KR20170120858A - Vessel - Google Patents

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KR20170120858A
KR20170120858A KR1020160049282A KR20160049282A KR20170120858A KR 20170120858 A KR20170120858 A KR 20170120858A KR 1020160049282 A KR1020160049282 A KR 1020160049282A KR 20160049282 A KR20160049282 A KR 20160049282A KR 20170120858 A KR20170120858 A KR 20170120858A
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South Korea
Prior art keywords
gas
oil
compressor
evaporated gas
heat exchanger
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KR1020160049282A
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Korean (ko)
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KR101818523B1 (en
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이준채
정제헌
최동규
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대우조선해양 주식회사
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Priority to KR1020160049282A priority Critical patent/KR101818523B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0209—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
    • F02M21/0203—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
    • 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
    • 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
    • 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
    • F17C2227/0337—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
    • F17C2265/01—Purifying the fluid
    • F17C2265/012—Purifying the fluid by filtering
    • 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
    • F17C2265/01—Purifying the fluid
    • F17C2265/015—Purifying the fluid by separating
    • 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
    • F17C2265/01—Purifying the fluid
    • F17C2265/015—Purifying the fluid by separating
    • F17C2265/017—Purifying the fluid by separating different phases of a 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
    • F17C2265/032—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
    • 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)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (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 is a vessel having a system for reliquefying boil-off gas generated in a storage tank. The vessel comprises: a compressor compressing the boil-off gas discharged from the storage tank; an oil separator filtering oil contained in boil-off gas compressed by the compressor; a first heat exchanger heat exchanging and cooling the boil-off gas compressed by the compressor with the boil-off gas discharged from the storage tank; and a decompression device expanding boil-off gas cooled by the first heat exchanger after the boil-off gas is compressed by the compressor.

Description

선박{Vessel}Ship {Vessel}

본 발명은 선박에 관한 것으로서, 더욱 상세하게는 저장탱크 내부에서 생성되는 증발가스 중 엔진의 연료로 사용되고 남은 증발가스를 재액화시키는 시스템을 포함하는 선박에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ship, and more particularly, to a ship including a system for re-liquefying remaining evaporative gas used as fuel of an engine among evaporative gases generated in a storage tank.

근래, 액화천연가스(Liquefied Natural Gas, LNG) 등의 액화가스의 소비량이 전 세계적으로 급증하고 있는 추세이다. 가스를 저온에서 액화시킨 액화가스는 가스에 비해 부피가 매우 작아지므로 저장 및 이송 효율을 높일 수 있는 장점이 있다. 또한, 액화천연가스를 비롯한 액화가스는 액화공정 중에 대기오염 물질을 제거하거나 줄일 수 있어, 연소시 대기오염 물질 배출이 적은 친환경 연료로도 볼 수 있다. In recent years, consumption of liquefied gas such as Liquefied Natural Gas (LNG) has been rapidly increasing worldwide. The liquefied gas obtained by liquefying the gas at a low temperature has an advantage of being able to increase the storage and transport efficiency because the volume becomes very small as compared with the gas. In addition, liquefied natural gas, including liquefied natural gas, can be removed as an eco-friendly fuel with less air pollutant emissions during combustion because air pollutants can be removed or reduced during the liquefaction process.

액화천연가스는 메탄(methane)을 주성분으로 하는 천연가스를 약 -162℃로 냉각해서 액화시킴으로써 얻을 수 있는 무색투명한 액체로서, 천연가스와 비교해 약 1/600 정도의 부피를 가진다. 따라서, 천연가스를 액화시켜 이송할 경우 매우 효율적으로 이송할 수 있게 된다.Liquefied natural gas is a colorless transparent liquid obtained by cooling methane-based natural gas to about -162 ° C and liquefying it, and it has a volume of about 1/600 of that of natural gas. Therefore, when the natural gas is liquefied and transported, it can be transported very efficiently.

그러나 천연가스의 액화 온도는 상압 -162 ℃의 극저온이므로, 액화천연가스는 온도변화에 민감하여 쉽게 증발된다. 이로 인해 액화천연가스를 저장하는 저장탱크에는 단열처리를 하지만, 외부의 열이 저장탱크에 지속적으로 전달되므로 액화천연가스 수송과정에서 저장탱크 내에서는 지속적으로 액화천연가스가 자연 기화되면서 증발가스(Boil-Off Gas, BOG)가 발생한다. 이는 에탄 등 다른 저온 액화가스의 경우에도 마찬가지이다.However, since the liquefaction temperature of natural gas is a cryogenic temperature of -162 ° C at normal pressure, liquefied natural gas is sensitive to temperature changes and is easily evaporated. As a result, the storage tank storing the liquefied natural gas is subjected to heat insulation, but the external heat is continuously transferred to the storage tank. Therefore, in the transportation of liquefied natural gas, the liquefied natural gas is naturally vaporized continuously in the storage tank, -Off Gas, BOG) occurs. This also applies to other low temperature liquefied gases such as ethane.

증발가스는 일종의 손실로서 수송효율에 있어서 중요한 문제이다. 또한, 저장탱크 내에 증발가스가 축적되면 탱크 내압이 과도하게 상승할 수 있어, 심하면 탱크가 파손될 위험도 있다. 따라서, 저장탱크 내에서 발생하는 증발가스를 처리하기 위한 다양한 방법이 연구되는데, 최근에는 증발가스의 처리를 위해, 증발가스를 재액화하여 저장탱크로 복귀시키는 방법, 증발가스를 선박의 엔진 등 연료소비처의 에너지원으로 사용하는 방법 등이 사용되고 있다.Evaporation gas is a kind of loss and is an important issue in transport efficiency. Further, when the evaporation gas accumulates in the storage tank, the internal pressure of the tank may rise excessively, and there is a risk that the tank may be damaged. Accordingly, various methods for treating the evaporative gas generated in the storage tank have been studied. Recently, a method of re-liquefying the evaporated gas and returning it to the storage tank for treating the evaporated gas, a method of returning the evaporated gas to the storage tank And a method of using it as an energy source of a consuming place.

