径向流吸附器布气系统结构对布气效果的影响

Effect of the gas distribution system structure of a radial flow adsorber on gas distribution

径向流吸附器内的均匀布气对其性能有重要影响.本文以实验室用小型径向流吸附器为研究对象,建立了三维流动数学模型,并对径向流吸附器内部的流场进行了数值模拟.对比研究了径向流吸附器内气体流动型式、中心流道与外流道的截面积比、中心流道开孔率、外流道开孔率等对流场均匀分布的影响.结果表明:径向流吸附器采用向心流动的最为合适,并且Π型向心流动略优于Z型向心流动;中心流道与外流道的截面积比为18.9%时,获得最佳布气效果;中心流道开孔率越小,径向流速度不均匀度值越小,布气效果越好,但开孔率过低将导致布气孔附近局部布气不均匀,能耗增大;外流道开孔率变化对径向流吸附器内气流均布影响有限.

Uniform gas distribution in a radial flow adsorber plays an essential part in its performance. A 3D hydrodynamic and mathematical model of the radial flow adsorber was developed based on experimental studies. The effects of flow patterns, the cross-section ratio of central channel to outer channel, and the opening ratios of the central channel and the outer channel were comparatively studied by using this model. Radial inward flow was proved to have a better performance than radial outward flow, and the∏ type of inward flow is a little better than that of the Z type of inward flow. The best effect can be obtained when the cross-section ratio of cen-tral channel to outer channel is 18. 9%. The radial non-uniformity of velocity decreases with the decrease of the opening ratio of the central channel, and the effect of flow distribution is better. But if the opening ratio of the central channel is too low, it will cause une-ven local flow distribution and high energy consumption. The opening ratio of the outer channel has a little influence on flow distribu-tion in the radial flow adsorber.