KR20110042910A - Reliquefaction apparatus of a liquified natural gas carrier - Google Patents

Reliquefaction apparatus of a liquified natural gas carrier Download PDF

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KR20110042910A
KR20110042910A KR1020090099780A KR20090099780A KR20110042910A KR 20110042910 A KR20110042910 A KR 20110042910A KR 1020090099780 A KR1020090099780 A KR 1020090099780A KR 20090099780 A KR20090099780 A KR 20090099780A KR 20110042910 A KR20110042910 A KR 20110042910A
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gas
boil
liquefied
cargo tank
reliquefaction
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KR1020090099780A
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Korean (ko)
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KR101191241B1 (en
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신현준
유진열
류승각
김남수
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대우조선해양 주식회사
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
    • B63J2/12—Heating; Cooling
    • B63J2/14—Heating; Cooling of liquid-freight-carrying tanks
    • 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
    • F17C6/00—Methods and apparatus for filling vessels not under pressure with liquefied or solidified gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • 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
    • F17C2227/0157—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
    • F17C2265/034—Treating the boil-off by recovery with cooling with condensing the gas phase
    • 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
    • F17C2265/06—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

PURPOSE: A boil-off gas reliquefaction apparatus of a liquefied natural gas carrier is provided to reduce the amount of produced flash gases by allowing reliquefied boil-off gases to bypass a separator and be used as fuel. CONSTITUTION: A boil-off gas reliquefaction apparatus of a liquefied natural gas carrier comprises a reliquefaction unit(130), a separator(140), a re-condenser(150), and a boil-off gas fuel line(160). The reliquefaction unit reliquefies boil-off gas that is discharged from a cargo tank, compressed and cooled. The separator separates flash gas from the reliquefied boil-off gas supplied to the cargo tank. The re-condenser re-condenses boil-off gas through heat exchange with the liquefied gas discharged from the cargo tank so that the boil-off gas can be used as fuel for an engine. The boil-off gas fuel line transfers the liquefied boil-off gas so that the liquefied boil-off gas bypasses the separator and is used as fuel for the engine.

Description

액화가스 수송선의 증발가스 재액화 장치{Reliquefaction apparatus of a liquified natural gas carrier}Reliquefaction apparatus of a liquified natural gas carrier

본 발명은 액화가스 수송선의 증발가스 재액화 장치에 관한 것으로서, 플래쉬 가스(Flash gas)의 발생량과 파워 소모(Power consumption)를 줄일 수 있는 액화가스 수송선의 증발가스 재액화 장치에 관한 것이다.The present invention relates to an apparatus for re-liquefied evaporation gas of a liquefied gas transporter, and to an apparatus for re-liquefied evaporative gas of a liquefied gas transporter capable of reducing the amount of flash gas generated and power consumption.

일반적으로 액화가스 수송선(Liquified natural gas carrier)은 액화된 천연가스를 수송하기 위한 선박으로서 고도의 건조 기술이 요구되는 고부가가치를 가지는 특수한 선박이다. In general, a liquefied natural gas carrier (Liquified natural gas carrier) is a special ship with a high value added that requires a high degree of drying technology as a ship for transporting liquefied natural gas.

최근에는 지구온난화에 따른 각종 기후 협약과 이산화탄소 발생량 규제가 심해짐에 따라 청정에너지인 천연가스에 대한 수요가 늘어나고 있으며, 이로 인해 세계 각국과 LNG 주요 생산국가인 동남아, 중동, 북아프리카 등을 연결하도록 하는 액화가스 수송선의 수요증가가 예상된다. Recently, as the climate agreement and the regulation of carbon dioxide generation are becoming more severe due to global warming, the demand for natural gas, which is clean energy, is increasing. As a result, there is a need to connect the world's major LNG producing countries such as Southeast Asia, the Middle East, and North Africa. Demand for liquefied gas carriers is expected to increase.

이러한 액화가스 수송선은 운항 중 자연 기화되는 증발가스(Boil Off Gas: BOG)를 다시 액화시켜서 카고 탱크(Cargo tank)로 되돌려 보내기 위한 재액화장치를 가지고 있다. The liquefied gas transport ship has a reliquefaction apparatus for liquefying boil off gas (BOG), which is naturally vaporized during operation, and returning it back to a cargo tank.