증발가스를 재액화하기 위한 방법으로는 별도의 냉매를 이용한 냉동 사이클을 구비하여 증발가스를 냉매와 열교환하여 재액화하는 방법, 및 별도의 냉매가 없이 증발가스 자체를 냉매로 하여 재액화하는 방법 등이 있다. 특히, 후자의 방법을 채용한 시스템을 부분 재액화 시스템(Partial Re-liquefaction System, PRS)이라고 한다.As a method for re-liquefying the evaporation gas, there is a method of re-liquefying the evaporation gas by heat exchange with the refrigerant by providing a refrigeration cycle using a separate refrigerant, and a method of re-liquefying the evaporation gas by using the evaporation gas itself as a refrigerant . Particularly, the system adopting the latter method is called a Partial Re-liquefaction System (PRS).

한편, 일반적으로 선박에 사용되는 엔진 중 천연가스를 연료로 사용할 수 있는 엔진으로 DFDE 및 ME-GI 엔진 등의 가스연료엔진이 있다.On the other hand, among the engines used in ships, there are gas fuel engines such as DFDE and ME-GI engines which can use natural gas as fuel.

DFDE은, 4행정으로 구성되며, 비교적 저압인 6.5bar 정도의 압력을 가지는 천연가스를 연소공기 입구에 주입하여, 피스톤이 올라가면서 압축을 시키는 오토 사이클(Otto Cycle)을 채택하고 있다.The DFDE adopts the Otto Cycle, which consists of four strokes, and injects natural gas with a relatively low pressure of about 6.5 bar into the combustion air inlet, compressing the piston as it rises.

ME-GI 엔진은, 2행정으로 구성되며, 300bar 부근의 고압 천연가스를 피스톤의 상사점 부근에서 연소실에 직접 분사하는 디젤 사이클(Diesel Cycle)을 채택하고 있다. 최근에는 연료 효율 및 추진 효율이 더 좋은 ME-GI 엔진에 대한 관심이 커지고 있는 추세이다.The ME-GI engine consists of two strokes and employs a diesel cycle in which high pressure natural gas at around 300 bar is injected directly into the combustion chamber at the top of the piston. In recent years, there is a growing interest in ME-GI engines with better fuel efficiency and propulsion efficiency.

본 발명은 압축된 증발가스에 포함되어 있는 오일을 제거한 후 증발가스를 재액화시키는 시스템을 포함하는 선박을 제공하는 것을 목적으로 한다.An object of the present invention is to provide a vessel including a system for re-liquefying the evaporated gas after removing the oil contained in the compressed evaporated gas.

상기 목적을 달성하기 위한 본 발명의 일 측면에 따르면, 저장탱크에서 발생하는 증발가스를 재액화시키는 시스템을 포함하는 선박에 있어서, 상기 저장탱크로부터 배출되는 증발가스를 압축시키는 압축기; 상기 압축기에 의해 압축된 증발가스에 포함된 오일을 걸러내는 오일분리기; 상기 압축기에 의해 압축된 증발가스를 상기 저장탱크로부터 배출되는 증발가스와 열교환시켜 냉각시키는 제1 열교환기; 및 상기 압축기에 의해 압축된 후 상기 제1 열교환기에 의해 냉각된 증발가스를 팽창시키는 감압장치;를 포함하는, 선박이 제공된다.According to an aspect of the present invention, there is provided a ship including a system for re-liquefying evaporative gas generated in a storage tank, the compressor comprising: a compressor for compressing evaporative gas discharged from the storage tank; An oil separator for filtering the oil contained in the evaporated gas compressed by the compressor; A first heat exchanger for exchanging heat between the evaporated gas compressed by the compressor and the evaporated gas discharged from the storage tank; And a decompression device for expanding the evaporated gas cooled by the first heat exchanger after being compressed by the compressor.

상기 선박은, 상기 오일분리기 후단에 설치되는 오일필터를 더 포함할 수 있고, 상기 오일분리기는 액체 상태의 오일을 분리할 수 있고, 상기 오일필터는 안개(mist) 상태의 오일 및 기체 상태의 오일을 분리할 수 있다.The ship may further include an oil filter disposed at a rear end of the oil separator, wherein the oil separator is capable of separating the oil in a liquid state, and the oil filter is a mist- Can be separated.

상기 오일필터는 통합식(Coalescing Type) 오일필터일 수 있다.The oil filter may be a coalescing type oil filter.

상기 선박은, 상기 압축기, 상기 제1 열교환기, 및 상기 감압장치를 통과하며 재액화된 액화천연가스와, 재액화되지 못하고 기체상태로 남아있는 증발가스를 분리하는 기액분리기를 더 포함할 수 있다.The vessel may further include a gas-liquid separator for separating the liquefied natural gas that has passed through the compressor, the first heat exchanger, and the decompression device and re-liquefied, and the evaporated gas that remains in a gaseous state .

상기 기액분리기에 의해 분리된 액화천연가스는 상기 저장탱크로 보내질 수 있고, 상기 기액분리기에 의해 분리된 증발가스는 상기 저장탱크로부터 배출되는 증발가스와 합류되어 상기 제1 열교환기로 보내질 수 있다.The liquefied natural gas separated by the gas-liquid separator may be sent to the storage tank, and the evaporated gas separated by the gas-liquid separator may be combined with the evaporated gas discharged from the storage tank and sent to the first heat exchanger.

상기 선박은, 상기 기액분리기에 의해 분리된 증발가스를 냉매로 하여, 상기 압축기에 의해 압축된 후 상기 제1 열교환기에 의해 냉각된 증발가스를, 추가로 열교환시켜 냉각시키는 제2 열교환기를 더 포함할 수 있고, 상기 압축기 및 상기 제1 열교환기를 통과한 증발가스는, 상기 제2 열교환기 및 상기 감압장치를 통과한 후 상기 기액분리기로 보내질 수 있다.The ship further includes a second heat exchanger that uses the evaporated gas separated by the gas-liquid separator as a refrigerant and further cools the evaporated gas cooled by the compressor and then cooled by the first heat exchanger And the evaporator gas passing through the compressor and the first heat exchanger may be sent to the gas-liquid separator after passing through the second heat exchanger and the decompressor.

