KR20160112389A - BOG Re-liquefaction Apparatus and Method for Vessel - Google Patents

BOG Re-liquefaction Apparatus and Method for Vessel Download PDF

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KR20160112389A
KR20160112389A KR1020150038052A KR20150038052A KR20160112389A KR 20160112389 A KR20160112389 A KR 20160112389A KR 1020150038052 A KR1020150038052 A KR 1020150038052A KR 20150038052 A KR20150038052 A KR 20150038052A KR 20160112389 A KR20160112389 A KR 20160112389A
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South Korea
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gas
evaporated gas
storage tank
compressors
evaporated
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KR1020150038052A
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Korean (ko)
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제창호
정인돈
김인웅
이제명
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대우조선해양 주식회사
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Publication of KR20160112389A publication Critical patent/KR20160112389A/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
    • B63H21/12—Use of propulsion power plant or units on vessels the vessels being motor-driven
    • B63H21/14—Use of propulsion power plant or units on vessels the vessels being motor-driven relating to internal-combustion engines
    • 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
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied 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
    • F17C6/00—Methods and apparatus for filling vessels not under pressure with liquefied or solidified gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022—Hydrocarbons, e.g. natural gas
    • F25J1/0025—Boil-off gases "BOG" from storages
    • B63B2770/00—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J99/00—Subject matter not provided for in other groups of this subclass
    • B63J2099/001—Burning of transported goods, e.g. fuel, boil-off or refuse
    • B63J2099/003—Burning of transported goods, e.g. fuel, boil-off or refuse of cargo oil or fuel, or of boil-off gases, e.g. for propulsive purposes
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • 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
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0146—Two-phase
    • F17C2225/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2225/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • 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
    • F17C2265/015—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
    • F17C2265/031—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
    • 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
    • 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

Abstract

The present invention discloses a reliquefaction apparatus which uses the boil-off gas as a cooling fluid to reliquefy a boil-off gas generated from a liquefied natural gas storage tank installed on a vessel. An apparatus of reliquefying a boil-off gas for a vessel according to the present invention comprises: a plurality of compressors which compress a boil-off gas exhausted from the storage tank in multiple stages; a plurality of coolers each of which is installed at the rear end of the plurality of compressors to lower temperature of the boil-off gas; a self-heat exchanger which heat exchanges the boil-off gas compressed by the plurality of compressors and the boil-off gas exhausted from the storage tank; a decompression device which lowers pressure of the compressed boil-off gas passing through the self-heat exchanger; a gas-liquid separator which separates a boil-off gas reliquefied while passing through the decompression device and a boil-off gas in a gas state; and a bypass line which directly sends the boil-off gas to the storage tank by detouring a boil-off gas passing through the self-heat exchanger and the decompression device.

Description

선박용 증발가스 재액화 장치 및 방법{BOG Re-liquefaction Apparatus and Method for Vessel}BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and a method for re-

본 발명은 선박에 적용되는 액화천연가스 저장탱크에서 발생하는 증발가스의 재액화 장치 및 방법에 관한 것이다.The present invention relates to an apparatus and a method for re-liquefying evaporative gas generated in a liquefied natural gas storage tank applied to a ship.

천연가스는 통상 액화되어 액화천연가스(LNG; Liquefied Natural Gas) 상태로 원거리에 걸쳐 수송된다. 액화천연가스는 천연가스를 대략 상압 -163℃ 근처의 극저온으로 냉각하여 얻어지는 것으로, 가스 상태일 때보다 그 부피가 대폭적으로 감소되므로 해상을 통한 원거리 운반에 매우 적합하다.Natural gas is usually liquefied and transported over a long distance in the form of Liquefied Natural Gas (LNG). Liquefied natural gas is obtained by cooling natural gas at a cryogenic temperature of about -163 ° C at normal pressure. It is very suitable for long distance transportation through the sea because its volume is greatly reduced as compared with the gas state.

액화천연가스 저장탱크를 단열하여도 외부의 열을 완벽하게 차단시키는데에는 한계가 있고, 액화천연가스 내부로 전달되는 열에 의해 액화천연가스는 저장탱크 내에서 지속적으로 기화하게 된다. 저장탱크 내부에서 기화된 액화천연가스를 증발가스(BOG; Boil-Off Gas)라고 한다.Even if the liquefied natural gas storage tank is insulated, there is a limit to completely block external heat. Liquefied natural gas continuously vaporizes in the storage tank due to the heat transferred to the liquefied natural gas. Liquefied natural gas vaporized in the storage tank is called Boil-Off Gas (BOG).

증발가스의 발생으로 인하여 저장탱크의 압력이 설정된 안전압력 이상이 되면, 증발가스는 안전밸브를 통하여 저장탱크의 외부로 배출된다. 저장탱크 외부로 배출된 증발가스는 선박의 연료로 사용되거나 재액화되어 다시 저장탱크로 돌려보내진다.When the pressure of the storage tank becomes higher than the set safety pressure due to the generation of the evaporation gas, the evaporation gas is discharged to the outside of the storage tank through the safety valve. The evaporated gas discharged to the outside of the storage tank is used as the fuel of the ship or is re-liquefied and returned to the storage tank.