도 1은 종래의 기술에 따른 액화가스 수송선의 증발가스 재액화 장치를 도시한 구성도이다. 도 1에 도시된 바와 같이, 종래의 기술에 따른 액화가스 수송선의 증발가스 재액화 장치(10)는 카고 탱크(1)로부터 배출되는 증발가스를 압축시키는 압축기(12)와, 압축기(12)에 의해 압축된 증발가스를 냉각시키는 쿨러(13)와, 쿨러(13)에 의해 냉각된 증발가스를 재액화시키는 재액화 유닛(14)과, 재액화 유닛(14)에 의해 재액화된 증발가스로부터 플래쉬 가스를 분리하여 액상의 증발가스를 카고 탱크(1)에 공급되도록 하는 세퍼레이터(15)를 포함한다.1 is a block diagram showing a boil-off gas reliquefaction apparatus of the liquefied gas transport ship according to the prior art. As shown in FIG. 1, the apparatus for re-liquefying the boil-off gas 10 of the liquefied gas transport vessel according to the related art includes a compressor 12 for compressing the boil-off gas discharged from the cargo tank 1 and a compressor 12. A cooler 13 for cooling the boil-off gas compressed by the liquid, a reliquefaction unit 14 for liquefying the boil-off gas cooled by the cooler 13, and a flash from the boil-off gas liquefied by the re-liquefaction unit 14 Separator 15 to separate the gas to supply the liquid vaporized gas to the cargo tank (1).

이와 같은 종래의 액화가스 수송선의 증발가스 재액화 장치(10)는, 재액화 유닛(14)에 의해 재액화된 증발가스를 세퍼레이터(15)에 공급하여 가벼운 질소와 메탄성분 중 일부(응축되지 않은 기체상태의 메탄 등)를 제거한 후, 포화상태의 응축물(즉, 재액화된 BOG)만을 인슐레이션(Insulation) 처리된 응축 회수 라인(Condensate return line)을 통해 카고 탱크(1)에 공급한다.The conventional boil-off gas reliquefaction apparatus 10 of the liquefied gas transport vessel supplies the boil-off gas re-liquefied by the re-liquefaction unit 14 to the separator 15 so that some of the light nitrogen and methane components (not condensed) After the gaseous methane is removed, only saturated condensate (ie, reliquefied BOG) is supplied to the cargo tank 1 through an insulated condensate return line.

종래의 기술에 따른 액화가스 수송선의 증발가스 재액화 장치는, 재액화된 증발가스가 카고 탱크로 리턴되는 도중에 열의 유입이나 압력 강하가 발생하여 플래쉬 가스가 발생하는 문제점을 가지고 있다. 즉, 플래쉬 가스가 카고 탱크로 리턴됨으로써 재액화에 필요한 에너지 소모를 증가시키는 원인이 되었다.The evaporative gas reliquefaction apparatus of the liquefied gas transport ship according to the prior art has a problem in that flash gas is generated due to heat inflow or pressure drop occurring while the reliquefied evaporated gas is returned to the cargo tank. In other words, the return of the flash gas to the cargo tank caused the increase in energy consumption required for reliquefaction.

그러므로, 본 발명은 이러한 종래의 문제점을 해결하기 위하여, 재액화된 증발가스를 연료로 사용하도록 함으로써 플래쉬 가스의 발생량을 줄이고, 파워 소모를 감소시킬 수 있는 액화가스 수송선의 증발가스 재액화 장치를 제공하고자 하는 것이다.Therefore, in order to solve such a conventional problem, the present invention provides an evaporated gas reliquefaction apparatus of a liquefied gas transport ship which can reduce the amount of flash gas generated and reduce power consumption by using the reliquefied evaporated gas as a fuel. I would like to.

