KR102066632B1 - BOG Re-liquefaction System and Method for Vessel - Google Patents

BOG Re-liquefaction System and Method for Vessel Download PDF

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KR102066632B1
KR102066632B1 KR1020170037834A KR20170037834A KR102066632B1 KR 102066632 B1 KR102066632 B1 KR 102066632B1 KR 1020170037834 A KR1020170037834 A KR 1020170037834A KR 20170037834 A KR20170037834 A KR 20170037834A KR 102066632 B1 KR102066632 B1 KR 102066632B1
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gas
boil
compressor
compressed
consumer
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KR1020170037834A
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Korean (ko)
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KR20180108283A (en
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황순규
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대우조선해양 주식회사
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Priority to KR1020170037834A priority Critical patent/KR102066632B1/en
Priority to PCT/KR2017/012577 priority patent/WO2018174364A1/en
Priority to CN201780088717.8A priority patent/CN110446656B/en
Priority to JP2019548324A priority patent/JP7128197B2/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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/004—Details of vessels or of the filling or discharging of vessels for large storage vessels not under pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • 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
    • 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
    • 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
    • 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

선박용 증발가스 재액화 시스템이 개시된다.
상기 선박용 증발가스 재액화 시스템은, 증발가스의 일부를 압축시키는 제2 압축기; 상기 제2 압축기로 보내지지 않은 나머지 증발가스를 냉매로 상기 제2 압축기에 의해 압축된 증발가스를 열교환시켜 냉각시키는 열교환기; 상기 열교환기에서 냉매로 사용된 증발가스를 압축시키는 제1 압축기; 및 상기 열교환기에 의해 냉각된 유체를 팽창시키는 감압장치;를 포함한다.A boil off gas reliquefaction system is disclosed.
The vessel boil-off liquefaction system, the second compressor for compressing a portion of the boil-off gas; A heat exchanger for cooling the remaining boil-off gas not sent to the second compressor by heat-exchanging the boil-off gas compressed by the second compressor with a refrigerant; A first compressor for compressing the boil-off gas used as the refrigerant in the heat exchanger; And a decompression device for expanding the fluid cooled by the heat exchanger.

Description

선박용 증발가스 재액화 시스템 및 방법{BOG Re-liquefaction System and Method for Vessel}BOG Re-liquefaction System and Method for Vessel

본 발명은 선박에 탑재된 저장탱크에서 발생하는 증발가스를 증발가스 자체를 냉매로 하여 재액화 시키는 시스템에 관한 것이다.The present invention relates to a system for reliquefying evaporated gas generated in a storage tank mounted on a vessel by using evaporated gas itself as a refrigerant.

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. Recently, the consumption of liquefied gas such as liquefied natural gas (Liquefied Natural Gas, LNG) is increasing worldwide. Liquefied gas liquefied gas at low temperature has the advantage that the storage and transport efficiency can be improved because the volume is very small compared to the gas. In addition, liquefied gas, including liquefied natural gas can remove or reduce air pollutants during the liquefaction process, it can be seen as an environmentally friendly fuel with less emissions of air pollutants during combustion.

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 and transparent liquid obtained by liquefying natural gas containing methane as a main component at about -162 ℃, and has a volume of about 1/600 compared with natural gas. Therefore, when liquefied and transported natural gas 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 ℃, liquefied natural gas is easily evaporated because it is sensitive to temperature changes. As a result, the storage tank storing the liquefied natural gas is insulated. However, since the external heat is continuously transferred to the storage tank, the natural gas is continuously vaporized in the storage tank during the transport of the liquefied natural gas. -Off Gas, BOG) occurs. The same 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.Boil-off gas is a kind of loss and is an important problem in transportation efficiency. In addition, when boil-off gas is accumulated in the storage tank, the internal pressure of the tank may be excessively increased, and there is also a risk that the tank may be damaged. Accordingly, various methods for treating the boil-off gas generated in the storage tank have been studied. In recent years, for the treatment of the boil-off gas, a method of re-liquefying the boil-off gas to return to the storage tank, and returning the boil-off gas to a fuel such as an engine of a ship The method used as an energy source of a consumer is used.

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 reliquefaction of the boil-off gas, a refrigeration cycle using a separate refrigerant is provided to re-liquefy the boil-off gas by exchanging the boil-off gas with the refrigerant, and a method of re-liquefying the boil-off gas itself as a refrigerant without a separate refrigerant. There is this. In particular, a system employing the latter method is called a Partial Re-liquefaction System (PRS).

한편, 일반적으로 선박에 사용되는 엔진 중 천연가스를 연료로 사용할 수 있는 엔진으로 DFDE, X-DF 엔진, ME-GI 엔진 등의 가스연료엔진이 있다.On the other hand, among the engines generally used in ships as a fuel that can use natural gas as a fuel gas engines such as DFDE, X-DF engine, ME-GI engine.

