KR101867033B1 - BOG Reliquefaction System and Method for Vessel - Google Patents

BOG Reliquefaction System and Method for Vessel Download PDF

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KR101867033B1
KR101867033B1 KR1020160119319A KR20160119319A KR101867033B1 KR 101867033 B1 KR101867033 B1 KR 101867033B1 KR 1020160119319 A KR1020160119319 A KR 1020160119319A KR 20160119319 A KR20160119319 A KR 20160119319A KR 101867033 B1 KR101867033 B1 KR 101867033B1
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gas
compressor
compressed
evaporation gas
storage tank
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KR20180031217A (en
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윤상득
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대우조선해양 주식회사
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    • 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
    • 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
    • F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
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    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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    • 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
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    • F17C6/00—Methods and apparatus for filling vessels not under pressure with liquefied or solidified gases
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    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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    • 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
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    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
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    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/0035—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by gas expansion with extraction of work
    • F25J1/0037—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by gas expansion with extraction of work of a return stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • 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
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/004—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by flash gas recovery
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • 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
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0201—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using only internal refrigeration means, i.e. without external refrigeration
    • F25J1/0202—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using only internal refrigeration means, i.e. without external refrigeration in a quasi-closed internal refrigeration loop
    • 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
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
    • F25J1/0229—Integration with a unit for using hydrocarbons, e.g. consuming hydrocarbons as feed stock
    • F25J1/023—Integration with a unit for using hydrocarbons, e.g. consuming hydrocarbons as feed stock for the combustion as fuels, i.e. integration with the fuel gas system
    • 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
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
    • F25J1/0275—Construction and layout of liquefaction equipments, e.g. valves, machines adapted for special use of the liquefaction unit, e.g. portable or transportable devices
    • F25J1/0277—Offshore use, e.g. during shipping
    • 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
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
    • F25J1/0285—Combination of different types of drivers mechanically coupled to the same refrigerant compressor, possibly split on multiple compressor casings
    • F25J1/0288—Combination of different types of drivers mechanically coupled to the same refrigerant compressor, possibly split on multiple compressor casings using work extraction by mechanical coupling of compression and expansion of the refrigerant, so-called companders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0337—Heat exchange with the fluid by cooling
    • F17C2227/0339—Heat exchange with the fluid by cooling using the same fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • F17C2265/032—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
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    • F17C2265/00—Effects achieved by gas storage or gas handling
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    • F17C2265/038—Treating the boil-off by recovery with expanding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
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Abstract

선박용 증발가스 재액화 방법이 개시된다.
상기 선박용 증발가스 재액화 방법은, 1) 저장탱크로부터 배출된 증발가스를 압축시키고, 2) 상기 1)단계에서 압축된 증발가스의 일부를 팽창시키고, 3) 상기 1)단계에서 압축된 증발가스의 다른 일부를 추가적으로 압축시키고, 4) 상기 2)단계에서 팽창된 증발가스와, 상기 1)단계에서 상기 저장탱크로부터 배출된 증발가스를 냉매로, 상기 3)단계에서 추가적으로 압축된 증발가스를 열교환시켜 냉각시키고, 5) 상기 4)단계에서 열교환되어 냉각된 유체를 팽창시킨다.Disclosed is a method for re-liquefaction of marine vaporized gas.
The method for liquefying the vessel evaporative gas comprises the steps of 1) compressing the evaporated gas discharged from the storage tank, 2) expanding a part of the evaporated gas compressed in the 1), 3) expanding the evaporated gas compressed in the 1) Further compressing another part of the evaporation gas in step 2), and 4) evaporating the expanded gas in step 2) and the evaporated gas discharged from the storage tank in step 1) And 5) expanding the fluid that has been heat-exchanged in step 4).

Description

선박용 증발가스 재액화 시스템 및 방법{BOG Reliquefaction System and Method for Vessel}BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a system and method for re-

본 발명은 선박용 엔진에 사용되고 남은 잉여 증발가스를 재액화시키는 시스템 및 방법에 관한 것이다.The present invention relates to a system and a method for re-liquefying residual surplus evaporative gas used in a marine engine.

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

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

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

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

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

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

DFDE은, 발전용으로 사용되며, 4행정으로 구성된다. 비교적 저압인 6.5 bar 정도의 압력을 가지는 천연가스를 연소공기 입구에 주입하여, 피스톤이 올라가면서 압축을 시키는 오토 사이클(Otto Cycle)을 채택하고 있다.DFDE is used for power generation and consists of four strokes. (Otto Cycle), in which natural gas having a relatively low pressure of about 6.5 bar is injected into the combustion air inlet, and the piston is compressed as it ascends.

ME-GI 엔진은, 추진용으로 사용되며, 2행정으로 구성된다. 300 bar 부근의 고압 천연가스를 피스톤의 상사점 부근에서 연소실에 직접 분사하는 디젤 사이클(Diesel Cycle)을 채택하고 있다.The ME-GI engine is used for propulsion and consists of two strokes. It adopts a diesel cycle in which high pressure natural gas near 300 bar is injected directly to the combustion chamber near the top dead center of the piston.

X-DF 엔진은, 추진용으로 사용되며, 2행정으로 구성된다. 16 bar 정도의 중압 천연가스를 연료로 사용하며, 오토 사이클을 채택하고 있다.The X-DF engine is used for propulsion and consists of two strokes. It uses heavy-duty natural gas of about 16 bar as fuel and adopts autocycle.

본 발명은 기존의 부분 재액화 시스템에 비해 향상된 증발가스 재액화 성능을 발휘할 수 있는 선박용 증발가스 재액화 시스템 및 방법을 제공하고자 한다.The present invention seeks to provide a system and method for liquefying a ship's evaporative gas that can exhibit enhanced liquefaction performance of an evaporative gas compared to a conventional partial liquefaction system.

