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A Dynamic Analysis of the Multi-Stack SOFC-CHP System for Power Modulation

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  • Cheng-Hao Yang

    (Hydrogen & Fuel Cell Project, Green Energy & Environment Research Laboratories, Industrial Technology Research Institute, 7F, No.301, Gaofa 3rd Rd., Guiren Dist., Tainan 71150, Taiwan)

  • Shing-Cheng Chang

    (Hydrogen & Fuel Cell Project, Green Energy & Environment Research Laboratories, Industrial Technology Research Institute, 7F, No.301, Gaofa 3rd Rd., Guiren Dist., Tainan 71150, Taiwan)

  • Yen-Hsin Chan

    (Hydrogen & Fuel Cell Project, Green Energy & Environment Research Laboratories, Industrial Technology Research Institute, 7F, No.301, Gaofa 3rd Rd., Guiren Dist., Tainan 71150, Taiwan)

  • Wen-Sheng Chang

    (Hydrogen & Fuel Cell Project, Green Energy & Environment Research Laboratories, Industrial Technology Research Institute, 7F, No.301, Gaofa 3rd Rd., Guiren Dist., Tainan 71150, Taiwan)

Abstract

This paper performs a dynamic analysis of a 10-kW solid oxide fuel cell/combined heat and power (SOFC-CHP) system with a multi-stack module via numerical simulations. The performance of stacks, tail gas burners, heat exchangers, and fuel reformers are modeled by the MATLAB/Simulink module. The effects of fuel and air maldistribution on SOFC-CHP systems are addressed in this work. A two-stack module for 10-kW power generation is adopted to represent the multi-stack module with high power modulation. The air flow rate and operating current, which are related to the fuel use rate of an SOFC system, should be optimally regulated to perform with maximum power generation and efficiency. The proposed dynamic analysis shows that the operating temperatures of the two stacks have a difference of 33 K, which results in a reduced total power generation of 9.77 kW, with inconsistent fuel use (FU) rates of 78.3% and 56.8% for the two stacks. With the optimal control strategy, the output power is increased to 10.6 kW, an increment of 8.5%, and the FU rates of the two stacks are improved to 79% and 70%, respectively. As a potential distributed power generator, the long-term effects of the studied SOFC-CHP systems are also investigated. The dynamic analysis of the long-term operating SOFC-CHP system shows that the total daily output power can be increased 7.34% by using the optimal control strategy.

Suggested Citation

  • Cheng-Hao Yang & Shing-Cheng Chang & Yen-Hsin Chan & Wen-Sheng Chang, 2019. "A Dynamic Analysis of the Multi-Stack SOFC-CHP System for Power Modulation," Energies, MDPI, vol. 12(19), pages 1-17, September.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:19:p:3686-:d:271093
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    References listed on IDEAS

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    1. Barelli, L. & Bidini, G. & Ottaviano, A., 2016. "Solid oxide fuel cell modelling: Electrochemical performance and thermal management during load-following operation," Energy, Elsevier, vol. 115(P1), pages 107-119.
    2. Ferrari, Mario L., 2015. "Advanced control approach for hybrid systems based on solid oxide fuel cells," Applied Energy, Elsevier, vol. 145(C), pages 364-373.
    3. Paulina Pianko-Oprych & S. M. Hosseini, 2017. "Dynamic Analysis of Load Operations of Two-Stage SOFC Stacks Power Generation System," Energies, MDPI, vol. 10(12), pages 1-21, December.
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    Cited by:

    1. Marcin Wołowicz & Piotr Kolasiński & Krzysztof Badyda, 2021. "Modern Small and Microcogeneration Systems—A Review," Energies, MDPI, vol. 14(3), pages 1-47, February.
    2. Chien-Chang Wu & Tsung-Lin Chen, 2020. "Design and Experiment of a Power Sharing Control Circuit for Parallel Fuel Cell Modules," Energies, MDPI, vol. 13(11), pages 1-23, June.
    3. Chung-Jen Chou & Shyh-Biau Jiang & Tse-Liang Yeh & Li-Duan Tsai & Ku-Yen Kang & Ching-Jung Liu, 2020. "A Portable Direct Methanol Fuel Cell Power Station for Long-Term Internet of Things Applications," Energies, MDPI, vol. 13(14), pages 1-13, July.
    4. Chien-Chang Wu & Tsung-Lin Chen, 2020. "Dynamic Modeling of a Parallel-Connected Solid Oxide Fuel Cell Stack System," Energies, MDPI, vol. 13(2), pages 1-20, January.

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