KR102156177B1 - Carbon dioxide pressurization system for carbon dioxide capture and storage - Google Patents

Carbon dioxide pressurization system for carbon dioxide capture and storage Download PDF

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KR102156177B1
KR102156177B1 KR1020180164459A KR20180164459A KR102156177B1 KR 102156177 B1 KR102156177 B1 KR 102156177B1 KR 1020180164459 A KR1020180164459 A KR 1020180164459A KR 20180164459 A KR20180164459 A KR 20180164459A KR 102156177 B1 KR102156177 B1 KR 102156177B1
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carbon dioxide
heat exchanger
refrigerant
pump
turbine
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KR1020180164459A
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KR20200075602A (en
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이범준
백영진
신형기
이길봉
조준현
노철우
조종재
최봉수
나호상
하피즈 알리 무하마드
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한국에너지기술연구원
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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
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
    • F25J3/0266—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
    • F01K25/103—Carbon 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
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • 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
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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
    • F25J1/0047—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 an "external" refrigerant stream in a closed vapor compression cycle
    • F25J1/0052—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 an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant 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
    • F25J1/006—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
    • F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
    • F25J1/0235—Heat exchange integration
    • F25J1/0242—Waste heat recovery, e.g. from heat of compression
    • 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.
    • 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
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/06—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation
    • F25J3/063—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream
    • F25J3/067—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream separation of carbon 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
    • F17C2221/01—Pure fluids
    • F17C2221/013—Carbone dioxide
    • 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
    • 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
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/80—Processes or apparatus involving steps for increasing the pressure of gaseous process streams the fluid being carbon dioxide
    • 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
    • F25J2235/00—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
    • F25J2235/80—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams the fluid being carbon dioxide
    • 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
    • F25J2240/00—Processes or apparatus involving steps for expanding of process streams
    • F25J2240/90—Hot gas waste turbine of an indirect heated gas for power generation
    • 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
    • F25J2260/00—Coupling of processes or apparatus to other units; Integrated schemes
    • F25J2260/02—Integration in an installation for exchanging heat, e.g. for waste heat recovery
    • 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
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/12—External refrigeration with liquid vaporising loop

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  • Engineering & Computer Science (AREA)
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  • General Engineering & Computer Science (AREA)
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  • Chemical & Material Sciences (AREA)
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Abstract

본 발명은, 기체 상태의 이산화탄소를 증기 압축 냉동 사이클을 이용하여 냉각하여 액체 상태로 상변화시킴으로써, 펌프를 통해 가압할 수 있으므로 압축기를 사용하는 경우에 비해 소요 동력이 감소될 수 있는 이점이 있다. 또한, 펌프를 통해 가압된 이산화탄소를 폐열을 이용해 가열함으로써, 초임계 상태의 이산화탄소를 이용하여 터빈을 구동하여 초임계 이산화탄소 발전할 수 있으므로, 시스템의 효율이 향상될 수 있다. In the present invention, gaseous carbon dioxide is cooled using a vapor compression refrigeration cycle and phase-changed into a liquid state, so that it can be pressurized through a pump, so that the required power can be reduced compared to the case of using a compressor. In addition, by heating the carbon dioxide pressurized through the pump using waste heat, supercritical carbon dioxide power generation can be generated by driving a turbine using carbon dioxide in a supercritical state, so that the efficiency of the system may be improved.

Description

이산화탄소 포집 및 저장을 위한 이산화탄소 가압 시스템{Carbon dioxide pressurization system for carbon dioxide capture and storage}Carbon dioxide pressurization system for carbon dioxide capture and storage

본 발명은 이산화탄소 포집 및 저장을 위한 이산화탄소 가압 시스템에 관한 것으로서, 보다 상세하게는 이산화탄소 포집 및 저장시 요구하는 고압의 이산화탄소를 얻기 위하여, 증기 압축 냉동 사이클을 이용하여 이산화탄소를 냉각하여 액화시킨 후 펌프를 통해 가압하고, 초임계 이산화탄소 발전부에서 폐열을 이용하여 이산화탄소를 가열하여 터빈을 구동함으로써, 가압 효율을 향상시킬 수 있는 이산화탄소 포집 및 저장을 위한 이산화탄소 가압 시스템을 제공하는 데 있다. The present invention relates to a carbon dioxide pressurization system for capturing and storing carbon dioxide, and more particularly, in order to obtain high-pressure carbon dioxide required for capturing and storing carbon dioxide, a pump is then cooled and liquefied using a vapor compression refrigeration cycle. It is to provide a carbon dioxide pressurization system for collecting and storing carbon dioxide capable of improving pressurization efficiency by pressurizing through and heating carbon dioxide using waste heat in a supercritical carbon dioxide power generation unit to drive a turbine.