한편, 일반적으로 선박에 사용되는 엔진 중 천연가스를 연료로 사용할 수 있는 엔진으로 DF(Dual Fuel)엔진 및 ME-GI엔진이 있다.On the other hand, among the engines used in ships, there are DF (Dual Fuel) engine and ME-GI engine which can use natural gas as fuel.

DF엔진은, 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 DF engine 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 and compresses the piston as it rises.

ME-GI엔진은, 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-GI엔진에 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.

기존의 선박용 증발가스 재액화 장치 및 방법에 의하면, 재액화된 증발가스와 기체상태로 남아 있는 증발가스를 기액분리기에 의해 분리하여, 기체상태로 남아있는 증발가스를 다시 자가열교환기로 보냈는데, 자가열교환기로 보내진 증발가스는 다시 열교환, 압축 및 감압을 거쳐 기액분리기로 보내지는 순환과정을 거치게 된다. 이러한 순환과정을 거치면서 증발가스의 메탄 비율은 점점 줄어들고 질소의 비율이 높아져 재액화 효율이 떨어진다는 문제점이 있었다.According to the existing evaporating gas re-liquefying apparatus and method of the present invention, the re-liquefied evaporated gas and the evaporated gas remaining in the gaseous state are separated by the gas-liquid separator, and the remaining vaporized gas is sent to the autothermal exchanger again. The evaporated gas sent to the heat exchanger is circulated again through heat exchange, compression and decompression, and then to the gas-liquid separator. As a result of this circulation process, the methane ratio of the evaporation gas is gradually reduced, and the ratio of nitrogen is increased, resulting in a decrease in the re-liquefaction efficiency.

본 발명은, 증발가스의 메탄 비율에 따라, 증발가스를 기액분리기로 보내 재액화된 증발가스와 기체상태의 증발가스를 분리할지, 기액분리기를 우회하여 재액화된 증발가스와 기체상태의 증발가스를 함께 저장탱크로 보낼지 선택할 수 있는, 선박용 증발가스 재액화 장치 및 방법을 제공하는 것을 목적으로 한다. According to the present invention, the evaporation gas is sent to the gas-liquid separator in accordance with the methane ratio of the evaporation gas to separate the re-liquefied evaporated gas from the gaseous evaporated gas, bypass the gas-liquid separator, And to send it to the storage tank together with the evaporation gas re-liquefying device.

상기 목적을 달성하기 위한 본 발명의 일 측면에 따르면, 선박에 설치된 액화천연가스 저장탱크에서 발생하는 증발가스를 재액화하기 위하여 증발가스를 냉각 유체로 사용하는 재액화 장치에 있어서, 상기 저장탱크로부터 배출되는 증발가스를 다단계로 압축시키는 다수개의 압축기; 상기 다수개의 압축기 후단에 각각 설치되어 증발가스의 온도를 낮추는 다수개의 냉각기; 상기 다수개의 압축기에 의해 압축된 증발가스와 상기 저장탱크로부터 배출되는 증발가스를 열교환시키는 자가열교환기; 상기 자가열교환기를 통과한 압축된 증발가스의 압력을 낮추는 감압장치; 상기 감압장치를 통과하며 재액화된 증발가스와 기체상태의 증발가스를 분리하는 기액분리기; 및 상기 자가열교환기 및 상기 감압장치를 통과한 증발가스를 우회시켜 상기 저장탱크로 바로 보내는 우회라인;을 포함하는, 선박용 증발가스 재액화 장치가 제공된다.According to an aspect of the present invention, there is provided a liquefaction apparatus using a vaporized gas as a cooling fluid to re-liquefy a vapor generated in a liquefied natural gas storage tank installed in a ship, A plurality of compressors for compressing the discharged evaporative gas in a multistage manner; A plurality of coolers installed downstream of the plurality of compressors to lower the temperature of the evaporated gas; A self-heat exchanger for exchanging heat between the evaporated gas compressed by the plurality of compressors and the evaporated gas discharged from the storage tank; A pressure reducing device for lowering the pressure of the compressed evaporative gas passing through the self heat exchanger; A gas-liquid separator for separating the re-liquefied evaporated gas and the gaseous evaporated gas through the decompression device; And a detour line bypassing the self-heat exchanger and the evaporating gas passing through the decompressor and directly sending the detour gas to the storage tank.

상기 다수개의 압축기 중 일부 압축기만을 통과한 증발가스의 일부를 DF엔진으로 보낼 수 있다.A portion of the evaporated gas that has passed through only some compressors among the plurality of compressors may be sent to the DF engine.

상기 다수개의 압축기 중 일부 압축기만을 통과한 증발가스의 일부를 가스연소장치로 보낼 수 있다.A part of the evaporated gas passing through only a part of the plurality of compressors may be sent to the gas combustion apparatus.