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.DFDE is composed of four strokes and adopts the Otto Cycle, which injects natural gas with a relatively low pressure of 6.5 bar into the combustion air inlet and compresses the piston as it rises.

X-DF 엔진은, 2행정으로 구성되고, 16 bar 정도의 천연가스를 연료로 사용하며, 오토 사이클을 채택하고 있다.The X-DF engine consists of two strokes, uses about 16 bar of natural gas as fuel, and employs an auto cycle.

ME-GI 엔진은, 2행정으로 구성되며, 300bar 부근의 고압 천연가스를 피스톤의 상사점 부근에서 연소실에 직접 분사하는 디젤 사이클(Diesel Cycle)을 채택하고 있다.The ME-GI engine is composed of two strokes and employs a diesel cycle that directly injects high pressure natural gas near 300 bar into the combustion chamber near the top dead center of the piston.

도 1은 종래의 선박용 증발가스 재액화 시스템의 개략도이다.1 is a schematic diagram of a conventional vessel boil-off gas liquefaction system.

도 1을 참조하면, 종래의 선박용 증발가스 재액화 시스템은, 열교환기(100), 제1 압축기(210), 제2 압축기(220), 감압장치(300), 및 기액분리기(400)를 포함한다.Referring to FIG. 1, a conventional vessel boil-off gas liquefaction system includes a heat exchanger 100, a first compressor 210, a second compressor 220, a pressure reducing device 300, and a gas-liquid separator 400. do.

열교환기(100)는, 저장탱크(T)로부터 배출된 증발가스를 냉매로 하여 제1 압축기(210) 및 제2 압축기(220)에 의해 압축된 증발가스를 열교환시켜 냉각시킨다.The heat exchanger 100 exchanges and cools the boil-off gas compressed by the first compressor 210 and the second compressor 220 by using the boil-off gas discharged from the storage tank T as a refrigerant.

제1 압축기(210)는, 저장탱크(T)로부터 배출된 후 열교환기(100)에서 냉매로 사용된 증발가스를 압축시켜 가스소비처(C)로 보낸다. 가스소비처(C)는 비교적 저압의 천연가스를 연료로 사용하는 X-DF 엔진 또는 DF 엔진일 수 있고 가스연소장치(GCU; Gas Combustion Unit)일 수도 있는데, 가스소비처(C)가 X-DF 엔진 또는 DF 엔진인 경우, 제1 압축기(210)는 가스소비처(C)의 요구 압력으로 증발가스를 압축시킨다.After the first compressor 210 is discharged from the storage tank T, the first compressor 210 compresses the evaporated gas used as the refrigerant in the heat exchanger 100 and sends the compressed gas to the gas consumer C. The gas consumption unit C may be an X-DF engine or a DF engine using relatively low pressure natural gas as a fuel, or may be a gas combustion unit (GCU), and the gas consumption unit C may be an X-DF engine. Alternatively, in the case of the DF engine, the first compressor 210 compresses the boil-off gas to the required pressure of the gas consumer C.

제2 압축기(220)는, 제1 압축기(210)에 의해 압축된 증발가스 중 가스소비처(C)에서 사용되지 않은 잉여 증발가스를 압축시킨다. 종래의 제2 압축기(220)는 3단으로 증발가스를 압축시키는 다단압축기가 적용되었다. 제2 압축기(220)에 의해 압축된 증발가스는 열교환기(100)로 보내져 저장탱크(T)로부터 배출된 증발가스를 냉매로 열교환되어 냉각된다.The second compressor 220 compresses the excess boil-off gas that is not used in the gas consumer C among the boil-off gas compressed by the first compressor 210. The conventional second compressor 220 has been applied to a multi-stage compressor for compressing the boil-off gas in three stages. The boil-off gas compressed by the second compressor 220 is sent to the heat-exchanger 100 to heat-exchange the boil-off gas discharged from the storage tank T with a coolant.

감압장치(300)는, 제2 압축기(220)에 의해 압축된 후 열교환기(100)에 의해 냉각된 유체를 팽창시킨다. 제1 압축기(210) 및 제2 압축기(220)의 압축 과정과, 열교환기(100)의 냉각 과정과, 감압장치(300)의 팽창 과정을 거친 증발가스는 일부 또는 전부가 재액화된다.The decompression device 300 expands the fluid cooled by the heat exchanger 100 after being compressed by the second compressor 220. Some or all of the boil-off gas that has undergone the compression process of the first compressor 210 and the second compressor 220, the cooling process of the heat exchanger 100, and the expansion process of the pressure reducing device 300 is re-liquefied.

기액분리기(400)는, 감압장치(300) 후단에 설치되어 재액화된 액화천연가스와 기체상태의 증발가스를 분리한다. 기체상태의 증발가스에는 재액화되지 못하고 남은 증발가스와 감압장치(300)에 의해 팽창되며 생성된 플래시 가스가 포함될 수 있다.The gas-liquid separator 400 is installed at the rear end of the decompression device 300 to separate the liquefied natural gas and the gaseous evaporated gas. The gaseous evaporated gas may include the remaining evaporated gas which is not reliquefied and the flash gas which is expanded and generated by the decompression device 300.

