Journal of the Korean Institute of Gas (한국가스학회지)

The Korean Institute of GAS (한국가스학회)
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Exergetic Analysis of Ammonia-fueled Solid Oxide Fuel Cell Systems for Power Generation

암모니아 활용 고체산화물 연료전지 발전시스템의 엑서지 분석

  • Thai-Quyen Quach (Department of Zero-carbon Fuel and Power Generation, Korea Institute of Machinery & Materials (KIMM)) ;
  • Young Gyun Bae (Department of Zero-carbon Fuel and Power Generation, Korea Institute of Machinery & Materials (KIMM)) ;
  • Kook Young Ahn (Department of Zero-carbon Fuel and Power Generation, Korea Institute of Machinery & Materials (KIMM)) ;
  • Sun Youp Lee (Department of Mobility Power Research, Korea Institute of Machinery & Materials (KIMM)) ;
  • Young Sang Kim (Department of Zero-carbon Fuel and Power Generation, Korea Institute of Machinery & Materials (KIMM))
  • 쿠엔 (한국기계연구원 무탄소연료발전연구실) ;
  • 배용균 (한국기계연구원 무탄소연료발전연구실) ;
  • 안국영 (한국기계연구원 무탄소연료발전연구실) ;
  • 이선엽 (한국기계연구원 그린동력연구실) ;
  • 김영상 (한국기계연구원 무탄소연료발전연구실)
  • Received : 2023.08.16
  • Accepted : 2023.09.24
  • Published : 2023.09.30
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Abstract

Using ammonia as fuel for solid oxide fuel (SOFC) cells has become an attractive topic nowadays due to its high efficiency, environmental friendliness, and ease of storage and transportation. Several configurations of ammonia-fed SOFC systems have been proposed and investigated, demonstrating high electrical efficiency. However, to further enhance efficiency, it is crucial to understand the inefficient components of the system. The exergy concept is well-suited for this purpose, making exergetic analysis essential for ammonia-fed SOFC systems. This study conducts an exergetic analysis for three selected systems: a simple fuel cell system (FC), an anode off-gas recirculation system (RC-FC), and a recirculation system with water removal (RC-WR-FC). The results reveal that the exergetic efficiencies of the FC, RC-FC, and RC-WR-FC are 48.7%, 51.6%, and 58.4%, respectively. In all three systems, the SOFC stack is the main source of exergy destruction. However, other components with relatively low exergetic efficiency, such as the burner, air heat exchanger, and cooler/condenser, offer greater opportunities for improvement.

고체 산화물 연료전지의 연료로 암모니아를 사용하는 것은 고효율, 환경 친화성, 보관 및 운송의 용이성으로 인해 주목받고 있다. 암모니아 활용 SOFC 시스템의 효율을 더욱 높이려면 시스템의 비효율적인 구성 요소를 이해해야 하며 이를 위해 엑서지 분석을 수행하였다.본 연구에서는 단순 연료전지 시스템(FC), 연료극 재순환 시스템(RC-FC) 및 수분 제거 재순환 시스템(RC-WR-FC)의 세 가지 시스템에 대해 엑서지 분석을 수행하였다. FC, RC-FC 및 RC-WR-FC의 엑서지 효율은 각각 48.7%, 51.6% 및 58.4%이었으며, 세 시스템 모두에서 SOFC 스택은 엑서지 파괴의 주요 원인이었다. 또한 버너, 공기 열 교환기 및 냉각기/응축기와 같이 낮은 효율을 가진 부품들을 재구성한다면 효율을 높일 수 있다.

Keywords

Acknowledgement

본 연구는 산업통상자원부(MOTIE)와 한국에너지기술평가원(KETEP)의 지원을 받아 수행되었으며(No. 20213030040110), 한국기계연구원 기관 기본사업(Project ID: NK237G)의 지원을 받아 수행된 결과다.

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