Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Comparative Research on the Carbon Dioxide Liquefaction Using Several Refrigerants

몇 가지 냉매를 사용한 이산화탄소 액화에 대한 비교 연구

  • ILSU PARK (Department of Chemical Engineering) ;
  • PHILSUNG HWANG (Technology Research Center, Hyundai Engineering & Construction) ;
  • KICHEOL JUNG (Technology Research Center, Hyundai Engineering & Construction) ;
  • JUNESHU ANH (Department of Energy and Environmental Engineering) ;
  • JUNGHO CHO (Department of Chemical Engineering)
  • 박일수 (국립공주대학교 공과대학 화학공학부) ;
  • 황필성 (현대건설 기술연구원) ;
  • 정기철 (현대건설 기술연구원) ;
  • 안준수 (대진대학교 스마트건설.환경공학부) ;
  • 조정호 (국립공주대학교 공과대학 화학공학부)
  • Received : 2023.04.14
  • Accepted : 2023.04.21
  • Published : 2023.04.28
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Abstract

In this study, we compared the performance of several refrigeration cycles using different refrigerants and utilizing the cold heat of liquefied natural gas (LNG) for the liquefaction of carbon dioxide. The final conditions for the liquefied CO2 were set to -20℃ and 20 bar. The refrigerants used included R404a, ammonia, propane, and propylene using a vapor recompression refrigeration cycle. For the refrigeration cycle, the CO2 at room temperature and pressure was compressed in a two-stage compression process with an intermediate cooling stage using a refrigeration unit. To compare with the liquefaction process using refrigeration, we compressed the CO2 to 8 bar in a single compression stage and cooled it to around -50℃ using the cold heat of the LNG before liquefying it. Results showed that using ammonia as the refrigerant required the least amount of compressor power for the liquefaction process, and the heat transfer area of the evaporator was the smallest when using propylene as the refrigerant. Using the cold heat of LNG instead of refrigeration using R404a resulted in approximately 69% less energy consumption.

Keywords

Acknowledgement

본 연구는 2023년도 정부(과학기술정보통신부)의 재원으로 한국연구재단-CCU3050 사업의 지원을 받아 수행된 연구임(No.2022M3J2A1063788).

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