微细通道尺寸对甲醇水蒸汽重整反应性能影响

Effect of Microchannel Size on Performance of Methanol Steam Reforming

针对微细通道反应器内甲醇水蒸汽重整制氢反应,建立了二维稳态多组分传输反应模型。分析了通道几何尺寸的变化对产物的组成以及通道内部温度分布的影响。结果表明,通道长高比的增加能增强通道壁面与流体的换热性能,提高甲醇转化率和产物中氢含量,但同时也会造成产物中 CO 含量的增加,影响到质子交换膜燃料电池的正常工作。

A two-dimensional, steady-state, mutil-component transport ano reaction model was established for hydrogen production by methanol steam reforming in a micro-channel reactor. Effects of the reactor channel geometry on the reformate composition and the temperature distribution in the channel was analyzed by numerical simulation method. The results showed that the heat transfer between the wall and the reaction fluid could be enhanced with the increase of the channel length to height ratio, consequently the methanol conversion and hydrogen concentration in the reformate were also improved. At the same time, however, more CO would be produced, which is harmful to the operation of Proton Exchang Membrane Fuel Cell （PEMFC）.