상기 목적을 달성하기 위한 본 발명의 일 측면에 따르면, 1) 저장탱크로부터 배출된 증발가스를 압축시키고, 2) 상기 1)단계에서 압축된 증발가스의 일부를 팽창시키고, 3) 상기 1)단계에서 압축된 증발가스의 다른 일부를 추가적으로 압축시키고, 4) 상기 2)단계에서 팽창된 증발가스와, 상기 1)단계에서 상기 저장탱크로부터 배출된 증발가스를 냉매로, 상기 3)단계에서 추가적으로 압축된 증발가스를 열교환시켜 냉각시키고, 5) 상기 4)단계에서 열교환되어 냉각된 유체를 팽창시키는, 선박용 증발가스 재액화 방법이 제공된다.According to an aspect of the present invention, there is provided a method of manufacturing a gas turbine comprising the steps of: 1) compressing an evaporated gas discharged from a storage tank, 2) expanding a part of the evaporated gas compressed in the step 1), 3) Further compressing another part of the compressed evaporated gas in step 3), 4) evaporating the expanded gas in step 2) and the evaporated gas discharged from the storage tank in step 1) as a refrigerant, and further compressing And 5) expanding the fluid that has been heat-exchanged in the step 4), thereby providing a vapor liquefaction method for a ship.

상기 1)단계에서, 상기 2)단계에서 증발가스를 팽창시키며 생산된 동력을 사용하여 증발가스를 압축시킬 수 있다.In the step 1), the evaporation gas may be expanded in the step 2), and the generated gas may be compressed using the generated power.

3-1) 상기 3)단계에서 추가적으로 압축된 증발가스를 한번 더 압축시킬 수 있고, 상기 4)단계에서, 상기 2)단계에서 팽창된 증발가스와, 상기 1)단계에서 상기 저장탱크로부터 배출된 증발가스를 냉매로, 상기 3-1)단계에서 한번 더 압축된 증발가스를 열교환시켜 냉각시킬 수 있다.3-1) The evaporation gas compressed additionally in step 3) can be further compressed, and in the step 4), the evaporation gas expanded in the step 2) and the evaporated gas expanded in the storage tank in the step 1) It is possible to cool the evaporation gas as a refrigerant by heat-exchanging the evaporated gas once more compressed in the step 3-1).

상기 2)단계에서 팽창된 후 상기 4)단계에서 열교환의 냉매로 사용된 증발가스는, 상기 1)단계에서 상기 저장탱크로부터 배출된 후 상기 4)단계에서 열교환의 냉매로 사용된 증발가스와 합류되어, 상기 1)단계의 압축 과정을 거칠 수 있다.The evaporation gas used as the refrigerant for the heat exchange in the step 4) after the expansion in the step 2) is discharged from the storage tank in the step 1), and the evaporation gas used as the refrigerant for the heat exchange in the step 4) And may be subjected to the compression process of the step 1).

상기 3)단계에서 추가적으로 압축된 증발가스 중, 상기 4)단계의 냉각 과정을 거치지 않는 나머지 증발가스는, 한 번 더 압축된 후 제1 엔진으로 공급될 수 있다.The remaining evaporated gas which has not been subjected to the cooling process in the step 4) out of the additional compressed evaporated gas in the step 3) may be further compressed and then supplied to the first engine.

상기 1)단계에서 압축된 증발가스 중, 상기 2)단계의 팽창 과정 또는 상기 3)단계의 추가적인 압축 과정을 거치지 않는 나머지 증발가스는, 제2 엔진으로 공급될 수 있다.The remaining evaporation gas which has not undergone the expansion process of the step 2) or the additional compression process of the step 3) among the evaporation gases compressed in the step 1) may be supplied to the second engine.

6) 상기 5)단계에서 팽창된 유체를 액화가스와 기체 상태의 증발가스로 분리할 수 있고, 상기 6)단계에서 분리된 액화가스는 상기 저장탱크로 보내질 수 있다.6) The fluid expanded in the step 5) may be separated into a liquefied gas and an evaporated gas in a gaseous state, and the liquefied gas separated in the step 6) may be sent to the storage tank.

상기 6)단계에서 분리된 기체 상태의 증발가스는, 상기 1)단계에서 상기 저장탱크로부터 배출되는 증발가스와 합류된 후, 상기 4)단계에서 열교환의 냉매로 사용될 수 있다.The gaseous vaporized gas separated in the step 6) may be used as a refrigerant for heat exchange in the step 4) after being combined with the vaporized gas discharged from the storage tank in the step 1).

상기 목적을 달성하기 위한 본 발명의 다른 측면에 따르면, 저장탱크로부터 배출된 증발가스를 압축시키는 제1 압축기; 상기 제1 압축기에 의해 압축된 증발가스의 일부를 팽창시키는 제1 감압장치; 상기 제1 압축기에 의해 압축된 증발가스의 다른 일부를 압축시키는 제2 압축기; 상기 저장탱크로부터 배출된 증발가스와, 상기 제1 감압장치에 의해 팽창된 증발가스를 냉매로 사용하여, 상기 제2 압축기에 의해 압축된 증발가스를 열교환시켜 냉각시키는 열교환기; 및 상기 열교환기에 의해 냉각된 증발가스를 팽창시키는 제2 감압장치;를 포함하는, 선박용 증발가스 재액화 시스템이 제공된다.According to another aspect of the present invention, there is provided a refrigerator comprising: a first compressor for compressing an evaporated gas discharged from a storage tank; A first decompression device for expanding a part of the evaporated gas compressed by the first compressor; A second compressor for compressing another portion of the evaporated gas compressed by the first compressor; A heat exchanger that uses the evaporation gas discharged from the storage tank and the evaporation gas expanded by the first decompressor as a refrigerant to heat exchange the evaporation gas compressed by the second compressor to cool the evaporation gas; And a second decompression device for expanding the evaporated gas cooled by the heat exchanger.

상기 제1 압축기와 상기 제1 감압장치는 압신기를 형성할 수 있다.The first compressor and the first decompressor may form a compressing unit.

