The application of energy supply systems based on fuel cells contributes to meeting the requirement of sustainable development, and developing high-efficiency, low-pollution, and multifunction poly-generation systems coupled with fuel cells is increasingly attractive. This study proposes a novel combined cooling, heating, power poly-generation and dehumidification system including a solid oxide fuel cell, a gas turbine, a double effect absorption refrigerator, a condensation dehumidification unit, an organic Rankine cycle, and a heat exchanger. Thermodynamic, economic, and environmental analysis models of the entire system are developed to evaluate system comprehensive performance. The effects of system parameters such as the inlet temperature of fuel cell, steam to carbon ratio, air flow rate, and high temperature generator temperature on system performance are analyzed. The analysis findings reveal that the proposed system can provide power, cooling, and heating of 551.904 kW, 20.307 kW, and 193.009 kW, and the dehumidification capacity per unit is 14.516 g/kg when 1.238 kg/s of humid air is treated. The system exergy efficiency is found to be 70.534 %, and the system cost rate is 15.578 $/h with carbon dioxide emission being 0.301 kg/kWh at the design condition. Two groups of multi-objective optimizations of the whole system are further conducted to acquire the optimal system performance and working conditions. The optimization results demonstrate that the optimal exergy efficiency of 72.912 % appears at point C1 in the first group of optimization with the lowest carbon dioxide emission being 0.293 kg/kWh, and the optimal qualities of humid air are found to be 1.606 kg/s at C2 and D2 in the second group of optimization. After optimization, the system carbon dioxide emission is decreased by 0.008 kg/kWh, the exergy efficiency is increased by 2.378 %, and the quality of humid air in dehumidification process is developed by 0.368 kg/s. In summary, the proposed poly-generation and dehumidification system can meet multifunction energy demands and achieve good performance, and the research work could also provide theoretical basis for developing evaluation and optimization technologies of fuel cell-based poly-generation systems.

中文翻译：

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基于新型固体氧化物燃料电池的多联产冷凝除湿系统的性能分析和多目标优化


以燃料电池为基础的能源供应系统的应用有助于满足可持续发展的要求，开发与燃料电池相结合的高效、低污染、多功能的多联产系统越来越有吸引力。本研究提出了一种新型的冷却、加热、电力多联产和除湿系统，包括固体氧化物燃料电池、燃气轮机、双效吸收式制冷机、冷凝除湿装置、有机朗肯循环和热交换器。建立了整个系统的热力学、经济和环境分析模型，以评估系统的综合性能。分析了燃料电池入口温度、汽炭比、空气流量、高温发生器温度等系统参数对系统性能的影响。分析结果表明，该系统可提供551.904 kW、20.307 kW和193.009 kW的电力、冷却和加热，在处理1.238 kg/s的湿空气时，单位除湿量为14.516 g/kg。在设计工况下，系统火用效率为70.534%，系统成本率为15.578 $/h，二氧化碳排放量为0.301 kg/kWh。进一步对整个系统进行两组多目标优化，以获得最优的系统性能和工况。优化结果表明，第一组优化中C1点的最佳火用效率为72.912%，二氧化碳排放量最低为0.293 kg/kWh，湿空气最佳质量为1.606 kg/s。第二组优化中的C2和D2。 优化后，系统二氧化碳排放量减少0.008 kg/kWh，火用效率提高2.378%，除湿过程湿空气质量提高0.368 kg/s。综上所述，所提出的多联产除湿系统能够满足多功能能源需求并取得良好的性能，研究工作也可为开发基于燃料电池的多联产系统的评估和优化技术提供理论依据。