Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Effect of the Molar H2O/ and the Molar O2/C Ratio on Long-Term Performance of Diesel Autothermal Reformer for Solid Oxide Fuel Cell

고체산화물 연료전지용 디젤 자열개질기의 장기성능에 미치는 H2O/C와 O2/C 몰 비의 영향

  • Yoon, Sang-Ho (New Energy Conversion System Lab., Korea Advanced Institute of Science and Technology (KAIST), Department of Mechanical Engineering) ;
  • Kang, In-Yong (New Energy Conversion System Lab., Korea Advanced Institute of Science and Technology (KAIST), Department of Mechanical Engineering) ;
  • Bae, Gyu-Jong (New Energy Conversion System Lab., Korea Advanced Institute of Science and Technology (KAIST), Department of Mechanical Engineering) ;
  • Bae, Joong-Myeon (New Energy Conversion System Lab., Korea Advanced Institute of Science and Technology (KAIST), Department of Mechanical Engineering)
  • 윤상호 (한국과학기술원 기계공학과) ;
  • 강인용 (한국과학기술원 기계공학과) ;
  • 배규종 (한국과학기술원 기계공학과) ;
  • 배중면 (한국과학기술원 기계공학과)
  • Published : 2007.05.28
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Abstract

Solid oxide fuel cell(SOFC) has high fuel flexibility due to its high operating temperatures. Hydrocarbonaceous fuels such as diesel has several advantages such as high energy density and established infrastructure for fuel cell applications. However diesel reforming has technical problems like coke formation in a reactor, which results in catastrophic failure of whole system. Performance degradation of diesel autothermal reforming (ATR) leads to increase of undesirable hydrocarbons at reformed gases and subsequently degrades SOFC performance. In this study, we investigate the degradation of SOFC performance(OCV, open circuit voltage) under hydrocarbon(n-Butane) feeds and characteristics of diesel performing under various ratios of reactants($H_2O/C,\;O_2/C$ molar ratios) for improvement of SOFC performance. Especially we achieved relatively high performance of diesel ATR under $H_2O/C=0.8,\;O_2/C=3$ condition.

고온형 연료전지인 고체산화물 연료전지(solid oxide fuel cell, SOFC)는 연료에 대한 유연성(fuel flexibility)이 높다. 따라서 높은 에너지 밀도를 가진 디젤을 개질하여 SOFC를 운전하는 것은 효과적인 방법이다. 하지만 디젤이 가지는 특성으로 인해 디젤 자열개질기(autothermal refromer)는 운전 시간에 따라 탄소 침적(carbon deposition) 현상이 발생하여 개질기의 성능이 쉽게 저감된다. 개질기 성능 저감 현상 때문에 개질 가스들 중에 탄화수소 생성량이 많아지며, 이는 SOFC 성능도 저감시킨다. 이러한 현상은 연료극에 공급되는 탄화수소가 야기하는 탄소 침적으로 사료된다. 본 연구에서는 탄화수소가 SOFC에 주는 성능 저감을 확인하였으며, 연료전지 성능 저감을 줄이기 위한 디젤 자열개질기 반응물들의 조건 선정($H_2O/C$와 $O_2/C$의 몰 비)을 통해 디젤 자열 개질기 특성을 살펴보았다. 특히 $H_2O/C=0.8$과 $O_2/C=3$인 디젤 자열개질 반응 조건에서 좋은 개질 성능을 확인할 수 있었다.

Keywords

References

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