기액분리기(400)에 의해 분리된 액화천연가스는 저장탱크(T)로 복귀되고, 기액분리기(400)에 의해 분리된 기체상태의 증발가스는 저장탱크(T)로부터 배출되는 증발가스와 합류되어 열교환기(100)의 냉매로 사용될 수 있다.The liquefied natural gas separated by the gas-liquid separator 400 is returned to the storage tank T, and the vaporized gaseous gas separated by the gas-liquid separator 400 is combined with the evaporated gas discharged from the storage tank T. It may be used as a refrigerant of the heat exchanger (100).

종래의 선박용 증발가스 재액화 시스템에 의하면, 제1 압축기(210)에 의해 압축된 증발가스 중 가스수요처로 보내지지 않고 재액화 과정을 거치는 증발가스를 제2 압축기(220)에 의해 추가로 압축시킨 후 열교환기(100)로 보내는데, 제2 압축기(220)에 추가로 압축시키는 이유는, 비교적 저압의 천연가스를 연료로 사용하는 X-DF 엔진 또는 DF 엔진의 요구 압력이 재액화 효율을 위해 요구되는 압력에 비해 낮으므로, 부족한 압력을 제2 압축기(220)에 의해 보상하여 주기 위해서이다.According to the conventional vessel boil-off gas reliquefaction system, the boil-off gas that is subjected to the re-liquefaction without being sent to the gas demand of the boil-off gas compressed by the first compressor 210 is further compressed by the second compressor (220). It is then sent to the heat exchanger (100), which is further compressed by the second compressor (220) because the required pressure of the X-DF engine or DF engine using relatively low pressure natural gas as fuel is required for reliquefaction efficiency. Since the pressure is low compared to the pressure, it is to compensate for the insufficient pressure by the second compressor (220).

제1 압축기(210)는 가스수요처의 요구 압력으로 증발가스를 압축시키므로, X-DF 엔진의 경우 대략 16 bar, DF 엔진의 경우 대략 6.5 bar의 압력으로 증발가스를 압축시키는데, 열교환기(100)에서 열교환 효율은, 유체가 초임계 상태(천연가스의 경우 대략 47 bar)가 아닌 경우 초임계 상태인 경우에 비해 현저히 낮으며, 150 bar 내지 400 bar, 바람직하게는 150 bar 내지 300 bar 사이에서 가장 높다.Since the first compressor 210 compresses the boil-off gas to the required pressure of the gas demand, it compresses the boil-off gas at a pressure of approximately 16 bar for the X-DF engine and approximately 6.5 bar for the DF engine. The heat exchange efficiency at is significantly lower than in the supercritical state when the fluid is not in the supercritical state (approximately 47 bar for natural gas) and is best between 150 bar and 400 bar, preferably between 150 bar and 300 bar. high.

가스수요처가 대략 300 bar의 압력의 천연가스를 요구하는 ME-GI 엔진이라면, 제1 압축기(210)가 대략 300 bar로 압축시킨 증발가스를 추가로 압축시키지 않아도 충분한 재액화 효율을 확보할 수 있으나, 가스수요처가 X-DF 엔진 또는 DF 엔진인 경우에는 엔진의 요구 압력이 재액화 효율에 필요한 압력보다 낮으므로, 제2 압축기(220)에 의해 부족한 압력을 보상하여 재액화 효율을 확보하는 것이다. 종래의 선박용 증발가스 재액화 시스템에 의하면, 제2 압축기(220)는 증발가스를 대략 150 bar로 압축시켰다.If the gas demand is a ME-GI engine requiring natural gas at a pressure of approximately 300 bar, sufficient reliquefaction efficiency can be obtained without further compressing the boil-off gas compressed by the first compressor 210 to approximately 300 bar. In the case where the gas demand is an X-DF engine or a DF engine, since the required pressure of the engine is lower than the pressure required for the reliquefaction efficiency, the second compressor 220 compensates for the insufficient pressure to secure the reliquefaction efficiency. According to the conventional ship boil-off gas liquefaction system, the second compressor 220 compressed the boil-off gas to approximately 150 bar.

