KR20240021358A - System and Method for Recovering Boil-Off Gas of Carbon Dioxide of Liquefied Carbon Dioxide Carrier - Google Patents

System and Method for Recovering Boil-Off Gas of Carbon Dioxide of Liquefied Carbon Dioxide Carrier Download PDF

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KR20240021358A
KR20240021358A KR1020220099441A KR20220099441A KR20240021358A KR 20240021358 A KR20240021358 A KR 20240021358A KR 1020220099441 A KR1020220099441 A KR 1020220099441A KR 20220099441 A KR20220099441 A KR 20220099441A KR 20240021358 A KR20240021358 A KR 20240021358A
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South Korea
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gas
boil
carbon dioxide
fuel
heat exchanger
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KR1020220099441A
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Korean (ko)
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황순규
김필근
장재형
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한화오션 주식회사
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Priority to KR1020220099441A priority Critical patent/KR20240021358A/en
Publication of KR20240021358A publication Critical patent/KR20240021358A/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
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B17/00—Vessels parts, details, or accessories, not otherwise provided for
    • B63B17/0027—Tanks for fuel or the like ; Accessories therefor, e.g. tank filler caps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
    • B63J2/12—Heating; Cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0209—Hydrocarbon fuels, e.g. methane or acetylene
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0245—High pressure fuel supply systems; Rails; Pumps; Arrangement of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
    • 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
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/026—Special adaptations of indicating, measuring, or monitoring equipment having the temperature as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C6/00—Methods and apparatus for filling vessels not under pressure with liquefied or solidified gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0027—Oxides of carbon, e.g. CO2
    • 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
    • F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
    • F25J1/008—Hydrocarbons
    • 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
    • F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
    • F25J1/0095—Oxides of carbon, e.g. CO2
    • 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
    • F25J1/0221—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 the cold stored in an external cryogenic component in an open 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
    • F25J1/0243—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
    • 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
    • F17C2221/01—Pure fluids
    • F17C2221/013—Carbone dioxide
    • 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
    • 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
    • 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
    • F17C2227/0341—Heat exchange with the fluid by cooling using another 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
    • F17C2265/032—Treating the boil-off by recovery
    • F17C2265/033—Treating the boil-off by recovery with cooling
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    • 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
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    • F17C2265/038—Treating the boil-off by recovery with expanding
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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
    • F17C2270/0105—Ships
    • 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
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    • F25J2210/00—Processes characterised by the type or other details of the feed stream
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    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/90—Boil-off gas from storage
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    • F25J2230/30—Compression of the feed stream
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    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/02—Recycle of a stream in general, e.g. a by-pass stream
    • 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

본 발명은 액체상태의 이산화탄소가 기화하여 생성된 증발가스를 효과적으로 회수할 수 있는 이산화탄소의 증발가스 처리 시스템 및 방법, 그리고 이산화탄소의 증발가스 처리 시스템을 포함하는 액화이산화탄소 운반선에 관한 것이다.
본 발명에 따른 이산화탄소의 증발가스 처리 시스템은, 이산화탄소 저장탱크로부터 배출되는 증발가스를 압축하는 증발가스 압축기; 상기 이산화탄소 저장탱크로부터 증발가스 압축기로 공급되는 증발가스를 냉매로 사용하여, 상기 증발가스 압축기에서 압축된 압축 증발가스를 냉각시키는 제1 열교환기; 및 상기 제1 열교환기에서 냉각된 증발가스를, 연료탱크로부터 엔진의 연료로서 공급되는 액화가스와의 열교환에 의해 추가 냉각시키는 제2 열교환기;를 포함한다. The present invention relates to a system and method for treating carbon dioxide boil-off gas that can effectively recover boil-off gas generated by vaporizing liquid carbon dioxide, and a liquefied carbon dioxide carrier including a carbon dioxide boil-off gas treatment system.
The system for treating evaporative gas of carbon dioxide according to the present invention includes: a evaporative gas compressor that compresses evaporative gas discharged from a carbon dioxide storage tank; A first heat exchanger that cools the compressed boil-off gas compressed in the boil-off gas compressor by using boil-off gas supplied from the carbon dioxide storage tank to the boil-off gas compressor as a refrigerant; and a second heat exchanger that further cools the boil-off gas cooled in the first heat exchanger by heat exchange with liquefied gas supplied as fuel to the engine from the fuel tank.

Figure P1020220099441
Figure P1020220099441

Description

액화이산화탄소 운반선의 이산화탄소 증발가스 처리 시스템 및 방법 {System and Method for Recovering Boil-Off Gas of Carbon Dioxide of Liquefied Carbon Dioxide Carrier}System and method for treating carbon dioxide boil-off gas of liquefied carbon dioxide carrier {System and Method for Recovering Boil-Off Gas of Carbon Dioxide of Liquefied Carbon Dioxide Carrier}

본 발명은 액체상태의 이산화탄소가 기화하여 생성된 증발가스를 효과적으로 회수할 수 있는 이산화탄소의 증발가스 처리 시스템 및 방법, 그리고 이산화탄소의 증발가스 처리 시스템을 포함하는 액화이산화탄소 운반선에 관한 것이다. The present invention relates to a system and method for treating carbon dioxide boil-off gas that can effectively recover boil-off gas generated by vaporizing liquid carbon dioxide, and a liquefied carbon dioxide carrier including a carbon dioxide boil-off gas treatment system.

화석 연료의 사용 증가에 따라 대량으로 배출되는 이산화탄소는 지구온난화 현상을 야기하는 온실가스(GHG; Greenhouse Gas)중 하나로 지정되어 있다. Carbon dioxide, which is emitted in large quantities as the use of fossil fuels increases, is designated as one of the greenhouse gases (GHG) that causes global warming.

이산화탄소의 지구온난화지수는 다른 온실가스와 비교하면 낮은 편이지만, 전체 온실가스 배출의 약 80%를 차지한다는 점과, 배출량을 규제할 수 있다는 점에서 매우 중요한 온실가스로 분류되고 있다. Although the global warming potential of carbon dioxide is low compared to other greenhouse gases, it is classified as a very important greenhouse gas in that it accounts for about 80% of all greenhouse gas emissions and that emissions can be regulated.

다양한 국제 협약을 통하여 각국에서는 이산화탄소의 배출을 저감하도록 규제하고 있다. 이로부터 파생되는 기술 중 하나로 각종 산업현장에서 발생되는 이산화탄소를 회수하여 별도의 장소에 격리 저장함으로써, 대기 중에 방출되는 이산화탄소량을 저감시키는 이산화탄소 처리 기술이 등장하게 되었다.Through various international agreements, each country regulates the reduction of carbon dioxide emissions. As one of the technologies derived from this, carbon dioxide treatment technology has emerged, which reduces the amount of carbon dioxide emitted into the atmosphere by recovering carbon dioxide generated from various industrial sites and storing it in isolation.

각종 회수 공정을 거쳐 배출가스로부터 분리 농축된 이산화탄소는 운반의 편의성을 고려하여 냉각 압축에 의해 액화된 상태에서 운반될 수 있다. Carbon dioxide that has been separated and concentrated from exhaust gas through various recovery processes can be transported in a liquefied state by cold compression for convenience of transportation.

대용량 액화이산화탄소 운반선(Large CO2 Carrier)은 현재 개발 단계로서, 실선 적용되고 있는 사례는 아직 찾아보기 어렵지만, 액화된 이산화탄소의 수송 거리가 1,000km 이상인 경우에는 파이프를 이용하는 것보다 선박을 이용하는 것이 경제적으로 유리한 것으로 알려지고 있다. The Large Capacity Liquefied Carbon Dioxide Carrier (Large CO 2 Carrier) is currently in the development stage, and it is difficult to find cases where it is being applied live. However, if the transport distance of liquefied carbon dioxide is more than 1,000 km, it is more economical to use ships rather than pipes. It is known to be advantageous.

이산화탄소의 장거리 수송을 위한 수송수단으로서 선박, 즉, 이산화탄소 운반선은 고압, 저온으로 냉각된 액체 이산화탄소가 운반되는 동안에 액화상태를 유지할 수 있는 기술이 적용된 저장시설을 갖추어야 한다. As a means of transportation for long-distance transport of carbon dioxide, ships, that is, carbon dioxide carriers, must be equipped with storage facilities equipped with technology that can maintain the liquefied state of liquid carbon dioxide cooled to high pressure and low temperature while being transported.

