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5E analysis and optimization of marine parallel SOFC-engine-WHR integrated systems supplied with different low carbon fuel combinations

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  • Ma, Yue
  • Yang, Chen
  • Wang, Zhe
  • Yang, Jinguang

Abstract

A parallel SOFC -Engine -WHR integrated system for Marine supply of three low carbon fuels is proposed. Natural gas solid oxide fuel cells (SOFC), methanol SOFC and ammonia SOFC are integrated with natural gas internal combustion engines (ICE) respectively. Heat recovery steam generators and supercritical carbon dioxide (SCO2) power cycles recover SOFC waste heat and ICE waste heat. The performance differences of the three systems in energy, exergy, exergoeconomic, environment and ship energy efficiency design index under the same condition are compared and analyzed. The results found the SOFC(NH3)-ICE(CH4)-WHR integrated system has the highest energy efficiency (56.11 %) and exergy efficiency (43.41 %) and best environmental performance. At the same time, in the comparison of ship cases, the ship using system 3 has the lowest ship energy efficiency index (4.60), which shows that system 3 has the lowest energy consumption and the highest efficiency. Exergy destruction of SOFC, afterburner and combustion chamber (ICE) accounted for the largest proportion, and the thermodynamic performance of these three components needs to be improved. According to the comparison results, the shortcomings of three different fuel combination systems were determined, and the performance was optimized by genetic algorithm. The optimized SOFC(NH3)-HRSG-ICE(CH4)-SCO2 integrated system achieves a 3.71 % increase in exergy efficiency and a 4.48 % improvement in energy efficiency.

Suggested Citation

  • Ma, Yue & Yang, Chen & Wang, Zhe & Yang, Jinguang, 2025. "5E analysis and optimization of marine parallel SOFC-engine-WHR integrated systems supplied with different low carbon fuel combinations," Energy, Elsevier, vol. 332(C).
    • Handle: RePEc:eee:energy:v:332:y:2025:i:c:s0360544225026489
    DOI: 10.1016/j.energy.2025.137006
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