상기의 목적을 달성하기 위한 본 발명의 일 측면에 따르면, 액화가스 수송선의 증발가스 재액화 장치에 있어서, 카고 탱크로부터 배출되어 압축 및 냉각된 증발가스를 재액화시키는 재액화 유닛과; 상기 재액화 유닛에 의해 재액화되어 상기 카고 탱크로 공급되는 액화증발가스로부터 플래쉬 가스를 분리하는 세퍼레이터와; 상기 카고 탱크로부터 배출되는 액화가스와의 열교환에 의해 증발가스를 재응축시켜서 엔진의 연료로 사용되도록 하는 재응축기와; 상기 재액화 유닛에 의해 재액화된 액화증발가스가 상기 세퍼레이터를 바이패스하여 상기 엔진의 연료로 사용되도록, 상기 액화증발가스를 이송하는 증발가스 연료라인; 을 포함하는 것을 특징으로 하는 액화가스 수송선의 증발가스 재액화 장치가 제공된다.According to an aspect of the present invention for achieving the above object, the liquefied gas transport ship of the liquefied gas re-liquefaction apparatus, comprising: a re-liquefaction unit for re-liquefying the compressed and cooled boiled gas discharged from the cargo tank; A separator for re-liquefying by the reliquefaction unit to separate the flash gas from the liquefied evaporation gas supplied to the cargo tank; A recondenser for recondensing the boil-off gas by heat exchange with the liquefied gas discharged from the cargo tank to be used as a fuel of the engine; An evaporative gas fuel line configured to transfer the liquefied evaporation gas so that the liquefied evaporated gas re-liquefied by the reliquefaction unit bypasses the separator and is used as fuel of the engine; Evaporation gas re-liquefaction apparatus of the liquefied gas transport ship is provided comprising a.

상기 증발가스 연료라인은, 상기 재액화 유닛의 후단과 상기 재응축기를 연결하는 것이 바람직하다.The boil-off gas fuel line is preferably connected to the rear end of the reliquefaction unit and the recondenser.

상기 증발가스 재액화 장치는, 상기 카고 탱크로부터 배출되어 상기 재액화 유닛에 공급되는 증발가스를 압축시키는 증발가스 압축기(BOG compressor)를 포함하는 것이 바람직하다.The boil-off gas reliquefaction apparatus preferably includes a bog compressor (BOG compressor) for compressing the boil-off gas discharged from the cargo tank supplied to the re-liquefaction unit.

상기 엔진은 선박 추진용 ME-GI 엔진인 것이 바람직하다.The engine is preferably a ship propulsion ME-GI engine.

상기 증발가스 재액화 장치는, 상기 재액화 유닛의 상류측에 설치되어, 상기 카고 탱크로부터 배출되어 압축된 증발가스를, 상기 재응축기로부터 상기 엔진에 공급되는 액화가스와 열교환시켜 냉각시키기 위한 쿨러를 더 포함하는 것이 바람직하다.The boil-off gas reliquefaction apparatus is provided on an upstream side of the re-liquefaction unit and coolers for cooling the boil-off gas discharged from the cargo tank and compressed by heat exchange with the liquefied gas supplied from the recondenser to the engine. It is preferable to further include.

본 발명의 또 다른 측면에 따르면, 액화가스 수송선의 카고 탱크에서 발생하는 증발가스를 재액화하는 방법으로서, 카고 탱크로부터 증발가스를 배출시키는 단계와; 상기 카고 탱크로부터 배출된 증발가스를 재액화시키는 단계와; 재액화되어 상기 카고 탱크로 복귀되는 액화 증발가스 중 적어도 일부를 엔진의 연료로서 공급하는 단계; 를 포함하는 것을 특징으로 하는 액화가스 수송선의 증발가스 재액화 방법이 제공된다.According to still another aspect of the present invention, there is provided a method for reliquefying boil-off gas generated in a cargo tank of a liquefied gas transporter, comprising: discharging boil-off gas from a cargo tank; Reliquefying the boil-off gas discharged from the cargo tank; Supplying at least a portion of the liquefied boil-off gas re-liquefied and returned to the cargo tank as fuel for the engine; Provided is a method for re-liquefying an evaporated gas of a liquefied gas transport ship comprising a.

본 발명에 따른 액화가스 수송선의 증발가스 재액화 장치에 의하면, 재액화된 증발가스가 세퍼레이터(Separator)를 바이패스(By-pass)하여 연료로 사용되도록 함으로써 플래쉬 가스(Flash gas)의 발생량을 줄이고, 파워 소모(Power consumption)를 감소시키도록 한다.According to the liquefied gas re-liquefaction apparatus of the liquefied gas transporter according to the present invention, by reducing the amount of flash gas generated by the liquefied liquefied evaporated gas is used as a fuel by bypassing the separator (By-pass) To reduce power consumption.

