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

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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A CFD Analysis on Heat Transfer of High Temperature Steam through Interface with Superheater and SOEC for Hydrogen Production

SOEC에 과열기의 고온 스팀을 공급하는 Interface의 열전달에 관한 전산해석

  • BYUN, HYUN SEUNG (Department of Environment-Energy Engineering, The University of Suwon) ;
  • HAN, DANBEE (Department of Environment-Energy Engineering, The University of Suwon) ;
  • PARK, SEONGRYONG (Korea Institute of Energy Research) ;
  • CHO, CHONGPYO (Korea Institute of Energy Research) ;
  • BAEK, YOUNGSOON (Department of Environment-Energy Engineering, The University of Suwon)
  • 변현승 (수원대학교 환경에너지공학과) ;
  • 한단비 (수원대학교 환경에너지공학과) ;
  • 박성룡 (한국에너지기술연구원) ;
  • 조종표 (한국에너지기술연구원) ;
  • 백영순 (수원대학교 환경에너지공학과)
  • Received : 2020.04.08
  • Accepted : 2020.04.30
  • Published : 2020.04.30
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Abstract

There is a growing interest in hydrogen energy utilization since an alternative energy development has been demanded due to the depletion of fossil fuels. Hydrogen is produced by the reforming reaction of natural gas and biogas, and the electrolysis of water. An solid oxide electrolyte cell (SOEC) is reversible system that generates hydrogen by electrolyzing the superheated steam or producing the electricity from a fuel cell by hydrogen. If the water can be converted into steam by waste heat from other processes it is more efficient for high-temperature electrolysis to convert steam directly. The reasons are based upon the more favorable thermodynamic and electrochemical kinetic conditions for the reaction. In the present study, steam at over 180℃ and 3.4 bars generated from a boiler were converted into superheated steam at over 700℃ and 3 bars using a cylindrical steam superheater as well as the waste heat of the exhaust gas at 900℃ from a solid refuse fuel combustor. Superheated steam at over 700℃ was then supplied to a high-temperature SOEC to increase the hydrogen production efficiency of water electrolysis. Computational fluid dynamics (CFD) analysis was conducted on the effects of the number of 90° elbow connector for piping, insulation types and insulation layers of pipe on the exit temperature using a commercial Fluent simulator. For two pre-heater injection method of steam inlet and ceramic wool insulation of 100 mm thickness, the highest inlet temperature of SOEC was 744℃ at 5.9 bar.

Keywords

References

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