상기 선박은, 상기 기액분리기에 의해 분리된 증발가스를 상기 제2 열교환기에 보내는 라인 상에 설치되는 밸브를 더 포함할 수 있다.The vessel may further include a valve installed on a line for sending the vaporized gas separated by the gas-liquid separator to the second heat exchanger.

상기 압축기에 의해 압축된 증발가스의 일부는 고압엔진으로 보내질 수 있다.A portion of the evaporated gas compressed by the compressor may be sent to the high pressure engine.

상기 압축기는 증발가스를 대략 150 bar 내지 350 bar 압력으로 압축시킬 수 있다.The compressor is capable of compressing the evaporation gas to a pressure of approximately 150 bar to 350 bar.

상기 압축기는 증발가스를 대략 6 bar 내지 20 bar 압력으로 압축시킬 수 있다.The compressor may compress the evaporation gas to a pressure of approximately 6 bar to 20 bar.

상기 압축기는 다수개의 실린더를 포함할 수 있고, 상기 다수개의 실린더의 일부 또는 전부는 급유 윤활 방식일 수 있다.The compressor may include a plurality of cylinders, and some or all of the plurality of cylinders may be refueled.

상기 다수개의 실린더 중 전단의 일부 실린더는 무급유 윤활 방식이고, 후단의 나머지 실린더는 급유 윤활 방식일 수 있다.Some of the cylinders at the front end of the plurality of cylinders may be lubrication-free, and the remaining cylinders at the rear end may be lubrication-lubricating.

적어도 한 대의 급유 윤활 방식의 실린더를 통과한 증발가스는, 상기 압축기 중간에서 분기되어 상기 오일분리기로 보내질 수 있다.The evaporated gas that has passed through at least one cylinder of the oil supply type lubricating system can be branched in the middle of the compressor and sent to the oil separator.

상기 오일분리기에 의해 분리된 오일은, 상기 압축기에 윤활유를 공급하는 윤활유 탱크로 보내지거나 슬러지 탱크로 보내질 수 있다.The oil separated by the oil separator may be sent to a lubricating oil tank for supplying lubricating oil to the compressor or may be sent to a sludge tank.

상기 다수개의 실린더 중 일부를 통과한 증발가스는 분기되어 저압엔진 및 GCU 중 하나 이상으로 보내질 수 있다.The vaporized gas that has passed through a portion of the plurality of cylinders may branch off and be sent to at least one of the low pressure engine and the GCU.

상기 저압엔진은, 대략 6 bar 내지 10 bar 압력의 증발가스를 연료로 사용할 수 있다.The low pressure engine can use a vapor of gas at about 6 bar to 10 bar pressure as fuel.

상기 목적을 달성하기 위한 본 발명의 다른 측면에 따르면, 저장탱크에서 발생하는 증발가스를 재액화시키는 방법에 있어서, 1) 상기 저장탱크로부터 배출되는 증발가스를 압축시키고, 2) 상기 1)단계에서 압축된 증발가스의 일부를 고압엔진으로 보내고, 3) 상기 1)단계에서 압축된 증발가스의 나머지 일부에 포함된 오일을 분리하고, 4) 상기 3)단계에서 오일이 분리된 증발가스를 상기 저장탱크로부터 배출되는 증발가스와 열교환시켜 냉각시키고, 5) 상기 4)단계에서 냉각된 증발가스를 감압시키는, 방법이 제공된다.According to another aspect of the present invention, there is provided a method of re-liquefying an evaporative gas generated in a storage tank, comprising: 1) compressing an evaporative gas discharged from the storage tank; 2) 3) separating the oil contained in the remaining part of the evaporated gas compressed in the step 1), and 4) separating the oil-separated evaporated gas from the storage tank And 5) depressurizing the evaporated gas cooled in the step 4) is provided.

상기 3)단계는, 3-1) 오일분리기에 의해 액체 상태의 오일이 분리되는 단계; 및 3-2) 오일필터에 의해 안개(mist) 상태의 오일과 기체 상태의 오일이 분리되는 단계;를 포함할 수 있다.The step 3) comprises: 3-1) separating the liquid state oil by the oil separator; And 3-2) separating the oil in the mist state and the oil in the gaseous state by the oil filter.

상기 방법은, 6) 상기 5)단계에서 감압되어 재액화된 액화천연가스와 기체 상태로 남아있는 증발가스를 분리하고, 7) 상기 6)단계에서 분리한 증발가스를 냉매로 열교환시켜, 상기 4)단계에서 냉각된 증발가스를 추가적으로 냉각시키고, 상기 7)단계에서 추가 냉각된 증발가스를 상기 5)단계에서 감압시키는 단계를 더 포함할 수 있다.6) separating the liquefied natural gas decompressed and re-liquefied in the step 5) and the evaporated gas remaining in the gaseous state, 7) heat-exchanging the evaporated gas separated in the step 6) with the refrigerant, ) Further cooling the evaporated gas cooled in step (7), and reducing the evaporated gas further cooled in step (7) in step (5).

본 발명에 의하면, 압축된 증발가스에 포함되어 있는 오일을 제거한 후 재액화시키므로, 응축된 오일에 의해 열교환기의 유로가 막히는 것을 방지할 수 있다.According to the present invention, since the oil contained in the compressed evaporated gas is removed and re-liquefied, the flow path of the heat exchanger can be prevented from being clogged by the condensed oil.

또한, 본 발명의 일 실시예에 의하면, 오일분리기와 오일필터에 의해 단계적으로 오일을 제거하므로, 액체 상태, 안개(mist) 상태, 및 기체 상태의 오일을 모두 효과적으로 제거할 수 있다.Further, according to the embodiment of the present invention, since the oil is gradually removed by the oil separator and the oil filter, it is possible to effectively remove both the oil in the liquid state, the mist state, and the gaseous state.

