蜂窝体催化燃烧反应器中流动特性的数值模拟

Simulation of catalytic combustion flows in honeycomb reactors

研究了伴有反应条件下蜂窝体催化反应器的流动性能。建立了包括流动、传热和传质的反应器模型 ,使用有限体积法求解模型方程组 ,基于模拟结果分析了进口浓度、进口温度、进口流速、反应活性等操作参数对流动性能的影响 ,结果表明通道内速度分布仍为抛物线型 ;对压降的模拟结果与哈根 泊谡叶方程的计算结果的比较表明 ,后者用于反应器压降设计偏差较大 。

Reactive flow characteristics of a honeycomb catalytic reactor were studied under reaction conditions with the catalytic combustion of methane as the model reaction. A two dimensional reactor model including the balance equations of mass, heat and momentum transport is solved by utilizing a CFD method. Based on the simulation results, the effects of the process parameters such as feed composition, inlet velocity and inlet temperature on the reactive flows were investigated. The results show that under the simulated conditions, the velocity profiles in channels are parabolic as in the case of laminar flows. Comparison of the model prediction with evaluated values of the conventional Hagen Poiseuille equation shows that the Hagen Poiseuille equation under estimates values of pressure drop in all simulated cases, while the relative deviation, around 40% in most cases, is highly related to the conversion degree and rate of reactions of interest.