액화천연가스 등 고압, 저온의 액화가스를 운반하기 위한 액화가스 운반선과, 액화가스 운반선에 마련되며 고압, 저온의 액화가스를 저장 및 운반할 수 있는 다양한 저장 기술이 공지되어 있다. 기존에 알려져 있는 액화가스 저장탱크에는 공통적으로 온도 조절 장치와 압력 조절 장치가 장착된다. Liquefied gas carriers for transporting high-pressure, low-temperature liquefied gas, such as liquefied natural gas, and various storage technologies provided on liquefied gas carriers to store and transport high-pressure, low-temperature liquefied gas are known. Previously known liquefied gas storage tanks are commonly equipped with temperature control devices and pressure control devices.

액화가스를 수송하는 과정 중에, 열 침입에 의해 저장탱크에 저장되어 있는 액체가 팽창하거나 기화되어 압력이 증가하는 문제가 있다. 저장탱크의 압력이 일정 범위 이상으로 상승하면 저장탱크에 크랙이 발생하거나 폭발이 일어나는 등의 심각한 안전 사고가 발생할 수 있다. During the process of transporting liquefied gas, there is a problem in that the liquid stored in the storage tank expands or vaporizes due to heat intrusion, causing an increase in pressure. If the pressure in the storage tank rises above a certain range, serious safety accidents such as cracks or explosions in the storage tank may occur.

이러한 사고를 방지하고자, 액화가스 저장탱크에 장착된 온도 조절 장치 및 압력 조절 장치를 이용하여, 저장탱크의 내압이 일정 압력에 도달하면, 기화된 가스(증발가스, BOG; Boil-Off Gas)를 저장탱크로부터 배출시킴으로써, 내부 압력을 안전 범위 내에서 유지시킬 수 있다. In order to prevent such accidents, the temperature control device and pressure control device installed in the liquefied gas storage tank are used to control vaporized gas (boil-off gas, BOG; Boil-Off Gas) when the internal pressure of the storage tank reaches a certain pressure. By discharging from the storage tank, the internal pressure can be maintained within a safe range.

한편, 대용량 액화이산화탄소 운반선의 추진엔진으로는 기존의 가스엔진을 적용하는 것이 고려되고 있다. 가스엔진의 연료로는 천연가스를 사용하며, 천연가스는 액체상태(액화천연가스)로 연료탱크에 저장하였다가, 연료 공급 시스템을 이용하여 기화시킨 후, 엔진에 연료로서 공급할 수 있다. Meanwhile, the use of existing gas engines as a propulsion engine for large-capacity liquefied carbon dioxide carriers is being considered. Natural gas is used as fuel for gas engines, and natural gas can be stored in a liquid state (liquefied natural gas) in a fuel tank, vaporized using a fuel supply system, and then supplied as fuel to the engine.

또한, 액화이산화탄소를 운반하는 과정에서 발생하는 이산화탄소의 증발가스를 처리하는 방법으로서, 이산화탄소의 증발가스를 재액화시켜 다시 액화이산화탄소 저장탱크로 회수하는 방법을 고려해 볼 수 있다. Additionally, as a method of treating the evaporation gas of carbon dioxide generated in the process of transporting liquefied carbon dioxide, a method of re-liquefying the evaporation gas of carbon dioxide and recovering it back to the liquefied carbon dioxide storage tank can be considered.

기존의 액화가스 운반선의 참고하면, 액화천연가스를 엔진에 연료로 공급하는 과정에서 발생하는 기화열을 이산화탄소 증발가스의 재액화에 필요한 냉열로 활용함으로써, 재액화 증발가스를 회수하는 방법을 고려해볼 수 있을 것이다. Referring to existing liquefied gas carriers, a method of recovering the re-liquefied boil-off gas can be considered by utilizing the heat of vaporization generated in the process of supplying liquefied natural gas as fuel to the engine as the cold heat needed to re-liquefy the carbon dioxide boil-off gas. There will be.

일반적인 상황에서 이산화탄소 증발가스의 재액화량을 엔진의 부하, 즉 엔진으로 공급하는 천연가스의 유량에 따라 조절한다면, 이산화탄소와 천연가스의 열용량을 고려했을 때 이산화탄소 증발가스를 재액화시키는 것이 가능하다. In a general situation, if the re-liquefaction amount of carbon dioxide boil-off gas is adjusted according to the load of the engine, that is, the flow rate of natural gas supplied to the engine, it is possible to re-liquefy the carbon dioxide boil-off gas considering the heat capacity of carbon dioxide and natural gas.

그러나, BOR(boil-off rate)이 높아지는 운항 상황에서는, 생성된 증발가스의 양이 증가하여 결국 액화가스의 기화열만으로는 전량 재액화는 불가능할 것이며, 액화이산화탄소 저장탱크의 압력상승을 막을 수 없는 경우가 발생하게 된다. However, in operating situations where the BOR (boil-off rate) increases, the amount of boil-off gas generated increases, and eventually, it will be impossible to re-liquefy the entire amount using only the heat of vaporization of the liquefied gas, and there may be cases where the pressure increase in the liquefied carbon dioxide storage tank cannot be prevented. It happens.

한편, 엔진의 부하 대신 이산화탄소 증발가스량에 따라 천연가스의 기화량을 조절하는 경우, 즉, 이산화탄소 증발가스를 전량 재액화시키기 위해 엔진에서 요구하는 천연가스의 유량보다 더 많은 양의 액화천연가스를 기화시켜 기화열을 회수하더라도, 기화기의 용량한계 등에 따라 가용 가능한 액화천연가스량은 한정되어 있고, 결국 이산화탄소 증발가스를 전량 액화시키는 것을 불가능하다는 문제가 남아있다. On the other hand, when the vaporization amount of natural gas is adjusted according to the amount of carbon dioxide evaporation gas instead of the engine load, that is, in order to re-liquefy all of the carbon dioxide evaporation gas, a larger amount of liquefied natural gas is vaporized than the flow rate of natural gas required by the engine. Even if the heat of vaporization is recovered, the amount of liquefied natural gas available is limited due to the capacity limit of the vaporizer, and ultimately, there remains a problem that it is impossible to liquefy the entire amount of carbon dioxide boil-off gas.

따라서, 본 발명은 상술한 문제점을 해결하는 것을 목적으로 하며, 특히, 이산화탄소의 증발가스를 전량 재액화시킬 수 있는 이산화탄소의 증발가스 처리 시스템 및 방법, 그리고 이산화탄소 증발가스 처리 시스템을 포함하는 액화이산화탄소 운반선을 제공하고자 한다. Therefore, the present invention aims to solve the above-mentioned problems, and in particular, a carbon dioxide boil-off gas treatment system and method capable of re-liquefying the entire carbon dioxide boil-off gas, and a liquefied carbon dioxide carrier including a carbon dioxide boil-off gas treatment system. We would like to provide.

상술한 목적을 달성하기 위한 본 발명의 일 측면에 의하면, 이산화탄소 저장탱크로부터 배출되는 증발가스를 압축하는 증발가스 압축기; 상기 이산화탄소 저장탱크로부터 증발가스 압축기로 공급되는 증발가스를 냉매로 사용하여, 상기 증발가스 압축기에서 압축된 압축 증발가스를 냉각시키는 제1 열교환기; 및 상기 제1 열교환기에서 냉각된 증발가스를, 연료탱크로부터 엔진의 연료로서 공급되는 액화가스와의 열교환에 의해 추가 냉각시키는 제2 열교환기;를 포함하는, 이산화탄소의 증발가스 처리 시스템이 제공된다. According to one aspect of the present invention for achieving the above-described object, an evaporation gas compressor that compresses evaporation gas discharged from a carbon dioxide storage tank; A first heat exchanger that cools the compressed boil-off gas compressed in the boil-off gas compressor by using the boil-off gas supplied from the carbon dioxide storage tank to the boil-off gas compressor as a refrigerant; and a second heat exchanger that further cools the boil-off gas cooled in the first heat exchanger by heat exchange with liquefied gas supplied from the fuel tank as fuel for the engine. .

바람직하게는, 상기 제2 열교환기에서 냉각된 증발가스가 고체 상태로 상변화하지 않도록 제2 열교환기에서 냉각되는 증발가스의 온도를 조절하기 위한 제어수단;을 더 포함할 수 있다.Preferably, it may further include a control means for controlling the temperature of the boil-off gas cooled in the second heat exchanger so that the boil-off gas cooled in the second heat exchanger does not change phase into a solid state.

