Abstract The substantial use of fossil fuels in marine transportation aggravates the problems of energy shortage and environmental pollution. The application of fuel cell and waste heat recovery technology in ships can effectively address this severe global issue. In this study, a novel combined system comprising a solid oxide fuel cell–gas turbine subsystem, supercritical-carbon dioxide recompression cycle, and Kalina cycle is introduced and analyzed. First, the feasibility of each model is verified by comparing the subsystems with results in the literature. Subsequently, zeotropic working fluids are used in the supercritical-carbon dioxide recompression cycle. Then, the optimum composition and ratio of working fluids in the bottoming cycles are determined by simulation. Finally, the thermodynamic and economic properties are simulated and analyzed. The results illustrate that the actual power output and thermal efficiency of this combined system can reach 286.41 kW and 71.37%, respectively. The latter is 38.65% higher than the efficiency of a solid oxide fuel cell. In addition, the maximum cost recovery time of the waste heat recovery system is 7.492 year, which completely satisfies the economic requirements. To summarize, the proposed novel system design exhibits characteristics of high efficiency and cleanliness and is a better option for marine power generation equipment.

中文翻译：

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从大型船用固体氧化物燃料电池收集废热的集成解决方案

摘要 化石燃料在海洋运输中的大量使用，加剧了能源短缺和环境污染问题。燃料电池和余热回收技术在船舶上的应用，可以有效解决这一严峻的全球性问题。本研究介绍并分析了一种新型组合系统，包括固体氧化物燃料电池-燃气轮机子系统、超临界二氧化碳再压缩循环和 Kalina 循环。首先，通过将子系统与文献中的结果进行比较来验证每个模型的可行性。随后，共沸工作流体用于超临界二氧化碳再压缩循环。然后，通过模拟确定底循环中工作流体的最佳组成和比例。最后，对热力学和经济特性进行了模拟和分析。结果表明，该组合系统的实际功率输出和热效率分别可以达到286.41 kW和71.37%。后者比固体氧化物燃料电池的效率高 38.65%。此外，余热回收系统的最大成本回收时间为7.492年，完全满足经济要求。总而言之，所提出的新型系统设计具有高效和清洁的特点，是船用发电设备的更好选择。余热回收系统最大成本回收时间为7.492年，完全满足经济要求。总而言之，所提出的新型系统设计具有高效和清洁的特点，是船用发电设备的更好选择。余热回收系统最大成本回收时间为7.492年，完全满足经济要求。总而言之，所提出的新型系统设计具有高效和清洁的特点，是船用发电设备的更好选择。