증발가스 자체를 냉매로 사용하여 증발가스를 재액화시키는 시스템에 의하면, 실린더를 통과하며 오일이 섞인 증발가스가 순환하여 다시 실린더로 공급될 수 있으므로, 시스템을 가동시킴에 따라 증발가스에 섞인 오일의 양이 점점 늘어날 수 있다. 따라서, 본 발명은 특히 증발가스가 순환하는 시스템에서 특히 효과적이다.According to the system for re-liquefying the evaporation gas by using the evaporation gas itself as the refrigerant, the evaporation gas mixed with the oil can be circulated through the cylinder and supplied to the cylinder again, so that the amount of oil mixed with the evaporation gas Can be increased. Therefore, the present invention is particularly effective in a system in which evaporation gas circulates.

도 1은 본 발명의 바람직한 실시예에 따른 선박의 증발가스 처리 시스템을 개략적으로 나타낸 구성도이다.BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a system for processing an evaporative gas of a ship according to a preferred embodiment of the present invention; FIG.

이하 첨부한 도면을 참조하여 본 발명의 바람직한 실시예에 대한 구성 및 작용을 상세히 설명하면 다음과 같다. 본 발명의 선박은, 천연가스를 연료로 사용하는 엔진을 탑재한 선박 및 액화가스 저장탱크를 포함하는 선박 등에 다양하게 응용되어 적용될 수 있다. 또한, 하기 실시예는 여러 가지 다른 형태로 변형될 수 있으며, 본 발명의 범위가 하기 실시예에 한정되는 것은 아니다.DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The ship of the present invention can be applied to various applications such as a ship equipped with an engine using natural gas as fuel and a ship including a liquefied gas storage tank. In addition, the following examples can be modified in various forms, and the scope of the present invention is not limited to the following examples.

본 발명의 후술할 증발가스 처리를 위한 시스템들은 저온 액체화물 또는 액화가스를 저장할 수 있는 저장탱크가 설치된 모든 종류의 선박과 해상 구조물, 즉 액화천연가스 운반선, 액화에탄가스(Liquefied Ethane Gas) 운반선, LNG RV와 같은 선박을 비롯하여, LNG FPSO, LNG FSRU와 같은 해상 구조물에 적용될 수 있다. 다만 후술하는 실시예들에서는 설명의 편의상 대표적인 저온 액체화물인 액화천연가스를 예로 들어 설명한다.Systems for the treatment of the evaporative gas to be described below of the present invention include all types of ships and marine structures, such as liquefied natural gas carriers, liquefied ethane gas carriers, and the like, with storage tanks capable of storing low temperature liquid cargo or liquefied gas, It can be applied to marine structures such as LNG FPSO and LNG FSRU as well as ships such as LNG RV. However, in the following embodiments, liquefied natural gas, which is a typical low temperature liquid cargo, will be described as an example for convenience of explanation.

또한, 본 발명의 각 라인에서의 유체는, 시스템의 운용 조건에 따라, 액체 상태, 기액 혼합 상태, 기체 상태, 초임계유체 상태 중 어느 하나의 상태일 수 있다.The fluid in each line of the present invention may be in any one of a liquid state, a gas-liquid mixed state, a gas state, and a supercritical fluid state, depending on operating conditions of the system.

도 1은 본 발명의 바람직한 실시예에 따른 선박의 증발가스 처리 시스템을 개략적으로 나타낸 구성도이다.BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a system for processing an evaporative gas of a ship according to a preferred embodiment of the present invention; FIG.

도 1을 참조하면, 본 실시예의 선박에 포함되는 증발가스 처리 시스템은, 제1 열교환기(100), 압축기(200), 오일분리기(300), 및 감압장치(600)를 포함한다.Referring to FIG. 1, the evaporative gas treatment system included in the vessel of the present embodiment includes a first heat exchanger 100, a compressor 200, an oil separator 300, and a pressure reducing device 600.

본 실시예의 제1 열교환기(100)는, 저장탱크(T)로부터 배출되는 증발가스를 냉매로 압축기(200)에 의해 압축된 증발가스를 열교환시켜 냉각시킨다. 저장탱크(T)로부터 배출된 후 제1 열교환기(100)에서 냉매로 사용된 증발가스는 온도가 높아진 후 압축기(200)로 보내지고, 압축기(200)에 의해 압축된 후 제1 열교환기(100)에 의해 냉각된 증발가스는 감압장치(600)로 보내진다. The first heat exchanger 100 of the present embodiment cools the evaporation gas discharged from the storage tank T by heat exchange with the evaporation gas compressed by the compressor 200 by the refrigerant. The evaporated gas used as the refrigerant in the first heat exchanger 100 after being discharged from the storage tank T is sent to the compressor 200 after the temperature is increased and is compressed by the compressor 200 and then supplied to the first heat exchanger 100 is sent to the decompression apparatus 600. [

본 실시예의 압축기(200)는, 저장탱크(T)로부터 배출된 후 제1 열교환기(100)에서 냉매로 사용된 증발가스를 압축시킨다. 압축기(200)에 의해 압축된 증발가스는 둘로 분기하여 일부는 고압엔진의 연료로 공급되고, 나머지는 오일분리기(300)로 보내질 수 있다. 압축기(200)에 의해 압축된 증발가스가 고압엔진으로 보내지는 경우, 압축기(200)는 증발가스를 고압엔진이 요구하는 압력까지 압축시킬 수 있다. 고압엔진은 대략 150 bar 내지 350 bar 압력의 증발가스를 연료로 사용하는 ME-GI엔진일 수도 있고, 대략 6 bar 내지 20 bar 압력의 증발가스를 연료로 사용하는 X-DF엔진일 수도 있다.The compressor (200) of this embodiment compresses the evaporated gas used as the refrigerant in the first heat exchanger (100) after being discharged from the storage tank (T). The evaporated gas compressed by the compressor 200 may be branched into two parts, some of which may be supplied to the fuel of the high-pressure engine, and the remainder may be sent to the oil separator 300. When the evaporated gas compressed by the compressor 200 is sent to the high-pressure engine, the compressor 200 can compress the evaporated gas to a pressure required by the high-pressure engine. The high-pressure engine may be an ME-GI engine using a vapor of about 150 bar to 350 bar as fuel, or an X-DF engine using a vapor of about 6 bar to 20 bar as fuel.