상기 다수개의 압축기를 모두 통과한 증발가스의 일부는 ME-GI엔진에 공급하고, 나머지 일부는 상기 자가열교환기로 보낼 수 있다.A part of the evaporated gas passing through all of the plurality of compressors may be supplied to the ME-GI engine, and the remaining part may be sent to the self heat exchanger.

상기 목적을 달성하기 위한 본 발명의 다른 측면에 따르면, 선박에 설치된 액화천연가스 저장탱크에서 발생하는 증발가스를 재액화하기 위하여 증발가스를 냉각 유체로 사용하는 재액화 방법에 있어서, 상기 저장탱크로부터 배출된 증발가스는 압축된 후, 상기 저장탱크로부터 배출된 증발가스와 열교환되고, 상기 압축된 후 열교환 된 증발가스는 감압되어 일부가 재액화되고, 상기 일부 재액화된 증발가스와 기체상태로 남아있는 증발가스는 분리되거나, 분리되지 않고 함께 상기 저장탱크로 되돌려 보내지는, 선박용 증발가스 재액화 방법이 제공된다.According to another aspect of the present invention, there is provided a method of re-liquefaction using evaporative gas as a cooling fluid for re-liquefying evaporative gas generated in a liquefied natural gas storage tank installed in a ship, The discharged evaporated gas is compressed and then heat-exchanged with the evaporated gas discharged from the storage tank, and the compressed and heat-exchanged evaporated gas is decompressed to partially re-liquefy, and remains in the gaseous state with the partially re-liquefied evaporated gas And the evaporated gas is returned to the storage tank together without being separated or separated.

상기 일부 재액화된 증발가스와 기체상태로 남아있는 증발가스가 분리되는 경우, 상기 일부 재액화된 증발가스는 가압된 후 저장탱크로 되돌려 보내질 수 있고, 상기 기체상태로 남아있는 증발가스는, 상기 저장탱크로부터 배출된 후 압축된 증발가스와 열교환될 수 있다.When the partially re-liquefied evaporated gas and the remaining evaporated gas in a gaseous state are separated, the partially re-liquefied evaporated gas may be returned to the storage tank after being pressurized, and the remaining evaporated gas in the gaseous state And may be heat exchanged with the compressed evaporated gas after being discharged from the storage tank.

본 발명의 선박용 증발가스 재액화 장치 및 방법에 의하면, 기액분리기를 우회하여 재액화된 증발가스와 기체상태의 증발가스를 함께 저장탱크로 보낼 수 있으므로, 증발가스의 질소 비율이 높아지는 현상을 억제할 수 있고, 증발가스의 재액화 효율을 높일 수 있다.According to the apparatus and method for liquefaction of marine vaporized gas for ship according to the present invention, it is possible to bypass the gas-liquid separator to send the re-liquefied evaporated gas and the gaseous vaporized gas together to the storage tank, And the efficiency of re-liquefaction of the evaporated gas can be increased.

또한, 본 발명의 선박용 증발가스 재액화 장치 및 방법에 의하면, 기액분리기를 우회하여 재액화된 증발가스와 기체상태의 증발가스를 함께 저장탱크로 보낼 수 있으므로, 저장탱크로 보내진 기체상태의 증발가스가 저장탱크 내부의 액화천연가스와 접촉하면서 일부 재액화될 수 있어, 증발가스의 재액화 효율을 높일 수 있다.In addition, according to the apparatus and method for liquefaction of marine vaporized gas for ship according to the present invention, the evaporated gas re-liquefied bypassing the gas-liquid separator and the gaseous vaporized gas can be sent together to the storage tank, Can be partly re-liquefied while being in contact with the liquefied natural gas inside the storage tank, and the efficiency of re-liquefaction of the evaporated gas can be increased.

도 1은 본 발명의 바람직한 실시예에 따른 선박용 증발가스 재액화 장치의 개략적인 구성도이다.
도 2는 본 발명의 바람직한 실시예에 따른 선박용 증발가스 재액화 방법의 개략적인 흐름도이다. 1 is a schematic block diagram of an evaporative gas re-liquefaction apparatus for a ship according to a preferred embodiment of the present invention.
FIG. 2 is a schematic flowchart of a method for liquefying a ship evaporative gas according to a preferred embodiment of the present invention.

이하 첨부한 도면을 참조하여 본 발명의 바람직한 실시예에 대한 구성 및 작용을 상세히 설명하면 다음과 같다. 본 발명의 선박용 증발가스 재액화 장치 및 방법은 액화천연가스 화물창이 설치되는 선박 및 육상에서 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 apparatus and method for liquefying the vaporized gas for ship according to the present invention can be applied to various applications on ships equipped with liquefied natural gas cargo holds and onshore. 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.

도 1은 본 발명의 바람직한 실시예에 따른 선박용 증발가스 재액화 장치의 개략적인 구성도이다.1 is a schematic block diagram of an evaporative gas re-liquefaction apparatus for a ship according to a preferred embodiment of the present invention.

