小颗粒滴流床反应器中液相轴向返混的研究  

Axial Backmixing of Liquid Phase in Trickle-Bed Reactors

作　　者：张建飞[1] 葛世英[2] 李盘生[3] 

机构地区：[1]杭州国家海洋局第二海洋研究所 [2]上海交通大学 [3]华东化工学院化学工程系

出　　处：《华东化工学院学报》1990年第2期118-125,共8页

摘　　要：对三种形状六种尺寸的小颗粒填料,在滴流床中气液两相并流向下流动时液相的轴向返混程度作了研究。实验表明:随着液速的增加,填料颗粒的毕克力Pe_L值增大,返混程度降低;填料颗粒的球形度越小,Pe_L值就越小,返混程度就越大;填料颗粒的尺寸对返混也有影响,尤其是对非球形颗粒,尺寸越大,则Pe_L值越大。当气液两相流速不断增大时,床层中的流动状态从滴流区转变为脉动区,则液体性质对Pe_L值的影响也不同。给出了两个流区的Pe_L关联式。In trickle-bed reactor packed with small spherical, cylindrical, and trilobe particles, the residence time distribution(RTD) curves of liquid phase were determined by tracer method for several kinds of gas-liquid systems at 303±1 K. The results show that the influeunce of properties of liquid on Peclet number is dependent on the hydrodynamic regime. The Peclet number increases during the transition from trickier-flow regime into pulse-flow regime. It also increases with size of packing except for spherical particles, in which the Peclet number slightly depends on the size. The non-spherical particles have lower Peclet number than that for spherical particles. The Peclet number was correlated by taking hydrodynamic flow regime into account:In trickle-flow regime:In pulse-flow regime:

关 键 词：固定床 滴流床 反应器 填料 返混 

分 类 号：TQ051.14[化学工程]