지구온난화를 유발시키는 온실가스 중 대부분을 차지하고 있는 이산화탄소의 배출을 줄이기 위하여, 이산화탄소 포집 및 저장(CCS, Carbon dioxide capture & Storage) 기술이 활발히 연구되고 있다. In order to reduce the emission of carbon dioxide, which accounts for most of the greenhouse gases that cause global warming, carbon dioxide capture and storage (CCS) technology is being actively studied.

이산화탄소 포집 및 저장 기술은, 화석연료의 전환과정 등에서 발생한 이산화탄소를 대기로 배출하기 전에 고농도로 포집하고 압축한 후, 안전하게 이송하고 저장하는 기술이다.Carbon dioxide capture and storage technology is a technology that captures and compresses carbon dioxide generated in the process of converting fossil fuels to the atmosphere at a high concentration and then safely transports and stores it.

종래에는, 배기가스로부터 이산화탄소를 흡수탑 및 탈착탑을 이용하여 고농도로 포집하고, 대용량 압축기를 이용하여 고온 고압으로 압축하여 초임계 유체 상태로 변화시킨 후, 이송하여 저장하였다. Conventionally, carbon dioxide from exhaust gas was collected at high concentration using an absorption tower and a desorption tower, compressed at high temperature and high pressure using a large-capacity compressor, changed to a supercritical fluid state, and then transferred and stored.

그러나, 이산화탄소를 가압하기 위해서 대용량의 압축기를 사용해야 하기 때문에, 전력 소모가 매우 크고 비용이 많이 드는 문제점이 있다. However, since a large-capacity compressor must be used to pressurize carbon dioxide, power consumption is very high and cost is high.

한국등록특허 10-1498695호Korean Patent Registration No. 10-1498695

본 발명의 목적은, 이산화탄소의 가압 효율을 향상시킬 수 있는 이산화탄소 포집 및 저장을 위한 이산화탄소 가압 시스템을 제공하는 데 있다. An object of the present invention is to provide a carbon dioxide pressurization system for capturing and storing carbon dioxide capable of improving the pressurization efficiency of carbon dioxide.

본 발명에 따른 이산화탄소 포집 및 저장을 위한 이산화탄소 가압 시스템은, 기체 상태의 이산화탄소를 압축하는 이산화탄소 압축기와; 상기 이산화탄소 압축기와 연결되어, 상기 이산화탄소 압축기에서 압축된 이산화탄소를 냉매와 열교환시켜, 상기 이산화탄소를 냉각하여 액화시키는 냉매 열교환기와; 상기 냉매 열교환기와 연결되어, 상기 냉매 열교환기에서 나온 액체 상태의 이산화탄소를 펌핑하여, 상기 이산화탄소를 초임계 압력으로 가압하는 제1펌프와; 상기 제1펌프에서 가압된 이산화탄소를 폐열을 이용하여 가열시키는 폐열 열교환기와; 상기 폐열 열교환기에서 가열된 고온 고압의 이산화탄소에 의해 구동되는 터빈과; 상기 터빈에서 나온 이산화탄소를 냉각하여 액화시키는 냉각 열교환기와; 상기 냉각 열교환기에서 나온 고압이고 액체 상태의 이산화탄소를 이산화탄소 수요처로 배출하는 배출유로를 포함한다.A carbon dioxide pressurizing system for capturing and storing carbon dioxide according to the present invention includes a carbon dioxide compressor for compressing gaseous carbon dioxide; A refrigerant heat exchanger connected to the carbon dioxide compressor for exchanging carbon dioxide compressed by the carbon dioxide compressor with a refrigerant to cool and liquefy the carbon dioxide; A first pump connected to the refrigerant heat exchanger to pump carbon dioxide in a liquid state from the refrigerant heat exchanger to pressurize the carbon dioxide to a supercritical pressure; A waste heat heat exchanger for heating the carbon dioxide pressurized by the first pump using waste heat; A turbine driven by high temperature and high pressure carbon dioxide heated in the waste heat heat exchanger; A cooling heat exchanger for cooling and liquefying carbon dioxide from the turbine; It includes a discharge passage for discharging high pressure and liquid carbon dioxide from the cooling heat exchanger to a carbon dioxide consumer.