그러나, 종래의 선박용 증발가스 재액화 시스템에 의하면, 제1 압축기(210)로 급유 윤활 방식의 압축기를 적용함에 따라, 제1 압축기(210)에 의해 압축되며 증발가스에 일부 섞인 오일이 열교환기(100)로 유입되어 열교환기(100)의 유로를 막거나 열교환 효율을 떨어뜨리는 현상이 발생하였다. 또한, 오일이 섞인 증발가스가 재액화되어 저장탱크로 회수됨으로써, 저장탱크에 저장된 액화천연가스의 순도가 떨어진다는 문제점이 있었다.However, according to the conventional ship boil-off gas reliquefaction system, according to the application of the lubrication lubrication type compressor to the first compressor 210, the oil compressed by the first compressor 210 and partially mixed with the boil-off gas is a heat exchanger ( Flowing into the 100 has occurred a phenomenon of blocking the flow path of the heat exchanger 100 or lowering the heat exchange efficiency. In addition, there is a problem in that the purity of the liquefied natural gas stored in the storage tank is reduced because the oil-mixed evaporated gas is liquefied and recovered to the storage tank.

만약 제1 압축기(210)로 무급유 윤활 방식의 압축기를 적용하면, 급유 윤활 방식인 경우에 2.5년이었던 정비 주기가 1년으로 단축되어 유지 비용이 증가하게 되며, 일반적으로 선박은 2.5년 주기로 도킹하여 정비를 하므로, 정비 주기가 1년인 무급유 윤활 방식의 압축기를 적용하는 것이 거의 불가능한 실정이다.If the compressor of the non-lubricated lubrication type is applied to the first compressor 210, in the case of the lubrication lubrication type, the maintenance period, which was 2.5 years, is shortened to 1 year, thereby increasing the maintenance cost, and in general, the ship is docked every 2.5 years. Since maintenance is performed, it is almost impossible to apply an oil-free lubricating compressor having a maintenance period of one year.

본 발명은 이러한 종래 기술의 문제점을 해결하기 위한 것으로서, 열교환기의 유로가 오일에 의해 막히지 않도록 구성된 선박용 증발가스 재액화 시스템을 제공하고자 한다.The present invention is to solve the problems of the prior art, and to provide a marine boil-off gas reliquefaction system is configured so that the flow path of the heat exchanger is not blocked by oil.

상기 목적을 달성하기 위한 본 발명의 일 측면에 따르면, 증발가스의 일부를 압축시키는 제2 압축기; 상기 제2 압축기로 보내지지 않은 나머지 증발가스를 냉매로 상기 제2 압축기에 의해 압축된 증발가스를 열교환시켜 냉각시키는 열교환기; 상기 열교환기에서 냉매로 사용된 증발가스를 압축시키는 제1 압축기; 및 상기 열교환기에 의해 냉각된 유체를 팽창시키는 감압장치;를 포함하는, 선박용 증발가스 재액화 시스템이 제공된다.According to an aspect of the present invention for achieving the above object, a second compressor for compressing a part of the boil-off gas; A heat exchanger for cooling the remaining boil-off gas not sent to the second compressor by heat-exchanging the boil-off gas compressed by the second compressor with a refrigerant; A first compressor for compressing the boil-off gas used as the refrigerant in the heat exchanger; And a decompression device for expanding the fluid cooled by the heat exchanger.

상기 선박용 증발가스 재액화 시스템은, 상기 감압장치 후단에 설치되어 재액화된 액화천연가스와 기체상태의 증발가스를 분리하는 기액분리기를 더 포함할 수 있다.The vessel boil-off gas liquefaction system may further include a gas-liquid separator installed at the rear end of the decompression device to separate the liquefied liquefied natural gas and the gaseous boil-off gas.

상기 기액분리기에 의해 분리된 기체상태의 증발가스는 상기 열교환기로 보내지는 증발가스와 합류되어 상기 열교환기의 냉매로 사용될 수 있다.The gaseous evaporated gas separated by the gas-liquid separator may be combined with the evaporated gas sent to the heat exchanger and used as a refrigerant of the heat exchanger.

상기 제1 압축기는 급유 윤활 방식일 수 있다.The first compressor may be oil supply lubrication.

상기 제2 압축기는 무급유 윤활 방식일 수 있다.The second compressor may be oil-free lubrication.

상기 제2 압축기는 4단으로 증발가스를 압축시키는 다단압축기일 수 있다.The second compressor may be a multistage compressor that compresses the boil-off gas in four stages.

상기 제2 압축기는 증발가스를 150 bar로 압축시킬 수 있다.The second compressor may compress the boil-off gas to 150 bar.

상기 제1 압축기에 의해 압축된 증발가스는 가스소비처로 보내질 수 있고, 상기 제1 압축기는 상기 가스소비처의 요구 압력으로 증발가스를 압축시킬 수 있다.The boil-off gas compressed by the first compressor may be sent to a gas consumer, and the first compressor may compress the boil-off gas to a required pressure of the gas consumer.

상기 가스소비처는, ME-GI 엔진, X-DF 엔진, DF 엔진, 및 가스연소장치 중 하나 이상일 수 있다.The gas consumer may be one or more of a ME-GI engine, an X-DF engine, a DF engine, and a gas combustion device.

