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Effect of different operating strategies for a SOFC-GT hybrid system equipped with anode and cathode ejectors

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  • Chen, Jinwei
  • Chen, Yao
  • Zhang, Huisheng
  • Weng, Shilie

Abstract

Ejector technology is introduced to perform the anode and cathode recirculation loops with low maintenance costs and high reliability. Four different operating strategies were designed for the novel solid oxide fuel cell-gas turbine hybrid system with anode and cathode ejectors to keep high efficiency and safety at a part-load operating condition. The part-load characteristics under different operating strategies were compared according to the simulation results. The comparison results show that the operating strategy has great effect on the part-load performance of the hybrid system with anode and cathode ejectors. Maintaining the SOFC operating temperature with variable speed operation has a great significance on the system efficiency. Moreover, fuel utilization, turbine inlet temperature, fuel cell temperature should be controlled and monitored to guarantee safely operating. Specifically, a concept of monitoring the temperature difference between anode and cathode channel is proposed. It can effectively avoid huge fuel cell temperature differences and compressor surge. Therefore, case 4 is an effective and appropriate operating strategy, which adjusts the primary fuel flow rate of SOFC, rotational speed, assistant fuel flow rate, compressor/turbine bypass flow rate to maintain turbine inlet temperature and temperature differences between anode and cathode.

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  • Chen, Jinwei & Chen, Yao & Zhang, Huisheng & Weng, Shilie, 2018. "Effect of different operating strategies for a SOFC-GT hybrid system equipped with anode and cathode ejectors," Energy, Elsevier, vol. 163(C), pages 1-14.
    • Handle: RePEc:eee:energy:v:163:y:2018:i:c:p:1-14
    DOI: 10.1016/j.energy.2018.08.032
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    2. Cheng, Tianliang & Jiang, Jianhua & Wu, Xiaodong & Li, Xi & Xu, Mengxue & Deng, Zhonghua & Li, Jian, 2019. "Application oriented multiple-objective optimization, analysis and comparison of solid oxide fuel cell systems with different configurations," Applied Energy, Elsevier, vol. 235(C), pages 914-929.
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    5. Chen, Jinwei & Hu, Zhenchao & Lu, Jinzhi & Zhang, Huisheng & Weng, Shilie, 2022. "A novel control strategy with an anode variable geometry ejector for a SOFC-GT hybrid system," Energy, Elsevier, vol. 261(PA).
    6. Besagni, Giorgio, 2019. "Ejectors on the cutting edge: The past, the present and the perspective," Energy, Elsevier, vol. 170(C), pages 998-1003.
    7. Ji, Zhixing & Qin, Jiang & Cheng, Kunlin & Guo, Fafu & Zhang, Silong & Zhou, Chaoying & Dong, Peng, 2020. "Determination of the safe operation zone for a turbine-less and solid oxide fuel cell hybrid electric jet engine on unmanned aerial vehicles," Energy, Elsevier, vol. 202(C).
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