摘要
基于对流动特性的观察，从二相流理论出发，提出了流体流动和颗粒循环模型，在φ１０４ｍｍ×１５００ｍｍ的流化床内，以水为流化介质，通过微机连续测定示踪剂浓度，得到不同颗粒体系，不同液体速度下床层内液体的平均停留时间分布和颗粒循环的平均速度，确定了模型参数，并给出了关联式，从而得到床层内径向流体速度分布和颗粒循环运动速度分布以及流体运动与颗粒运动之间的相互影响的关系式。将拟合结果与实验值比较，证实了模型的可行性及其新颖性，该模型较好地反映了液－固流化床内液体运动和颗粒运动的实际情况。
A model of fluid flow and particle circulation for a L/S fluidized system was developed from the theory of two-phase flow. Experiments were carried out in a cvlindrical fluidized bedof 104 mm diameter and 1500 mm height with continuous sampling technology by computer,withwater as fluidized medium. The mean residence time of fluid and the mean velocity ofparticle circulation were measured for various particle systems and at various flow rates. Themodel parameters were thus determined and correlations were given. Therefore, the velocitydistributions of the flow fluid and the relation between them in the fluidized bed can be predict-ed. Good agreement between the experimental data and those simulated ensures the feasibilityof the present model.
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
1995年第3期277-284,共8页
Chemical Reaction Engineering and Technology