상기 목적을 달성하기 위한 본 발명의 다른 측면에 따르면, 1) 증발가스의 일부를 제2 압축기에 의해 압축시키는 단계; 2) 상기 제2 압축기로 보내지지 않은 증발가스의 다른 일부를 냉매로 상기 1)단계에서 압축된 증발가스를 열교환시켜 냉각시키는 단계; 3) 상기 2)단계에서 열교환의 냉매로 사용된 증발가스를 제1 압축기에 의해 가스소비처의 요구 압력으로 압축시켜 상기 가스소비처로 보내는 단계; 및 4) 상기 2)단계에서 냉각된 유체를 팽창시키는 단계;를 포함하고, 상기 제1 압축기는 급유 윤활 방식이고, 상기 제2 압축기는 무급유 윤활 방식인, 선박용 증발가스 재액화 방법이 제공된다.According to another aspect of the present invention for achieving the above object, 1) compressing a portion of the boil-off gas by a second compressor; 2) cooling the other part of the boil-off gas not sent to the second compressor by using a refrigerant to heat-exchange the boil-off gas compressed in the step 1); 3) compressing the evaporated gas used as the refrigerant of the heat exchanger in the step 2) to the required pressure of the gas consumer by the first compressor and sending it to the gas consumer; And 4) expanding the fluid cooled in the step 2), wherein the first compressor is an oil supply lubrication method, and the second compressor is an oil free lubrication method.

본 발명에 의하면, 급유 윤활 방식의 제1 압축기를 채택함으로써 정비의 효율성을 확보하고 유지 비용을 절감할 수 있으며, 무급유 윤활 방식의 제2 압축기를 채택함으로써 열교환기가 오일에 의해 막히거나 열교환 효율이 떨어지는 경우를 방지할 수 있다.According to the present invention, it is possible to secure the maintenance efficiency and reduce the maintenance cost by adopting the first compressor of the lubrication type, and the heat exchanger is blocked by oil or the heat exchange efficiency is inferior by adopting the second compressor of the lubrication type. The case can be prevented.

또한, 본 발명에 의하면, 오일이 섞인 증발가스가 재액화되어 저장탱크로 회수되는 것을 방지할 수 있으며, 종래와 동일한 열교환 효율 및 재액화 효율을 확보할 수 있다.Further, according to the present invention, it is possible to prevent the boil-off gas mixed with oil to be re-liquefied and recovered to the storage tank, and to ensure the same heat exchange efficiency and re-liquefaction efficiency as in the prior art.

도 1은 종래의 선박용 증발가스 재액화 시스템의 개략도이다.
도 2는 본 발명의 바람직한 실시예에 따른 선박용 증발가스 재액화 시스템의 개략도이다.1 is a schematic diagram of a conventional vessel boil-off gas liquefaction system.
2 is a schematic view of a boil-off gas reliquefaction system 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 시스템은, 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.Hereinafter, the configuration and operation of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Evaporative gas reliquefaction system for ships of the present invention can be applied to a variety of applications, such as a ship equipped with an engine using a natural gas as a fuel and a vessel including a liquefied gas storage tank. In addition, the following examples may be modified in many different 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.The system for the treatment of boil-off gas to be described later of the present invention includes all kinds of vessels and offshore structures, that is, liquefied natural gas carriers, liquefied ethane gas carriers, equipped with storage tanks capable of storing low temperature liquid cargo or liquefied gas, It can be applied to ships such as LNG RV, as well as offshore structures such as LNG FPSO, LNG FSRU. However, embodiments described later will be described by taking liquefied natural gas as a representative low temperature liquid cargo for the convenience of description.

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.In addition, 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 the operating conditions of the system.

도 2는 본 발명의 바람직한 실시예에 따른 선박용 증발가스 재액화 시스템의 개략도이다.2 is a schematic view of a boil-off gas reliquefaction system according to a preferred embodiment of the present invention.

도 2를 참조하면, 본 실시예의 선박용 증발가스 재액화 시스템은, 열교환기(100), 제1 압축기(210), 제2 압축기(220), 및 감압장치(300)를 포함한다.Referring to FIG. 2, the ship boil-off gas liquefaction system of the present embodiment includes a heat exchanger 100, a first compressor 210, a second compressor 220, and a decompression device 300.

본 실시예의 선박에 설치되는 저장탱크(T)는, 액화천연가스 등의 액화가스를 극저온 상태로 저장할 수 있도록 밀봉 및 단열 방벽을 갖추고 있지만 외부로부터 전달되는 열을 완벽하게 차단할 수는 없다. 따라서, 저장탱크(T) 내에서는 액화가스의 증발이 지속적으로 이루어진다. 저장탱크(T) 내에 증발된 액화가스가 채워질수록 탱크 내압이 상승하게 되므로, 증발가스에 의한 탱크 압력의 과도한 상승을 막고 적정한 수준의 내압을 유지하기 위해, 저장탱크(T) 내부의 증발가스를 배출시킨다.The storage tank T installed in the ship of this embodiment is equipped with a sealing and insulating barrier so as to store liquefied gas such as liquefied natural gas in a cryogenic state, but cannot completely block heat transferred from the outside. Therefore, the evaporation of the liquefied gas is continuously performed in the storage tank (T). As the liquefied gas evaporated in the storage tank T is filled, the internal pressure of the tank is increased. Therefore, in order to prevent excessive increase in the tank pressure due to the evaporated gas and to maintain an appropriate internal pressure, the evaporated gas in the storage tank T is increased. Discharge.