도 1을 참조하면, 본 실시예의 선박용 증발가스 재액화 장치는, 액화천연가스 저장탱크(100)로부터 배출되는 증발가스를 다단계로 압축시키는 다수개의 압축기(311, 312, 313, 314, 315); 다수개의 압축기(311, 312, 313, 314, 315) 후단에 각각 설치되어 증발가스의 온도를 낮추는 다수개의 냉각기(321, 322, 323, 324, 325); 다수개의 압축기(311, 312, 313, 314, 315)에 의해 압축된 증발가스와 저장탱크(100)로부터 배출되는 증발가스를 열교환시키는 자가열교환기(200); 자가열교환기(200)를 통과한 압축된 증발가스의 압력을 낮추는 감압장치(410); 액화된 증발가스와 기체상태의 증발가스를 분리하는 기액분리기(500); 및 자가열교환기(200) 및 감압장치(410)를 통과한 증발가스를 우회시켜 저장탱크(100)로 바로 보내는 우회라인(Bypass Line, 600);을 포함한다.Referring to FIG. 1, an evaporative gas re-liquefying apparatus for a ship according to the present embodiment includes a plurality of compressors 311, 312, 313, 314, and 315 for compressing evaporative gas discharged from a liquefied natural gas storage tank 100 in multiple stages; A plurality of coolers 321, 322, 323, 324, and 325 disposed downstream of the plurality of compressors 311, 312, 313, 314, and 315 to lower the temperature of the evaporation gas; An autothermal exchanger 200 for exchanging heat between the evaporated gas compressed by the plurality of compressors 311, 312, 313, 314, and 315 and the evaporated gas discharged from the storage tank 100; A pressure reducing device (410) for lowering the pressure of the compressed evaporative gas passing through the self heat exchanger (200); A gas-liquid separator (500) for separating the liquefied evaporated gas and the gaseous evaporated gas; And a bypass line 600 bypassing the evaporated gas that has passed through the autothermal exchanger 200 and the decompression device 410 and directly sending the evaporated gas to the storage tank 100.

본 실시예의 액화천연가스 저장탱크(100)는, 액화천연가스를 보관하며, 외부에서 전달되는 열에 의해 액화천연가스가 기화되어 생성되는 증발가스를 일정 압력 이상이 되면 외부로 배출시킨다. 본 실시예의 액화천연가스 저장탱크(100)는 다수개 설치될 수 있다.The liquefied natural gas storage tank 100 of the present embodiment stores liquefied natural gas and discharges the evaporated gas generated by vaporization of the liquefied natural gas by heat transmitted from the outside to the outside when the pressure exceeds a predetermined pressure. A plurality of liquefied natural gas storage tanks 100 of this embodiment can be installed.

본 실시예의 다수개의 압축기(311, 312, 313, 314, 315)는 액화천연가스 저장탱크(100)로부터 배출된 증발가스를 다단계로 압축시킨다. 압축된 증발가스의 일부는 엔진의 연료로 사용되고 일부는 재액화되어 다시 저장탱크(100)로 돌려보내진다. 본 실시예에서는 다섯 개의 압축기(311, 312, 313, 314, 315)를 포함하여, 다섯 단계의 압축과정을 거치는 것을 예를 들어 설명하였으나, 압축기의 개수가 한정되는 것은 아니다.The plurality of compressors 311, 312, 313, 314, and 315 of this embodiment compresses the evaporated gas discharged from the liquefied natural gas storage tank 100 in a multistage manner. Some of the compressed evaporated gas is used as fuel for the engine, and some is re-liquefied and returned to the storage tank 100. In the present embodiment, five compressors including 311, 312, 313, 314 and 315 have been described. However, the number of compressors is not limited.

본 실시예의 다수개의 냉각기(321, 322, 323, 324, 325)는, 다수개의 압축기(311, 312, 313, 314, 315) 후단에 각각 설치되어, 압축기(311, 312, 313, 314, 315)를 통과한 후 압력뿐만 아니라 온도가 올라간 증발가스의 온도를 낮춘다.The plurality of coolers 321, 322, 323, 324, and 325 of the present embodiment are installed at the downstream ends of the compressors 311, 312, 313, 314, ), And then lowers the temperature of the evaporated gas as well as the pressure.

