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

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Operation Characteristics According to Steam Temperature and Effectivenss of External Steam-Related SOEC System

외부 수증기 연계 SOEC 시스템의 공급 스팀 온도 및 열교환기 유용도에 따른 시스템 BOP 및 운전 특성 분석

  • KIM, YOUNG SANG (Department of Clean Fuel and Power Generation, Korea Institute of Machinery & Materials (KIMM)) ;
  • LEE, YOUNG DUK (Department of Clean Fuel and Power Generation, Korea Institute of Machinery & Materials (KIMM)) ;
  • AHN, KOOK YOUNG (Department of Clean Fuel and Power Generation, Korea Institute of Machinery & Materials (KIMM)) ;
  • LEE, DONG KEUN (Department of Clean Fuel and Power Generation, Korea Institute of Machinery & Materials (KIMM)) ;
  • LEE, SANG MIN (Department of Clean Fuel and Power Generation, Korea Institute of Machinery & Materials (KIMM)) ;
  • CHOI, EUN JUNG (Department of Clean Fuel and Power Generation, Korea Institute of Machinery & Materials (KIMM))
  • 김영상 (한국기계연구원 청정연료발전연구실) ;
  • 이영덕 (한국기계연구원 청정연료발전연구실) ;
  • 안국영 (한국기계연구원 청정연료발전연구실) ;
  • 이동근 (한국기계연구원 청정연료발전연구실) ;
  • 이상민 (한국기계연구원 청정연료발전연구실) ;
  • 최은정 (한국기계연구원 청정연료발전연구실)
  • Received : 2020.10.21
  • Accepted : 2020.12.30
  • Published : 2020.12.30
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Abstract

Solid oxide electrolysis cell (SOEC) attracts much attention because of its high energy efficiency among many water-electrolysis technologies. SOEC operates at temperatures above 700℃, so that the water required for water-electrolysis must be supplied in the form of steam. When the steam to be supplied to the SOEC is generated by the SOEC system itself, an enormous amount of latent heat is required to vaporize the water, so additional energy must be supplied to the SOEC system. On the other hand, if the steam can be supplied from the outside, a small amount of energy is required to raise the temperature of the low temperature steam, so that the SOEC system can be operated without additional energy supply from outside, which enables efficient water-electrolysis. In this study, we figure out the size of heat exchanger for various steam temperature and effectiveness of heat exchanger, and propose the energy efficiency of the system.

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References

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