상기 선박용 증발가스 재액화 시스템은, 상기 제2 압축기에 의해 압축된 증발가스를 추가로 압축시키는 제3 압축기를 더 포함할 수 있고, 상기 열교환기는, 상기 저장탱크로부터 배출된 증발가스와, 상기 제1 감압장치에 의해 팽창된 증발가스를 냉매로 사용하여, 상기 제3 압축기에 의해 압축된 증발가스를 열교환시켜 냉각시킬 수 있다.The ship evaporative gas re-liquefaction system may further include a third compressor for further compressing the evaporated gas compressed by the second compressor, wherein the heat exchanger further comprises a third evaporator for evaporating the evaporated gas discharged from the storage tank, 1 evaporation gas expanded by the decompression device is used as a refrigerant, and the evaporation gas compressed by the third compressor is heat-exchanged and cooled.

상기 저장탱크로부터 배출된 후 상기 열교환기의 냉매로 사용된 증발가스는, 상기 제1 감압장치에 의해 팽창된 후 상기 열교환기의 냉매로 사용된 증발가스와 합류되어, 상기 제1 압축기에 의해 압축될 수 있다.The evaporation gas used as the refrigerant of the heat exchanger after being discharged from the storage tank is expanded by the first decompression device and merged with the evaporation gas used as the refrigerant of the heat exchanger, .

상기 선박용 증발가스 재액화 시스템은, 상기 제2 압축기에 의해 압축된 증발가스 중, 상기 열교환기로 보내지지 않은 증발가스를 압축시키는 제4 압축기를 더 포함할 수 있고, 상기 제4 압축기에 의해 압축된 증발가스는 제1 엔진으로 보내질 수 있다.The ship evaporative gas re-liquefaction system may further comprise a fourth compressor for compressing an evaporative gas not sent to the heat exchanger among the evaporated gas compressed by the second compressor, Evaporative gas may be sent to the first engine.

상기 제1 압축기에 의해 압축된 증발가스 중, 상기 제1 갑압장치 또는 상기 제2 압축기로 보내지지 않은 나머지 증발가스는 제2 엔진으로 보내질 수 있다.The remaining evaporative gas, which is not sent to the first compressor or the second compressor, may be sent to the second engine among the evaporated gases compressed by the first compressor.

상기 선박용 증발가스 재액화 시스템은, 상기 제2 감압장치에 의해 팽창된 유체를 액화가스와 기체 상태의 증발가스로 분리하는 기액분리기를 더 포함할 수 있고, 상기 기액분리기에 의해 분리된 액화가스는 상기 저장탱크로 보내질 수 있다.The vessel evaporation gas re-liquefaction system may further comprise a gas-liquid separator for separating the fluid expanded by the second decompression device into a liquefied gas and an evaporated gas in a gaseous state, and the liquefied gas separated by the gas- And may be sent to the storage tank.

상기 기액분리기에 의해 분리된 기체 상태의 증발가스는, 상기 저장탱크로부터 배출된 증발가스와 합류되어, 상기 열교환기의 냉매로 사용될 수 있다.The gaseous vaporized gas separated by the gas-liquid separator may be combined with the vaporized gas discharged from the storage tank and used as a refrigerant in the heat exchanger.

상기 목적을 달성하기 위한 본 발명의 또 다른 측면에 따르면, 1) 저장탱크로부터 배출된 증발가스의 일부는 팽창시키고, 다른 일부는 압축시키고, 2) 상기 저장탱크로부터 배출된 증발가스와, 상기 저장탱크로부터 배출된 후 팽창된 증발가스를 냉매로, 상기 저장탱크로부터 배출된 후 압축된 증발가스를 열교환시켜 냉각시키고, 3) 상기 열교환되어 냉각된 증발가스를 팽창시키는, 선박용 증발가스 재액화 방법이 제공된다.According to another aspect of the present invention for achieving the above object, there is provided a method of controlling an evaporator, comprising the steps of: 1) expanding a part of evaporated gas discharged from a storage tank and compressing another part; 2) The evaporation gas re-liquefaction method for a ship, which evaporates the expanded evaporated gas after being discharged from a tank as a refrigerant, cooling the evaporated gas after it is discharged from the storage tank by heat exchange with the compressed evaporated gas, and 3) / RTI >

본 발명에 의하면, 압신기(Compander)를 포함하여, 팽창기가 증발가스를 팽창시키면서 얻은 동력을 증발가스를 압축시키는 데 사용하므로, 에너지를 절감할 수 있다.According to the present invention, the energy obtained by expanding the evaporation gas, including the compressor, is used to compress the evaporation gas, so that energy can be saved.

또한, 본 발명에 의하면, 압축 과정을 거치는 증발가스의 일부를 팽창시킨 후 열교환기에서 냉매로 사용하므로, 증발가스를 재액화시키는데 더 많은 냉열을 공급할 수 있어, 재액화 효율 및 재액화량을 증가시킬 수 있다.Further, according to the present invention, since a part of the evaporation gas subjected to the compression process is expanded and used as a refrigerant in the heat exchanger, it is possible to supply more cool heat to re-liquefy the evaporation gas, thereby increasing the re- .

도 1은 본 발명의 바람직한 실시예에 따른 선박용 증발가스 재액화 시스템의 개략 구성도이다.1 is a schematic block diagram of a system for re-liquefying a ship vaporization 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 시스템 및 방법은, 천연가스를 연료로 사용하는 엔진을 탑재한 선박 및 액화가스 저장탱크를 포함하는 선박 등에 다양하게 응용되어 적용될 수 있다. 또한, 하기 실시예는 여러 가지 다른 형태로 변형될 수 있으며, 본 발명의 범위가 하기 실시예에 한정되는 것은 아니다.DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The system and method for liquefying the ship's evaporative gas according to the present invention can be applied to various applications such as a ship equipped with an engine using natural gas as fuel and a ship including a liquefied gas storage tank. In addition, the following examples can be modified in various forms, and the scope of the present invention is not limited to the following examples.

