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Optimal design of molten carbonate fuel cell combined cycle power plant and thermophotovoltaic system

机译：熔融碳酸盐燃料电池联合循环发电厂与蒸镀系统的最佳设计

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摘要

A novel hybrid system consisting of a molten carbonate fuel cell (MCFC), a gas turbine (GT), a steam cycle and a thermophotovoltaic (TPV) system to generate power is introduced and investigated. For this purpose, a GT is coupled to a MCFC in order to utilize unused fuel, raise the gas components temperature, supply the required carbon dioxide, and further power generation. Moreover, in order to boost the power generation and ameliorate the overall efficiency, a TPV system together with a steam cycle has been added to the system for heat recovery from the combustion chamber radiation and cathode output stream, respectively. The simulation of the hybrid system was accomplished through ASPEN HYSYS and MATLAB software. The effect of different influential parameters on each sub-system as well as the proposed hybrid system was examined comprehensively through sensitivity analysis. The results obtained revealed that increasing MCFC temperature decreased the anode, cathode, and ohmic overpotentials, while augmented the output voltage of the MCFC led to enhanced MCFC performance. Furthermore, the output voltage, power density, and efficiency of the MCFC enhanced with increasing the operating pressure for both of the fuel consumption rates. The output voltage and power density of the MCFC decreased as the fuel consumption rate incremented due to increased polarization losses, while the electrical efficiency of the MCFC enhanced. Optimizing the output temperature of the first and second heat exchangers increased the power of the steam turbine by about 16 kW. The highest power density and performance of the TPV system was obtained at cell and emitter distance of 1 cm. Incorporating the GT to the MCFC enhanced the system's efficiency to 54.83%. The efficiency of the proposed hybrid system was found to be 67.3%.
机译：引入并研究了由熔融的碳酸盐燃料电池（MCFC），燃气轮机（GT），蒸汽循环和蒸汽体（TPV）系统组成的新型混合系统，以产生电力。为此目的，GT耦合到MCFC以便利用未使用的燃料，提高气体组分温度，供应所需的二氧化碳，以及进一步的发电。此外，为了提高发电并改善整体效率，将TPV系统与蒸汽循环一起被添加到系统中，以分别从燃烧室辐射和阴极输出流中加热。通过Aspen Hysys和Matlab软件实现混合系统的仿真。通过敏感性分析，全面地研究了各个子系统对每个子系统以及所提出的混合系统的影响。得到的结果表明，增加MCFC温度降低了阳极，阴极和欧姆的过电位，同时增强了MCFC的输出电压，以增强MCFC性能。此外，MCFC的输出电压，功率密度和效率随着燃料消耗率的运行压力而增强。由于增强偏振损耗，MCFC的输出电压和功率密度随着燃料消耗速率而增加，而MCFC的电效率增强。优化第一和第二热交换器的输出温度提高了蒸汽涡轮机的功率约16 kW。在1厘米的电池和发射极距离获得TPV系统的最高功率密度和性能。将GT与MCFC合并，将系统的效率提高至54.83％。发现拟议的杂交系统的效率为67.3％。

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