Efficiency Enhancement on Solid Oxide Fuel Cell system with anode off-gas recycle by evaluating entropy and exergy change

IF 4.6 Q2 CHEMISTRY, PHYSICAL Journal of Power Sources Advances Pub Date : 2025-04-01 Epub Date: 2025-02-08 DOI:10.1016/j.powera.2025.100172

Hsin-Yi Lai , Hung-Ju Lin , Yen-Hsin Chan

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Abstract

The aim of this paper is to enhance the efficiency of the Solid Oxide Fuel Cell (SOFC) system through various system designs and parameters. To evaluate the effects of design configurations, the impact of high-temperature/low-temperature anode off-gas recycle (HT/LT-AGR) on system performance was investigated by calculating the entropy using the second law of thermodynamics. By analyzing the system with different AGR designs and considering the increasing entropy of heat components in the SOFC system, the efficiency calculations can be more practical and accurate.

In this study, the working efficiency of the SOFC system with HT-AGR is 56.215 %, which is 4.7 % higher than with LT-AGR. The results show that the heat exchanger (HEX) experiences the largest increasing entropy during the power generation process due to the significant temperature difference. At the end of this project, a _CO2 reformer will be used to optimize the system, decreasing the mole rate of _CO2 and CH4 while increasing the mole rate of H2. Based on the simulation results, using a _CO2 reformer can increase the mole rate of H2 by 3 %, improving the system efficiency up to 56.97 %.

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基于熵和火用变化的阳极废气循环固体氧化物燃料电池系统效率提高研究

本文的目的是通过各种系统设计和参数来提高固体氧化物燃料电池（SOFC）系统的效率。为了评估设计配置的影响，利用热力学第二定律计算熵，研究了高温/低温阳极废气回收（HT/LT-AGR）对系统性能的影响。通过对不同AGR设计的系统进行分析，并考虑SOFC系统中热组分熵的增加，使效率计算更加实用和准确。在本研究中，HT-AGR的SOFC系统的工作效率为56.215%，比LT-AGR的工作效率高4.7%。结果表明：在发电过程中，由于温差较大，换热器（HEX）的熵增量最大；在本项目结束时，将使用CO2重整器对系统进行优化，降低CO2和CH4的摩尔率，同时提高H2的摩尔率。模拟结果表明，采用CO2重整器可使H2的摩尔率提高3%，使系统效率提高56.97%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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