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

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

도 1은 본 발명의 바람직한 실시예에 따른 선박용 증발가스 재액화 시스템의 개략 구성도이다.1 is a schematic block diagram of a system for re-liquefying a ship vaporization gas according to a preferred embodiment of the present invention.

도 1을 참조하면, 본 실시예의 선박용 증발가스 재액화 시스템은, 열교환기(100), 제1 압축기(210), 제1 감압장치(310), 제2 압축기(220), 및 제2 감압장치(320)를 포함한다.1, the evaporation gas re-liquefaction system for a ship according to the present embodiment includes a heat exchanger 100, a first compressor 210, a first decompressor 310, a second compressor 220, (320).

본 실시예의 저장탱크(T)는, 내부에 액화천연가스, 액화에탄가스 등의 액화가스를 저장하며, 내부 압력이 일정 압력 이상이 되면 증발가스를 외부로 배출시킨다. 저장탱크(T)로부터 배출되는 증발가스(b 라인)는 열교환기(100)로 보내진다.The storage tank T of this embodiment stores liquefied natural gas such as liquefied natural gas or liquefied ethane gas, and discharges the evaporated gas to the outside when the internal pressure exceeds a predetermined pressure. The evaporation gas (line b) discharged from the storage tank T is sent to the heat exchanger 100.

본 실시예의 열교환기(100)는, 저장탱크(T)로부터 배출되는 증발가스(b 라인)와 제1 감압장치(310)에 의해 팽창된 증발가스(c 라인)를 냉매로 사용하여, 제1 압축기(210) 및 제2 압축기(220)에 의해 압축된 증발가스(a 라인)를 열교환시켜 냉각시킨다.The heat exchanger 100 of the present embodiment uses evaporation gas (line b) discharged from the storage tank T and evaporation gas (line c) expanded by the first decompressor 310 as refrigerant, (A line) compressed by the compressor 210 and the second compressor 220 is cooled by heat exchange.

본 실시예의 열교환기(100)는 세 유로를 가지며, 한 유로에는 제1 압축기(210) 및 제2 압축기(220)에 의해 압축된 증발가스(a 라인)가 흐르고, 다른 유로에는 저장탱크(T)로부터 배출된 증발가스(b 라인)가 흐르고, 나머지 유로에는 제1 감압장치(310)에 의해 팽창된 증발가스(c 라인)가 흐른다.The heat exchanger 100 of this embodiment has three flow paths and the evaporation gas (a line) compressed by the first compressor 210 and the second compressor 220 flows through one flow path and the evaporation gas And the evaporation gas (line c) expanded by the first decompression device 310 flows through the remaining channels.

본 실시예의 제1 압축기(210)는, 저장탱크(T)로부터 배출된 후 열교환기(100)에서 냉매로 사용된 증발가스를 압축시키며, 본 실시예의 제1 감압장치(310)는, 제1 압축기(210)에 의해 압축된 증발가스 중 일부를 팽창시킨다.The first compressor 210 of the present embodiment compresses the evaporation gas used as the refrigerant in the heat exchanger 100 after being discharged from the storage tank T. The first decompression apparatus 310 of this embodiment includes the first compressor 310, And expands a part of the evaporated gas compressed by the compressor (210).

제1 감압장치(310)에 의해 팽창된 증발가스는 열교환기(100)로 보내져 냉매로 사용되며, 제1 감압장치(310)는 팽창기일 수 있다. 팽창기는 줄-톰슨 밸브 등의 팽창밸브보다 더 큰 폭의 온도 강하를 얻을 수 있다는 장점이 있다.The evaporated gas expanded by the first decompressor 310 is sent to the heat exchanger 100 and used as a refrigerant. The first decompressor 310 may be an expander. The inflator has the advantage that a larger temperature drop can be obtained than an expansion valve such as the Row-Thomson valve.

본 실시예의 제1 압축기(210)는, 제1 감압장치(310)가 증발가스를 팽창시키면서 생산하는 동력에 의해 구동될 수 있다. 즉, 본 실시예의 제1 압축기(210)와 제1 감압장치(310)는 압신기(Compander, 410)를 형성할 수 있다.The first compressor 210 of the present embodiment can be driven by the power produced by the first decompression device 310 while expanding the evaporation gas. That is, the first compressor 210 and the first decompressor 310 of the present embodiment can form a compressor 410.

본 실시예의 제2 압축기(220)는, 제1 압축기(210)에 의해 압축된 증발가스 중 제1 감압장치(310)로 보내지지 않은 나머지 증발가스를 압축시킨다. 제2 압축기(220)에 의해 압축된 증발가스의 일부는 열교환기(100)로 보내지고, 나머지는 제1 엔진(E1)으로 보내진다. 제1 엔진(E1)은 제2 엔진(E2)보다 높은 압력의 증발가스를 연료로 사용하는 엔진이며, ME-GI 엔진일 수 있다.The second compressor (220) of this embodiment compresses the remaining evaporative gas that has not been sent to the first decompressor (310) among the evaporated gases compressed by the first compressor (210). A part of the evaporated gas compressed by the second compressor 220 is sent to the heat exchanger 100 and the rest is sent to the first engine E1. The first engine E1 is an engine that uses an evaporation gas at a pressure higher than that of the second engine E2 as fuel, and may be an ME-GI engine.

본 실시예의 제1 압축기(210)에 의해 압축된 증발가스의 일부는 제2 엔진(E2)으로 보내질 수도 있다. 즉, 제1 압축기(210)에 의해 압축된 증발가스는 세 흐름으로 분기하여, 한 흐름은 제1 감압장치(310)로 보내지고, 다른 흐름은 제2 엔진(E2)으로 보내지고, 나머지 흐름은 제2 압축기(220)로 보내질 수 있다. 제2 엔진(E2)은 제1 엔진(E1)보다 낮은 압력의 증발가스를 연료로 사용하는 엔진이며, DF 엔진일 수 있다.A part of the evaporated gas compressed by the first compressor 210 of the present embodiment may be sent to the second engine E2. That is, the evaporated gas compressed by the first compressor 210 branches to three flows, one flow is sent to the first decompression device 310, the other flow is sent to the second engine E2, May be sent to the second compressor (220). The second engine E2 is an engine using the evaporation gas of lower pressure than the first engine E1 as fuel, and may be a DF engine.