압축기(200)는 다수개의 실린더(210, 220, 230, 240, 250)와, 다수개의 실린더(210, 220, 230, 240, 250) 후단에 각각 설치되는 다수개의 냉각기(211, 221, 231, 241, 251)를 포함할 수 있다. 냉각기(211, 221, 231, 241, 251)는 실린더(210, 220, 230, 240, 250)에 의해 압축되며 압력뿐만 아니라 온도도 높아진 증발가스를 냉각시킨다.The compressor 200 includes a plurality of cylinders 210, 220, 230, 240 and 250 and a plurality of coolers 211, 221, 231, and 231 installed at the downstream ends of the plurality of cylinders 210, 220, 230, 241, 251). The coolers 211, 221, 231, 241 and 251 are compressed by the cylinders 210, 220, 230, 240 and 250 and cools the evaporated gas not only in pressure but also in temperature.

도 1에는, 증발가스가 압축기(200)에 포함된 다수개의 실린더(210, 220, 230, 240, 250)를 전부 통과한 후 둘로 분기되어 일부가 오일분리기(300)로 보내지는 경우를 도시하였으나, 다수개의 실린더(210, 220, 230, 240, 250) 중 일부를 통과한 증발가스를 압축기(200) 중간에서 분기시켜 오일분리기(300)로 보낼 수도 있다.1 shows a case in which an evaporating gas is entirely passed through a plurality of cylinders 210, 220, 230, 240 and 250 included in the compressor 200 and then branched into two parts and sent to an oil separator 300 The evaporated gas passing through a part of the plurality of cylinders 210, 220, 230, 240 and 250 may be branched from the middle of the compressor 200 and sent to the oil separator 300.

또한, 다수개의 실린더(210, 220, 230, 240, 250) 중 일부를 통과한 증발가스를 압축기(200) 중간에서 분기시켜 저압엔진으로 보내 연료로 사용할 수 있고, 잉여 증발가스는 가스연소장치(GCU; Gas Combustion Unit)로 보내 연소시킬 수도 있다.Further, the evaporated gas passing through a part of the plurality of cylinders 210, 220, 230, 240 and 250 may be branched from the middle of the compressor 200 to be sent to the low-pressure engine for use as fuel, GCU (Gas Combustion Unit).

저압엔진은 대략 6 bar 내지 10 bar 압력의 증발가스를 연료로 사용하는 DF엔진일 수 있고, 고압엔진이 ME-GI엔진인 경우 저압엔진은 ME-GI엔진보다 낮은 압력의 증발가스를 연료로 사용하는 X-DF엔진일 수도 있다.The low-pressure engine may be a DF engine using a boil-off gas of about 6 bar to 10 bar pressure as a fuel. If the high-pressure engine is an ME-GI engine, the low-pressure engine uses a vapor of lower pressure than the ME- Or an X-DF engine.

압축기(200)에 포함되는 다수개의 실린더(210, 220, 230, 240, 250)는, 일부는 무급유 윤활(oil-free lubricated) 방식으로 동작하고 나머지는 급유 윤활(oil lubricated) 방식으로 동작할 수 있다. 급유 윤활 방식의 실린더를 통과한 증발가스는 오일분리기(300)로 보내지도록 구성되고, 무급유 윤활 방식의 실린더만을 통과한 증발가스는 오일분리기(300)를 통과하지 않고 바로 제1 열교환기(100)로 보내지도록 구성될 수도 있다.The plurality of cylinders 210, 220, 230, 240, and 250 included in the compressor 200 may operate in an oil-free lubricated manner and others may operate in an oil lubricated manner. have. The evaporated gas that has passed through the cylinder of the refueling and lubricating system is sent to the oil separator 300. The evaporated gas that has passed through only the cylinder of the non-lube lubricating system passes through the first heat exchanger 100 without passing through the oil separator 300, As shown in FIG.

일례로 본 실시예의 압축기(200)는 5개의 실린더(210, 220, 230, 240, 250)를 포함하고, 전단 3개의 실린더(210, 220, 230)는 무급유 윤활 방식이고 후단 2개의 실린더(240, 250)는 급유 윤활 방식일 수 있는데, 3단 이하에서 증발가스를 분기시키는 경우에는 증발가스가 오일분리기(300)를 통과하지 않고 바로 제1 열교환기(100)로 보내지고, 4단 이상에서 증발가스를 분기시키는 경우에는 증발가스가 오일분리기(300)를 통과한 후 제1 열교환기(100)로 보내지도록 구성될 수 있다.For example, the compressor 200 of the present embodiment includes five cylinders 210, 220, 230, 240 and 250, the front three cylinders 210, 220 and 230 are non-lubrication lubricating systems and the two cylinders 240 , 250 may be an oil supply lubricating system. In the case where the evaporation gas is branched in the third stage or less, the evaporation gas is directly sent to the first heat exchanger 100 without passing through the oil separator 300, When the evaporation gas is branched, the evaporation gas may be sent to the first heat exchanger 100 after passing through the oil separator 300.

본 실시예의 오일분리기(300)는, 압축기(200)를 통과한 증발가스에 섞여있는 오일을 분리한다. 압축기(200)가 급유 윤활 방식의 실린더를 포함하는 경우, 급유 윤활 방식의 실린더를 통과한 증발가스에는 소량의 윤활유가 섞이게 된다. 실린더를 통과하여 압축된 증발가스와 섞인 윤활유는, 압축된 증발가스와 함께 배관의 벽면을 타고 흐르는 형태(Wall Flow)로 흐를 수 있다.The oil separator 300 of this embodiment separates the oil mixed in the evaporated gas that has passed through the compressor 200. When the compressor (200) includes a cylinder of a refueling type, a small amount of lubricating oil is mixed in the evaporation gas that has passed through the cylinder of the refueling type. The lubricating oil mixed with the evaporated gas compressed through the cylinder can flow through the wall flow along the pipe wall together with the compressed evaporated gas.