본 발명은, 기체 상태의 이산화탄소를 증기 압축 냉동 사이클을 이용하여 냉각하여 액체 상태로 상변화시킴으로써, 펌프를 통해 가압할 수 있으므로 이산화탄소를 저장시 요구되는 고압의 이산화탄소를 얻을 수 있으면서, 압축기를 사용하는 경우에 비해 소요 동력이 감소될 수 있는 이점이 있다.In the present invention, gaseous carbon dioxide can be cooled using a vapor compression refrigeration cycle to phase change into a liquid state, so that it can be pressurized through a pump, so that high-pressure carbon dioxide required for storing carbon dioxide can be obtained, while using a compressor. There is an advantage that the required power can be reduced compared to the case.

또한, 펌프를 통해 가압된 이산화탄소를 폐열을 이용해 가열함으로써, 초임계 상태의 이산화탄소를 이용하여 터빈을 구동하여 초임계 이산화탄소 발전할 수 있으므로, 가압 효율이 향상될 수 있다. In addition, by heating the carbon dioxide pressurized through the pump using waste heat, supercritical carbon dioxide power generation can be generated by driving the turbine using carbon dioxide in the supercritical state, so that the pressurization efficiency may be improved.

도 1은 본 발명의 실시예에 따른 이산화탄소 포집 및 저장을 위한 이산화탄소 가압 시스템을 개략적으로 도시한 도면이다.
도 2는 본 발명의 실시예에 따른 이산화탄소 가압시스템에서 이산화탄소의 P-H 선도이다.
도 3은 본 발명의 실시예에 따른 이산화탄소 가압시스템에서 터빈의 토출 압력과 효율을 나타낸 그래프이다. 1 is a diagram schematically showing a carbon dioxide pressurization system for capturing and storing carbon dioxide according to an embodiment of the present invention.
2 is a PH diagram of carbon dioxide in the carbon dioxide pressurization system according to an embodiment of the present invention.
3 is a graph showing the discharge pressure and efficiency of the turbine in the carbon dioxide pressurization system according to an embodiment of the present invention.

이하, 첨부된 도면을 참조하여 본 발명의 실시예에 대해 설명하면 다음과 같다. Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

도 1은 본 발명의 실시예에 따른 이산화탄소 포집 및 저장을 위한 이산화탄소 가압 시스템을 개략적으로 도시한 도면이다. 도 2는 본 발명의 실시예에 따른 이산화탄소 가압시스템에서 이산화탄소의 P-H 선도이다. 1 is a diagram schematically showing a carbon dioxide pressurization system for capturing and storing carbon dioxide according to an embodiment of the present invention. 2 is a P-H diagram of carbon dioxide in the carbon dioxide pressurization system according to an embodiment of the present invention.

도 1을 참조하면, 본 발명의 실시예에 따른 이산화탄소 포집 및 저장을 위한 이산화탄소 가압 시스템은, 이산화탄소 포집부(10)에서 포집된 이산화탄소를 이산화탄소 압축기(20), 증기 압축 냉동 사이클(30), 제1펌프(21), 초임계 이산화탄소 발전부(40) 및 제2펌프(22)를 차례로 통과시키면서 액화시키고 가압하는 시스템이다. Referring to FIG. 1, in the carbon dioxide pressurization system for collecting and storing carbon dioxide according to an embodiment of the present invention, a carbon dioxide compressor 20, a vapor compression refrigeration cycle 30, and a carbon dioxide collecting unit 10 collect carbon dioxide. It is a system that liquefies and pressurizes while passing the first pump 21, the supercritical carbon dioxide generator 40, and the second pump 22 in sequence.

상기 이산화탄소 포집부(10)는, 석탄 화력 발전소 등의 배기가스로부터 이산화탄소를 포집하는 장치이며, 공지된 다양한 방법을 이용하여 포집할 수 있다. The carbon dioxide collecting unit 10 is a device for collecting carbon dioxide from exhaust gas such as a coal-fired power plant, and may be collected using various known methods.

상기 이산화탄소 압축기(20)는, 상기 이산화탄소 포집부(10)와 연결되어, 상기 이산화탄소 포집부(10)에서 포집된 이산화탄소를 압축한다. 상기 이산화탄소 포집부(10)로부터 나온 이산화탄소의 압력은 약 1.8bar 이고, 상기 이산화탄소 압축기(20)는 약 70 bar 까지 압축한다. The carbon dioxide compressor 20 is connected to the carbon dioxide collecting unit 10 to compress the carbon dioxide collected by the carbon dioxide collecting unit 10. The pressure of carbon dioxide emitted from the carbon dioxide collecting unit 10 is about 1.8 bar, and the carbon dioxide compressor 20 compresses up to about 70 bar.

