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首页> 外文期刊>Renewable Power Generation, IET >Thermo-mechanical stress in tubular solid oxide fuel cells: Part I ?? transient operating behaviour and the relevance of material creep
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Thermo-mechanical stress in tubular solid oxide fuel cells: Part I ?? transient operating behaviour and the relevance of material creep

机译：管状固体氧化物燃料电池中的热机械应力：第一部分瞬态运行行为与材料蠕变的相关性

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摘要

A spatially discretised thermo-electrochemical model is developed to calculate the temperature distribution in a tubular solid oxide fuel cell (SOFC). Model validation is accomplished based on the operating data from a demonstration plant. Using a mechanical model of the ceramic membrane-electrode assembly, the distribution of thermo-mechanical stress is calculated from the temperature profile. The resulting risk of fracture failure, being one of the crucial life-limiting factors of SOFC, is determined by means of Weibull analysis. The methodology and results are presented in two parts: Part I covers the dynamic operating properties of the SOFC and the time scale of material creep in its ceramic components. Part II deals with the risk of fracture failure related to transient operating scenarios, discusses its dependency on the operating conditions and derives a low-risk operating strategy. The dynamic operating behaviour is found to be dominated by the large thermal inertia of the solid cell components. An analysis of the creep relaxation indicates a significant relief of mechanical stress in the electrodes within a few hours of operation. This justifies a novel assumption regarding the stress-free state in the mechanical analysis of the fuel cell, which significantly increases the plausibility of the resulting risk of fracture failure.
机译：建立了空间离散的热电化学模型，以计算管状固体氧化物燃料电池（SOFC）中的温度分布。根据验证工厂的运行数据来完成模型验证。使用陶瓷膜电极组件的机械模型，从温度曲线计算出热机械应力的分布。最终断裂失败的风险是SOFC的关键寿命限制因素之一，可通过Weibull分析来确定。方法和结果分为两个部分：第一部分介绍了SOFC的动态运行特性以及陶瓷组件中材料蠕变的时间尺度。第二部分讨论了与瞬态作业场景相关的断裂失效风险，讨论了其对作业条件的依赖性，并得出了低风险的作业策略。发现动态操作行为主要由固体电池组件的大热惯性决定。蠕变松弛的分析表明，在运行几个小时内，电极中的机械应力得到了显着缓解。这证明了关于燃料电池的机械分析中的无应力状态的新假设是合理的，该假设显着增加了导致断裂破坏的风险的合理性。

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