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Dynamic characteristics of a solid oxide fuel cell with direct internal reforming of methane

机译：甲烷直接内部重整的固体氧化物燃料电池的动态特性

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摘要

An analysis of a solid oxide fuel cell (SOFC) working with direct internal reforming of methane when subjected to unsteady conditions is presented in this paper. A cell of planar type with the anode-supported structure and the co-flow configuration is investigated. Owing to the reforming and the water-gas shift reactions, it has been known that the steady operation of a cell working with natural gas is different from that with hydrogen. Moreover, since these chemical reactions are strongly temperature-dependent, the former is expected to become much more complex than the latter under unsteady states. It is necessary in the viewpoints of degradation and performance efficiency to understand the evolution of the thermal gradient/stress, the fuel concentration, etc. when the cell is subjected to changes such as load demand. In this work, a three-dimensional numerical model is employed and step changes of the output voltage are introduced to the cell. Results for the temporal profiles of the temperature, the current density, the activation overpotential and the gas concentration distributions in the cell are presented and discussed. It is found that the overshoot in the activation does not appear throughout the cell, but only in the exit region when the voltage jumps from 0.7 V to 0.6 V. (C) 2016 Elsevier Ltd. All rights reserved.
机译：本文介绍了在不稳定条件下对甲烷进行直接内部重整的固体氧化物燃料电池（SOFC）的分析。研究了具有阳极支撑结构和同流构造的平面型电池。由于重整和水煤气变换反应，已知使用天然气的电池的稳定运行不同于使用氢的电池的稳定运行。此外，由于这些化学反应强烈依赖于温度，因此在不稳定状态下，前者比后者复杂得多。从降级和性能效率的角度出发，有必要了解当电池经受诸如负载需求之类的变化时热梯度/应力，燃料浓度等的变化。在这项工作中，采用了三维数值模型，并将输出电压的阶跃变化引入了电池。给出并讨论了温度，电流密度，活化超电势和电池中气体浓度分布的时间分布结果。发现激活中的过冲不会在整个电池中出现，而只会在电压从0.7 V跃升至0.6 V时出现在退出区域中。（C）2016 Elsevier Ltd.保留所有权利。

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