바람직하게는, 상기 제어수단은, 상기 제2 열교환기에서 냉각되어 배출되는 증발가스의 온도를 측정하는 제1 온도 측정부; 및 상기 제1 온도 측정부의 온도 측정값에 따라, 상기 제2 열교환기를 우회하는 증발가스의 유량을 제어하는 제1 증발가스 우회밸브;를 포함할 수 있다.Preferably, the control means includes: a first temperature measuring unit that measures the temperature of the boil-off gas cooled and discharged from the second heat exchanger; and a first boil-off gas bypass valve that controls the flow rate of boil-off gas bypassing the second heat exchanger according to the temperature measurement value of the first temperature measuring unit.

바람직하게는, 상기 엔진으로 공급되는 가스연료의 압력을 측정하는 압력 측정부; 상기 압력 측정부의 압력 측정값에 따라 상기 연료탱크로 재순환시킬 액화가스의 유량을 조절하기 위한 연료 재순환 밸브; 및 상기 압력 측정부의 압력 측정값에 따라 상기 제2 열교환기를 우회하는 증발가스의 유량을 제어하는 제1 증발가스 우회밸브;를 포함할 수 있다.Preferably, a pressure measuring unit that measures the pressure of gas fuel supplied to the engine; a fuel recirculation valve for controlling the flow rate of liquefied gas to be recirculated into the fuel tank according to the pressure measurement value of the pressure measuring unit; and a first boil-off gas bypass valve that controls the flow rate of boil-off gas bypassing the second heat exchanger according to the pressure measurement value of the pressure measuring unit.

바람직하게는, 상기 제2 열교환기에서 냉각된 증발가스를 감압시켜 과냉각시키는 증발가스 감압밸브; 상기 증발가스 감압밸브에서 감압된 증발가스를 기액분리하는 증발가스 분리기; 상기 증발가스 분리기에서 분리된 액체 상태의 재액화 증발가스를 상기 이산화탄소 저장탱크로 회수하는 증발가스 회수라인; 및 상기 증발가스 분리기에서 분리된 기체 상태의 증발가스를 상기 제1 열교환기로 재순환시키는 증발가스 재순환라인;을 더 포함할 수 있다.Preferably, an evaporation gas pressure reducing valve for supercooling the evaporation gas cooled in the second heat exchanger by reducing the pressure; A boil-off gas separator that separates gas and liquid from the boil-off gas whose pressure is reduced by the boil-off gas pressure reducing valve; A boil-off gas recovery line that recovers the re-liquefied boil-off gas separated in the boil-off gas separator into the carbon dioxide storage tank; And it may further include a boil-off gas recirculation line that recirculates the gaseous boil-off gas separated in the boil-off gas separator to the first heat exchanger.

상술한 목적을 달성하기 위한 본 발명의 다른 일 측면에 의하면, 가스연료를 연료로서 사용하는 엔진; 상기 엔진에 공급할 가스연료를 액체상태로 저장하는 연료탱크; 상기 연료탱크에 저장된 액체상태의 가스연료를 엔진에서 요구하는 압력 및 온도 조건으로 조절하여 상기 엔진에 공급하는 연료 공급부; 및 상기 이산화탄소의 증발가스 처리 시스템;을 포함하고, 상기 연료 공급부 및 증발가스 처리 시스템은 상기 제2 열교환기를 공유하는, 액화이산화탄소 운반선이 제공된다. According to another aspect of the present invention for achieving the above-described object, an engine using gas fuel as fuel; a fuel tank that stores gaseous fuel to be supplied to the engine in a liquid state; a fuel supply unit that adjusts the liquid gas fuel stored in the fuel tank to the pressure and temperature conditions required by the engine and supplies it to the engine; and a evaporation gas treatment system for carbon dioxide, wherein the fuel supply unit and the evaporation gas treatment system share the second heat exchanger.

또한, 상술한 목적을 달성하기 위한 본 발명의 또 다른 일 측면에 의하면, 이산화탄소 저장탱크로부터 배출되는 증발가스의 냉열을 회수하는 냉열 회수단계; 상기 냉열 회수단계에서 냉열이 회수된 증발가스를 압축하는 증발가스 압축단계; 상기 증발가스 압축단계에서 압축된 압축 증발가스를 상기 냉열 회수단계로 공급하여, 증발가스의 냉열에 의해 냉각시키는 제1 냉각단계; 및 상기 제1 냉각단계에서 냉각된 압축 증발가스를, 엔진의 연료로서 공급되는 액화가스와의 열교환에 의해 추가 냉각시켜 전량 재액화시키는 제2 냉각단계;를 포함하는, 이산화탄소의 증발가스 처리 방법이 제공된다. In addition, according to another aspect of the present invention for achieving the above-described object, a cold heat recovery step of recovering cold heat of boil-off gas discharged from a carbon dioxide storage tank; A boil-off gas compression step of compressing the boil-off gas from which the cold heat is recovered in the cold heat recovery step; A first cooling step of supplying the compressed boil-off gas compressed in the boil-off gas compression step to the cold heat recovery step and cooling it by the cold heat of the boil-off gas; And a second cooling step of further cooling the compressed boil-off gas cooled in the first cooling step by heat exchange with the liquefied gas supplied as fuel for the engine to re-liquefy the entire amount. do.

바람직하게는, 상기 제1 냉각단계 및 제2 냉각단계에서 냉각되는 증발가스가 얼지 않도록 상기 제2 냉각단계에서 냉각되는 증발가스의 온도를 조절하는 제어단계;를 더 포함할 수 있다.Preferably, it may further include a control step of adjusting the temperature of the evaporated gas cooled in the first cooling step and the second cooling step so that the evaporated gas cooled in the second cooling step does not freeze.

바람직하게는, 상기 엔진으로 공급되는 가스연료의 압력을 측정하는 압력 측정단계; 상기 압력 측정단계에서 측정한 압력 측정값이 미리 설정된 압력보다 높으면, 상기 제2 냉각단계로 공급하는 액화가스의 유량을 감소시키는 연료 재순환단계; 및 상기 압력 측정단계에서 측정한 압력 측정값이 미리 설정된 압력보다 높으면, 제2 냉각단계로 공급하는 증발가스의 유량을 감소시키는 유량 조절단계;를 더 포함할 수 있다.Preferably, a pressure measuring step of measuring the pressure of gas fuel supplied to the engine; If the pressure measurement value measured in the pressure measurement step is higher than the preset pressure, a fuel recirculation step of reducing the flow rate of the liquefied gas supplied to the second cooling step; And if the pressure measurement value measured in the pressure measurement step is higher than the preset pressure, a flow rate adjustment step of reducing the flow rate of the boil-off gas supplied to the second cooling step.

바람직하게는, 상기 제어단계는, 상기 제2 냉각단계에서 냉각된 압축 증발가스의 온도를 측정하는 제1 온도 측정단계; 및 상기 제1 온도 측정단계에서 측정한 온도 측정값이 미리 설정된 온도보다 낮으면, 상기 제2 냉각단계로 공급하는 증발가스의 유량을 감소시키는 제1 우회단계;를 포함할 수 있다. Preferably, the control step includes: a first temperature measurement step of measuring the temperature of the compressed boil-off gas cooled in the second cooling step; And if the temperature measurement value measured in the first temperature measurement step is lower than the preset temperature, a first bypass step of reducing the flow rate of the boil-off gas supplied to the second cooling step.

본 발명에 따른 이산화탄소의 증발가스 처리 시스템 및 방법, 그리고 액화이산화탄소 운반선은, 엔진의 부하 또는 이산화탄소 저장탱크의 BOR에 관계없이, 이산화탄소 증발가스를 전량 재액화시켜 회수할 수 있다. The system and method for processing carbon dioxide boil-off gas and the liquefied carbon dioxide carrier according to the present invention can re-liquefy and recover the entire amount of carbon dioxide boil-off gas, regardless of the load of the engine or the BOR of the carbon dioxide storage tank.

또한, 이산화탄소 증발가스를 재액화시키는 과정에서 이산화탄소가 드라이 아이스로 상변화하는 것을 방지할 수 있다. Additionally, during the process of re-liquefying carbon dioxide evaporation gas, it is possible to prevent carbon dioxide from changing into dry ice.

