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Thermodynamic performance analysis of direct methanol solid oxide fuel cell hybrid power system for ship application

Author

Listed:
  • Li, Chengjie
  • Wang, Jingyi
  • Liu, He
  • Guo, Fafu
  • Xiu, Xinyan
  • Wang, Cong
  • Qin, Jiang
  • Wei, Liqiu

Abstract

Methanol is a fuel that can be directly supplied to solid oxide fuel cell (SOFC) without carbon deposition. This paper introduces the direct methanol SOFC-Internal combustion engine (ICE) hybrid power and SOFC-Gas turbine (GT) hybrid power systems. Thermodynamic performance analysis of the hybrid power systems and an investigation into the impact of various parameters were conducted. The results indicate that the electric efficiency of the SOFC-ICE system is 56.07 %, which is 3 percentage points higher than the SOFC-GT system but 3–4 percentage points lower than the SOFC-ICE system with pre-reforming. Increasing fuel utilization rate, operation temperature, and excess air ratio is beneficial to the performance of the SOFC, and raising current density helps improve the system's power density. Load-sharing strategy research demonstrates that in a scenario where the power ratio between SOFC and the ICE is 35:65, compared to a methanol engine, the efficiency of the SOFC-ICE hybrid power system increases by 4.3 %. Despite a 1.4-fold increase in weight and a 1.66-fold increase in cost, the fuel consumption rate and carbon emissions decrease by 8.8 %. Therefore, the strategy of combining a high-power engine with a low-power SOFC is currently a suitable load-sharing strategy for ship applications.

Suggested Citation

  • Li, Chengjie & Wang, Jingyi & Liu, He & Guo, Fafu & Xiu, Xinyan & Wang, Cong & Qin, Jiang & Wei, Liqiu, 2024. "Thermodynamic performance analysis of direct methanol solid oxide fuel cell hybrid power system for ship application," Renewable Energy, Elsevier, vol. 230(C).
    • Handle: RePEc:eee:renene:v:230:y:2024:i:c:s0960148124008772
    DOI: 10.1016/j.renene.2024.120809
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