일부 압축과정, 일례로 세 번의 압축과정을 거친 증발가스의 일부는 DF엔진에 공급된다. 또한, 다섯 번의 압축과정을 모두 거친 증발가스의 일부는 고압의 천연가스를 연료로 사용하는 ME-GI엔진에 공급되고, 다섯 번의 압축과정을 모두 거친 증발가스의 나머지 일부는 자가열교환기(200)로 보내진다.Some of the compression process, for example a portion of the evaporative gas that has undergone three compression processes, is fed to the DF engine. A part of the evaporation gas that has undergone the five compression processes is supplied to the ME-GI engine using high-pressure natural gas as fuel. The remaining part of the evaporation gas that has undergone the five compression processes is supplied to the self heat exchanger 200, Lt; / RTI >

엔진이 필요로 하는 연료의 양에 비하여 저장탱크(100)에서 발생되는 증발가스의 양이 너무 많은 경우에는, 일부 압축과정, 일례로 세 번의 압축과정을 거친 증발가스의 일부를 가스연소장치(GCU; Gas Combustion Unit)로 보내 연소시킬 수 있다.When the amount of the evaporative gas generated in the storage tank 100 is excessively larger than the amount of the fuel required by the engine, a part of the evaporative gas that has undergone some compression process, for example, three compression processes, ; Gas Combustion Unit).

일부 압축과정을 거친 증발가스를 DF엔진으로 보내는 라인 및 가스연소장치로 보내는 라인 상에는, 유량을 조절하는 밸브(420) 및 감압장치(410)가 설치될 수 있다. 감압장치(410)는 팽창기 또는 팽창밸브일 수 있다.A valve 420 and a pressure reducing device 410 for controlling the flow rate may be installed on the line for sending the evaporated gas, which has undergone some compression process, to the DF engine and the line for sending the gas to the gas combustion apparatus. Decompression device 410 may be an inflator or an expansion valve.

본 실시예의 자가열교환기(200)는, 액화천연가스 저장탱크(100)로부터 배출된 대략 상압, -160℃ 상태의 증발가스를, 다수개의 압축기(311, 312, 313, 314, 315)에 의해 압축된 증발가스와 열교환 시킨다. 자가열교환기(200)의 자가(Self-)는 저온의 증발가스 자체를 냉각 유체로 이용하여 고온의 증발가스와 열교환 시킨다는 의미를 가진다.The self-heat exchanger 200 of this embodiment is configured so that the evaporation gas at about atmospheric pressure and -160 ° C discharged from the liquefied natural gas storage tank 100 is discharged by the plurality of compressors 311, 312, 313, 314 and 315 Heat exchange with compressed evaporative gas. Self-heating of the self-heat exchanger 200 means that the low-temperature evaporation gas itself is used as a cooling fluid to exchange heat with the high-temperature evaporation gas.

본 실시예의 감압장치(410)는, 저장탱크(100)로부터 배출된 후 다수개의 압축기(311, 312, 313, 314, 315) 및 자가열교환기(200)를 통과한 증발가스의 압력을 대략 상압 근처까지 낮춘다. 감압장치(410)는 팽창밸브 또는 팽창기일 수 있다.The decompression apparatus 410 of the present embodiment compresses the pressure of the evaporated gas that has passed through the plurality of compressors 311, 312, 313, 314, and 315 and the self heat exchanger 200 after being discharged from the storage tank 100, Lower it to the neighborhood. The pressure reducing device 410 may be an expansion valve or an expander.

본 실시예의 기액분리기(500)는, 자가열교환기(200) 및 감압장치(410)를 지나면서 일부 재액화된 증발가스와 액화되지 않고 기체상태로 남은 증발가스를 분리하여, 액화된 증발가스는 저장탱크(100)로 돌려보내고, 기체상태의 증발가스는 저장탱크(100)로부터 배출되는 증발가스와 함께 다시 자가열교환기(200)로 보낸다.The gas-liquid separator 500 of this embodiment separates the partially re-liquefied evaporated gas from the evaporated gas remaining in the gaseous state without being liquefied by passing through the self-heat exchanger 200 and the decompressor 410, And returned to the storage tank 100, and the gaseous evaporated gas is sent back to the autothermal exchanger 200 together with the evaporated gas discharged from the storage tank 100.

기액분리기(500)로부터 기체상태의 증발가스를 자가열교환기(200)로 보내는 라인 상에는 감압장치(410)가 설치되어, 기액분리기(500)로부터 분리된 기체상태의 증발가스의 압력이 저장탱크(100)로부터 배출되는 증발가스의 압력과 유사하도록 조절할 수 있다. 감압장치(410)는 팽창기 또는 팽창밸브일 수 있다.A decompression device 410 is provided on the line for sending the gaseous vaporized gas from the gas-liquid separator 500 to the autothermal exchanger 200 so that the pressure of the gaseous vaporized gas separated from the gas- 100 of the evaporation gas. Decompression device 410 may be an inflator or an expansion valve.

자가열교환기(200)로부터 기액분리기(500)로 증발가스를 보내는 라인 상에는 유량을 조절하는 밸브(420)가 설치될 수 있다.A valve 420 for controlling the flow rate may be installed on the line for sending the evaporative gas from the self heat exchanger 200 to the gas-liquid separator 500.