도 1은 본 발명의 일 실시예에 따른 이산화탄소의 증발가스 처리 시스템을 간략하게 도시한 계통도이다. 1 is a schematic diagram briefly illustrating a system for treating carbon dioxide evaporation gas according to an embodiment of the present invention.

본 발명의 동작상 이점 및 본 발명의 실시에 의하여 달성되는 목적을 충분히 이해하기 위해서는 본 발명의 바람직한 실시예를 예시하는 첨부도면 및 첨부도면에 기재된 내용을 참조하여야만 한다.In order to fully understand the operational advantages of the present invention and the objectives achieved by practicing the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

이하 첨부한 도면을 참조하여 본 발명의 바람직한 실시예에 대해 구성 및 작용을 상세히 설명하면 다음과 같다. 여기서 각 도면의 구성요소들에 대해 참조 부호를 부가함에 있어 동일한 구성요소들에 한해서는 비록 다른 도면상에 표시되더라도 가능한 한 동일한 부호로 표기되었음에 유의하여야 한다. 또한, 하기 실시예는 여러 가지 다른 형태로 변형될 수 있으며, 본 발명의 범위가 하기 실시예에 한정되는 것은 아니다.Hereinafter, the structure and operation of a preferred embodiment of the present invention will be described in detail with reference to the attached drawings. Here, in adding reference numerals to components in each drawing, it should be noted that identical components are indicated with the same reference numerals as much as possible, even if they are shown in different drawings. Additionally, the following examples may be modified into various other forms, and the scope of the present invention is not limited to the following examples.

후술하는 본 발명에서 운송수단은, 액화이산화탄소 저장탱크가 구비되며 육상 또는 해상의 경로를 통해 수송 가능한 것일 수 있다. 이하 본 발명의 일 실시예를 설명하는데 있어서 운송수단은 해상을 운항하는 선박인 것을 예로 들어 설명하기로 한다. In the present invention, which will be described later, the means of transportation may be equipped with a liquefied carbon dioxide storage tank and capable of being transported through land or sea routes. Hereinafter, in explaining an embodiment of the present invention, an example will be given where the means of transportation is a ship sailing on the sea.

또한, 본 발명의 일 실시예들에서 선박은, 액화이산화탄소 운반선(LCO2 Carrier)일 수 있다. 그러나 이에 한정하지는 않고 액화이산화탄소 저장탱크가 구비되는 선박이라면 후술하는 실시예들이 동일하게 적용될 수 있다. Additionally, in one embodiment of the present invention, the ship may be a liquefied carbon dioxide carrier (LCO 2 Carrier). However, it is not limited to this, and the embodiments described later can be equally applied to any ship equipped with a liquefied carbon dioxide storage tank.

또한, 본 명세서에서 선박이라 함은, 자체 추진 능력을 갖는 선박을 비롯하여, 추진 능력을 갖지는 않지만 해상에 부유하고 있는 해상 구조물도 포함할 수 있다. In addition, the term "ship" in this specification may include ships with self-propulsion capabilities, as well as offshore structures that do not have propulsion capabilities but are floating on the sea.

또한, 후술하는 본 발명의 일 실시예에 따른 액화이산화탄소 운반선에는 추진용 엔진 또는 발전용 엔진으로서, 가스연료 및 연료유(fuel oil)를 선택적으로 또는 혼합하여 연료로서 사용할 수 있는 이중연료 엔진이 하나 이상 마련될 수 있다. In addition, the liquefied carbon dioxide carrier according to an embodiment of the present invention, which will be described later, has one dual fuel engine that can be used as fuel as a propulsion engine or power generation engine, selectively or by mixing gas fuel and fuel oil. More can be provided.

여기서 가스연료는 액화된 상태, 즉 액화가스의 형태로 선내 연료탱크에 저장되어 있을 수 있으며, 기화시켜 가스 상태, 또는 액체상태 그대로 엔진에 공급될 수 있다. 예를 들어 액화가스는, LNG(Liquefied Natural Gas), LEG(Liquefied Ethane Gas), LPG(Liquefied Petroleum Gas), 액화에틸렌가스(Liquefied Ethylene Gas), 액화프로필렌가스(Liquefied Propylene Gas) 등과 같은 탄화수소 계열은 물론, 액화 암모니아(NH3), 액화수소 등 비탄화수소 계열의 액화가스 중에서 선택될 수 있다.Here, the gas fuel may be stored in the ship's fuel tank in a liquefied state, that is, in the form of liquefied gas, and may be vaporized and supplied to the engine in a gaseous or liquid state. For example, liquefied gas is a hydrocarbon series such as LNG (Liquefied Natural Gas), LEG (Liquefied Ethane Gas), LPG (Liquefied Petroleum Gas), Liquefied Ethylene Gas, and Liquefied Propylene Gas. Of course, it may be selected from non-hydrocarbon-based liquefied gases such as liquefied ammonia (NH 3 ) and liquefied hydrogen.

후술하는 본 발명의 일 실시예에 있어서 가스연료는, 천연가스 또는 암모니아인 것을 예로 들어 설명한다. 즉, 후술하는 본 발명의 일 실시예들에 있어서 연료탱크에는 액화천연가스 또는 액화암모니아가 저장되어 있을 수 있다. In an embodiment of the present invention described later, the gas fuel will be explained by taking natural gas or ammonia as an example. That is, in one embodiment of the present invention described later, liquefied natural gas or liquefied ammonia may be stored in the fuel tank.

또한, 여기서 엔진은 이중연료 엔진(Dual Fuel Engine)으로서, 선박에 사용되는 엔진 중 천연가스 또는 암모니아를 연료로 사용할 수 있다. 예를 들어, 엔진은, ME-GI(MAN Electronic Gas Injection) 엔진, X-DF(eXtra long stroke Dual Fuel) 엔진, DF 엔진(DFDE(Dual Fuel Diesel Electric), DFDG(Dual Fuel Diesel Generator)) 중 어느 하나 이상을 포함할 수 있다. 그러나 이에 한정하는 것은 아니다. Additionally, the engine here is a dual fuel engine, and among engines used in ships, natural gas or ammonia can be used as fuel. For example, the engines include ME-GI (MAN Electronic Gas Injection) engines, It may contain more than one. However, it is not limited to this.

이하, 도 1을 참조하여 본 발명의 일 실시예에 따른 이산화탄소의 증발가스 처리 시스템 및 방법, 그리고 이를 포함하는 액화이산화탄소 운반선을 설명한다. Hereinafter, a system and method for treating carbon dioxide boil-off gas according to an embodiment of the present invention, and a liquefied carbon dioxide carrier including the same will be described with reference to FIG. 1.

본 실시예에 따른 액화이산화탄소 운반선은, 액화이산화탄소를 저장하는 하나 이상의 이산화탄소 저장탱크(100)와, 이산화탄소 저장탱크(100)에 저장된 액화이산화탄소가 기화하여 생성된 증발가스를 재액화시켜 이산화탄소 저장탱크(100)로 회수하는 증발가스 처리부와, 선박의 추진용 엔진과 발전용 엔진 중 어느 하나 이상을 포함하며 한 대 이상 마련되는 엔진(400)과, 엔진(400)에 공급할 가스연료로서 액화가스를 저장하는 연료탱크(300)와, 연료탱크(300)에 저장된 액화가스를 엔진(400)에서 요구하는 압력 및 온도 조건으로 조절하여 공급하는 연료 공급부가 구비될 수 있다. The liquefied carbon dioxide carrier according to this embodiment includes one or more carbon dioxide storage tanks 100 for storing liquefied carbon dioxide, and a carbon dioxide storage tank ( 100), an engine 400 provided with one or more evaporative gas processing units, including at least one of a ship's propulsion engine and a power generation engine, and storing liquefied gas as gas fuel to be supplied to the engine 400. It may be provided with a fuel tank 300 and a fuel supply unit that supplies the liquefied gas stored in the fuel tank 300 by adjusting it to the pressure and temperature conditions required by the engine 400.

본 실시예의 증발가스 처리부 및 연료 공급부는 제2 열교환기(230)를 공유하고, 후술하는 제어수단에 의해 서로 유기적으로 연계하여 제어된다. In this embodiment, the boil-off gas processing unit and the fuel supply unit share the second heat exchanger 230, and are controlled in organic connection with each other by a control means described later.

