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

  • 제31권1호
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  • Pages.33-40
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  • 2020
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  • 1738-7264(pISSN)
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  • 2288-7407(eISSN)
한국수소및신에너지학회 (The Korean Hydrogen and New Energy Society)
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수소액화공정에서 LNG 냉열 적용에 관한 시뮬레이션 연구

Simulation Study on the Application of LNG Cold Energy for Hydrogen Liquefaction Process

  • 한단비 (수원대학교 환경에너지공학과) ;
  • 변현승 (수원대학교 환경에너지공학과) ;
  • 백영순 (수원대학교 환경에너지공학과)
  • HAN, DANBEE (Department of Environment and Energy Engineering, The University of Suwon) ;
  • BYUN, HYUNSEUNG (Department of Environment and Energy Engineering, The University of Suwon) ;
  • BAEK, YOUNGSOON (Department of Environment and Energy Engineering, The University of Suwon)
  • 투고 : 2020.02.03
  • 심사 : 2020.02.28
  • 발행 : 2020.02.28
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초록

As hydrogen utilization becomes more active recently, a large amount of hydrogen should be supplied safely. Among the three supply methods, liquefied hydrogen, which is an optimal method of storage and transportation convenience and high safety, has a low temperature of -253℃, which is complicated by the liquefaction process and consumes a lot of electricity, resulting in high operating costs. In order to reduce the electrical energy required for liquefaction and to raise the efficiency, hydrogen is cooled by using a mixed refrigerant in a precooling step. The electricity required for the precooling process of the mixed refrigerant can be reduced by using the cold energy of LNG. Actually, LNG cold energy is used in refrigeration warehouse and air liquefaction separation process, and a lot of power reduction is achieved. The purpose of this study is to replace the electric power by using LNG cold energy instead of the electric air-cooler to lower the temperature of the hydrogen and refrigerant that are increased due to the compression in the hydrogen liquefaction process. The required energy was obtained by simulating mixed refrigerant (MR) hydrogen liquefaction system with LNG cold heat and electric system. In addition, the power replacement rate of the electric process were obtained with the pressure, the temperature of LNG, the rate of latent heat utilization, and the hydrogen liquefaction capacity, Therefore, optimization of the hydrogen liquefaction system using LNG cold energy was carried out.

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참고문헌

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