Performance analysis of a natural gas-fueled 1 kW solid oxide fuel cell-combined heat and power system with off-gas recirculation of anode and cathode

IF 2.6 4区工程技术 Q3 ELECTROCHEMISTRY

Fuel Cells Pub Date : 2022-12-04 DOI:10.1002/fuce.202200099

Li Wencong, Li Siyuan, Zhang Zhe, Bai Shuzhan, Li Guoxiang, Ma Kongrong, Qu Yao

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引用次数: 0

Abstract

Both anode off-gas recirculation (AOGR) and cathode off-gas recirculation (COGR) can increase the performance of solid oxide fuel cell-combined heat and power (SOFC-CHP) systems on their own, however, they both have unavoidable drawbacks. Thus, the combined effect of both on the system is worth investigating. The essential challenge is to figure out what the best AOGR and COGR ratios are under the combined situation. In this paper, the effects of varied AOGR ratios and COGR ratios on the system performance were investigated. A model of a 1 kW natural gas-fueled SOFC-CHP system was constructed which uses Cycle-Tempo software. It is demonstrated that moderate AOGR can improve the net electrical efficiency, but too much AOGR will reduce the H₂ concentration at the anode inlet and prevent the stack from working properly; moderate COGR can improve the thermal efficiency, but too much COGR can lead to large changes in current density variation and cause drastic changes in current, which affects the system and external electrical equipment. While, combining AOGR with COGR can improve both the net electrical and thermal efficiency, which results in higher total efficiency. As a result, the combined configuration of an AOGR ratio of 0.4 and a COGR ratio of 0.4 is recommended. In this scenario, the net electrical efficiency of the system is 47.38%, the thermal efficiency is 28.98%, the total efficiency is 76.37%, and the actual fuel utilization rate is 0.834.

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以天然气为燃料的1kw固体氧化物燃料电池-阳极和阴极废气再循环的热电联产系统的性能分析

阳极废气再循环(AOGR)和阴极废气再循环(COGR)都可以提高固体氧化物燃料电池热电联产(SOFC - CHP)系统的性能，但它们都有不可避免的缺点。因此，两者对系统的综合影响值得研究。最基本的挑战是找出在综合情况下的最佳AOGR和COGR比率。本文研究了不同的AOGR和COGR对系统性能的影响。利用Cycle - Tempo软件构建了1 kW天然气燃料SOFC - CHP系统模型。结果表明，适度的AOGR可以提高净电效率，但过多的AOGR会降低阳极入口处的H2浓度，影响电池组的正常工作;适度的COGR可以提高热效率，但过高的COGR会导致电流密度变化较大，引起电流剧烈变化，影响系统和外部电气设备。而将AOGR与COGR相结合可以提高净电效率和热效率，从而提高总效率。因此，建议AOGR为0.4,COGR为0.4的组合配置。在此场景下，系统净电效率为47.38%，热效率为28.98%，总效率为76.37%，实际燃料利用率为0.834。

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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来源期刊

Fuel Cells 工程技术-电化学

CiteScore

5.80

自引率

3.60%

发文量

审稿时长

3.7 months

期刊介绍： This journal is only available online from 2011 onwards. Fuel Cells — From Fundamentals to Systems publishes on all aspects of fuel cells, ranging from their molecular basis to their applications in systems such as power plants, road vehicles and power sources in portables. Fuel Cells is a platform for scientific exchange in a diverse interdisciplinary field. All related work in -chemistry- materials science- physics- chemical engineering- electrical engineering- mechanical engineering- is included. Fuel Cells—From Fundamentals to Systems has an International Editorial Board and Editorial Advisory Board, with each Editor being a renowned expert representing a key discipline in the field from either a distinguished academic institution or one of the globally leading companies. Fuel Cells—From Fundamentals to Systems is designed to meet the needs of scientists and engineers who are actively working in the field. Until now, information on materials, stack technology and system approaches has been dispersed over a number of traditional scientific journals dedicated to classical disciplines such as electrochemistry, materials science or power technology. Fuel Cells—From Fundamentals to Systems concentrates on the publication of peer-reviewed original research papers and reviews.