본 실시예의 연료 공급부는, 연료탱크(300)에 저장된 액화가스를 배출시켜 엔진(400)으로 이송하는 연료펌프(310)와, 연료펌프(310)에 의해 엔진(400)의 연료로 이송되는 액화가스의 냉열을 회수하는 제2 열교환기(230)와, 제2 열교환기(230)에서 냉열이 회수되면서 기화된 가스연료를 엔진(400)에서 요구하는 압력으로 압축하는 연료 압축기(320)와, 연료 압축기(320)에서 압축된 가스연료를 엔진(400)에서 요구하는 온도로 조절해주는 연료 냉각기(330)를 포함할 수 있다.The fuel supply unit of this embodiment includes a fuel pump 310 that discharges the liquefied gas stored in the fuel tank 300 and transfers it to the engine 400, and a liquefied gas that is transferred to the fuel of the engine 400 by the fuel pump 310. A second heat exchanger 230 that recovers the cold heat of the gas, a fuel compressor 320 that compresses the gas fuel vaporized while recovering the cold heat in the second heat exchanger 230 to the pressure required by the engine 400, It may include a fuel cooler 330 that adjusts the gas fuel compressed in the fuel compressor 320 to the temperature required by the engine 400.

연료탱크(300)로부터 배출된 액화가스는 연료 공급라인(FL)을 따라 유동하면서, 연료펌프(310)에 의해 가압되어 제2 열교환기(230)로 이송되고, 제2 열교환기(230)에서 이산화탄소 증발가스와 열교환하여 기화된 후, 연료 압축기(320)에서 엔진(400)에서 요구하는 압력으로 압축된다. 압축된 가스연료는 연료 냉각기(330)에서 온도가 조절되어, 엔진(400)에서 요구하는 압력 및 온도의 상태로 연료로서 엔진(400)에 공급된다. The liquefied gas discharged from the fuel tank 300 flows along the fuel supply line (FL), is pressurized by the fuel pump 310, and is transferred to the second heat exchanger 230. After being vaporized by heat exchange with carbon dioxide evaporation gas, it is compressed in the fuel compressor 320 to the pressure required by the engine 400. The temperature of the compressed gas fuel is adjusted in the fuel cooler 330 and supplied to the engine 400 as fuel at the pressure and temperature required by the engine 400.

본 실시예에 따르면, 엔진(400)의 부하(load)에 따라 연료탱크(300)로부터 연료펌프(310)로 흡입되는 액화가스의 유량, 즉 제2 열교환기(230)로 유입되는 액화가스의 유량이 결정될 수 있다. According to this embodiment, the flow rate of the liquefied gas sucked from the fuel tank 300 to the fuel pump 310 according to the load of the engine 400, that is, the flow rate of the liquefied gas flowing into the second heat exchanger 230 The flow rate can be determined.

본 실시예의 증발가스 처리부는, 이산화탄소 저장탱크(100)로부터 배출되는 증발가스를 압축하는 증발가스 압축기(210)와, 증발가스 압축기(210)의 상류에 마련되며 증발가스 압축기(210)로 공급되는 증발가스(이하, 제1 스트림(F1)이라고 함)의 냉열을 회수하는 제1 열교환기(220)를 포함한다. The boil-off gas processing unit of this embodiment is provided upstream of the boil-off gas compressor 210 and the boil-off gas compressor 210, which compresses the boil-off gas discharged from the carbon dioxide storage tank 100, and supplies the boil-off gas to the compressor 210. It includes a first heat exchanger 220 that recovers the cold heat of the boil-off gas (hereinafter referred to as the first stream F1).

본 실시예에서 제1 열교환기(220)에서 냉매로 사용되면서 온도가 상승한 증발가스(이하, 제2 스트림(F2)이라고 함)는, 증발가스 공급라인(BL)을 따라 증발가스 압축기(210)로 공급된다. 증발가스 압축기(210)에 의해 압축된 증발가스(이하, 제3 스트림(F3)이라고 함)는, 증발가스 공급라인(BL)을 따라 제1 열교환기(220)로 공급되며, 제1 열교환기(220)에서는 제3 스트림(F3)과 증발가스 압축기(210)로 공급되는 증발가스, 즉 제1 스트림(F1)과의 열교환에 의해 제3 스트림(F3)이 냉각된다. In this embodiment, the boil-off gas (hereinafter referred to as the second stream (F2)) whose temperature has risen while being used as a refrigerant in the first heat exchanger 220 is sent to the boil-off gas compressor 210 along the boil-off gas supply line BL. is supplied as The boil-off gas compressed by the boil-off gas compressor 210 (hereinafter referred to as the third stream F3) is supplied to the first heat exchanger 220 along the boil-off gas supply line BL. In (220), the third stream (F3) is cooled by heat exchange between the third stream (F3) and the boil-off gas supplied to the boil-off gas compressor (210), that is, the first stream (F1).

또한, 본 실시예에 따르면, 제1 열교환기(220)에서 제1 스트림(F1)과의 열교환에 의해 1차 냉각된 증발가스(이하, 제4 스트림(F4)이라고 함)는 증발가스 공급라인(BL)을 따라 제2 열교환기(230)로 공급되며, 제2 열교환기(230)에서는 제4 스트림(F4)과 연료 압축기(320)로 공급되는 액화가스와의 열교환에 의해 제4 스트림(F4)이 냉각된다. In addition, according to this embodiment, the boil-off gas (hereinafter referred to as the fourth stream (F4)) first cooled by heat exchange with the first stream (F1) in the first heat exchanger 220 is supplied to the boil-off gas supply line. It is supplied to the second heat exchanger 230 along (BL), and in the second heat exchanger 230, the fourth stream (F4) is generated by heat exchange between the fourth stream (F4) and the liquefied gas supplied to the fuel compressor (320). F4) is cooled.

본 실시예의 증발가스 처리부는, 제2 열교환기(230)에서 냉각된 증발가스를 이산화탄소 저장탱크(100)에 재공급할 수 있는 압력으로 감압시키는 증발가스 감압밸브(240)와, 증발가스 감압밸브(240)에 의해 감압된 증발가스 중에서 액체 상태의 재액화 증발가스와 기체 상태의 증발가스를 기액분리하는 증발가스 분리기(250)를 더 포함한다. The boil-off gas processing unit of this embodiment includes an boil-off gas pressure reducing valve 240 that reduces the pressure of the boil-off gas cooled in the second heat exchanger 230 to a pressure that can be re-supplied to the carbon dioxide storage tank 100, and a boil-off gas pressure reducing valve ( It further includes a boil-off gas separator 250 that separates gas-liquid re-liquefied boil-off gas in a liquid state and boil-off gas in a gaseous state among the boil-off gas depressurized by 240).

이산화탄소 저장탱크(100)에서 생성된 이산화탄소 증발가스는, 증발가스 공급라인(BL)을 따라 유동하면서, 제1 열교환기(220)에서 냉열이 회수된 후, 증발가스 압축기(210)에서 압축되고, 압축된 증발가스는 제1 열교환기(220)에서 1차 냉각된 후 제2 열교환기(230)에서 2차 냉각된다. The carbon dioxide boil-off gas generated in the carbon dioxide storage tank 100 flows along the boil-off gas supply line (BL), recovers cold heat in the first heat exchanger 220, and is compressed in the boil-off gas compressor 210, The compressed boil-off gas is first cooled in the first heat exchanger 220 and then secondarily cooled in the second heat exchanger 230.

제2 열교환기(230)에서 추가로 냉각된 증발가스는 액체 상태일 수 있으며, 증발가스 감압밸브(240)에서 감압되면서 온도가 더 낮아져 과냉각 상태가 되거나, 감압되는 과정에서 플래시 가스가 생성되어 기액혼합상태가 될 수 있다. 기액혼합 상태의 증발가스는 증발가스 분리기(250)에서 기액분리된다. The evaporation gas additionally cooled in the second heat exchanger 230 may be in a liquid state, and as the pressure is reduced in the evaporation gas pressure reducing valve 240, the temperature is further lowered to a supercooled state, or flash gas is generated in the process of decompression to form a gas-liquid state. It can be a mixed state. The boil-off gas in the gas-liquid mixed state is separated into gas and liquid in the boil-off gas separator 250.

증발가스 분리기(250)에서 분리된 액체 상태의 재액화 증발가스는, 증발가스 분리기(250)로부터 이산화탄소 저장탱크(100)로 연결되는 증발가스 회수라인(BL1)을 따라 이송되어 이산화탄소 저장탱크(100)로 회수될 수 있다.The re-liquefied boil-off gas in a liquid state separated from the boil-off gas separator 250 is transferred along the boil-off gas recovery line BL1 connected from the boil-off gas separator 250 to the carbon dioxide storage tank 100 and stored in the carbon dioxide storage tank 100. ) can be recovered.