본 실시예의 우회라인(600)은, 일측은 자가열교환기(200)와 기액분리기(500)를 연결하는 라인과 연결되고, 타측은 기액분리기(500)와 저장탱크(100)를 연결하는 라인과 연결된다. 우회라인(600)은, 다수개의 압축기(311, 312, 313, 314, 315)에 의해 압축된 후 자가열교환기(200) 및 감압장치(410)를 통과한 증발가스를 기액분리기(500)로 보내지 않고 우회시켜, 재액화된 증발가스와 기체상태의 증발가스를 함께 저장탱크(100)로 바로 보낸다.The bypass line 600 of this embodiment is connected to the line connecting the self heat exchanger 200 and the gas-liquid separator 500 and the other is connected to the line connecting the gas-liquid separator 500 and the storage tank 100, . The bypass line 600 is connected to the gas-liquid separator 500 after being compressed by the plurality of compressors 311, 312, 313, 314 and 315 and then passing through the self-heat exchanger 200 and the decompression device 410 Bypasses without sending, and sends the re-liquefied evaporated gas and the gaseous evaporated gas together directly to the storage tank 100.

다수개의 압축기(311, 312, 313, 314, 315)에 의해 압축된 후 자가열교환기(200) 및 감압장치(410)를 통과하며, 일부 재액화된 증발가스와 기체상태로 남아 있는 증발가스를 기액분리기(500)가 분리하는 과정에서, 메탄 비율이 낮아지고 질소 비율이 높아진 기체상태의 증발가스가 자가열교환기(200)로 보내진다. 질소 비율이 높아진 기체상태의 증발가스는 재액화 효율을 낮추는 원인이 되는데, 재액화된 증발가스와 기체상태로 남아있는 증발가스를 바로 저장탱크(100)로 보내게 되면 기체상태의 증발가스의 질소 비율이 높아지는 현상을 완화할 수 있다. 저장탱크(100)의 부피는 기액분리기(500)의 부피보다 더 크므로, 저장탱크(100) 부피 대비 질소의 양이 기액분리기(500) 부피 대비 질소의 양보다 더 적어지기 때문이다.Is compressed by a plurality of compressors (311, 312, 313, 314, 315) and then passes through the self heat exchanger (200) and the decompression device (410), and a part of the liquefied evaporated gas and the remaining evaporated gas In the process of separating the gas-liquid separator 500, the gaseous evaporated gas having a low methane ratio and a high nitrogen ratio is sent to the self-heat exchanger 200. The evaporated gas in a gaseous state having a high nitrogen ratio causes a decrease in the re-liquefaction efficiency. When the re-liquefied evaporated gas and the remaining gaseous evaporated gas are directly sent to the storage tank 100, It is possible to alleviate the phenomenon that the ratio is increased. Since the volume of the storage tank 100 is larger than the volume of the gas-liquid separator 500, the amount of nitrogen relative to the volume of the storage tank 100 is smaller than the volume of the gas-liquid separator 500 volume.

본 실시예의 선박용 증발가스 재액화 장치는 우회라인(600)을 포함하므로, 재액화된 증발가스와 함께 저장탱크(100)로 보내진 기체상태의 증발가스가, 저장탱크(100) 내부의 액화천연가스와 접촉하면서 일부 재액화될 수 있으므로, 재액화 효율이 높아질 수 있다.Since the evaporative gas re-liquefying apparatus for vessels of this embodiment includes the bypass line 600, the gaseous evaporative gas sent to the storage tank 100 together with the re-liquefied evaporated gas flows into the liquefied natural gas The liquid can be partially re-liquefied, so that the re-liquefaction efficiency can be increased.

본 실시예의 우회라인(600) 상에는 증발가스의 유량을 조절하는 밸브(420)가 설치될 수 있다.
A valve 420 for controlling the flow rate of the evaporation gas may be installed on the bypass line 600 of the present embodiment.

도 2는 본 발명의 바람직한 실시예에 따른 선박용 증발가스 재액화 방법의 개략적인 흐름도이다. 단일선으로 된 화살표는 압축되지 않은 상태의 천연가스(또는 증발가스)의 흐름을 나타내고, 이중선으로 된 화살표는 압축된 상태의 천연가스(또는 증발가스)의 흐름을 나타내며, 점선으로 된 화살표는 액화천연가스의 흐름을 나타낸다. 또한, '저압'의 의미는 다수개의 압축기(311, 312, 313, 314, 315) 중 일부만을 통과한 상태를 의미하고, '고압'의 의미는 다수개의 압축기(311, 312, 313, 314, 315)를 모두 통과한 상태를 의미한다.FIG. 2 is a schematic flowchart of a method for liquefying a ship evaporative gas according to a preferred embodiment of the present invention. Arrows in a single line represent the flow of natural gas (or evaporation gas) in an uncompressed state, the double arrows represent the flow of natural gas (or vapor) in a compressed state, It represents the flow of natural gas. The term 'high pressure' means a state in which only a part of the plurality of compressors 311, 312, 313, 314 and 315 has passed, and 'high pressure' means a state in which a plurality of compressors 311, 312, 313, 314, 315) are all passed.