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 상세히 설명하기로 한다. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

본 발명의 실시예는 당해 기술 분야에서 통상의 지식을 가진 자에게 본 발명을 더욱 완전하게 설명하기 위하여 제공되는 것이며, 하기 실시예는 여러 가지 다른 형태로 변형될 수 있으며, 본 발명의 범위가 하기 실시예에 한정되는 것은 아니다.The embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, and the following examples can be modified in various other forms, and the scope of the present invention is as follows. It is not limited to an Example.

도 2는 본 발명에 따른 액화가스 수송선의 증발가스 재액화 장치를 도시한 구성도이다. 도 2에 도시된 바와 같이, 본 발명의 액화가스 수송선의 증발가스 재액화 장치(100)는 카고 탱크(1)로부터 배출되어 압축 및 냉각된 증발가스를 재액화시키는 재액화 유닛(Reliquefaction unit: 130)과, 재액화 유닛(130)에 의해 재액화된 증발가스로부터 플래쉬 가스(Flash gas)를 분리하는 세퍼레이터(Separator: 140)와, 카고 탱크(1)의 LNG를 응축시켜서 연료로 사용되도록 하는 재응축기(Recondenser: 150)와, 재액화 유닛(130)에 의해 재액화된 증발가스를 연료로 사용되기 위해 이송시키는 증발가스 연료라인(160)을 포함한다.Figure 2 is a block diagram showing a boil-off gas reliquefaction apparatus of the liquefied gas transport ship according to the present invention. As shown in FIG. 2, the liquefied gas reliquefaction apparatus 100 of the liquefied gas transporter of the present invention is a reliquefaction unit 130 for liquefying the compressed and cooled boiled gas discharged from the cargo tank 1. And a separator (Separator 140) for separating the flash gas from the evaporated gas re-liquefied by the reliquefaction unit 130, and a recondenser for condensing LNG in the cargo tank 1 to be used as fuel. (Recondenser 150), and the boil-off gas fuel line 160 for transferring the boil-off gas re-liquefied by the re-liquefaction unit 130 for use as a fuel.

카고 탱크(1)로부터 배출된 증발가스를 압축 및 냉각시키기 위하여 압축기(Compressor: 110) 및 쿨러(Cooler: 120)가 각각 마련된다.A compressor 110 and a cooler 120 are respectively provided to compress and cool the boil-off gas discharged from the cargo tank 1.

압축기(110)는 카고 탱크(1)로부터 배출되는 증발가스가 액화되어 카고 탱크(1)로 리턴되도록 하는 재액화라인(171)에 설치되고, 카고 탱크(1)로부터 배출되 는 증발가스를 압축시킨다.The compressor 110 is installed in the reliquefaction line 171 to allow the boil-off gas discharged from the cargo tank 1 to be liquefied and returned to the cargo tank 1, and compresses the boil-off gas discharged from the cargo tank 1. Let's do it.

쿨러(120)는 재액화라인(171)에 설치되고, 압축기(110)에 의해 압축된 증발가스를 냉각시키되, 카고 탱크(1)로부터 연료공급라인(172)을 통해서 연료로 사용되기 위해 배출되는 저온의 LNG를 이용하여 증발가스를 냉각시킴으로써 증발가스의 액화에 소요되는 로드(Load)를 줄이도록 한다.The cooler 120 is installed in the reliquefaction line 171 and cools the boil-off gas compressed by the compressor 110, and is discharged from the cargo tank 1 for use as fuel through the fuel supply line 172. By cooling the boil off gas using a low temperature LNG to reduce the load (load) required to liquefy the boil off gas.

재액화 유닛(130)은 재액화라인(171)에 설치되고, 쿨러(120)에 의해 냉각된 증발가스를 재액화시키며, 증발가스가 응축되는 열교환기와 냉매를 순환시키는 N2 컴팬더(Compander)를 포함할 수 있다.The reliquefaction unit 130 is installed in the reliquefaction line 171, and reliquefies the evaporated gas cooled by the cooler 120, and an N 2 compander circulating a heat exchanger and a refrigerant in which the evaporated gas is condensed. It may include.

