the fuel supply condition of the customer E. In addition, since the pressure of the boil-off gas supplied to the reliquefaction line L2 is increased through the front-end compression unit 134 and the fuel compression unit 120, the rear-stage compression unit 132 can be miniaturized. This enables efficient system operation while reducing cost.

한편, 연료가스 공급시스템(100)은 연료공급라인(L1)의 열교환부(110) 전단으로부터 분기되어 전단압축부(134)와 연료압축부(120) 사이로 연결되며, 재액화부(130)에 의한 재액화를 수행하지 않을 경우, 전단압축부(134)를 통과하지 않고, 연료압축부(120)로 저장탱크(101)로부터 공급된 증발가스를 바로 공급하는 바이패스라인(L3)을 포함할 수 있다.On the other hand, the fuel gas supply system 100 is branched from the front end of the heat exchange unit 110 of the fuel supply line L1 and is connected between the front end compression unit 134 and the fuel compression unit 120, by the reliquefaction unit 130. When reliquefaction is not performed, a bypass line (L3) for directly supplying the boil-off gas supplied from the storage tank 101 to the fuel compression unit 120 may be included without passing through the shear compression unit 134. have.

즉, 재액화를 수행하지 않을 경우, 연료공급라인(L1)의 전단압축부(134) 후단에 마련된 개폐밸브(V2) 및 재액화라인(L2)의 후단압축부(132) 전단에 마련된 개폐밸브(V1)가 닫힌다. 그리고, 저장탱크(101)의 증발가스는 바이패스라인(L3)을 통해 연료압축부(120)로 공급되어 수요처(E)의 연료공급조건에 맞게 온도, 압력이 변화될 수 있다. 이러한 구성을 통해 불필요한 장치의 운용을 통한 에너지 낭비를 막을 수 있고, 전체 시스템의 효율성을 향상시킬 수 있다.That is, when reliquefaction is not performed, an on/off valve V2 provided at the rear end of the front compression unit 134 of the fuel supply line L1 and an on/off valve provided at the front end of the rear compression unit 132 of the reliquefaction line L2 (V1) is closed. In addition, the boil-off gas of the storage tank 101 is supplied to the fuel compression unit 120 through the bypass line L3, so that the temperature and pressure may be changed according to the fuel supply condition of the customer E. Through this configuration, it is possible to prevent waste of energy through operation of unnecessary devices, and improve the efficiency of the entire system.

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

101: 저장탱크 110: 열교환부
120: 연료압축부 130: 재액화부
132: 후단압축부 134: 전단압축부
136: 팽창기 140: 기액분리기
L1: 연료공급라인 L2: 재액화라인
L3: 바이패스라인101: storage tank 110: heat exchange unit
120: fuel compression unit 130: reliquefaction unit
132: rear compression unit 134: shear compression unit
136: expander 140: gas-liquid separator
L1: fuel supply line L2: reliquefaction line
L3: Bypass line

Claims (4)

저장탱크로부터 액화가스의 증발가스를 공급받아 열교환시키는 열교환부;
상기 열교환된 증발가스를 수요처의 요구압력에 따라 압축시키는 연료압축부;
상기 압축된 증발가스 중 적어도 일부를 재액화하는 재액화부; 및
상기 저장탱크, 열교환부, 연료압축부 및 수요처를 연결하는 연료공급라인; 을 포함하되,
상기 재액화부는
상기 연료압축부를 통과한 증발가스를 압축시키는 후단압축부와,
상기 후단압축부를 통과한 후, 상기 열교환부에 의해 상기 저장탱크로부터 공급된 증발가스와 열교환되어 온도가 낮아진 상기 압축된 증발가스를 팽창시키는 팽창기를 포함하고,
상기 연료공급라인의 상기 연료압축부 후단으로부터 분기되어, 상기 후단압축부, 열교환부, 팽창기 및 저장탱크를 연결하는 재액화라인을 마련한 연료가스 공급시스템.A heat exchange unit receiving boil-off gas of the liquefied gas from the storage tank for heat exchange;
A fuel compression unit compressing the heat-exchanged boil-off gas according to a pressure required by a customer;
A reliquefaction unit reliquefying at least a portion of the compressed boil-off gas; And
A fuel supply line connecting the storage tank, the heat exchange unit, the fuel compression unit and the customer; Including,
The reliquefaction unit
A post compression unit compressing the boil-off gas passing through the fuel compression unit,
After passing through the downstream compression unit, the heat exchanger includes an expander configured to expand the compressed boil-off gas whose temperature is lowered by heat exchange with the boil-off gas supplied from the storage tank,
A fuel gas supply system having a reliquefaction line branching from a rear end of the fuel compression unit of the fuel supply line and connecting the rear compression unit, a heat exchange unit, an expander and a storage tank. 제1항에 있어서,
상기 재액화부는
상기 연료공급라인의 상기 열교환부와 상기 연료압축부 사이에 마련되며, 설정 압력에 따라 상기 열교환부를 통과한 상기 저장탱크로부터 공급된 증발가스를 압축시켜 상기 연료압축부로 보내는 전단압축부를 더 포함하고,
상기 전단압축부 및 상기 후단압축부는 상기 팽창기로부터 회전력을 전달받아 구동되는 연료가스 공급시스템.The method of claim 1,
The reliquefaction unit
Further comprising a shear compression unit provided between the heat exchange unit and the fuel compression unit of the fuel supply line, compressing the boil-off gas supplied from the storage tank passing through the heat exchange unit according to a set pressure, and sending to the fuel compression unit,
The fuel gas supply system is driven by receiving a rotational force from the expander and the front compression unit and the rear compression unit. 제2항에 있어서,
상기 연료공급라인의 상기 열교환부 전단으로부터 분기되어 상기 전단압축부와 상기 연료압축부 사이로 연결되며, 상기 재액화부에 의한 재액화를 수행하지 않을 경우, 상기 전단압축부를 통과하지 않고 상기 저장탱크로부터 공급된 증발가스를 바로 상기 연료압축부로 공급하는 바이패스라인을 더 포함하는 연료가스 공급시스템.The method of claim 2,
Branched from the front end of the heat exchange unit of the fuel supply line and connected between the front end compression unit and the fuel compression unit, and when the reliquefaction by the reliquefaction unit is not performed, supply from the storage tank without passing through the shear compression unit The fuel gas supply system further comprising a bypass line for supplying the boiled gas to the fuel compression unit. 제1항에 있어서,
상기 연료압축부는
서로 병렬 연결된 제1압축부 및 제2압축부를 포함하고,
상기 수요처에서 필요로 하는 연료공급량에 따라 상기 제1압축부 및 제2압축부 중 하나 이상이 동작하는 연료가스 공급시스템.The method of claim 1,
The fuel compression unit
Including a first compression unit and a second compression unit connected in parallel to each other,
A fuel gas supply system in which at least one of the first compression unit and the second compression unit operates according to the amount of fuel supplied by the customer.
KR1020190054979A 2019-05-10 2019-05-10 Fuel gas supply system KR20200130779A (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140052898A (en) 2012-10-24 2014-05-07 대우조선해양 주식회사 System for treating a liquefied gas of a ship

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140052898A (en) 2012-10-24 2014-05-07 대우조선해양 주식회사 System for treating a liquefied gas of a ship

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