Study on the redistribution mechanism and secondary purge strategy of proton exchange membrane fuel cells

IF 10.1 1区 工程技术 Q1 ENERGY & FUELS Applied Energy Pub Date : 2024-11-04 DOI:10.1016/j.apenergy.2024.124755
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Abstract

Effective control of membrane water content is essential for increasing the space for ice formation during the cold start stage and enhancing the success rate of start-up. Shutdown purge can effectively lower the membrane water content following fuel cell operation. However, during the cooling and standing process after purge, the rapid change in saturated vapor pressure can result in the redistribution of membrane dissolved water, leading to an increase in its content and a reduction in the success rate of cold start. Therefore, this study establishes a multidimensional, multiphase simulation model to comprehensively and thoroughly analyze the redistribution mechanism after purging and investigates the relationship between membrane water content and cold start. This is achieved by identifying the maximum membrane water content boundary during the cold start process and ultimately improving the success rate of cold start through a secondary purge strategy. The research results indicate that the membrane water content of the fuel cell increases from 2.31 to 8.31 after redistribution. During the cold start stage, the cold start success of the fuel cell under different environmental temperatures exhibits relatively specific boundary conditions, with the cold start process being closely related to the load current density and initial membrane water content. After implementing the secondary purging strategy, the membrane water content of the fuel cell decreases again, displaying favorable cold start characteristics in the cold start stage and successfully starting at −10 °C. This study can provide a reliable basis for the development of purging strategies during shutdown and offer a theoretical foundation for the boundary identification process of cold start.
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质子交换膜燃料电池的再分配机制和二次净化策略研究
有效控制膜水含量对于增加冷启动阶段的结冰空间和提高启动成功率至关重要。关机吹扫可有效降低燃料电池运行后的膜含水量。然而,在吹扫后的冷却和静置过程中,饱和蒸汽压的快速变化会导致膜溶解水的重新分布,从而导致其含量增加,降低冷启动的成功率。因此,本研究建立了多维、多相模拟模型,全面、深入地分析了吹扫后的再分布机理,并研究了膜水含量与冷启动之间的关系。通过确定冷启动过程中膜含水量的最大边界,最终通过二次吹扫策略提高冷启动的成功率。研究结果表明,燃料电池的膜水含量在重新分配后从 2.31 增加到 8.31。在冷启动阶段,不同环境温度下燃料电池的冷启动成功率呈现出相对特定的边界条件,冷启动过程与负载电流密度和初始膜含水量密切相关。在实施二次吹扫策略后,燃料电池的膜含水量再次降低,在冷启动阶段表现出良好的冷启动特性,并在-10 °C时成功启动。这项研究可为关机期间吹扫策略的开发提供可靠依据,并为冷启动的边界识别过程提供理论基础。
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来源期刊
Applied Energy
Applied Energy 工程技术-工程:化工
CiteScore
21.20
自引率
10.70%
发文量
1830
审稿时长
41 days
期刊介绍: Applied Energy serves as a platform for sharing innovations, research, development, and demonstrations in energy conversion, conservation, and sustainable energy systems. The journal covers topics such as optimal energy resource use, environmental pollutant mitigation, and energy process analysis. It welcomes original papers, review articles, technical notes, and letters to the editor. Authors are encouraged to submit manuscripts that bridge the gap between research, development, and implementation. The journal addresses a wide spectrum of topics, including fossil and renewable energy technologies, energy economics, and environmental impacts. Applied Energy also explores modeling and forecasting, conservation strategies, and the social and economic implications of energy policies, including climate change mitigation. It is complemented by the open-access journal Advances in Applied Energy.
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