또한, 증발가스 분리기(250)에서 분리된 기체 상태의 증발가스는, 증발가스 분리기(250)로부터 제1 열교환기(220) 상류의 증발가스 공급라인(BL)으로 연결되는 증발가스 재순환라인(BL2)을 따라 이송되어 제1 열교환기(220)로 재순환될 수 있다. In addition, the gaseous boil-off gas separated in the boil-off gas separator 250 is connected to the boil-off gas recirculation line BL2 connected from the boil-off gas separator 250 to the boil-off gas supply line BL upstream of the first heat exchanger 220. ) can be transported along and recirculated to the first heat exchanger 220.

본 실시예의 증발가스 압축기(210)는, 증발가스 압축기(210)에 의해 압축된 이산화탄소 증발가스가, 증발가스 공급라인(BL)을 따라 제1 열교환기(220) 및 제2 열교환기(230) 중 어느 하나 이상을 거친 후 증발가스 감압밸브(240)에 의해 감압되는 과정에서, 적어도 일부가 액화될 수 있는 압력으로 증발가스를 압축할 수 있다. In the boil-off gas compressor 210 of this embodiment, the carbon dioxide boil-off gas compressed by the boil-off gas compressor 210 flows through the first heat exchanger 220 and the second heat exchanger 230 along the boil-off gas supply line BL. In the process of reducing the pressure by the boil-off gas pressure reducing valve 240 after passing through one or more of the boil-off gases, the boil-off gas can be compressed to a pressure at which at least part of it can be liquefied.

본 실시예의 증발가스 감압밸브(240)는 줄-톰슨 밸브일 수 있다. 본 실시예서 증발가스는 증발가스 감압밸브(240)에 의해 감압되는 동시에, 줄-톰슨 효과에 의해, 증발가스 감압밸브(240)의 도입 온도보다 더 낮은 온도에 도달하게 되는데, 이 과정에서 플래시 가스가 발생할 수 있다. The boil-off gas pressure reducing valve 240 of this embodiment may be a Joule-Thompson valve. In this embodiment, the boil-off gas is reduced in pressure by the boil-off gas pressure reducing valve 240, and at the same time, due to the Joule-Thomson effect, it reaches a lower temperature than the introduction temperature of the boil-off gas pressure reducing valve 240. In this process, the flash gas may occur.

즉, 본 실시예에 제2 열교환기(230)로부터 증발가스 감압밸브(240)로 이송되는 증발가스는 전량이 액체 상태일 수 있고, 증발가스 감압밸브(240)를 통과하면서 과냉각 상태가 되면서 플래시 가스가 생성될 수 있다. That is, in this embodiment, the entire amount of the boil-off gas transferred from the second heat exchanger 230 to the boil-off gas pressure reducing valve 240 may be in a liquid state, and as it passes through the boil-off gas pressure reducing valve 240, it becomes supercooled and flashes. Gas may be produced.

증발가스 감압밸브(240)에 의해 감압되는 과정에서 발생한 플래시 가스와 과냉각 상태의 재액화 증발가스가 혼합된 기액혼합물은 증발가스 분리기(250)에서 기액분리된다. The gas-liquid mixture of the flash gas generated in the process of reducing pressure by the boil-off gas pressure reducing valve 240 and the re-liquefied boil-off gas in a supercooled state is separated into gas and liquid in the boil-off gas separator 250.

본 실시예에 따르면, 엔진(400)의 연료로 공급되는 액화가스의 냉열에, 추가로 이산화탄소 저장탱크(100)로부터 배출되어 증발가스 처리부로 공급되는 극저온의 증발가스의 냉열을 회수하여 증발가스를 재액화하는 냉매로서 단계적으로 사용함으로써, 이산화탄소 증발가스의 재액화 공정의 효율을 개선하여 액화량을 증대시킴으로써, 이산화탄소 저장탱크(100)의 압력 상승을 효과적으로 제어할 수 있다. According to this embodiment, in addition to the cold heat of the liquefied gas supplied as fuel for the engine 400, the cold heat of the cryogenic boil-off gas discharged from the carbon dioxide storage tank 100 and supplied to the boil-off gas treatment unit is recovered to produce boil-off gas. By using it step by step as a reliquefying refrigerant, the efficiency of the reliquefaction process of carbon dioxide boil-off gas is improved and the amount of liquefaction is increased, thereby effectively controlling the pressure increase in the carbon dioxide storage tank 100.

본 실시예에 따르면, 엔진(400)의 연료로 공급되는 액화가스의 전량이 제2 열교환기(230)에서 이산화탄소 증발가스를 재액화시키는 냉매로서 사용된다. According to this embodiment, the entire amount of liquefied gas supplied as fuel for the engine 400 is used as a refrigerant to re-liquefy carbon dioxide boil-off gas in the second heat exchanger 230.

그런데, 본 실시예와 같이 제2 열교환기(230)에서 액화가스의 냉열로 압축 증발가스를 추가 냉각시키는 경우, 엔진(400)의 부하가 증가하여 제2 열교환기(230)로 공급되는 액화가스의 유량이 증가하거나, 이산화탄소 저장탱크(100)로부터 증발가스 생성량이 감소하는 등 제2 열교환기(230)에서 열교환하는 유체의 유량이 변동되면, 증발가스가 액화되는 과정에서 과도하게 냉각되어, 삼중점에 도달하거나, 고체 상태의 드라이 아이스가 형성될 수 있다. However, when the compressed boil-off gas is additionally cooled by the cold heat of the liquefied gas in the second heat exchanger 230 as in the present embodiment, the load on the engine 400 increases and the liquefied gas supplied to the second heat exchanger 230 If the flow rate of the fluid exchanging heat in the second heat exchanger 230 changes, such as an increase in the flow rate or a decrease in the amount of boil-off gas generated from the carbon dioxide storage tank 100, the boil-off gas is excessively cooled in the process of liquefying, and reaches the triple point. or solid dry ice may be formed.

본 실시예에 따르면, 증발가스를 재액화시키는 과정에서 드라이 아이스가 형성되는 문제를 방지하기 위한 제어수단을 더 포함한다. According to this embodiment, a control means for preventing the problem of dry ice being formed during the process of re-liquefying the boil-off gas is further included.

본 실시예의 제어수단은, 증발가스 공급라인(BL)에 구비되며 제2 열교환기(230)로부터 열교환 후 배출되는 증발가스의 온도를 측정하는 제1 온도 측정부(530)와, 제1 온도 측정부(530)의 온도 측정값에 따라 제어되며 제2 열교환기(230)를 우회하는 증발가스의 유량을 조절하기 위한 제1 증발가스 우회밸브(540)를 포함할 수 있다. The control means of this embodiment includes a first temperature measurement unit 530 provided in the boil-off gas supply line BL and measuring the temperature of the boil-off gas discharged after heat exchange from the second heat exchanger 230, and a first temperature measurement unit. It is controlled according to the temperature measurement value of the unit 530 and may include a first boil-off gas bypass valve 540 for controlling the flow rate of boil-off gas bypassing the second heat exchanger 230.

본 실시예의 제1 증발가스 우회밸브(540)는, 제2 열교환기(230) 상류의 증발가스 공급라인(BL)으로부터 분기되어 제2 열교환기(230) 하류의 증발가스 공급라인(BL)으로 연결되는 제1 증발가스 우회라인(BL3)에 구비될 수 있다. The first boil-off gas bypass valve 540 of this embodiment is branched from the boil-off gas supply line (BL) upstream of the second heat exchanger 230 to the boil-off gas supply line (BL) downstream of the second heat exchanger 230. It may be provided in the connected first boil-off gas bypass line (BL3).

본 실시예에 따르면, 제1 온도 측정부(530)에 의해 측정된 압축 증발가스의 온도가 미리 설정된 온도보다 낮아지는 경우, 제1 증발가스 우회밸브(540)를 개방하여, 증발가스의 적어도 일부가 제2 열교환기(230)에서 열교환하지 않고, 제2 열교환기(230) 하류의 증발가스 감압밸브(240)로 공급되도록 제어할 수 있다. According to this embodiment, when the temperature of the compressed boil-off gas measured by the first temperature measuring unit 530 is lower than the preset temperature, the first boil-off gas bypass valve 540 is opened, and at least a portion of the boil-off gas is released. It can be controlled so that it is supplied to the boil-off gas pressure reducing valve 240 downstream of the second heat exchanger 230, without exchanging heat in the second heat exchanger 230.