본 실시예의 제2 감압장치(320)는, 제1 압축기(210) 및 제2 압축기(220)에 의해 압축된 후 열교환기(100)에 의해 냉각된 증발가스를 팽창시킨다. 제1 압축기(210) 및 제2 압축기(220)에 의한 압축과정, 열교환기(100)에 의한 냉각과정, 및 제2 감압장치(320)에 의한 팽창과정을 거친 증발가스는, 일부 또는 전부가 재액화된다. 제2 감압장치(320)는, 줄-톰슨 밸브 등의 팽창밸브일 수 있다.The second decompression device 320 of the present embodiment expands the evaporated gas cooled by the heat exchanger 100 after being compressed by the first compressor 210 and the second compressor 220. The evaporation gas, which has undergone the compression process by the first compressor 210 and the second compressor 220, the cooling process by the heat exchanger 100, and the expansion process by the second decompressor 320, And is re-liquefied. The second pressure reducing device 320 may be an expansion valve such as a line-Thomson valve.

본 실시예의 선박용 증발가스 재액화 시스템은, 기액분리기(600)를 더 포함할 수 있다. 본 실시예의 기액분리기(600)는, 제2 감압장치(320) 후단에 설치되어, 제1 압축기(210)와 제2 압축기(220)에 의한 압축 과정, 열교환기(100)에 의한 냉각 과정, 및 제2 감압장치(320)에 의한 팽창 과정을 거쳐 일부 또는 전부 재액화 된 유체를, 액화천연가스와 기체 상태의 증발가스로 분리시킨다.The vessel evaporation gas re-liquefaction system of this embodiment may further include a gas-liquid separator 600. The gas-liquid separator 600 of this embodiment is provided at the downstream end of the second decompressor 320 and performs a compression process by the first compressor 210 and the second compressor 220, a cooling process by the heat exchanger 100, And the second decompressor 320 to separate the partially or fully re-liquefied fluid into liquefied natural gas and gaseous vaporized gas.

기액분리기(600)에 의해 분리된 액화천연가스는 저장탱크(T)로 보내질 수 있고, 기액분리기(600)에 의해 분리된 증발가스는 저장탱크(T)로부터 배출되는 증발가스와 합류되어 열교환기(100)본 실시예의 선박용로 보내질 수 있다.The liquefied natural gas separated by the gas-liquid separator 600 can be sent to the storage tank T. The evaporated gas separated by the gas-liquid separator 600 is combined with the evaporated gas discharged from the storage tank T, (100) can be sent to the ship of this embodiment.

기액분리기(600)로부터 액화천연가스가 배출되는 라인 상에는, 유체의 유량 및 개폐를 조절하는 제1 밸브(510)가 설치될 수 있고, 기액분리기(600)로부터 기체상태의 천연가스가 배출되는 라인 상에는, 유체의 유량 및 개폐를 조절하는 제2 밸브(520)가 설치될 수 있다.Liquid separator 600 may be provided with a first valve 510 for regulating the flow rate and opening and closing of the fluid and a line for discharging natural gas in a gaseous state from the gas- A second valve 520 for controlling the flow rate and opening / closing of the fluid may be installed.

본 실시예의 선박용 증발가스 재액화 시스템은, 제3 압축기(230)를 더 포함할 수 있다. 본 실시예의 제3 압축기(230)는, 제2 압축기(220) 후단에 설치되어, 제2 압축기(220)에 의해 압축된 증발가스를 추가적으로 압축시킨다.The evaporating gas re-liquefaction system for a ship of the present embodiment may further include a third compressor (230). The third compressor 230 of the present embodiment is installed downstream of the second compressor 220 to further compress the evaporated gas compressed by the second compressor 220.

본 실시예의 선박용 증발가스 재액화 시스템이 제3 압축기(230)를 포함하는 경우, 제1 압축기(210), 제2 압축기(220) 및 제3 압축기(230)에 의해 압축된 증발가스가 둘로 분기되어, 일부는 열교환기(100)로 보내지고, 나머지는 제1 엔진(E1)으로 보내진다.When the evaporative gas re-liquefaction system for a ship according to this embodiment includes the third compressor 230, the evaporated gas compressed by the first compressor 210, the second compressor 220 and the third compressor 230 is branched into two A part thereof is sent to the heat exchanger 100, and the rest is sent to the first engine E1.

본 실시예에서는 제2 압축기(220)에 의해 압축된 증발가스가 제3 압축기(230) 한 대에 의해서만 추가적으로 압축되는 경우를 예로 들어 설명하나, 제2 압축기(220)에 의해 압축된 증발가스는, 다수개의 압축기에 의해 다단계의 추가 압축 과정을 거친 후 두 흐름을 분기되어 일부는 열교환기(100)로 보내지고 나머지는 제1 엔진(E1)으로 보내질 수도 있다.In this embodiment, the evaporation gas compressed by the second compressor 220 is additionally compressed by only one compressor of the third compressor 230, but the evaporation gas compressed by the second compressor 220 is , A plurality of compressors may be subjected to a multi-stage further compression process, and then the two flows may be diverted and a part thereof may be sent to the heat exchanger 100 and the remainder may be sent to the first engine E1.

본 실시예의 선박용 증발가스 재액화 시스템은, 제4 압축기(240)를 더 포함할 수 있다. 본 실시예의 제4 압축기(240)는 제1 엔진(E1) 전단에 설치되어, 제1 압축기(210) 및 제2 압축기(220)에 의해 압축된 증발가스 중 열교환기(100)로 보내지지 않은 나머지 증발가스를 추가적으로 압축시킨 후 제1 엔진(E1)으로 공급한다.The ship evaporative-gas re-liquefaction system of this embodiment may further include a fourth compressor (240). The fourth compressor 240 of the present embodiment is installed at the front end of the first engine E1 and is disposed in the vicinity of the first compressor E1 in a state where the evaporated gas compressed by the first compressor 210 and the second compressor 220 is not sent to the heat exchanger 100 The remaining evaporation gas is further compressed and then supplied to the first engine E1.