세퍼레이터(140)는 재액화라인(171)에 설치되고, 재액화 유닛(130)에 의해 재액화되어 카고 탱크(1)로 공급되는 증발가스로부터 플래쉬 가스를 분리함으로써 액상의 증발가스를 카고 탱크(1)에 공급되도록 한다. 세퍼레이터(140)에 의해 분리된 플래쉬 가스는 벤팅(Venting)되거나 연소기(GCU)로 보내어짐으로써 카고 탱크(1)에 열이 축적되는 것을 방지한다. 여기서, 재액화라인(171)은 세퍼레이터(140)의 전단과 후단에 재액화된 증발가스의 이동을 개폐시키는 밸브(171a,171b)가 설치된다.Separator 140 is installed in the reliquefaction line 171, the liquid liquefied by the reliquefaction unit 130 by separating the flash gas from the boil-off gas supplied to the cargo tank 1 cargo tank ( To 1). The flash gas separated by the separator 140 is vented or sent to the combustor GCU to prevent heat from accumulating in the cargo tank 1. Here, the reliquefaction line 171 is provided with valves (171a, 171b) for opening and closing the movement of the re-liquefied boil-off gas at the front and rear ends of the separator 140.

재응축기(150)는 카고 탱크(1)로부터 ME-GI 엔진 등과 같은 연료사용처로 LNG를 공급시키는 연료공급라인(172)에 설치되어 카고 탱크(1)로부터 배출되는 LNG를 응축시켜서 연료사용처에 필요한 연료로 사용되도록 하며, 카고 탱크(1)로부터 연료공급라인(172)을 통해서 공급되는 LNG나 증발가스 연료라인(160)으로부터 공급 되는 재액화된 증발가스를 응축한 다음, 연료로 사용되도록 공급한다. 여기서 연료공급라인(172)은 재응축기(150)의 전단에 밸브(172a)가 설치되며, 재응축기(150)의 후단에 연료를 약 250 barg로 승압하는 펌프(173)가 설치되며, 연료사용처로 공급되기 전의 연료를 기화시키도록 기화기(Vaporizer: 174)가 설치된다.The recondenser 150 is installed in a fuel supply line 172 for supplying LNG from the cargo tank 1 to a fuel destination such as a ME-GI engine, thereby condensing the LNG discharged from the cargo tank 1 to the fuel destination. It is to be used as a fuel, condensed LNG from the cargo tank 1 through the fuel supply line 172 or the reliquefied boiled gas supplied from the boil-off gas fuel line 160, and then supplied to be used as fuel . Here, the fuel supply line 172 is provided with a valve 172a at the front end of the recondenser 150, a pump 173 for boosting the fuel to about 250 barg at the rear end of the recondenser 150 is installed, Vaporizer 174 is installed to vaporize fuel before it is supplied to the furnace.

증발가스 연료라인(160)은, 재액화 유닛(130)에 의해 재액화된 액화증발가스 중 적어도 일부를, 세퍼레이터(140)를 바이패스하여 연료로 사용하기 위해 연료공급라인(172)으로 이송시킴으로써 플래쉬 가스(Flash gas)의 발생량을 줄이고, 파워 소모(Power consumption)를 감소시키도록 한다.The boil-off gas fuel line 160 transfers at least some of the liquefied evaporated gas re-liquefied by the reliquefaction unit 130 to the fuel supply line 172 to bypass the separator 140 and use it as fuel. The amount of flash gas generated is reduced and power consumption is reduced.

또한, 증발가스 연료라인(160)은 재액화 유닛(130)의 후단과 재응축기(150)를 연결시키도록 설치되며, 이로 인해 재액화 유닛(130)에 의해 재액화된 증발가스가 재응축기(150)로 공급되어 재응축됨으로써 연료로 사용되도록 한다.In addition, the boil-off gas fuel line 160 is installed to connect the rear end of the re-liquefaction unit 130 and the re-condenser 150, whereby the boil-off gas re-liquefied by the re-liquefaction unit 130 is recondenser ( 150 to be condensed and used as fuel.