상기 증기 압축 냉동 사이클(30)은, 냉매 열교환기(31), 냉매 압축기(32), 냉매 응축기(33) 및 냉매 팽창장치(34)를 포함하고, 상기 냉매 열교환기(31), 상기 냉매 압축기(32), 상기 냉매 응축기(33) 및 상기 냉매 팽창장치(34)는 냉매가 순환하는 냉매 순환유로로 연결된다. The vapor compression refrigeration cycle 30 includes a refrigerant heat exchanger 31, a refrigerant compressor 32, a refrigerant condenser 33, and a refrigerant expansion device 34, and the refrigerant heat exchanger 31, the refrigerant compressor (32), the refrigerant condenser 33 and the refrigerant expansion device 34 are connected through a refrigerant circulation passage through which refrigerant circulates.

상기 냉매 열교환기(31)는, 상기 이산화탄소 압축기(20)와 연결되어, 상기 이산화탄소 압축기(20)에서 압축된 이산화탄소를 상기 냉매와 열교환시키는 열교환기이다. 상기 냉매 열교환기(31)는, 상기 이산화탄소와 상기 냉매를 열교환시켜, 상기 이산화탄소는 냉각하여 액화시키고, 상기 냉매는 가열하여 증발시키는 냉매 증발기이다. The refrigerant heat exchanger 31 is a heat exchanger connected to the carbon dioxide compressor 20 to exchange carbon dioxide compressed by the carbon dioxide compressor 20 with the refrigerant. The refrigerant heat exchanger 31 is a refrigerant evaporator that heats the carbon dioxide and the refrigerant to cool the carbon dioxide to liquefy, and heat the refrigerant to evaporate.

상기 냉매 압축기(32)는, 상기 냉매 열교환기에서 증발된 냉매를 압축한다.The refrigerant compressor 32 compresses the refrigerant evaporated in the refrigerant heat exchanger.

상기 냉매 응축기(33)는, 상기 냉매 압축기(32)에서 나온 냉매를 외부 열원과 열교환시켜 냉매를 응축시킨다. 여기서, 상기 외부 열원은 냉각수인 것으로 예를 들어 설명한다. 상기 냉매 응축기(33)에는 상기 냉각수가 흐르는 유로(53)가 연결된다.The refrigerant condenser 33 condenses the refrigerant by exchanging the refrigerant from the refrigerant compressor 32 with an external heat source. Here, the external heat source is described as an example as cooling water. A flow path 53 through which the cooling water flows is connected to the refrigerant condenser 33.

상기 냉매 팽창장치(34)는, 상기 냉매 응축기(33)에서 나온 냉매를 팽창시킨다. The refrigerant expansion device 34 expands the refrigerant discharged from the refrigerant condenser 33.

상기 제1펌프(21)는, 상기 냉매 열교환기(31)에서 나온 액체 상태의 이산화탄소를 펌핑하여, 상기 이산화탄소를 초임계 압력으로 가압한다. The first pump 21 pumps carbon dioxide in a liquid state from the refrigerant heat exchanger 31 to pressurize the carbon dioxide to a supercritical pressure.

도 2를 참조하면, 상기 제1펌프(21)에서 나온 이산화탄소(PD)의 압력은 약 220bar이다. Referring to FIG. 2, the pressure of carbon dioxide (P D ) from the first pump 21 is about 220 bar.

상기 제1펌프(21)에서 가압된 액체 상태의 이산화탄소는 상기 초임계 이산화탄소 발전부(40)로 유입된다.The liquid carbon dioxide pressurized by the first pump 21 flows into the supercritical carbon dioxide generator 40.

상기 초임계 이산화탄소 발전부(40)는, 폐열 열교환기(41), 터빈(42), 냉각 열교환기(43) 및 가열기(Regenerator)(44)를 포함한다. The supercritical carbon dioxide power generation unit 40 includes a waste heat heat exchanger 41, a turbine 42, a cooling heat exchanger 43, and a regenerator 44.

상기 폐열 열교환기(41)는, 상기 제1펌프(21)에서 가압된 액체 상태의 이산화탄소를 배기가스의 폐열을 이용하여 가열시킨다. 상기 폐열 열교환기(41)에서는 상기 이산화탄소와 상기 배기가스가 열교환된다. 상기 배기가스는, 상기 석탄 화력 발전소 등에서 배출되는 고온의 가스이다. 상기 폐열 열교환기(41)에는 배기가스 유로(51)가 연결된다.The waste heat heat exchanger 41 heats the liquid carbon dioxide pressurized by the first pump 21 by using waste heat of exhaust gas. In the waste heat heat exchanger 41, the carbon dioxide and the exhaust gas exchange heat. The exhaust gas is a high-temperature gas discharged from the coal-fired power plant or the like. An exhaust gas flow path 51 is connected to the waste heat heat exchanger 41.

