多孔介质传质系数特性分析与研究

The Study And Analysis of The Mass Transfer Coefficient on Porous Media

以小型变压吸附制氧装置上进行的实验为基础，计算分析了v=0．05～0．27m／s，εb=0．32～0．47，dp=0．0016～0．0026m的传质系数。结果表明：1．传质系数随流速的增大而增大，且在较低流速范围内（v=0．05～0．1m／s），流速对传质系数的影响较大；2．传质系数与间隙率基本成线性关系，且随空隙率的增大而减小；3．传质系数随吸附介质颗粒直径的增大而明显减小。

Based on the experiment in a small-scale oxygen device by using PSA, the mass transfer coefficient was calculat- ed and analyzed between the value of the flow rate of 0.05 - 0.26 m/s, the closeness （ fractional void volume εb ） of 0. 32 -0.47, and the diameter of the adsorption media particle of 0.0016 -0. 0026 m. The results show as follows： 1. The mass transfer coefficient increases as the value of the flow rate of air increases. When the value of the flow rate is in a lower area （ v = 0. 05 - 0. 1 m/s）, the flow rate has dramatic effect on the mass transfer coefficient ; 2. The mass transfer coefficient and the closeness have a approximately linear relation, and as the closeness increases the mass transfer coefficient drops; 3. The mass transfer coefficient drops dramatically with the increase of the diameter of the adsorption media particle.