이와 같이 본 실시예에 따르면, 제2 열교환기(230)에서 냉각되는 증발가스의 온도에 따라 제2 열교환기(230)로 공급되는 증발가스의 유량을 조절함으로써, 증발가스가 과도하게 냉각되어 삼중점에 도달하지 않도록, 즉, 드라이 아이스가 생성되지 않도록 제어할 수 있다. According to this embodiment, by adjusting the flow rate of the boil-off gas supplied to the second heat exchanger 230 according to the temperature of the boil-off gas cooled in the second heat exchanger 230, the boil-off gas is excessively cooled to the triple point. It can be controlled so that it does not reach, that is, so that dry ice is not generated.

한편, 본 실시예에 따르면, 연료 냉각기(330) 하류의 연료 공급라인(FL)에 마련되며 엔진(400)으로 공급되는 가스연료의 압력을 측정하는 압력 측정부(510)와, 압력 측정부(510)의 압력 측정값에 따라 제어되며 연료펌프(310)에 의해 토출된 액화가스의 적어도 일부를 다시 연료탱크(300) 또는 연료펌프(310)의 상류로 재순환시키기 위한 연료 재순환 밸브(520)를 더 포함할 수 있다. Meanwhile, according to this embodiment, a pressure measuring unit 510 is provided in the fuel supply line (FL) downstream of the fuel cooler 330 and measures the pressure of the gas fuel supplied to the engine 400, and a pressure measuring unit ( It is controlled according to the pressure measurement value of 510 and includes a fuel recirculation valve 520 for recirculating at least a portion of the liquefied gas discharged by the fuel pump 310 back to the fuel tank 300 or upstream of the fuel pump 310. More may be included.

본 실시예의 연료 재순환 밸브(660)는, 연료펌프(310) 하류의 연료 공급라인(FL)으로부터 분기되어 연료탱크(300)로 연결되는 연료 재순환 라인(FL1)에 구비될 수 있다. The fuel recirculation valve 660 of this embodiment may be provided in the fuel recirculation line FL1 branched from the fuel supply line FL downstream of the fuel pump 310 and connected to the fuel tank 300.

트립 등 엔진(400)이 비정상적으로 작동하는 경우에는 엔진(400)으로의 가스연료 공급이 중단되며, 엔진(400) 입구의 가스연료 압력이 증가하게 된다. 본 실시예에 따르면, 엔진(400)의 입구 압력이 급격하게 상승하는 등 압력 측정부(510)의 압력 측정값이 미리 설정된 압력보다 높아지는 경우, 연료 재순환 밸브(520)를 개방하여 연료펌프(310)에 의해 토출된 액화가스의 적어도 일부가 다시 연료탱크(300)로 회수되도록 제어한다. When the engine 400 operates abnormally, such as a trip, the supply of gas fuel to the engine 400 is stopped, and the gas fuel pressure at the inlet of the engine 400 increases. According to this embodiment, when the pressure measurement value of the pressure measuring unit 510 becomes higher than the preset pressure, such as when the inlet pressure of the engine 400 suddenly increases, the fuel recirculation valve 520 is opened to pump the fuel pump 310. ) is controlled so that at least part of the liquefied gas discharged is recovered back to the fuel tank 300.

또한, 압력 측정부(510)의 압력 측정값이 미리 설정된 압력보다 높아지면, 제2 열교환기(230)로 공급되는 액화가스의 유량이 없거나 감소하므로, 제1 증발가스 우회밸브(540)를 개방하여, 증발가스의 적어도 일부가 제2 열교환기(230)에서 열교환하지 않고 우회하도록 제어할 수 있다. In addition, when the pressure measurement value of the pressure measuring unit 510 is higher than the preset pressure, the flow rate of the liquefied gas supplied to the second heat exchanger 230 is absent or reduced, so the first boil-off gas bypass valve 540 is opened. Thus, at least a portion of the boil-off gas can be controlled to bypass the second heat exchanger 230 without being heat-exchanged.

이와 같이 본 실시예에 따르면, 엔진(400)이 비정상적으로 작동할 때, 시스템을 Feed-Foward 제어하여, 연료펌프(310)에 의해 엔진(400) 측으로 공급되는 액화가스의 적어도 일부를 연료탱크(300) 또는 연료펌프(310)의 상류로 재순환시킨다. 또한, 엔진(400)이 비정상적으로 작동하면, 제2 열교환기(230)에서의 냉열용량이 부족해진다는 점을 고려하여, 제1 증발가스 우회밸브(540)를 개방함으로써 증발가스의 적어도 일부가 제2 열교환기(230)에서 열교환하지 않고 우회하도록 제어하여 재액화 공정을 중단할 수 있다. According to this embodiment, when the engine 400 operates abnormally, the system is controlled feed-forward, and at least part of the liquefied gas supplied to the engine 400 by the fuel pump 310 is stored in the fuel tank ( 300) or recirculate upstream of the fuel pump 310. In addition, in consideration of the fact that when the engine 400 operates abnormally, the cooling heat capacity in the second heat exchanger 230 becomes insufficient, at least a portion of the evaporative gas is released by opening the first evaporative gas bypass valve 540. The re-liquefaction process can be stopped by controlling the second heat exchanger 230 to bypass heat exchange without exchanging heat.

본 발명은 상기 실시예에 한정되지 않고, 본 발명의 기술적 요지를 벗어나지 아니하는 범위 내에서 다양하게 수정 또는 변형되어 실시될 수 있음은 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 있어서 자명한 것이다. It is obvious to those skilled in the art that the present invention is not limited to the above-mentioned embodiments, and that it can be implemented with various modifications or variations without departing from the technical gist of the present invention. It was done.

100 : 이산화탄소 저장탱크
210 : 증발가스 압축기 220 : 제1 열교환기
230 : 제2 열교환기 240 : 증발가스 감압밸브
250 : 증발가스 분리기
300 : 연료탱크 310 : 연료펌프
320 : 연료 압축기 330 : 연료 냉각기
400 : 엔진
510 : 압력 측정부 520 : 연료 재순환 밸브
530 : 제1 온도 측정부 540 : 제1 증발가스 우회밸브
BL : 증발가스 공급라인 BL1 : 증발가스 회수라인
BL2 : 증발가스 재순환라인 BL3 : 제1 증발가스 우회라인
FL : 연료 공급라인 FL1 : 연료 재순환라인
F1 : 제1 스트림 F2 : 제2 스트림
F3 : 제3 스트림 F4 : 제4 스트림 100: carbon dioxide storage tank
210: boil-off gas compressor 220: first heat exchanger
230: second heat exchanger 240: boil-off gas pressure reducing valve
250: Evaporation gas separator
300: fuel tank 310: fuel pump
320: fuel compressor 330: fuel cooler
400: Engine
510: pressure measuring unit 520: fuel recirculation valve
530: first temperature measuring unit 540: first evaporation gas bypass valve
BL: Boil-off gas supply line BL1: Boil-off gas recovery line
BL2: Boil-off gas recirculation line BL3: First boil-off gas bypass line
FL: Fuel supply line FL1: Fuel recirculation line
F1: first stream F2: second stream
F3: Third stream F4: Fourth stream

Claims (10)