저장탱크(T)로부터 배출된 증발가스는, 일부는 제2 압축기(220)로 보내지고, 나머지는 열교환기(100)로 보내진다.Part of the evaporated gas discharged from the storage tank (T) is sent to the second compressor 220, and the rest is sent to the heat exchanger (100).

본 실시예의 열교환기(100)는, 저장탱크(T)로부터 배출된 증발가스를 냉매로 하여 제2 압축기(220)에 의해 압축된 증발가스를 열교환시켜 냉각시킨다.The heat exchanger 100 of the present embodiment heats and cools the boil-off gas compressed by the second compressor 220 using the boil-off gas discharged from the storage tank T as a refrigerant.

본 실시예의 제1 압축기(210)는, 급유 윤활 방식이며, 저장탱크(T)로부터 배출된 후 열교환기(100)에서 냉매로 사용된 증발가스를 압축시켜 가스소비처(C)로 보낸다. 가스소비처(C)는, ME-GI 엔진, X-DF 엔진, DF 엔진, 및 가스연소장치 중 하나 이상일 수 있으며, 비교적 저압의 천연가스를 연료로 사용하는 X-DF 엔진 또는 DF 엔진인 것이 바람직하다. 가스소비처(C)가 ME-GI 엔진, X-DF 엔진, 또는 DF 엔진인 경우, 제1 압축기(210)는 가스소비처(C)의 요구 압력으로 증발가스를 압축시킨다.The first compressor 210 of the present embodiment is a lubrication system for lubrication, and after being discharged from the storage tank T, compresses the evaporated gas used as the refrigerant in the heat exchanger 100 and sends it to the gas consumer C. The gas consumption unit C may be one or more of a ME-GI engine, an X-DF engine, a DF engine, and a gas combustion device, and is preferably an X-DF engine or a DF engine using relatively low pressure natural gas as a fuel. Do. When the gas consumption C is a ME-GI engine, an X-DF engine, or a DF engine, the first compressor 210 compresses the boil-off gas to the required pressure of the gas consumption C.

본 실시예의 제2 압축기(220)는, 저장탱크(T)로부터 배출된 증발가스의 일부를 압축시켜 열교환기(100)로 보낸다. 제2 압축기(220)는 열교환기(100)에서의 열교환 효율을 높여 재액화 효율을 높이기 위하여 설치되며, 증발가스를 대략 150 bar로 압축시킬 수 있다. 또한, 제2 압축기(220)는 무급유 윤활 방식이며, 4단으로 증발가스를 압축시키는 다단압축기일 수 있다.The second compressor 220 of the present embodiment compresses a part of the boil-off gas discharged from the storage tank T and sends it to the heat exchanger 100. The second compressor 220 is installed to increase the heat exchange efficiency in the heat exchanger 100 to increase the re-liquefaction efficiency, and may compress the boil-off gas to about 150 bar. In addition, the second compressor 220 is an oil-free lubrication method, and may be a multistage compressor that compresses the evaporated gas into four stages.

본 실시예의 감압장치(300)는, 제2 압축기(220)에 의해 압축된 후 열교환기(100)에 의해 냉각된 유체를 팽창시킨다. 감압장치(300)는 다수개가 병렬로 설치될 수도 있다. 제2 압축기(220)의 압축 과정과, 열교환기(100)의 냉각 과정과, 감압장치(300)의 팽창 과정을 거친 증발가스는 일부 또는 전부가 재액화된다.The pressure reducing device 300 according to the present embodiment expands the fluid cooled by the heat exchanger 100 after being compressed by the second compressor 220. A plurality of decompression device 300 may be installed in parallel. Some or all of the evaporated gas that has undergone the compression of the second compressor 220, the cooling of the heat exchanger 100, and the expansion of the pressure reducing device 300 is reliquefied.

본 실시예의 선박용 증발가스 재액화 시스템은, 감압장치(300) 후단에 설치되어 재액화된 액화천연가스와 기체상태의 증발가스를 분리하는 기액분리기(400)를 더 포함할 수 있다. 기체상태의 증발가스에는 재액화되지 못하고 남은 증발가스와 감압장치(300)에 의해 팽창되며 생성된 플래시 가스가 포함될 수 있다.The vessel boil-off liquefaction system of the present embodiment may further include a gas-liquid separator 400 installed at the rear end of the decompression device 300 to separate the liquefied liquefied natural gas and the gaseous boil-off gas. The gaseous evaporated gas may include the remaining evaporated gas which is not reliquefied and the flash gas which is expanded and generated by the decompression device 300.