본 실시예의 선박용 증발가스 재액화 시스템이 제3 압축기(230), 제4 압축기(240), 및 기액분리기(600)를 더 포함하고, 증발가스가 제1 엔진(E1) 및 제2 엔진(E2)으로 공급되는 경우, 유체의 흐름을 설명하면 다음과 같다.The evaporating gas re-liquefaction system of the present embodiment further comprises a third compressor 230, a fourth compressor 240 and a gas-liquid separator 600. The evaporation gas is supplied to the first engine E1 and the second engine E2 ), The flow of the fluid will be described as follows.

저장탱크(T)로부터 배출된 증발가스(b 라인)는 열교환기(100)로 보내져 냉매로 사용된 후 제1 압축기(210)로 보내진다. 제1 압축기(210)에 의해 압축된 증발가스는 세 흐름으로 분기되어, 일부는 제1 감압장치(310)로 보내지고, 다른 일부는 제2 엔진(E2)으로 보내지고, 나머지는 제2 압축기(220)로 보내진다.The evaporated gas (line b) discharged from the storage tank T is sent to the heat exchanger 100, used as a refrigerant, and then sent to the first compressor 210. The evaporated gas compressed by the first compressor 210 is branched into three flows, a part of which is sent to the first decompression device 310, the other part is sent to the second engine E2, (220).

제1 압축기(210)에 의해 압축된 후 제1 감압장치(310)에 의해 팽창된 증발가스(c 라인)는, 열교환기(100)에서 냉매로 사용된 후, 저장탱크(T)로부터 배출된 후 열교환기(100)에서 냉매로 사용된 증발가스(b 라인)와 합류된다. 제1 감압장치(310)에 의해 팽창된 후 열교환기(100)에서 냉매로 사용된 증발가스(c 라인)와 저장탱크(T)로부터 배출된 후 열교환기(100)에서 냉매로 사용된 증발가스(b 라인)가 합류된 흐름은, 제1 압축기(210)로 보내진다.The evaporated gas (c line) expanded by the first decompressor 310 after being compressed by the first compressor 210 is used as a refrigerant in the heat exchanger 100 and then discharged from the storage tank T And merges with the evaporation gas (line b) used as the refrigerant in the heat exchanger 100. The evaporation gas (c line) used as the refrigerant in the heat exchanger 100 after being expanded by the first decompressor 310 and the evaporation gas used as the refrigerant in the heat exchanger 100 after being discharged from the storage tank T (b line) is sent to the first compressor 210. [0054]

한편, 제1 압축기(210)에 의해 압축된 후 제2 압축기(220)에 의해 압축된 증발가스는, 제3 압축기(230)에 의해 추가적으로 압축된 후 두 흐름으로 분기된다.On the other hand, the evaporated gas compressed by the first compressor 210 and compressed by the second compressor 220 is further compressed by the third compressor 230 and then branched into two flows.

제3 압축기(230)에 의해 압축된 후 두 흐름으로 분기된 증발가스 중 일부(a 라인)는, 열교환기(100)에 의해 냉각된 후 제2 감압장치(320)에 의해 팽창된다. 제1 압축기(210), 제2 압축기(220), 및 제3 압축기(230)에 의한 압축 과정, 열교환기(100)에 의한 냉각 과정, 및 제2 감압장치(320)에 의한 팽창 과정을 거친 증발가스의 일부 또는 전부는 재액화되며, 기액분리기(600)에 의해 재액화된 액화천연가스와 기체상태로 남아있는 증발가스가 분리된다. 기액분리기(600)에 의해 분리된 액화천연가스는 저장탱크(T)로 보내질 수 있고, 기액분리기(600)에 의해 분리된 기체상태의 천연가스는 저장탱크(T)로부터 배출되는 증발가스(b 라인)과 합류되어 열교환기(100)로 보내질 수 있다.A portion (a line) of the evaporated gas that has been compressed by the third compressor 230 and then diverted into two flows is cooled by the heat exchanger 100 and then expanded by the second decompressor 320. The process of compression by the first compressor 210, the second compressor 220 and the third compressor 230, the cooling process by the heat exchanger 100 and the expansion process by the second decompressor 320 Some or all of the evaporated gas is re-liquefied, and the liquefied natural gas re-liquefied by the gas-liquid separator 600 and the evaporated gas remaining in the gaseous state are separated. The liquefied natural gas separated by the gas-liquid separator 600 can be sent to the storage tank T and the gaseous natural gas separated by the gas-liquid separator 600 is sent to the evaporation gas b Line) and may be sent to the heat exchanger 100.

제3 압축기(230)에 의해 압축된 후 두 흐름으로 분기된 증발가스 중 열교환기(100)로 보내지지 않은 나머지는, 제4 압축기(240)에 의해 압축된 후 제1 엔진(E1)으로 보내진다.The remainder of the evaporated gas that has been compressed by the third compressor 230 and branched to the two streams and is not sent to the heat exchanger 100 is compressed by the fourth compressor 240 and then sent to the first engine E1 Loses.

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.

