The Design and Test of Ejectors for a 75-kW Fuel Cell System

75kW급 연료전지 시스템의 이젝터 설계 및 시험

  • Kim, Beom-Joo (Green Growth Laboratory, Korea Electric Power Research Institute, KEPCO) ;
  • Kim, Do-Hyeong (Green Growth Laboratory, Korea Electric Power Research Institute, KEPCO) ;
  • Lim, Hee-Chun (Green Growth Laboratory, Korea Electric Power Research Institute, KEPCO)
  • 김범주 (한국전력공사 전력연구원 녹색성장연구소) ;
  • 김도형 (한국전력공사 전력연구원 녹색성장연구소) ;
  • 임희천 (한국전력공사 전력연구원 녹색성장연구소)
  • Received : 2011.08.12
  • Accepted : 2011.10.21
  • Published : 2011.10.30


An Ejector enhances system efficiency, are easily operated, have a mechanically simple structure, and do not require a power supply. Because of these advantages, the ejector has been applied to a variety of industrial fields such as refrigerators, power plants and oil plants. In this work, an ejector was used to safely recycle anode tail gas in a 75-kW Molten Carbonate Fuel Cell (MCFC) system at KEPCO Research Institute. In this system, the ejector is placed at mixing point between the anode tail gas and the cathode tail gas or the fresh air. Commercial ejectors are not designed for the actual operating conditions for our fuel cell system. A new ejector was therefore designed for use beyond conventional operating limits. In the first place, a few sample ejectors were manufacured and the entrainment ratio was measured at a dummy stack. Through this experiment, the optimum ejector was chosen. The 75-kW MCFC system equipped with this optimum ejector was operated successfully.


Grant : 250kW급 열병합 용융탄산염 연료전지 Proto Type개발

Supported by : 한국에너지기술평가원(KETEP)


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