이와 같은 본 발명에 따른 액화가스 수송선의 증발가스 재액화 장치의 작동을 설명하기로 하겠다.The operation of the boil-off gas reliquefaction apparatus of the liquefied gas transport ship according to the present invention will be described.

본 발명은 재액화 장치(100)가 탑재된 액화가스 수송선에서 극저온 매체의 처리가 가능한 증발가스 압축기(110)를 사용하여 넓은 범위의 증발가스 온도를 압축할 수 있는 프로세스를 기반으로 하고 있으며, 이를 통해 재액화 유닛(130)에 의해 재액화된 증발가스가 세퍼레이터(140)를 바이패스하여 과냉의 상태로 엔진 추진 등의 연료로 사용되도록 함으로써 플래쉬 가스의 발생량을 줄이고, 최소의 파워 소모(Power consumption)로 선박을 운용할 수 있도록 한다. 즉, 항해 시 발생하는 증발가스를 약 10 bara, -159℃로 재액화시킨 뒤, 세퍼레이터(140)를 바이패스하여 엔진 등으로 공급하는 구성을 적용함으로써 서브 쿨(Sub-cool) 상태의 액상 증발가스가 세퍼레이터(140)를 경유하지 않고서 증발가스 연료라인(160)을 통해서 연료공급라인(172)에 설치된 재응축기(150)로 보내지며, 이로 인해 플래쉬 가스의 발생을 막아 줌으로써 플래쉬 가스가 발생하지 않은 만큼의 재액화 파워가 소모되지 않도록 한다.The present invention is based on a process capable of compressing a wide range of boil-off gas temperature using the boil-off gas compressor 110 capable of treating cryogenic medium in a liquefied gas transport ship equipped with a re-liquefaction apparatus 100, which Through the evaporated gas re-liquefied by the re-liquefaction unit 130 to bypass the separator 140 to be used as fuel such as engine propulsion in a supercooled state to reduce the amount of flash gas generated, the minimum power consumption (Power consumption To operate the ship. That is, the liquid evaporation in the sub-cool state is applied by applying a configuration in which the vaporized gas generated during navigation is re-liquefied at about 10 bara and -159 ° C, and the separator 140 is bypassed and supplied to the engine. Gas is sent to the recondenser 150 installed in the fuel supply line 172 through the boil-off gas fuel line 160 without passing through the separator 140, thereby preventing the flash gas from being generated. Do not consume as much reliquefaction power as you do not want.

이와 같이, 본 발명의 상세한 설명에서는 구체적인 실시예에 관해서 설명하였으나, 본 발명의 기술적 사상을 벗어나지 않는 범위 내에서 여러 가지 변형이 가능함은 물론이다. 그러므로, 본 발명의 범위는 설명된 실시예에 국한되어 정해져서는 안되며, 후술하는 특허청구범위뿐만 아니라 이 청구범위와 균등한 것들에 의해 정해져야 한다.As described above, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the technical spirit of the present invention. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be defined by the appended claims and equivalents thereof.

도 1은 종래의 기술에 따른 액화가스 수송선의 증발가스 재액화 장치를 도시한 구성도.1 is a block diagram showing a boil-off gas reliquefaction apparatus of the liquefied gas transport ship according to the prior art.

도 2는 본 발명에 따른 액화가스 수송선의 증발가스 재액화 장치를 도시한 구성도.Figure 2 is a block diagram showing a boil-off gas reliquefaction apparatus of the liquefied gas transport ship according to the present invention.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

110 : 압축기 120 : 쿨러110: compressor 120: cooler

130 : 재액화 유닛 140 : 세퍼레이터130: reliquefaction unit 140: separator

150 : 재응축기 160 : 증발가스 연료라인150: recondenser 160: boil-off gas fuel line

171 : 재액화라인 171a,171b,172a : 밸브 171: reliquefaction line 171a, 171b, 172a: valve

172 : 연료공급라인 173 : 펌프172: fuel supply line 173: pump

174 : 기화기174: Carburetor

Claims (6)

