微通道反应器内毫秒级甲烷蒸汽重整过程分析

Process Analysis of Steam Reforming of Methane under Milliseconds Contact Time in Micro-reactors

微通道反应器具有强化热量和质量传递、流动均一、无放大效应等优点。本文建立了微通道反应器模型,模拟了高活性Rh催化剂在微通道反应器内催化甲烷蒸汽重整过程,预测操作条件和反应器结构参数对毫秒级重整过程的影响。结果表明:增大反应器壁面温度、减小空速、减小微通道高度均可以增大过程转化率;其中微通道高度严重影响反应的转化率,特征尺寸小于500μm的微通道反应器能够达到毫秒级操作要求。

Micro-reactor has drawn more and more attention in recent years,due to the Features of process intensification of both mass and heat transfer,uniform flow field and easy scale-up. A two-dimensional micro-channel reactor model for millisecond steam reforming of methane (SRM) was established,and the process of SRM based on highly active rhodium catalysts in the micro-channel reactor was simulated to predict the influence of operating conditions and reactor structure designs. The results showed that a higher wall temperature,a lower space velocity and a larger amount nf catalyst loading would benefit the conversion of methane. There existed a critical amount of ratalyst loading for a specifically structured micro-channel,upon which the catalyst loading made limited impact on the con version,e.g.,the thickness of catalyst coating above 50μm. The channel gap played a key role in the structure design of reactor,where a smaller gap(e.g.,<500μm) would lead to a higher conversion of methane under milliseconds contact time.