본 실시예의 기액분리기(400)에 의해 분리된 액화천연가스는 저장탱크(T)로 복귀되고, 기액분리기(400)에 의해 분리된 기체상태의 증발가스는 저장탱크(T)로부터 배출되는 증발가스와 합류되어 열교환기(100)의 냉매로 사용될 수 있다.The liquefied natural gas separated by the gas-liquid separator 400 of the present embodiment is returned to the storage tank T, and the vaporized gaseous gas separated by the gas-liquid separator 400 is the evaporated gas discharged from the storage tank T. Joined with may be used as a refrigerant of the heat exchanger (100).

본 실시예의 선박용 증발가스 재액화 시스템은, 급유 윤활 방식의 제1 압축기(210)를 채택함으로써 정비의 효율성을 확보하고 유지 비용을 절감할 수 있으며, 무급유 윤활 방식의 제2 압축기(220)를 채택함으로써 열교환기(100)가 오일에 의해 막히거나 열교환 효율이 떨어지는 경우를 방지할 수 있다. 또한, 오일이 섞인 증발가스가 재액화되어 저장탱크로 회수되는 것을 방지할 수 있으며, 열교환기(100)로 보내지는 증발가스의 압력은 종래의 경우와 동일하므로 종래와 동일한 열교환 효율 및 재액화 효율을 확보할 수 있다.In the ship boil-off gas reliquefaction system of the present embodiment, by adopting the first compressor 210 of the lubrication lubrication method can ensure the maintenance efficiency and reduce the maintenance cost, and adopts the second compressor 220 of the lubrication-free lubrication method As a result, the heat exchanger 100 may be prevented from being blocked by oil or deteriorating heat exchange efficiency. In addition, it is possible to prevent the oil-mixed boil-off gas is re-liquefied to be recovered to the storage tank, the pressure of the boil-off gas sent to the heat exchanger 100 is the same as the conventional case, the same heat exchange efficiency and re-liquefaction efficiency as in the prior art Can be secured.

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.The present invention is not limited to the above embodiments, and various modifications or changes may be made without departing from the technical spirit of the present invention, which will be apparent to those of ordinary skill in the art. It is.

T : 저장탱크 C : 가스소비처
100 : 열교환기 210, 220 : 압축기
300 : 감압장치 400 : 기액분리기T: Storage Tank C: Gas Consumption
100: heat exchanger 210, 220: compressor
300: decompression device 400: gas-liquid separator

Claims (10)