T : 저장탱크 E1, E2 : 엔진
100 : 열교환기 210, 220, 230, 240 : 압축기
310, 320 : 감압장치 410 : 압신기
510, 520 : 밸브 600 : 기액분리기T: Storage tank E1, E2: Engine
100: heat exchanger 210, 220, 230, 240: compressor
310, 320: Decompression device 410: Compression device
510, 520: valve 600: gas-liquid separator

Claims (17)

1) 저장탱크로부터 배출된 증발가스를 압축시키고,
2) 상기 1)단계에서 압축된 증발가스의 일부를 팽창시키고,
3) 상기 1)단계에서 압축된 증발가스의 다른 일부를 추가적으로 압축시키고,
4) 상기 2)단계에서 팽창된 증발가스와, 상기 1)단계에서 상기 저장탱크로부터 배출된 증발가스를 냉매로, 상기 3)단계에서 추가적으로 압축된 증발가스를 열교환기에 의해 열교환시켜 냉각시키고,
5) 상기 4)단계에서 열교환되어 냉각된 유체를 팽창시키며,
상기 열교환기는 세 유로로 구성되어, 상기 2)단계에서 팽창된 증발가스와, 상기 1)단계에서 상기 저장탱크로부터 배출된 증발가스와, 상기 3)단계에서 추가적으로 압축된 증발가스가 동시에 열교환되는, 선박용 증발가스 재액화 방법.1) compressing the evaporated gas discharged from the storage tank,
2) expanding a part of the evaporated gas compressed in the step 1)
3) further compressing another portion of the evaporated gas compressed in the step 1)
4) The evaporation gas expanded in the step 2) and the evaporation gas discharged from the storage tank in the step 1) are heat-exchanged by the heat exchanger in the step 3)
5) expanding the heat-exchanged and cooled fluid in step 4)
Wherein the heat exchanger is composed of three flow paths, and the evaporation gas expanded in the step 2), the evaporation gas discharged from the storage tank in the step 1), and the evaporation gas further compressed in the step 3) A method for liquefaction of evaporation gas for ship. 청구항 1에 있어서,
상기 1)단계에서, 상기 2)단계에서 증발가스를 팽창시키며 생산된 동력을 사용하여 증발가스를 압축시키는, 선박용 증발가스 재액화 방법.The method according to claim 1,
The method of claim 1, wherein in the step (2), the evaporation gas is expanded and the evaporation gas is compressed using the generated power. 청구항 1에 있어서,
3-1) 상기 3)단계에서 추가적으로 압축된 증발가스를 한번 더 압축시키고,
상기 4)단계에서, 상기 2)단계에서 팽창된 증발가스와, 상기 1)단계에서 상기 저장탱크로부터 배출된 증발가스를 냉매로, 상기 3-1)단계에서 한번 더 압축된 증발가스를 열교환시켜 냉각시키며,
상기 2)단계에서 팽창된 증발가스와, 상기 1)단계에서 상기 저장탱크로부터 배출된 증발가스와, 상기 3-1)단계에서 한번 더 압축된 증발가스가 동시에 열교환되는, 선박용 증발가스 재액화 방법.The method according to claim 1,
3-1) further compressing the additional compressed vapor gas in step 3)
In the step 4), the evaporated gas expanded in the step 2) and the evaporated gas discharged from the storage tank in the step 1) are used as refrigerant, and the evaporated gas once more compressed in the step 3-1) is heat-exchanged Cooling,
Wherein the evaporation gas expanded in the step 2), the evaporation gas discharged from the storage tank in the step 1), and the evaporation gas once more compressed in the step 3-1) are heat-exchanged at the same time. . 청구항 1에 있어서,
상기 2)단계에서 팽창된 후 상기 4)단계에서 열교환의 냉매로 사용된 증발가스는, 상기 1)단계에서 상기 저장탱크로부터 배출된 후 상기 4)단계에서 열교환의 냉매로 사용된 증발가스와 합류되어, 상기 1)단계의 압축 과정을 거치는, 선박용 증발가스 재액화 방법.The method according to claim 1,
The evaporation gas used as the refrigerant for the heat exchange in the step 4) after the expansion in the step 2) is discharged from the storage tank in the step 1), and the evaporation gas used as the refrigerant for the heat exchange in the step 4) And the step (1) is followed by a compression step. 청구항 1 내지 청구항 4 중 어느 한 항에 있어서,
상기 3)단계에서 추가적으로 압축된 증발가스 중, 상기 4)단계의 냉각 과정을 거치지 않는 나머지 증발가스는, 한 번 더 압축된 후 제1 엔진으로 공급되는, 선박용 증발가스 재액화 방법.The method according to any one of claims 1 to 4,
Wherein the remaining evaporation gas that has not been subjected to the cooling process in the step 4) out of the additional compressed evaporation gas in the step 3) is further compressed and then supplied to the first engine. 청구항 1 내지 청구항 4 중 어느 한 항에 있어서,
상기 1)단계에서 압축된 증발가스 중, 상기 2)단계의 팽창 과정 또는 상기 3)단계의 추가적인 압축 과정을 거치지 않는 나머지 증발가스는, 제2 엔진으로 공급되는, 선박용 증발가스 재액화 방법.The method according to any one of claims 1 to 4,
Wherein the remaining evaporation gas not subjected to the expansion process of the step 2) or the additional compression process of the step 3) among the evaporation gases compressed in the step 1) is supplied to the second engine. 청구항 1 내지 청구항 4 중 어느 한 항에 있어서,
6) 상기 5)단계에서 팽창된 유체를 액화가스와 기체 상태의 증발가스로 분리하고,
상기 6)단계에서 분리된 액화가스는 상기 저장탱크로 보내지는, 선박용 증발가스 재액화 방법.The method according to any one of claims 1 to 4,
6) separating the fluid expanded in the step 5) into a liquefied gas and an evaporated gas in a gaseous state,
The liquefied gas separated in the step (6) is sent to the storage tank. 청구항 7에 있어서,
상기 6)단계에서 분리된 기체 상태의 증발가스는, 상기 1)단계에서 상기 저장탱크로부터 배출되는 증발가스와 합류된 후, 상기 4)단계에서 열교환의 냉매로 사용되는, 선박용 증발가스 재액화 방법.The method of claim 7,
The evaporation gas in the gaseous state separated in the step 6) is used as a refrigerant for heat exchange in the step 4) after merging with the evaporation gas discharged from the storage tank in the step 1) . 저장탱크로부터 배출된 증발가스를 압축시키는 제1 압축기;