액화가스 수송선의 증발가스 재액화 장치에 있어서, In the boil-off gas reliquefaction apparatus of the liquefied gas transport ship, 카고 탱크로부터 배출되어 압축 및 냉각된 증발가스를 재액화시키는 재액화 유닛과; A reliquefaction unit for reliquefying the compressed and cooled boil-off gas discharged from the cargo tank; 상기 재액화 유닛에 의해 재액화되어 상기 카고 탱크로 공급되는 액화증발가스로부터 플래쉬 가스를 분리하는 세퍼레이터와; A separator for re-liquefying by the reliquefaction unit to separate the flash gas from the liquefied evaporation gas supplied to the cargo tank; 상기 카고 탱크로부터 배출되는 액화가스와의 열교환에 의해 증발가스를 재응축시켜서 엔진의 연료로 사용되도록 하는 재응축기와; A recondenser for recondensing the boil-off gas by heat exchange with the liquefied gas discharged from the cargo tank to be used as a fuel of the engine; 상기 재액화 유닛에 의해 재액화된 액화증발가스가 상기 세퍼레이터를 바이패스하여 상기 엔진의 연료로 사용되도록, 상기 액화증발가스를 이송하는 증발가스 연료라인; An evaporative gas fuel line configured to transfer the liquefied evaporation gas so that the liquefied evaporated gas re-liquefied by the reliquefaction unit bypasses the separator and is used as fuel of the engine; 을 포함하는 것을 특징으로 하는 액화가스 수송선의 증발가스 재액화 장치.Evaporating gas reliquefaction apparatus of the liquefied gas transport ship comprising a. 청구항 1에 있어서, The method according to claim 1, 상기 증발가스 연료라인은, 상기 재액화 유닛의 후단과 상기 재응축기를 연결하는 것을 특징으로 하는 액화가스 수송선의 증발가스 재액화 장치.The boil-off gas fuel line, the boil-off gas reliquefaction apparatus of the liquefied gas transport line, characterized in that for connecting the rear end of the re-liquefaction unit and the recondenser. 청구항 1에 있어서, The method according to claim 1, 상기 카고 탱크로부터 배출되어 상기 재액화 유닛에 공급되는 증발가스를 압 축시키는 압축기를 더 포함하는 것을 특징으로 하는 액화가스 수송선의 증발가스 재액화 장치.And a compressor for compressing the boil-off gas discharged from the cargo tank and supplied to the re-liquefaction unit. 청구항 1에 있어서, The method according to claim 1, 상기 엔진은 선박 추진용 ME-GI 엔진인 것을 특징으로 하는 액화가스 수송선의 증발가스 재액화 장치.The engine is a boil-propelled ME-GI engine, characterized in that the boil-off gas reliquefaction apparatus of the liquefied gas transport ship. 청구항 1에 있어서, The method according to claim 1, 상기 재액화 유닛의 상류측에 설치되어, 상기 카고 탱크로부터 배출되어 압축된 증발가스를, 상기 재응축기로부터 상기 엔진에 공급되는 액화가스와 열교환시켜 냉각시키기 위한 쿨러를 더 포함하는 것을 특징으로 하는 액화가스 수송선의 증발가스 재액화 장치.And a cooler installed upstream of the reliquefaction unit to cool down the evaporated gas discharged from the cargo tank and compressed with the liquefied gas supplied from the recondenser to the engine. Evaporative gas reliquefaction apparatus of gas transport ship. 액화가스 수송선의 카고 탱크에서 발생하는 증발가스를 재액화하는 방법으로서, As a method of re-liquefying the boil-off gas generated in the cargo tank of the liquefied gas transport ship, 카고 탱크로부터 증발가스를 배출시키는 단계와; Discharging the boil-off gas from the cargo tank; 상기 카고 탱크로부터 배출된 증발가스를 재액화시키는 단계와; Reliquefying the boil-off gas discharged from the cargo tank; 재액화되어 상기 카고 탱크로 복귀되는 액화 증발가스 중 적어도 일부를 엔진의 연료로서 공급하는 단계; Supplying at least a portion of the liquefied boil-off gas re-liquefied and returned to the cargo tank as fuel for the engine; 를 포함하는 것을 특징으로 하는 액화가스 수송선의 증발가스 재액화 방법.Evaporating gas reliquefaction method of the liquefied gas transport ship comprising a.
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