증발가스에 섞인 윤활유는, 제1 열교환기(100)에서 증발가스를 냉각시킬 때 증발가스보다 먼저 응축되어 제1 열교환기(100)의 유로를 막을 수 있는데, 본 발명에 의하면 증발가스가 제1 열교환기(100)에 의해 냉각되기 전에 오일분리기(300)에 의해 오일을 분리해내므로, 제1 열교환기(100)의 유로가 응축된 오일에 의해 막히는 현상을 방지할 수 있다.The lubricating oil mixed with the evaporating gas can be condensed before the evaporating gas to cool the flow path of the first heat exchanger 100 when the evaporating gas is cooled in the first heat exchanger 100. According to the present invention, Since the oil is separated by the oil separator 300 before being cooled by the heat exchanger 100, the flow path of the first heat exchanger 100 can be prevented from being clogged by the condensed oil.

본 실시예의 감압장치(600)는, 압축기(200), 오일분리기(300), 및 제1 열교환기(100)를 통과한 증발가스를 팽창시킨다. 압축기(200)에 의한 압축, 제1 열교환기(100)에 의한 냉각, 및 감압장치(600)에 의한 팽창과정을 거친 증발가스는 일부 또는 전부가 재액화된다. 본 실시예의 감압장치(600)는 팽창기일수도 있고 줄-톰슨 밸브 등의 팽창밸브일 수도 있다.The decompression apparatus 600 of the present embodiment expands the evaporation gas that has passed through the compressor 200, the oil separator 300, and the first heat exchanger 100. Some or all of the evaporated gas that has undergone the compression by the compressor 200, the cooling by the first heat exchanger 100, and the expansion by the decompressor 600 is re-liquefied. The pressure reducing device 600 of the present embodiment may be an expander or an expansion valve such as a line-Thomson valve.

본 실시예에 따른 선박의 증발가스 처리 시스템은, 오일분리기(300) 후단에 설치되는 오일필터(400)를 더 포함할 수 있다. 오일분리기(300)에 의하여서는 액체 상태의 오일만 분리되고, 안개(mist) 상태 또는 기체 상태의 오일은 분리되지 않을 수 있는데, 본 실시예의 오일필터(400)는 오일분리기(300)가 분리해내지 못한 안개(mist) 상태 및 기체 상태의 오일을 분리할 수 있다. 본 실시예의 오일필터(400)는 통합식(Coalescing Type) 오일필터일 수 있다.The evaporative gas treatment system of the present invention may further include an oil filter 400 installed at a downstream end of the oil separator 300. The oil separator 300 separates only the liquid oil and the mist or gaseous oil may not be separated from the oil separator 300. The oil filter 400 of this embodiment separates the oil separator 300 from the oil separator 300, It is possible to separate the mist state and the gaseous state which can not be obtained. The oil filter 400 of this embodiment may be a coalescing type oil filter.

오일분리기(300) 또는 오일필터(400)에 의해 분리된 오일은, 압축기(200)에 윤활유를 공급하는 윤활유 탱크(미도시)에 다시 저장될 수도 있고, 별도로 설치되는 슬러지 탱크(Sludge Tank, 미도시) 등에 저장될 수도 있다.The oil separated by the oil separator 300 or the oil filter 400 may be stored again in a lubricant tank (not shown) for supplying the lubricant to the compressor 200 or may be stored in a separate sludge tank City) or the like.

본 실시예에 따른 선박의 증발가스 처리 시스템은, 압축기(200), 제1 열교환기(100), 및 감압장치(600)를 통과하며 재액화된 액화천연가스와, 재액화되지 못하고 기체상태로 남아있는 증발가스를 분리하는 기액분리기(700)를 더 포함할 수 있다.The ship's evaporative gas processing system according to the present embodiment is a system in which the liquefied natural gas passing through the compressor 200, the first heat exchanger 100, and the decompressor 600 and the liquefied natural gas, And a gas-liquid separator 700 for separating the remaining evaporated gas.

기액분리기(700)에 의해 분리된 액화천연가스는 저장탱크(T)로 보내질 수 있고, 기액분리기(700)에 의해 분리된 증발가스는 저장탱크(T)로부터 배출되는 증발가스와 합류되어 제1 열교환기(100)로 보내질 수 있다.The liquefied natural gas separated by the gas-liquid separator 700 can be sent to the storage tank T. The evaporated gas separated by the gas-liquid separator 700 is combined with the evaporated gas discharged from the storage tank T, Can be sent to the heat exchanger (100).

본 실시예에 따른 선박의 증발가스 처리 시스템은, 압축기(200)에 의해 압축된 후 제1 열교환기(100)에 의해 1차로 냉각된 증발가스를, 기액분리기(700)에 의해 분리된 증발가스를 냉매로 열교환시켜 2차로 냉각시키는 제2 열교환기(500)를 더 포함할 수 있다.The evaporative gas processing system of the present invention is a system for processing a vapor of a ship, which is compressed by a compressor (200) and then primarily cooled by a first heat exchanger (100) And a second heat exchanger (500) for secondarily cooling the refrigerant by heat exchange with refrigerant.

본 실시예가 제2 열교환기(500)를 포함하는 경우, 압축기(200), 오일분리기(300), 및 제1 열교환기(100)를 통과한 증발가스는, 제2 열교환기(500) 및 감압장치(600)를 통과한 후 기액분리기(700)로 보내지고, 기액분리기(700)에 의해 분리된 증발가스는 제2 열교환기(500)를 통과한 후 저장탱크(T)로부터 배출되는 증발가스와 합류되어 제1 열교환기(100)로 보내진다.When the present embodiment includes the second heat exchanger 500, the evaporated gas that has passed through the compressor 200, the oil separator 300, and the first heat exchanger 100 passes through the second heat exchanger 500, Liquid separator 700. The evaporated gas separated by the gas-liquid separator 700 passes through the second heat exchanger 500 and then the evaporated gas discharged from the storage tank T And is then sent to the first heat exchanger 100.

본 실시예에 따른 선박의 증발가스 처리 시스템은, 기액분리기(700)에 의해 분리된 증발가스를 제2 열교환기(500)에 보내는 라인 상에 설치되어, 증발가스의 유량 및 개폐를 조절하는 밸브(800)를 더 포함할 수 있다.The evaporative gas treatment system of the present embodiment is provided on a line that sends the evaporated gas separated by the gas-liquid separator 700 to the second heat exchanger 500, and controls the flow rate of the evaporated gas and the valve (800).