상기 터빈(42)은, 상기 폐열 열교환기(41)에서 가열된 고온 고압의 이산화탄소에 의해 구동된다. The turbine 42 is driven by carbon dioxide of high temperature and high pressure heated in the waste heat heat exchanger 41.

상기 냉각 열교환기(43)는, 상기 터빈에서 나온 이산화탄소를 냉각하여 액화시킨다. 상기 냉각 열교환기(43)는 상기 이산화탄소와 냉각수를 열교환시키는 열교환기이다. 상기 냉각 열교환기(43)에는 상기 냉각수가 통과하는 냉각수 유로(52)가 연결된다.The cooling heat exchanger 43 cools and liquefies carbon dioxide emitted from the turbine. The cooling heat exchanger 43 is a heat exchanger for exchanging the carbon dioxide and cooling water. A cooling water flow path 52 through which the cooling water passes is connected to the cooling heat exchanger 43.

상기 가열기(44)는, 상기 제1펌프(21)의 토출구와 상기 폐열 열교환기(41)의 유입구를 연결하는 유로(46)와, 상기 터빈(42)의 토출구와 상기 냉각 열교환기(43)의 유입구를 연결하는 유로(45)사이에 구비된 열교환기이다. 상기 가열기(44)는, 상기 터빈(42)에서 나온 이산화탄소를 이용하여 상기 폐열 열교환기(41)로 유입되기 이전의 이산화탄소를 가열한다. The heater 44 includes a flow path 46 connecting an outlet of the first pump 21 and an inlet of the waste heat heat exchanger 41, and an outlet of the turbine 42 and the cooling heat exchanger 43 It is a heat exchanger provided between the flow path 45 connecting the inlet of. The heater 44 heats carbon dioxide before flowing into the waste heat heat exchanger 41 by using the carbon dioxide emitted from the turbine 42.

상기 제2펌프(22)는, 상기 초임계 이산화탄소 발전부(40)의 상기 냉각 열교환기(43)에서 나온 이산화탄소를 이산화탄소 수요처로 배출하기 위한 배출유로상에 설치된다. 상기 제2펌프(22)는, 상기 냉각 열교환기(43)에서 액화된 이산화탄소를 2차로 가압한다. 상기 제2펌프(22)에서 가압된 이산화탄소의 압력(Pout=PJ)은 약 150bar 수준이다. The second pump 22 is installed on a discharge channel for discharging the carbon dioxide from the cooling heat exchanger 43 of the supercritical carbon dioxide generator 40 to a carbon dioxide consumer. The second pump 22 secondarily pressurizes the carbon dioxide liquefied in the cooling heat exchanger 43. The pressure of carbon dioxide pressurized by the second pump 22 (Pout = P J ) is about 150 bar.

상기 이산화탄소 수요처는 상기 이산화탄소를 저장하는 이산화탄소 저장탱크(60)인 것으로 예를 들어 설명한다. 다만, 이에 한정되지 않고, 상기 이산화탄소 수요처는, 고압이고 액체 상태인 이산화탄소를 필요로 하는 것이라면 어느 것이나 가능하다.The carbon dioxide consumer is described as an example as a carbon dioxide storage tank 60 that stores the carbon dioxide. However, the present invention is not limited thereto, and any source of carbon dioxide demand may be used as long as it requires high pressure and liquid carbon dioxide.

상기와 같이 구성된 본 발명의 실시예에 따른 이산화탄소 가압 시스템의 작용을 설명하면, 다음과 같다.When explaining the operation of the carbon dioxide pressurization system according to an embodiment of the present invention configured as described above, as follows.

먼저, 상기 이산화탄소 압축기(20)는, 상기 이산화탄소 포집부(10)로부터 나온 기체 상태의 이산화탄소를 압축한다.First, the carbon dioxide compressor 20 compresses the gaseous carbon dioxide emitted from the carbon dioxide collecting unit 10.

상기 이산화탄소 포집부(10)로부터 나온 이산화탄소의 압력(Pin=PA)은 약 1.8bar 수준이다. The pressure (Pin=P A ) of carbon dioxide emitted from the carbon dioxide collecting unit 10 is about 1.8 bar.

상기 이산화탄소 압축기(20)에서 압축된 이산화탄소의 압력(PB)은 약 70 bar이다.The pressure (P B ) of carbon dioxide compressed by the carbon dioxide compressor 20 is about 70 bar.

