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Effect of operating parameters on a hybrid system of intermediate-temperature solid oxide fuel cell and gas turbine

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  • Lv, Xiaojing
  • Lu, Chaohao
  • Wang, Yuzhang
  • Weng, Yiwu

Abstract

In this work, detailed mathematical models of a hybrid system of an IT-SOFC (intermediate-temperature solid oxide fuel cell) and a GT (gas turbine) that is fueled by gasified biomass gas are built. Under the constraints of the working temperature of the fuel cell, mean axial temperature gradient, compressor surge, and turbine inlet temperature, the effects of operating parameters on the hybrid system are investigated mainly including RS (rotational speed), F/A (fuel/air) ratio, and S/C (steam/carbon) ratio. The electrical efficiency is 59.24% under the design condition. The power and efficiency of the system both decrease as the RS increases, with the latter decreasing from 60.95% to 49.08%. If the RS is too low, the system operation goes beyond the safety zone. In this situation, both the fuel cell and the turbine may be subjected to excess temperatures, and the compressor may easily surge. The efficiency increases from 56.5% to 61.34% with increasing F/A ratio, but an extremely high F/A ratio can cause the turbine to suffer from excess temperature. The efficiency decreases from 61.12% to 56.8% with increasing S/C ratio. The following two conclusions are drawn. First, the F/A ratio has the greatest influence on the performance of the hybrid system, i.e., its adjustment can effectively change the load in a wide range. Second, the RS and S/C ratio are suitable for load adjustment in a narrow range.

Suggested Citation

  • Lv, Xiaojing & Lu, Chaohao & Wang, Yuzhang & Weng, Yiwu, 2015. "Effect of operating parameters on a hybrid system of intermediate-temperature solid oxide fuel cell and gas turbine," Energy, Elsevier, vol. 91(C), pages 10-19.
    • Handle: RePEc:eee:energy:v:91:y:2015:i:c:p:10-19
    DOI: 10.1016/j.energy.2015.07.100
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    References listed on IDEAS

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    5. Park, Joonho & Lee, Yeageun & Chang, Ikwhang & Cho, Gu Young & Ji, Sanghoon & Lee, Wonyoung & Cha, Suk Won, 2016. "Atomic layer deposition of yttria-stabilized zirconia thin films for enhanced reactivity and stability of solid oxide fuel cells," Energy, Elsevier, vol. 116(P1), pages 170-176.
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    9. Ji, Zhixing & Qin, Jiang & Cheng, Kunlin & Guo, Fafu & Zhang, Silong & Dong, Peng, 2019. "Thermodynamics analysis of a turbojet engine integrated with a fuel cell and steam injection for high-speed flight," Energy, Elsevier, vol. 185(C), pages 190-201.
    10. Azizi, Mohammad Ali & Brouwer, Jacob, 2018. "Progress in solid oxide fuel cell-gas turbine hybrid power systems: System design and analysis, transient operation, controls and optimization," Applied Energy, Elsevier, vol. 215(C), pages 237-289.
    11. Choudhary, Tushar & Sanjay,, 2017. "Thermodynamic assessment of SOFC-ICGT hybrid cycle: Energy analysis and entropy generation minimization," Energy, Elsevier, vol. 134(C), pages 1013-1028.
    12. Kim, Ah-Reum & Shin, Seungho & Um, Sukkee, 2016. "Multidisciplinary approaches to metallic bipolar plate design with bypass flow fields through deformable gas diffusion media of polymer electrolyte fuel cells," Energy, Elsevier, vol. 106(C), pages 378-389.
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