GAS MIXING IN THE COCURRENT DOWNFLOW CIRCULATING FLUIDIZED-BED

被引：26
|
作者：
WEI, F
JIN, Y
YU, ZQ
LIU, JZ
机构：
[1] Department of Chemical Engineering, Tsinghua University, Beijing
来源：
CHEMICAL ENGINEERING & TECHNOLOGY | 1995年 / 18卷 / 01期
关键词：
D O I：
10.1002/ceat.270180111
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
An experimental study on the gas dispersion behaviour of a cocurrent downflow gas-solids suspension in a 140 mm i.d. circulating fluidised bed (CDCFB) using the steady-state tracer method is presented. The influence of gas velocity, solids circulating rate and particle density on radial gas dispersion has been examined. Gas dispersion can well be described by an eddy diffusion mechanism and a proposed two dimensional dispersed plug-flow model can fit the experimental data very well. Correlations of the radial diffusion coefficient were obtained. It is found that the axial diffusion coefficient obtained in the CDCFB is much lower than that in conventional circulating fluidised beds.
引用
收藏
页码：59 / 62
页数：4
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