급유 윤활 방식의 압축기이며, 가스 소비처에서 요구하는 압력으로 증발가스를 압축시키는 제1 압축기;
무급유 윤활 방식의 압축기이며, 재액화시킬 증발가스를 압축시키는 제2 압축기;
상기 제2 압축기에서 압축된 증발가스를, 상기 제1 압축기로 공급되는 압축 전 증발가스의 냉열로 냉각시키는 열교환기; 및
상기 열교환기에 의해 냉각된 유체를 팽창시키는 감압장치;를 포함하며,
상기 증발가스는 저장탱크로부터 배출되어 상기 제1 압축기 및 제2 압축기로 각각 분기되어 공급되고,
상기 급유 윤활 방식의 제1 압축기에서 압축된 증발가스는 가스 소비처로 공급되고, 상기 무급유 윤활 방식의 제2 압축기에서 압축된 증발가스는 상기 열교환기 및 감압장치를 통과하면서 재액화되어 상기 저장탱크로 회수되고,
상기 제1 압축기에서 압축되어 가스 소비처로 공급되는 증발가스의 압력은, 상기 제2 압축기에서 압축되어 열교환기로 공급되는 증발가스의 압력보다 낮은 저압이며,
상기 제2 압축기에서 압축되어 열교환기로 공급되는 증발가스의 압력은, 상기 제1 압축기에서 압축되어 가스 소비처로 공급되는 증발가스의 압력보다 높은 고압인, 선박용 증발가스 재액화 시스템. A compressor of an oil supply lubrication type, comprising: a first compressor for compressing boil-off gas to a pressure required by a gas consumer;
A compressor free of lubrication, the second compressor compressing an evaporated gas to be reliquefied;
A heat exchanger for cooling the boil-off gas compressed by the second compressor with cold heat of the boil-off gas before compression supplied to the first compressor; And
And a decompression device for expanding the fluid cooled by the heat exchanger.
The boil-off gas is discharged from the storage tank and branched to the first compressor and the second compressor, respectively,
The boil-off gas compressed in the first oil supply lubrication type compressor is supplied to a gas consumer, and the boil-off gas compressed in the oil-free lubrication type 2 compressor is liquefied while passing through the heat exchanger and the decompression device to the storage tank. Retrieved,
The pressure of the boil-off gas compressed in the first compressor and supplied to the gas consumer is a low pressure lower than the pressure of the boil-off gas compressed in the second compressor and supplied to the heat exchanger.
The pressure of the boil-off gas compressed in the second compressor and supplied to the heat exchanger is a high pressure higher than the pressure of the boil-off gas compressed in the first compressor and supplied to the gas consumer. 청구항 1에 있어서,
상기 감압장치 후단에 설치되어 재액화된 액화천연가스와 기체상태의 증발가스를 분리하는 기액분리기를 더 포함하는, 선박용 증발가스 재액화 시스템.The method according to claim 1,
And a gas-liquid separator installed at the rear end of the decompression device to separate the liquefied liquefied natural gas and the gaseous evaporated gas. 청구항 2에 있어서,
상기 기액분리기에 의해 분리된 기체상태의 증발가스는 상기 열교환기로 보내지는 증발가스와 합류되어 상기 열교환기의 냉매로 사용되는, 선박용 증발가스 재액화 시스템.The method according to claim 2,
The gaseous boil-off gas separated by the gas-liquid separator is combined with the boil-off gas sent to the heat exchanger is used as a refrigerant of the heat exchanger, marine boil-off gas reliquefaction system. 삭제delete 삭제delete 청구항 1 내지 청구항 3 중 어느 한 항에 있어서,
상기 제2 압축기는 4단으로 증발가스를 압축시키는 다단압축기인, 선박용 증발가스 재액화 시스템.The method according to any one of claims 1 to 3,
The second compressor is a multi-stage compressor for compressing the boil-off gas in four stages, the ship boil-off gas reliquefaction system. 청구항 1 내지 청구항 3 중 어느 한 항에 있어서,
상기 제2 압축기는 증발가스를 150 bar로 압축시키는, 선박용 증발가스 재액화 시스템.The method according to any one of claims 1 to 3,
And the second compressor compresses the boil-off gas to 150 bar. 삭제delete 청구항 1 내지 3 중 어느 한 항에 있어서,
상기 가스소비처는, ME-GI 엔진, X-DF 엔진, DF 엔진, 및 가스연소장치 중 하나 이상인, 선박용 증발가스 재액화 시스템.The method according to any one of claims 1 to 3,
The gas consumer is a marine gaseous liquefaction system, at least one of the ME-GI engine, X-DF engine, DF engine, and gas combustion device. 저장탱크로부터 배출된 증발가스를 가스 소비처로 공급할 증발가스 흐름과 재액화시킬 증발가스 흐름으로 분기시켜,
상기 가스 소비처로 공급할 증발가스를 급유 윤활 방식의 압축기를 이용하여 가스 소비처에서 요구하는 압력으로 압축시키고,
상기 재액화시킬 증발가스는 무급유 윤활 방식의 압축기를 이용하여 압축시킨 후, 상기 가스 소비처로 공급할 증발가스를 압축시키기 전에 상기 가스 소비처로 공급할 증발가스의 냉열을 회수하여 상기 재액화시킬 압축 증발가스를 냉각시키고, 상기 냉각된 압축 증발가스는 팽창시켜 재액화시키며,
상기 급유 윤활 방식의 압축기에 의해 압축된 증발가스는 상기 가스 소비처로 공급하고, 상기 무급유 윤활 방식의 압축기를 이용하여 압축시킨 증발가스는 재액화시켜 상기 저장탱크로 회수하고,
상기 가스 소비처로 공급하기 위하여 압축시키는 증발가스의 압력은, 상기 재액화시키기 위하여 압축시키는 증발가스의 압력보다 낮은 저압이며,
상기 재액화시키기 위하여 압축시키는 증발가스의 압력은, 상기 가스 소비처로 공급하기 위하여 압축시키는 증발가스의 압력보다 높은 고압인, 선박용 증발가스 재액화 방법. Branching the boil-off gas discharged from the storage tank into the boil-off gas stream to be supplied to the gas consumer and the boil-off gas stream to be reliquefied,
Compresses the evaporated gas to be supplied to the gas consumer to the pressure required by the gas consumer using a lubrication compressor.
The compressed boil-off gas to be reliquefied is compressed using an oil-free lubrication compressor, and before the compressed boil-off gas to be supplied to the gas consumer is recovered, the cold heat of the boil-off gas to be supplied to the gas consumer is recovered to recover the compressed boil-off gas to be reliquefied. Cooled, the cooled compressed boil-off gas is expanded to reliquefy,
The boil-off gas compressed by the oil supply lubrication compressor is supplied to the gas consumer, and the boil-off gas compressed by the oil-free lubrication compressor is liquefied and recovered into the storage tank.
The pressure of the boil-off gas compressed to supply to the gas consumer is a low pressure lower than the pressure of the boil-off gas compressed to reliquefy,
The pressure of the boil-off gas compressed for reliquefaction is a high pressure higher than the pressure of the boil-off gas compressed for supply to the gas consumer.
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