본 실시예에 따른 선박의 증발가스 처리 시스템이 기액분리기(700)와 제2 열교환기(500)를 포함하는 경우, 재액화 과정을 거치는 증발가스를 기액분리기(700)에 의해 분리된 증발가스의 냉열에 의해 추가적으로 냉각시키므로, 재액화 효율 및 재액화량을 증가시킬 수 있다. Liquid separator 700 and the second heat exchanger 500, the evaporation gas passing through the re-liquefaction process is introduced into the vapor-liquid separator 700 by the gas-liquid separator 700 It is possible to increase the re-liquefaction efficiency and re-liquefaction amount by further cooling by cold heat.

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 자에 있어서 자명한 것이다.It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. It is.

100 : 제1 열교환기 200 : 압축기
210, 220, 230, 240, 250 : 실린더
211, 221, 231, 241, 251 : 냉각기
300 : 오일분리기 400 : 오일필터
500 : 제2 열교환기 600 : 감압장치
700 : 기액분리기 800 : 밸브100: first heat exchanger 200: compressor
210, 220, 230, 240, 250: cylinder
211, 221, 231, 241, 251:
300: Oil separator 400: Oil filter
500: Second heat exchanger 600: Pressure reducing device
700: gas-liquid separator 800: valve

Claims (19)

