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Performance comparison of the mass transfer models with internal reforming for solid oxide fuel cell anodes

机译：带有内部重整的固体氧化物燃料电池阳极传质模型的性能比较

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摘要

In this work, models describing multicomponent gas diffusion process in an electrode of a porous solid oxide fuel cell (SOFC) anode coupled with internal reforming reactions were developed. The performances of three different types of models, the dusty-gas model (DGM), the binary-friction model (BFM) and the cylindrical pore interpolation model (CPIM), were compared in 1D. All these models take into account Knudsen diffusion and molecule-molecule diffusion can be used in transition region which is generally the case in a SOFC electrode. The developed models are able to predict the fuel components' molar fraction distributions in the anode electrode, and the concentration overpotential. They are capable of simulating the internal reforming process for hydrocarbon fuel, such as natural gas, with kinetic models considering both methane-steam reforming (MSR), and water-gas shift reaction (WSR). The effects of pressure gradient, pore size, current density, are studied. It was found that three models give similar results in difference cases using the same "tuned" tortuosity factor (τ~2). The difference caused using the isobaric assumption is negligible for the H_2-H_2O-Ar and CO-CO_2 system, expect at small pore sizes (under 1 urn) and high current density (above 1 A/cm~2). For a system fed with hydrocarbon fuel, the isobaric assumption will change the molar fraction distribution by up to 10% for different gas mixture components for the CPIM and the BFM, and up to 25% for the DGM at small pore sizes. However, the reaction rates for both MSR and WSR remain the same when the pressure variation is neglected.
机译：在这项工作中，建立了描述多组分气体在多孔固体氧化物燃料电池（SOFC）阳极电极中的扩散过程以及内部重整反应的模型。一维比较了三种不同类型的模型（粉尘气体模型（DGM），二元摩擦模型（BFM）和圆柱孔插值模型（CPIM））的性能。所有这些模型都考虑了Knudsen扩散，并且可以在过渡区中使用分子-分子扩散，这在SOFC电极中通常是这种情况。开发的模型能够预测阳极中燃料成分的摩尔分数分布以及浓度超电势。他们能够通过同时考虑甲烷蒸汽重整（MSR）和水煤气变换反应（WSR）的动力学模型来模拟碳氢化合物燃料（例如天然气）的内部重整过程。研究了压力梯度，孔径，电流密度的影响。发现在三个案例中，使用相同的“调谐”曲折因子（τ〜2）在不同情况下给出的结果相似。对于H_2-H_2O-Ar和CO-CO_2系统，使用等压假设引起的差异可忽略不计，预期在小孔径（小于1 um）和高电流密度（大于1 A / cm〜2）下发生。对于使用碳氢燃料的系统，对于小孔尺寸，对于CPIM和BFM，等压假设会使摩尔分数分布最多改变10％（对于CPIM和BFM的不同气体混合物组分），对于DGM，最多改变25％。但是，当忽略压力变化时，MSR和WSR的反应速率保持不变。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2012年第16期|p.3933-3945|共13页
  • 作者

    Shuping Wang; William M. Worek; W.J. Minkowycz;

  • 作者单位

    Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, 842 W Taylor Street, Chicago, IL 60607, United States;

    Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, 842 W Taylor Street, Chicago, IL 60607, United States;

    Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, 842 W Taylor Street, Chicago, IL 60607, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    solid oxide; fuel cell; internal reforming; model;

    机译：固体氧化物燃料电池;内部改革;模型;

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