상기 제1 압축기에 의해 압축된 증발가스의 일부를 팽창시키는 제1 감압장치;
상기 제1 압축기에 의해 압축된 증발가스의 다른 일부를 압축시키는 제2 압축기;
상기 저장탱크로부터 배출된 증발가스와, 상기 제1 감압장치에 의해 팽창된 증발가스를 냉매로 사용하여, 상기 제2 압축기에 의해 압축된 증발가스를 열교환시켜 냉각시키는 열교환기; 및
상기 열교환기에 의해 냉각된 증발가스를 팽창시키는 제2 감압장치;를 포함하고,
상기 열교환기는 세 유로로 구성되어, 상기 저장탱크로부터 배출된 증발가스와, 상기 제1 감압장치에 의해 팽창된 증발가스와, 상기 제2 압축기에 의해 압축된 증발가스가 동시에 열교환되는, 선박용 증발가스 재액화 시스템.A first compressor for compressing the evaporated gas discharged from the storage tank;
A first decompression device for expanding a part of the evaporated gas compressed by the first compressor;
A second compressor for compressing another portion of the evaporated gas compressed by the first compressor;
A heat exchanger that uses the evaporation gas discharged from the storage tank and the evaporation gas expanded by the first decompressor as a refrigerant to heat exchange the evaporation gas compressed by the second compressor to cool the evaporation gas; And
And a second decompression device for expanding the evaporated gas cooled by the heat exchanger,
Wherein the heat exchanger is made up of three flow paths, and the evaporation gas discharged from the storage tank, the evaporation gas expanded by the first decompression device, and the evaporation gas compressed by the second compressor are heat- Re-liquefaction system. 청구항 9에 있어서,
상기 제1 압축기와 상기 제1 감압장치는 압신기를 형성하는, 선박용 증발가스 재액화 시스템.The method of claim 9,
Wherein the first compressor and the first decompressor form a compressing device. 청구항 9에 있어서,
상기 제2 압축기에 의해 압축된 증발가스를 추가로 압축시키는 제3 압축기를 더 포함하고,
상기 열교환기는, 상기 저장탱크로부터 배출된 증발가스와, 상기 제1 감압장치에 의해 팽창된 증발가스를 냉매로 사용하여, 상기 제3 압축기에 의해 압축된 증발가스를 열교환시켜 냉각시키며,
상기 저장탱크로부터 배출된 증발가스와, 상기 제1 감압장치에 의해 팽창된 증발가스와, 상기 제3 압축기에 의해 압축된 증발가스가 동시에 열교환되는, 선박용 증발가스 재액화 시스템.The method of claim 9,
Further comprising a third compressor for further compressing the evaporated gas compressed by the second compressor,
Wherein the heat exchanger uses the evaporation gas discharged from the storage tank and the evaporation gas expanded by the first decompression device as a refrigerant to heat the evaporation gas compressed by the third compressor to cool the evaporation gas,
Wherein the evaporation gas discharged from the storage tank, the evaporation gas expanded by the first decompression device, and the evaporation gas compressed by the third compressor are simultaneously heat-exchanged. 청구항 9에 있어서,
상기 저장탱크로부터 배출된 후 상기 열교환기의 냉매로 사용된 증발가스는, 상기 제1 감압장치에 의해 팽창된 후 상기 열교환기의 냉매로 사용된 증발가스와 합류되어, 상기 제1 압축기에 의해 압축되는, 선박용 증발가스 재액화 시스템.The method of claim 9,
The evaporation gas used as the refrigerant of the heat exchanger after being discharged from the storage tank is expanded by the first decompression device and merged with the evaporation gas used as the refrigerant of the heat exchanger, The evaporative gas re-liquefaction system for ships. 청구항 9 내지 청구항 12 중 어느 한 항에 있어서,
상기 제2 압축기에 의해 압축된 증발가스 중, 상기 열교환기로 보내지지 않은 증발가스를 압축시키는 제4 압축기를 더 포함하고,
상기 제4 압축기에 의해 압축된 증발가스는 제1 엔진으로 보내지는, 선박용 증발가스 재액화 시스템.The method according to any one of claims 9 to 12,
And a fourth compressor for compressing the evaporated gas not compressed by the second compressor and not sent to the heat exchanger,
And the evaporated gas compressed by the fourth compressor is sent to the first engine. 청구항 9 내지 청구항 12 중 어느 한 항에 있어서,
상기 제1 압축기에 의해 압축된 증발가스 중, 상기 제1 감압장치 또는 상기 제2 압축기로 보내지지 않은 나머지 증발가스는 제2 엔진으로 보내지는, 선박용 증발가스 재액화 시스템.The method according to any one of claims 9 to 12,
Wherein the remaining evaporated gas not sent to the first decompressor or the second compressor among the evaporated gases compressed by the first compressor is sent to the second engine. 청구항 9 내지 청구항 12 중 어느 한 항에 있어서,
상기 제2 감압장치에 의해 팽창된 유체를 액화가스와 기체 상태의 증발가스로 분리하는 기액분리기를 더 포함하고,
상기 기액분리기에 의해 분리된 액화가스는 상기 저장탱크로 보내지는, 선박용 증발가스 재액화 시스템.The method according to any one of claims 9 to 12,
Further comprising a gas-liquid separator for separating the fluid expanded by said second decompression device into a liquefied gas and an evaporated gas in gaseous state,
And the liquefied gas separated by the gas-liquid separator is sent to the storage tank. 청구항 15에 있어서,
상기 기액분리기에 의해 분리된 기체 상태의 증발가스는, 상기 저장탱크로부터 배출된 증발가스와 합류되어, 상기 열교환기의 냉매로 사용되는, 선박용 증발가스 재액화 시스템.16. The method of claim 15,
Wherein the gaseous evaporated gas separated by the gas-liquid separator is combined with the evaporated gas discharged from the storage tank and used as a refrigerant of the heat exchanger. 삭제delete
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