저장탱크에서 발생하는 증발가스를 재액화시키는 시스템을 포함하는 선박에 있어서,
상기 저장탱크로부터 배출되는 증발가스를 압축시키는 압축기;
상기 압축기에 의해 압축된 증발가스에 포함된 오일을 걸러내는 오일분리기;
상기 압축기에 의해 압축된 증발가스를 상기 저장탱크로부터 배출되는 증발가스와 열교환시켜 냉각시키는 제1 열교환기; 및
상기 압축기에 의해 압축된 후 상기 제1 열교환기에 의해 냉각된 증발가스를 팽창시키는 감압장치;
를 포함하는, 선박.A ship comprising a system for re-liquefying evaporative gas generated in a storage tank,
A compressor for compressing the evaporated gas discharged from the storage tank;
An oil separator for filtering the oil contained in the evaporated gas compressed by the compressor;
A first heat exchanger for exchanging heat between the evaporated gas compressed by the compressor and the evaporated gas discharged from the storage tank; And
A decompression device for expanding the evaporated gas cooled by the first heat exchanger after being compressed by the compressor;
. 청구항 1에 있어서,
상기 오일분리기 후단에 설치되는 오일필터를 더 포함하고,
상기 오일분리기는 액체 상태의 오일을 분리하고,
상기 오일필터는 안개(mist) 상태의 오일 및 기체 상태의 오일을 분리하는, 선박.The method according to claim 1,
Further comprising an oil filter installed at a rear end of the oil separator,
The oil separator separates the oil in the liquid state,
Wherein the oil filter separates oil in a mist state and oil in a gaseous state. 청구항 2에 있어서,
상기 오일필터는 통합식(Coalescing Type) 오일필터인, 선박.The method of claim 2,
Wherein the oil filter is a coalescing type oil filter. 청구항 1 내지 청구항 3 중 어느 한 항에 있어서,
상기 압축기, 상기 제1 열교환기, 및 상기 감압장치를 통과하며 재액화된 액화천연가스와, 재액화되지 못하고 기체상태로 남아있는 증발가스를 분리하는 기액분리기를 더 포함하는, 선박.The method according to any one of claims 1 to 3,
Further comprising a gas-liquid separator that separates the liquefied natural gas that has passed through the compressor, the first heat exchanger, and the decompression device and that has been re-liquefied, and the evaporated gas that remains in a gaseous state without being re-liquefied. 청구항 4에 있어서,
상기 기액분리기에 의해 분리된 액화천연가스는 상기 저장탱크로 보내지고,
상기 기액분리기에 의해 분리된 증발가스는 상기 저장탱크로부터 배출되는 증발가스와 합류되어 상기 제1 열교환기로 보내지는, 선박.The method of claim 4,
The liquefied natural gas separated by the gas-liquid separator is sent to the storage tank,
Wherein the evaporated gas separated by the gas-liquid separator is combined with the evaporated gas discharged from the storage tank and sent to the first heat exchanger. 청구항 4에 있어서,
상기 기액분리기에 의해 분리된 증발가스를 냉매로 하여, 상기 압축기에 의해 압축된 후 상기 제1 열교환기에 의해 냉각된 증발가스를, 추가로 열교환시켜 냉각시키는 제2 열교환기를 더 포함하고,
상기 압축기 및 상기 제1 열교환기를 통과한 증발가스는, 상기 제2 열교환기 및 상기 감압장치를 통과한 후 상기 기액분리기로 보내지는, 선박.The method of claim 4,
Further comprising a second heat exchanger using the evaporated gas separated by the gas-liquid separator as a refrigerant and further cooling the evaporated gas cooled by the compressor and then cooled by the first heat exchanger,
Wherein the evaporator gas passing through the compressor and the first heat exchanger is sent to the gas-liquid separator after passing through the second heat exchanger and the decompression device. 청구항 6에 있어서,
상기 기액분리기에 의해 분리된 증발가스를 상기 제2 열교환기에 보내는 라인 상에 설치되는 밸브를 더 포함하는, 선박.The method of claim 6,
Further comprising a valve installed on a line for sending the vaporized gas separated by the gas-liquid separator to the second heat exchanger. 청구항 1 내지 청구항 3 중 어느 한 항에 있어서,
상기 압축기에 의해 압축된 증발가스의 일부는 고압엔진으로 보내지는, 선박.The method according to any one of claims 1 to 3,
Wherein some of the evaporated gas compressed by the compressor is sent to the high-pressure engine. 청구항 8에 있어서,
상기 압축기는 증발가스를 대략 150 bar 내지 350 bar 압력으로 압축시키는, 선박.The method of claim 8,
Wherein the compressor compresses the evaporation gas to a pressure of approximately 150 bar to 350 bar. 청구항 8에 있어서,
상기 압축기는 증발가스를 대략 6 bar 내지 20 bar 압력으로 압축시키는, 선박.The method of claim 8,
Wherein the compressor compresses the evaporation gas to a pressure of approximately 6 bar to 20 bar. 청구항 1 내지 청구항 3 중 어느 한 항에 있어서,
상기 압축기는 다수개의 실린더를 포함하고,
상기 다수개의 실린더의 일부 또는 전부는 급유 윤활 방식인, 선박.The method according to any one of claims 1 to 3,
The compressor comprising a plurality of cylinders,
Wherein some or all of said plurality of cylinders are refueling lubrication systems. 청구항 11에 있어서,
상기 다수개의 실린더 중 전단의 일부 실린더는 무급유 윤활 방식이고, 후단의 나머지 실린더는 급유 윤활 방식인, 선박.The method of claim 11,
Wherein some of the cylinders at the front end of the plurality of cylinders are of non-lube oil lubrication type, and the remaining cylinders at the rear end are lubrication oil lubrication type. 청구항 11에 있어서,
적어도 한 대의 급유 윤활 방식의 실린더를 통과한 증발가스는, 상기 압축기 중간에서 분기되어 상기 오일분리기로 보내지는, 선박.The method of claim 11,
Wherein the evaporated gas that has passed through at least one cylinder of the oil supply and lubricating system is branched in the middle of the compressor and sent to the oil separator. 청구항 1 내지 청구항 3 중 어느 한 항에 있어서,
상기 오일분리기에 의해 분리된 오일은, 상기 압축기에 윤활유를 공급하는 윤활유 탱크로 보내지거나 슬러지 탱크로 보내지는, 선박.The method according to any one of claims 1 to 3,
Wherein the oil separated by the oil separator is sent to a lubricating oil tank for supplying the lubricating oil to the compressor or to a sludge tank. 청구항 11에 있어서,
상기 다수개의 실린더 중 일부를 통과한 증발가스는 분기되어 저압엔진 및 GCU 중 하나 이상으로 보내지는, 선박.The method of claim 11,
Wherein the evaporative gas that has passed through a portion of the plurality of cylinders branches and is sent to at least one of a low pressure engine and a GCU. 청구항 15에 있어서,
상기 저압엔진은, 대략 6 bar 내지 10 bar 압력의 증발가스를 연료로 사용하는, 선박.16. The method of claim 15,
Wherein the low pressure engine uses evaporative gas at about 6 bar to 10 bar pressure as fuel. 저장탱크에서 발생하는 증발가스를 재액화시키는 방법에 있어서,
1) 상기 저장탱크로부터 배출되는 증발가스를 압축시키고,
2) 상기 1)단계에서 압축된 증발가스의 일부를 고압엔진으로 보내고,
3) 상기 1)단계에서 압축된 증발가스의 나머지 일부에 포함된 오일을 분리하고,
4) 상기 3)단계에서 오일이 분리된 증발가스를 상기 저장탱크로부터 배출되는 증발가스와 열교환시켜 냉각시키고,
5) 상기 4)단계에서 냉각된 증발가스를 감압시키는, 방법.A method for re-liquefying evaporative gas generated in a storage tank,
1) compressing the evaporation gas discharged from the storage tank,
2) sending part of the evaporated gas compressed in the step 1) to the high-pressure engine,
3) separating the oil contained in the remaining part of the evaporated gas compressed in the step 1)
4) cooling the evaporated gas from which the oil is separated in the step 3) by heat exchange with the evaporated gas discharged from the storage tank,
5) A method for reducing the pressure of evaporated gas cooled in step 4). 청구항 17에 있어서,
상기 3)단계는,
3-1) 오일분리기에 의해 액체 상태의 오일이 분리되는 단계; 및
3-2) 오일필터에 의해 안개(mist) 상태의 오일과 기체 상태의 오일이 분리되는 단계;
를 포함하는, 방법. 18. The method of claim 17,
The step (3)
3-1) separating the liquid state oil by the oil separator; And
3-2) Separation of oil in the mist state and oil in the gaseous state by the oil filter;
/ RTI > 청구항 17 또는 청구항 18에 있어서,
6) 상기 5)단계에서 감압되어 재액화된 액화천연가스와 기체 상태로 남아있는 증발가스를 분리하고,
7) 상기 6)단계에서 분리한 증발가스를 냉매로 열교환시켜, 상기 4)단계에서 냉각된 증발가스를 추가적으로 냉각시키고,
상기 7)단계에서 추가 냉각된 증발가스를 상기 5)단계에서 감압시키는, 방법.The method according to claim 17 or 18,
6) separating the liquefied natural gas decompressed and re-liquefied in the step 5) and the evaporated gas remaining in the gaseous state,
7) The evaporation gas separated in the step 6) is heat-exchanged with the refrigerant to further cool the evaporated gas cooled in the step 4)
And the reduced-pressure evaporated gas in the step 7) is depressurized in the step 5).
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KR20190080361A (en) * 2017-12-28 2019-07-08 대우조선해양 주식회사 Boil-off gas reliquefaction system and method for vessel
KR20190102417A (en) * 2018-02-26 2019-09-04 대우조선해양 주식회사 Boil-Off Gas Reliquefaction System and Method for Vessel
KR102044273B1 (en) * 2018-08-20 2019-11-13 대우조선해양 주식회사 BOG Reliquefaction System and Method for Vessels

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KR102033537B1 (en) * 2018-02-26 2019-10-17 대우조선해양 주식회사 Boil-Off Gas Reliquefaction System and Method for Vessel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190080361A (en) * 2017-12-28 2019-07-08 대우조선해양 주식회사 Boil-off gas reliquefaction system and method for vessel
KR20190102417A (en) * 2018-02-26 2019-09-04 대우조선해양 주식회사 Boil-Off Gas Reliquefaction System and Method for Vessel
KR102044273B1 (en) * 2018-08-20 2019-11-13 대우조선해양 주식회사 BOG Reliquefaction System and Method for Vessels

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