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Hybrid power system integrating supercritical CO2 Brayton cycle for solid oxide fuel cell waste heat recovery: Multi-objective optimization and dynamic performance assessment

Author

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  • Wang, Di
  • Zhang, Bin
  • Fan, Changhao
  • Sun, Yan
  • Li, Xiaoli

Abstract

To enhance the energy utilization efficiency of solid oxide fuel cell, a novel integrated system which utilizes a supercritical CO2 Brayton cycle as the bottom cycle to absorb the solid oxide fuel cell waste is proposed. A dynamic model of the integrated system is developed. With the objective of the minimizing levelized cost of electricity and maximizing power generation efficiency, the integrated system parameters are optimized. Using the optimized results as the steady-state design point for the integrated system, disturbance simulation experiments are conducted by varying the inlet flow rate and current. A comprehensive analysis method for exploring the effects of key parameter disturbance on the dynamic performance of key components and the integrated system is carried out. Results shows that the net power generation efficiency and the levelized cost of electricity of the integrated system are 63.59% and 0.0653 $/kWh respectively. The integrated system has a fast response speed, with the response time being approximately 20s. The findings of this study provide a theoretical foundation for designing the control structures of SOFC integrated systems.

Suggested Citation

  • Wang, Di & Zhang, Bin & Fan, Changhao & Sun, Yan & Li, Xiaoli, 2026. "Hybrid power system integrating supercritical CO2 Brayton cycle for solid oxide fuel cell waste heat recovery: Multi-objective optimization and dynamic performance assessment," Energy, Elsevier, vol. 360(C).
    • Handle: RePEc:eee:energy:v:360:y:2026:i:c:s036054422601546x
    DOI: 10.1016/j.energy.2026.141440
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