상기 이산화탄소 압축기(20)에서 압축된 기체 상태의 이산화탄소는 상기 냉매 열교환기(31)로 유입된다.The gaseous carbon dioxide compressed by the carbon dioxide compressor 20 flows into the refrigerant heat exchanger 31.

상기 냉매 열교환기(31)에서 상기 기체 상태의 이산화탄소와 상기 냉매가 열교환되어, 상기 이산화탄소는 냉각되어 액체 상태가 된다. In the refrigerant heat exchanger 31, the gaseous carbon dioxide and the refrigerant are heat-exchanged, and the carbon dioxide is cooled to become a liquid state.

상기 제1펌프(21)는, 상기 냉매 열교환기(31)에서 나온 액체 상태의 이산화탄소를 초임계 압력까지 가압한다. 상기 냉매 열교환기(31)에서 이산화탄소가 액화되므로, 압축기 대신 펌프를 이용하여 가압할 수 있다. The first pump 21 pressurizes the liquid carbon dioxide discharged from the refrigerant heat exchanger 31 to a supercritical pressure. Since carbon dioxide is liquefied in the refrigerant heat exchanger 31, it can be pressurized using a pump instead of a compressor.

상기 제1펌프(21)에서 나온 이산화탄소의 압력(PD)은 약 220bar 수준이다. The pressure P D of carbon dioxide from the first pump 21 is about 220 bar.

상기 제1펌프(21)에서 가압된 이산화탄소는 상기 초임계 이산화탄소 발전부(40)를 통과하면서 가열되고, 상기 터빈(42)을 구동시켜 발전할 수 있다. The carbon dioxide pressurized by the first pump 21 is heated while passing through the supercritical carbon dioxide generator 40, and power may be generated by driving the turbine 42.

상기 터빈(42)을 구동시키고 나온 고온의 이산화탄소는 상기 가열기(44)를 통과하면서 상기 폐열 열교환기(41)로 유입되기 이전의 이산화탄소를 예열시킬 수 있다. The high-temperature carbon dioxide generated after driving the turbine 42 may pass through the heater 44 to preheat carbon dioxide before flowing into the waste heat heat exchanger 41.

상기 폐열 열교환기(41)에서 나온 이산화탄소는 상기 냉각 열교환기(43)를 통과하면서 냉각되어 액화된다.Carbon dioxide from the waste heat heat exchanger 41 is cooled and liquefied while passing through the cooling heat exchanger 43.

상기 냉각 열교환기(43)에서 나온 이산화탄소는 액체 상태이므로, 운반이 편리해질 수 있다.Since carbon dioxide emitted from the cooling heat exchanger 43 is in a liquid state, transportation may be convenient.

또한, 상기 냉각 열교환기(43)에서 나온 이산화탄소는 상기 제2펌프(22)에서 2차로 가압될 수 있다. In addition, carbon dioxide emitted from the cooling heat exchanger 43 may be secondarily pressurized by the second pump 22.

상기 제2펌프(22)는 상기 이산화탄소 수요처에서 원하는 압력까지 가압할 수 있다.The second pump 22 can pressurize the carbon dioxide consumer to a desired pressure.

상기와 같이, 본 발명에서는 기체 상태의 이산화탄소를 상기 증기 압축 냉동 사이클(30)을 이용해 냉각하여 액화시킴으로써, 상기 제1펌프(21)를 통해 가압할 수 있다.As described above, in the present invention, gaseous carbon dioxide may be cooled and liquefied using the vapor compression refrigeration cycle 30, thereby being pressurized through the first pump 21.

또한, 상기 제1펌프(21)에서 가압된 이산화탄소를 폐열을 이용하여 가열하여, 초임계 상태의 이산화탄소를 이용하여 상기 터빈(42)을 구동할 수 있다. In addition, by heating the carbon dioxide pressurized by the first pump 21 using waste heat, the turbine 42 may be driven using carbon dioxide in a supercritical state.

따라서, 상기 제1펌프(21)와 상기 제2펌프(22)를 이용해 이산화탄소를 가압하면서 초임계 이산화탄소 발전까지 가능한 이점이 있다. Therefore, there is an advantage that it is possible to generate supercritical carbon dioxide while pressurizing carbon dioxide using the first pump 21 and the second pump 22.

또한, 상기 냉각 열교환기(43)에서 상기 터빈(42)에서 나온 이산화탄소를 액화시킴으로써, 액체 상태의 이산화탄소를 상기 이산화탄소 수요처까지 운반하는 것이 보다 용이해질 수 있다. In addition, by liquefying the carbon dioxide from the turbine 42 in the cooling heat exchanger 43, it may be easier to transport the liquid carbon dioxide to the carbon dioxide consumer.

