Qualitative Investigation on Effects of Manifold Shape on Methanol Steam Reforming for Hydrogen Production
首发时间:2011-05-11
Abstract:Fluid velocity distribution among microchannels plays important role on the reaction performances. In this work, the velocity distribution among microchannels with two different manifold structures is compared by a three-dimensional CFD model under two situations respectively, no reaction and methanol steam reforming occurs. Then the performances of methanol steam reforming in both plates are experimentally investigated, and the effect of manifold shape on the hydrogen production performances is qualitatively analyzed by the combination of simulation results of velocity distribution. It is found that the microchannel plate with right-angle manifold enables narrow velocity distributions under different entrance velocities and reaction temperatures, whether no reaction occurs or methanol steam reforming is progressing, which can be the critical element results in better conversion rate and selectivity of process than that of the microchannel plate with oblique-angle manifold. Optimizing the structural parameters to facilitate a relatively uniform velocity distribution to increase the hydrogen production performances may be a key factor to be considered.
keywords: methanol steam reforming velocity distribution hydrogen production
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分布腔形状对甲醇水蒸气重整制氢性能影响的定性分析
摘要:微通道之间的流体速度分布对反应性能有很大影响。本研究中,利用一个三维CFD模型来分析两种不同分布腔结构下微通道之间流速分布情况进行分析,并对在没有反应和进行甲醇水蒸气重整反应两种情况下进行对比。进一步通过实验研究两种板内的甲醇水蒸气重整反应性能,并且与流速分布模拟分析结果相对比进行分布腔形状对甲醇重整制氢性能影响的定性分析。结果表明无论是没有反应发生还是有甲醇水蒸气重整反应,带有直角三角形分布腔在不同的入口速度和反应温度下微通道之间流速分布比带有斜角三角形分布腔的更加均匀,并且流速分布均匀是导致获得较佳反应性能的必要元素。如何通过优化结构参数来获取相对均匀流速分布是提高制氢性能的一个需要考虑的关键因素。
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No.4425001587741130****
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