이산화탄소 저장탱크로부터 배출되는 증발가스를 압축하는 증발가스 압축기;
상기 이산화탄소 저장탱크로부터 증발가스 압축기로 공급되는 증발가스를 냉매로 사용하여, 상기 증발가스 압축기에서 압축된 압축 증발가스를 냉각시키는 제1 열교환기; 및
상기 제1 열교환기에서 냉각된 증발가스를, 연료탱크로부터 엔진의 연료로서 공급되는 액화가스와의 열교환에 의해 추가 냉각시키는 제2 열교환기;를 포함하는, 이산화탄소의 증발가스 처리 시스템.A boil-off gas compressor that compresses the boil-off gas discharged from the carbon dioxide storage tank;
A first heat exchanger that cools the compressed boil-off gas compressed in the boil-off gas compressor by using the boil-off gas supplied from the carbon dioxide storage tank to the boil-off gas compressor as a refrigerant; and
A second heat exchanger that further cools the boil-off gas cooled in the first heat exchanger by heat exchange with liquefied gas supplied from the fuel tank as fuel for the engine. 청구항 1에 있어서,
상기 제2 열교환기에서 냉각된 증발가스가 고체 상태로 상변화하지 않도록 제2 열교환기에서 냉각되는 증발가스의 온도를 조절하기 위한 제어수단;을 더 포함하는, 이산화탄소의 증발가스 처리 시스템.In claim 1,
Control means for controlling the temperature of the boil-off gas cooled in the second heat exchanger so that the boil-off gas cooled in the second heat exchanger does not change phase into a solid state. 청구항 2에 있어서,
상기 제어수단은,
상기 제2 열교환기에서 냉각되어 배출되는 증발가스의 온도를 측정하는 제1 온도 측정부; 및
상기 제1 온도 측정부의 온도 측정값에 따라, 상기 제2 열교환기를 우회하는 증발가스의 유량을 제어하는 제1 증발가스 우회밸브;를 포함하는, 이산화탄소의 증발가스 처리 시스템.In claim 2,
The control means is,
a first temperature measuring unit that measures the temperature of the boil-off gas cooled and discharged from the second heat exchanger; and
A first boil-off gas bypass valve that controls the flow rate of boil-off gas bypassing the second heat exchanger according to the temperature measurement value of the first temperature measuring unit. 청구항 1에 있어서,
상기 엔진으로 공급되는 가스연료의 압력을 측정하는 압력 측정부;
상기 압력 측정부의 압력 측정값에 따라 상기 연료탱크로 재순환시킬 액화가스의 유량을 조절하기 위한 연료 재순환 밸브; 및
상기 압력 측정부의 압력 측정값에 따라 상기 제2 열교환기를 우회하는 증발가스의 유량을 제어하는 제1 증발가스 우회밸브;를 포함하는, 이산화탄소의 증발가스 처리 시스템.In claim 1,
a pressure measuring unit that measures the pressure of gas fuel supplied to the engine;
a fuel recirculation valve for controlling the flow rate of liquefied gas to be recirculated into the fuel tank according to the pressure measurement value of the pressure measuring unit; and
A first boil-off gas bypass valve that controls the flow rate of boil-off gas bypassing the second heat exchanger according to the pressure measurement value of the pressure measuring unit. 청구항 1에 있어서,
상기 제2 열교환기에서 냉각된 증발가스를 감압시켜 과냉각시키는 증발가스 감압밸브;
상기 증발가스 감압밸브에서 감압된 증발가스를 기액분리하는 증발가스 분리기;
상기 증발가스 분리기에서 분리된 액체 상태의 재액화 증발가스를 상기 이산화탄소 저장탱크로 회수하는 증발가스 회수라인; 및
상기 증발가스 분리기에서 분리된 기체 상태의 증발가스를 상기 제1 열교환기로 재순환시키는 증발가스 재순환라인;을 더 포함하는, 이산화탄소의 증발가스 처리 시스템.In claim 1,
an evaporation gas pressure reducing valve that depressurizes the evaporation gas cooled in the second heat exchanger and supercools it;
A boil-off gas separator that separates gas and liquid from the boil-off gas whose pressure is reduced by the boil-off gas pressure reducing valve;
A boil-off gas recovery line that recovers the re-liquefied boil-off gas separated in the boil-off gas separator into the carbon dioxide storage tank; and
A boil-off gas processing system for carbon dioxide, further comprising a boil-off gas recirculation line that recirculates the gaseous boil-off gas separated in the boil-off gas separator to the first heat exchanger. 가스연료를 연료로서 사용하는 엔진;
상기 엔진에 공급할 가스연료를 액체상태로 저장하는 연료탱크;
상기 연료탱크에 저장된 액체상태의 가스연료를 엔진에서 요구하는 압력 및 온도 조건으로 조절하여 상기 엔진에 공급하는 연료 공급부; 및
청구항 1 내지 5 중 어느 한 항에 기재된 이산화탄소의 증발가스 처리 시스템;을 포함하고,
상기 연료 공급부 및 증발가스 처리 시스템은 상기 제2 열교환기를 공유하는, 액화이산화탄소 운반선. Engines that use gas fuel as fuel;
a fuel tank that stores gaseous fuel to be supplied to the engine in a liquid state;
a fuel supply unit that adjusts the liquid gas fuel stored in the fuel tank to the pressure and temperature conditions required by the engine and supplies it to the engine; and
A carbon dioxide boil-off gas treatment system according to any one of claims 1 to 5,
The fuel supply unit and the boil-off gas treatment system share the second heat exchanger. 이산화탄소 저장탱크로부터 배출되는 증발가스의 냉열을 회수하는 냉열 회수단계;
상기 냉열 회수단계에서 냉열이 회수된 증발가스를 압축하는 증발가스 압축단계;
상기 증발가스 압축단계에서 압축된 압축 증발가스를 상기 냉열 회수단계로 공급하여, 증발가스의 냉열에 의해 냉각시키는 제1 냉각단계; 및
상기 제1 냉각단계에서 냉각된 압축 증발가스를, 엔진의 연료로서 공급되는 액화가스와의 열교환에 의해 추가 냉각시켜 전량 재액화시키는 제2 냉각단계;를 포함하는, 이산화탄소의 증발가스 처리 방법. A cold heat recovery step of recovering the cold heat of the boil-off gas discharged from the carbon dioxide storage tank;
A boil-off gas compression step of compressing the boil-off gas from which the cold heat is recovered in the cold heat recovery step;
A first cooling step of supplying the compressed boil-off gas compressed in the boil-off gas compression step to the cold heat recovery step and cooling it by the cold heat of the boil-off gas; and
A second cooling step of further cooling the compressed boil-off gas cooled in the first cooling step by heat exchange with liquefied gas supplied as fuel for the engine to re-liquefy the entire amount. 청구항 7에 있어서,
상기 제1 냉각단계 및 제2 냉각단계에서 냉각되는 증발가스가 얼지 않도록 상기 제2 냉각단계에서 냉각되는 증발가스의 온도를 조절하는 제어단계;를 더 포함하는, 이산화탄소의 증발가스 처리 방법.In claim 7,
A control step of adjusting the temperature of the boil-off gas cooled in the first cooling step and the second cooling step so that the boil-off gas cooled in the second cooling step does not freeze. 청구항 7에 있어서,
상기 엔진으로 공급되는 가스연료의 압력을 측정하는 압력 측정단계;
상기 압력 측정단계에서 측정한 압력 측정값이 미리 설정된 압력보다 높으면, 상기 제2 냉각단계로 공급하는 액화가스의 유량을 감소시키는 연료 재순환단계; 및
상기 압력 측정단계에서 측정한 압력 측정값이 미리 설정된 압력보다 높으면, 제2 냉각단계로 공급하는 증발가스의 유량을 감소시키는 유량 조절단계;를 더 포함하는, 이산화탄소의 증발가스 처리 방법.In claim 7,
A pressure measurement step of measuring the pressure of gas fuel supplied to the engine;
If the pressure measurement value measured in the pressure measurement step is higher than the preset pressure, a fuel recirculation step of reducing the flow rate of the liquefied gas supplied to the second cooling step; and
If the pressure measurement value measured in the pressure measurement step is higher than the preset pressure, a flow rate adjustment step of reducing the flow rate of the boil-off gas supplied to the second cooling step. Method for treating boil-off gas of carbon dioxide. 청구항 8에 있어서,
상기 제어단계는,
상기 제2 냉각단계에서 냉각된 압축 증발가스의 온도를 측정하는 제1 온도 측정단계; 및
상기 제1 온도 측정단계에서 측정한 온도 측정값이 미리 설정된 온도보다 낮으면, 상기 제2 냉각단계로 공급하는 증발가스의 유량을 감소시키는 제1 우회단계;를 포함하는, 이산화탄소의 증발가스 처리 방법.In claim 8,
The control step is,
A first temperature measurement step of measuring the temperature of the compressed boil-off gas cooled in the second cooling step; and
If the temperature measurement value measured in the first temperature measurement step is lower than the preset temperature, a first bypass step of reducing the flow rate of the boil-off gas supplied to the second cooling step; A method of treating boil-off gas of carbon dioxide, including .
KR1020220099441A 2022-08-09 2022-08-09 System and Method for Recovering Boil-Off Gas of Carbon Dioxide of Liquefied Carbon Dioxide Carrier KR20240021358A (en)

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