도 2를 참조하면, 저장탱크로부터 배출된 증발가스는(S100, 이하, '배출 증발가스'라고 한다.), 자가열교환기에서 다수개의 압축기에 의해 고압으로 압축된 증발가스(이하, '압축 증발가스'라고 한다.)와 열교환 된 후(S200), 다수개의 압축기에 의해 압축된다(S300).Referring to FIG. 2, the evaporated gas discharged from the storage tank is referred to as an 'evaporated gas' (hereinafter, referred to as 'discharged evaporated gas'), and evaporated gas compressed at a high pressure by a plurality of compressors in an autothermal exchanger (S200), and is compressed by a plurality of compressors (S300).

다수개의 압축기에 의해 저압으로 압축된 증발가스의 일부는 DF엔진(S310) 및 가스연소장치(S320)로 보내지고, 다수개의 압축기에 의해 고압으로 압축된 증발가스의 일부는 ME-GI엔진으로 보내지며(S330), 다수개의 압축기에 의해 고압으로 압축된 증발가스의 나머지 일부는 자가열교환기로 보내진다(S400).A part of the evaporated gas compressed at a low pressure by the plurality of compressors is sent to the DF engine S310 and the gas combustion apparatus S320 and a part of the evaporated gas compressed at a high pressure by the plurality of compressors is sent to the ME- (S330). The remaining part of the evaporated gas compressed by the plurality of compressors at high pressure is sent to the self heat exchanger (S400).

자가열교환기로 보내진 고압으로 압축된 증발가스는, 배출 증발가스와 열교환된 후(S200) 감압장치로 보내져 압력이 낮아진다(S500). 감압장치로 보내져 압력이 낮아진 증발가스는, 기액분리기로 보내지거나(S600), 기액분리기를 우회하여 바로 저장탱크로 보내진다(S700).The high-pressure evaporated gas sent to the self-heat exchanger is heat-exchanged with the discharged evaporated gas (S200) and sent to the decompressor to lower the pressure (S500). The evaporated gas, which has been sent to the decompression device and has a lowered pressure, is sent to the gas-liquid separator (S600), bypassed to the gas-liquid separator and sent directly to the storage tank (S700).

기액분리기로 보내진 증발가스는, 재액화된 증발가스와 기체상태의 증발가스가 분리되어(S600), 재액화된 증발가스는 저장탱크로 보내지고(S610), 기체상태의 증발가스는 자가열교환기로 보내진다(S620).The re-liquefied evaporated gas and the gaseous evaporated gas are separated (S600), and the re-liquefied evaporated gas is sent to the storage tank (S610). The evaporated gas in the gaseous state is sent to the self-heat exchanger (S620).

기액분리기를 우회하여 바로 저장탱크로 보내진 증발가스는(S700), 재액화된 증발가스와 기체상태의 증발가스가 섞인 상태로 저장탱크로 보내지게 된다.
The evaporated gas bypassed the gas-liquid separator and immediately sent to the storage tank (S700) is sent to the storage tank in a mixed state of the re-liquefied evaporated gas and the gaseous evaporated gas.

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 : 액화천연가스 저장탱크 200 : 자가열교환기
311, 312, 313, 314, 315 : 압축기
321, 322, 323, 324, 325 : 냉각기
410 : 감압장치 420 : 밸브
500 : 기액분리기 600 : 우회라인100: liquefied natural gas storage tank 200: self-heat exchanger
311, 312, 313, 314, 315: compressors
321, 322, 323, 324, 325:
410: Pressure reducing device 420: Valve
500: gas-liquid separator 600: bypass line

Claims (6)