또한, 상기 이산화탄소 압축기(20)의 압축일을 최소화시킬 수 있으므로, 성능이 향상될 수 있다. In addition, since the compression work of the carbon dioxide compressor 20 can be minimized, performance can be improved.

도 3은 본 발명의 실시예에 따른 이산화탄소 가압시스템에서 터빈의 토출 압력과 효율을 나타낸 그래프이다. 3 is a graph showing the discharge pressure and efficiency of the turbine in the carbon dioxide pressurization system according to an embodiment of the present invention.

수학식 1은 상기 증기 압축 냉동 사이클(30)과 상기 초임계 이산화탄소 발전부(40)를 사용에 따른 순수 효율(Net effect)을 나타낸다. Equation 1 represents the net effect according to the use of the vapor compression refrigeration cycle 30 and the supercritical carbon dioxide generator 40.

[수학식 1][Equation 1]

Figure 112018127439751-pat00001
Figure 112018127439751-pat00001

여기서, W0는 종래기술에 따른 이산화탄소 압축기 필요한 순 동력이고, W1은 본 발명에 따른 이산화탄소 압축시 필요한 순 동력을 나타낸다. Here, W0 denotes the net power required for the carbon dioxide compressor according to the prior art, and W1 denotes the net power required when compressing the carbon dioxide according to the present invention.

도 3을 참조하면, 상기 터빈의 토출 압력에 따라 상기 순수 효율(Net effect)의 최적점이 존재한다는 것을 알 수 있다. 상기 터빈의 토출 압력을 저감시키면 발전량은 증가하지만, 최종 압축기의 압축일도 증가하기 때문에, 상기 순수 효율의 최적점이 존재한다. 따라서, 상기 순수 효율이 최대가 되도록 상기 터빈의 토출 압력을 제어할 수 있다.Referring to FIG. 3, it can be seen that the optimum point of the net effect exists according to the discharge pressure of the turbine. When the discharge pressure of the turbine is reduced, the amount of power generation increases, but the compression work of the final compressor also increases, so that the optimum point of pure water efficiency exists. Accordingly, it is possible to control the discharge pressure of the turbine so that the pure water efficiency is maximized.

본 발명은 도면에 도시된 실시예를 참고로 설명되었으나 이는 예시적인 것에 불과하며, 본 기술 분야의 통상의 지식을 가진 자라면 이로부터 다양한 변형 및 균등한 다른 실시예가 가능하다는 점을 이해할 것이다. 따라서, 본 발명의 진정한 기술적 보호 범위는 첨부된 특허청구범위의 기술적 사상에 의하여 정해져야 할 것이다.The present invention has been described with reference to the embodiments shown in the drawings, but these are merely exemplary, and those of ordinary skill in the art will appreciate that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical scope of the present invention should be determined by the technical spirit of the appended claims.

10: 이산화탄소 포집부 20: 이산화탄소 압축기
21: 제1펌프 22: 제2펌프
30: 증기 압축 냉동 사이클 31: 냉매 열교환기
32: 냉매 압축기 33: 냉매 응축기
34: 냉매 팽창장치 40: 초임계 이산화탄소 발전부
41: 폐열 열교환기 42: 터빈
43: 냉각 열교환기 44: 가열기10: carbon dioxide capture unit 20: carbon dioxide compressor
21: first pump 22: second pump
30: vapor compression refrigeration cycle 31: refrigerant heat exchanger
32: refrigerant compressor 33: refrigerant condenser
34: refrigerant expansion device 40: supercritical carbon dioxide power generation unit
41: waste heat heat exchanger 42: turbine
43: cooling heat exchanger 44: heater

Claims (9)

