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

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Performance Evaluation and Optimization of Hydrogen Liquefaction Process Using the Liquid Air for Pre-Cooling

액화공기(Liquid Air) 예냉기반 수소액화공정 성능 해석 및 최적화

  • PARK, SUNGHO (Plant Engineering Center, Institute for Advanced Engineering) ;
  • AHN, JUNKEON (Plant Engineering Center, Institute for Advanced Engineering) ;
  • RYU, JUYEOL (Plant Engineering Center, Institute for Advanced Engineering) ;
  • KO, AREUM (Plant Engineering Center, Institute for Advanced Engineering)
  • 박성호 (고등기술연구원 플렌트 엔지니어링센터 에너지환경연구팀) ;
  • 안준건 (고등기술연구원 플렌트 엔지니어링센터 에너지환경연구팀) ;
  • 류주열 (고등기술연구원 플렌트 엔지니어링센터 에너지환경연구팀) ;
  • 고아름 (고등기술연구원 플렌트 엔지니어링센터 에너지환경연구팀)
  • Received : 2019.09.25
  • Accepted : 2019.12.30
  • Published : 2019.12.30
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Abstract

The intermittent electric power supply of renewable energy can have extremely negative effect on power grid, so long-term and large-scale storage for energy released from renewable energy source is required for ensuring a stable supply of electric power. Power to gas which can convert and store the surplus electric power as hydrogen through water electrolysis is being actively studied in response to increasing supply of renewable energy. In this paper, we proposed the novel concept of hydrogen liquefaction process combined with pre-cooling process using the liquid air. It is that hydrogen converted from surplus electric power of renewable energy was liquefied through the hydrogen liquefaction process and vaporization heat of liquid hydrogen was conversely recovered to liquid air from ambient air. Moreover, Comparisons of specific energy consumption (kWh/kg) saved for using the liquid air pre-cooling was quantitatively conducted through the performance analysis. Consequently, about 12% of specific energy consumption of hydrogen liquefaction process was reduced with introducing liquid air for pre-cooling and optimal design point of helium Brayton cycle was identified by sensitivity analysis on change of compression/expansion ratio.

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