Abstract A solid oxide fuel cell (SOFC) based power generation system with cascade configuration has been analyzed using the exergy-based analysis method. A cascade system has double SOFC stacks, where the unreacted fuel released from the primary SOFC stack is re-utilized in the secondary stack, generating additional power and maximizing fuel-use in the system. For comparison and evaluation, a simple SOFC system and an SOFC system with anode off-gas recirculation are also analyzed. In all the SOFC systems, efficiency increases with increasing fuel utilization. The simple and anode off-gas recirculation systems show 63.7% and 66.0% electrical efficiency at 85% and 90% fuel utilization, respectively. The cascade system shows 66.47% electrical efficiency at 90% fuel utilization, which is the highest electrical efficiency among the systems analyzed. Through the exergy analysis, the magnitude, location, and resources of the thermodynamic irreversibility within the SOFC systems are clearly identified, giving the quantified information why the cascade configuration has higher efficiency than the other configurations. The SOFC stack shows very high exergetic efficiency over 90%. In the cascade configuration, the released exergy from the primary SOFC stack can be exergetically-efficiently utilized in the secondary SOFC stack, contributing to a higher efficiency.

中文翻译：

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级联配置固体氧化物燃料电池发电系统的系统仿真与火用分​​析

摘要 使用基于火用的分析方法分析了具有级联配置的基于固体氧化物燃料电池（SOFC）的发电系统。级联系统具有双 SOFC 堆，其中从初级 SOFC 堆释放的未反应燃料在次级堆中重新利用，从而产生额外的功率并最大限度地提高系统中的燃料使用率。为了比较和评估，还分析了一个简单的 SOFC 系统和一个带有阳极废气再循环的 SOFC 系统。在所有 SOFC 系统中，效率随着燃料利用率的增加而增加。简单和阳极废气再循环系统分别在 85% 和 90% 的燃料利用率下显示出 63.7% 和 66.0% 的电效率。级联系统在 90% 的燃料利用率下显示 66.47% 的电气效率，这是所分析系统中最高的电气效率。通过火用分析，可以清楚地识别 SOFC 系统内热力学不可逆性的大小、位置和资源，从而提供量化信息，为什么级联配置比其他配置具有更高的效率。SOFC 堆显示出超过 90% 的非常高的火用效率。在级联配置中，从主 SOFC 堆释放的火用可以在二级 SOFC 堆中有效利用，从而有助于提高效率。