배기가스로부터 이산화탄소를 포집하는 이산화탄소 포집부와;
상기 이산화탄소 포집부와 연결되어, 상기 이산화탄소 포집부에서 포집된 기체 상태의 이산화탄소를 압축하는 이산화탄소 압축기와;
상기 이산화탄소 압축기와 연결되어, 상기 이산화탄소 압축기에서 압축된 이산화탄소를 냉매와 열교환시켜, 상기 이산화탄소를 냉각하여 액화시키는 냉매 열교환기와;
상기 냉매 열교환기와 연결되어, 상기 냉매 열교환기에서 나온 액체 상태의 이산화탄소를 펌핑하여, 상기 이산화탄소를 초임계 압력으로 가압하는 제1펌프와;
상기 제1펌프에서 가압된 이산화탄소를 폐열을 이용하여 가열시키는 폐열 열교환기와;
상기 폐열 열교환기에서 가열된 고온 고압의 이산화탄소에 의해 구동되는 터빈과;
상기 터빈에서 나온 이산화탄소를 냉각하여 액화시키는 냉각 열교환기와;
상기 냉각 열교환기에서 나온 고압이고 액체 상태의 이산화탄소를 이산화탄소 수요처로 배출하는 배출유로를 포함하고,
상기 배출유로에 구비되어, 상기 고압이고 액체 상태의 이산화탄소를 2차로 가압하는 제2펌프를 더 포함하고,
상기 이산화탄소 수요처는, 상기 배출유로에 연결되어 상기 제2펌프에서 2차로 가압된 이산화탄소를 저장하는 이산화탄소 저장탱크를 포함하고,
상기 제1펌프의 토출측과 상기 폐열 열교환기의 흡입측을 연결하는 유로와 상기 터빈의 토출측과 상기 냉각 열교환기의 흡입측을 연결하는 유로 사이에 구비되어, 상기 터빈에서 나온 이산화탄소를 이용하여 상기 폐열 열교환기로 유입되기 이전의 이산화탄소를 가열시키는 가열기를 더 포함하고,
상기 냉매 열교환기에서 상기 이산화탄소와 열교환되어 증발된 냉매를 압축하는 냉매 압축기와, 상기 냉매 압축기에서 나온 냉매를 외부 열원과 열교환시키는 냉매 응축기와, 상기 냉매 응축기에서 나온 냉매를 팽창시키는 냉매 팽창장치를 포함하는 증기 압축 냉동 사이클을 더 포함하고,
상기 냉각 열교환기는, 상기 이산화탄소를 냉각시키기기 위한 냉각수가 통과하는 냉각수 유로가 연결되고,
상기 폐열 열교환기는, 상기 이산화탄소를 가열시키기 위한 배기가스가 통과하는 배기가스 유로가 연결되고,
상기 터빈의 입구 온도가 설정 온도일 때, 상기 이산화탄소를 압축시 필요한 순 동력이 최소가 되는 상기 터빈의 토출 압력을 설정하는 이산화탄소 포집 및 저장을 위한 이산화탄소 가압 시스템. A carbon dioxide collecting unit for collecting carbon dioxide from exhaust gas;
A carbon dioxide compressor connected to the carbon dioxide collecting unit and compressing the gaseous carbon dioxide collected by the carbon dioxide collecting unit;
A refrigerant heat exchanger connected to the carbon dioxide compressor for exchanging carbon dioxide compressed by the carbon dioxide compressor with a refrigerant to cool and liquefy the carbon dioxide;
A first pump connected to the refrigerant heat exchanger to pump carbon dioxide in a liquid state from the refrigerant heat exchanger to pressurize the carbon dioxide to a supercritical pressure;
A waste heat heat exchanger for heating the carbon dioxide pressurized by the first pump using waste heat;
A turbine driven by high temperature and high pressure carbon dioxide heated in the waste heat heat exchanger;
A cooling heat exchanger for cooling and liquefying carbon dioxide from the turbine;
It includes a discharge passage for discharging high pressure and liquid carbon dioxide from the cooling heat exchanger to a carbon dioxide consumer,
Further comprising a second pump provided in the discharge passage for secondarily pressurizing the high-pressure and liquid carbon dioxide,
The carbon dioxide consumer includes a carbon dioxide storage tank connected to the discharge passage to store carbon dioxide secondarily pressurized by the second pump,
The waste heat is provided between a flow path connecting the discharge side of the first pump and the suction side of the waste heat heat exchanger and a flow path connecting the discharge side of the turbine and the suction side of the cooling heat exchanger, and uses carbon dioxide from the turbine. Further comprising a heater for heating the carbon dioxide before flowing into the heat exchanger,
A refrigerant compressor for compressing the refrigerant evaporated by heat exchange with the carbon dioxide in the refrigerant heat exchanger, a refrigerant condenser for exchanging heat exchange with the refrigerant from the refrigerant compressor with an external heat source, and a refrigerant expansion device for expanding the refrigerant from the refrigerant condenser Further comprising a vapor compression refrigeration cycle,
The cooling heat exchanger is connected to a cooling water flow path through which cooling water for cooling the carbon dioxide passes,
The waste heat heat exchanger is connected to an exhaust gas flow path through which exhaust gas for heating the carbon dioxide passes,
When the inlet temperature of the turbine is a set temperature, a carbon dioxide pressurization system for capturing and storing carbon dioxide sets a discharge pressure of the turbine at which the net power required for compressing the carbon dioxide is minimum. 삭제delete 삭제delete 삭제delete 삭제delete 삭제delete 삭제delete 삭제delete 삭제delete
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