선박에 설치된 액화천연가스 저장탱크에서 발생하는 증발가스를 재액화하기 위하여 증발가스를 냉각 유체로 사용하는 재액화 장치에 있어서,
상기 저장탱크로부터 배출되는 증발가스를 다단계로 압축시키는 다수개의 압축기;
상기 다수개의 압축기 후단에 각각 설치되어 증발가스의 온도를 낮추는 다수개의 냉각기;
상기 다수개의 압축기에 의해 압축된 증발가스와 상기 저장탱크로부터 배출되는 증발가스를 열교환시키는 자가열교환기;
상기 자가열교환기를 통과한 압축된 증발가스의 압력을 낮추는 감압장치;
상기 감압장치를 통과하며 재액화된 증발가스와 기체상태의 증발가스를 분리하는 기액분리기; 및
상기 자가열교환기 및 상기 감압장치를 통과한 증발가스를 우회시켜 상기 저장탱크로 바로 보내는 우회라인;
을 포함하는, 선박용 증발가스 재액화 장치.1. A re-liquefying device for use as an evaporating gas as a cooling fluid for re-liquefying evaporated gas generated in a liquefied natural gas storage tank installed in a ship,
A plurality of compressors for compressing the evaporated gas discharged from the storage tank in a multistage manner;
A plurality of coolers installed downstream of the plurality of compressors to lower the temperature of the evaporated gas;
A self-heat exchanger for exchanging heat between the evaporated gas compressed by the plurality of compressors and the evaporated gas discharged from the storage tank;
A pressure reducing device for lowering the pressure of the compressed evaporative gas passing through the self heat exchanger;
A gas-liquid separator for separating the re-liquefied evaporated gas and the gaseous evaporated gas through the decompression device; And
A bypass line bypassing the self-heat exchanger and the evaporation gas passing through the decompression device and directly sending the evaporated gas to the storage tank;
And the evaporation gas re-liquefying device. 청구항 1에 있어서,
상기 다수개의 압축기 중 일부 압축기만을 통과한 증발가스의 일부를 DF엔진으로 보내는, 선박용 증발가스 재액화 장치.The method according to claim 1,
And a part of the evaporated gas that has passed through only some compressors among the plurality of compressors is sent to the DF engine. 청구항 1에 있어서,
상기 다수개의 압축기 중 일부 압축기만을 통과한 증발가스의 일부를 가스연소장치로 보내는, 선박용 증발가스 재액화 장치.The method according to claim 1,
Wherein a part of the evaporated gas that has passed through only some compressors among the plurality of compressors is sent to the gas combustion device. 청구항 1에 있어서,
상기 다수개의 압축기를 모두 통과한 증발가스의 일부는 ME-GI엔진에 공급하고, 나머지 일부는 상기 자가열교환기로 보내는, 선박용 증발가스 재액화 장치.The method according to claim 1,
Wherein a portion of the evaporated gas that has passed through all of the plurality of compressors is supplied to the ME-GI engine and the remaining portion is sent to the self heat exchanger. 선박에 설치된 액화천연가스 저장탱크에서 발생하는 증발가스를 재액화하기 위하여 증발가스를 냉각 유체로 사용하는 재액화 방법에 있어서,
상기 저장탱크로부터 배출된 증발가스는 압축된 후, 상기 저장탱크로부터 배출된 증발가스와 열교환되고,
상기 압축된 후 열교환 된 증발가스는 감압되어 일부가 재액화되고,
상기 일부 재액화된 증발가스와 기체상태로 남아있는 증발가스는 분리되거나, 분리되지 않고 함께 상기 저장탱크로 되돌려 보내지는, 선박용 증발가스 재액화 방법.A method for re-liquefaction using evaporative gas as a cooling fluid for re-liquefying evaporative gas generated in a liquefied natural gas storage tank installed in a ship,
The evaporated gas discharged from the storage tank is compressed and then heat-exchanged with the evaporated gas discharged from the storage tank,
The compressed and evaporated gas that has undergone the heat exchange is decompressed to partially re-liquefy,
Wherein the partially re-liquefied evaporated gas and the remaining evaporated gas in a gaseous state are separated or returned to the storage tank together without being separated. 청구항 5에 있어서,
상기 일부 재액화된 증발가스와 기체상태로 남아있는 증발가스가 분리되는 경우,
상기 일부 재액화된 증발가스는 가압된 후 저장탱크로 되돌려 보내지고,
상기 기체상태로 남아있는 증발가스는, 상기 저장탱크로부터 배출된 후 압축된 증발가스와 열교환되는, 선박용 증발가스 재액화 방법.The method of claim 5,
When the partly re-liquefied evaporated gas and the remaining evaporated gas in the gaseous state are separated,
The partially re-liquefied evaporated gas is returned to the storage tank after being pressurized,
Wherein the evaporated gas remaining in the gaseous state is heat-exchanged with the compressed evaporated gas after being discharged from the storage tank.
KR1020150038052A 2015-03-19 2015-03-19 BOG Re-liquefaction Apparatus and Method for Vessel KR20160112389A (en)

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WO2018206510A1 (en) * 2017-05-12 2018-11-15 Gaztransport Et Technigaz Device and method for cooling liquefied gas and/or natural boil-off gas from liquefied gas
KR102184961B1 (en) * 2020-07-13 2020-12-02 스칸젯매크론 주식회사 Boiled Off Gas Handling System
KR102455320B1 (en) * 2021-07-21 2022-10-17 대우조선해양 주식회사 Reliquefaction system of lpg and vessel including the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018206510A1 (en) * 2017-05-12 2018-11-15 Gaztransport Et Technigaz Device and method for cooling liquefied gas and/or natural boil-off gas from liquefied gas
FR3066250A1 (en) * 2017-05-12 2018-11-16 Gaztransport Et Technigaz DEVICE AND METHOD FOR COOLING LIQUEFIED GAS AND / OR NATURAL EVAPORATION GAS FROM LIQUEFIED GAS
CN109312897A (en) * 2017-05-12 2019-02-05 气体运输技术公司 For to liquefied gas and/or the spontaneous vaporization gas from liquefied gas carries out cooling device and method
KR102184961B1 (en) * 2020-07-13 2020-12-02 스칸젯매크론 주식회사 Boiled Off Gas Handling System
KR102455320B1 (en) * 2021-07-21 2022-10-17 대우조선해양 주식회사 Reliquefaction system of lpg and vessel including the same

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