Interfacial permeation phenomena of hydrogen purification and carbon dioxide separation in a non-isothermal palladium membrane tube
Interfacial permeation phenomena of hydrogen purification and carbon dioxide separation in a non-isothermal palladium membrane tube
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DOI：
10.1016/j.cej.2016.01.036
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发表时间：
2016-12-01
影响因子：
15.1
通讯作者：
Yu, Ching-Tsung
中科院分区：
文献类型：
--
作者：
Chen, Wei-Hsin;Lin, Charng-Hung;Yu, Ching-Tsung
在钯（Pd）膜管中，氢和二氧化碳可以从它们的气体混合物中分离出来。为了研究非等温钯膜管中氢的渗透特性，提出了一种数值计算方法。分析了保留侧和渗透侧雷诺数、原料气和扫气温度、原料气中H-2浓度对界面H-2渗透和H-2回收率的影响。结果表明，膜表面的H2分压差和渗透率最小，这是膜透性和H-2分压差竞争的结果。采用无量纲传质参数（xi），即H-2在气相中的扩散与H-2在膜上的渗透之间的无量纲驱动力比，以帮助说明沿膜表面的传质特性。xi曲线对雷诺数不敏感，但对界面温度和H-2入口浓度有显著影响。当H-2进口浓度较低时，原料气中的H-2可全部回收，不再出现最小分布。这也意味着所有的二氧化碳都被分离了。(C) 2016 Elsevier B.V.版权所有
Hydrogen can be purified and carbon dioxide can be separated from their gas mixtures in a palladium (Pd) membrane tube. To figure out the hydrogen permeation characteristics in a non-isothermal Pd membrane tube, a numerical method is developed. The influence of the Reynolds numbers at the retentate and permeate sides, the temperatures of feed gas and sweep gas, and the H-2 concentration in the feed gas on the interfacial H-2 permeation and H-2 recovery are analyzed. The results indicate that the minimum H2 partial pressure difference and permeation rate along the membrane surface develops, as a consequence of competition between the membrane permeance and the H-2 partial pressure difference. A dimensionless mass transfer parameter (xi), which is a non-dimensional driving force ratio between H-2 diffusion in the gas phase and H-2 permeation across the membrane, is conducted to aid in illustrating the mass transfer characteristics along the membrane surface. The xi curve is insensitive to the Reynolds numbers, but depends significantly on interfacial temperature and H-2 inlet concentration. When the H-2 inlet concentration is low, all H-2 in the feed gas can be recovered and the minimum distribution no long appears. This also implies that all CO2 is separated. (C) 2016 Elsevier B.V. All rights reserved.