GAS MIXING IN A COCURRENT DOWNFLOW CIRCULATING FLUIDIZED BED

魏飞; 刘金忠; 金涌; 俞芷青

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GAS MIXING IN A COCURRENT DOWNFLOW CIRCULATING FLUIDIZED BED

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- GAS MIXING IN A COCURRENT DOWNFLOW CIRCULATING FLUIDIZED BED
- CIESC Journal Issue 4, (1994)
- 作者机构：
  
  清华大学化工系!北京100084,清华大学化工系!北京100084,清华大学化工系!北京100084,清华大学化工系,北京,100084
- 作者简介：
- 基金信息：
- DOI：
  CLC： Q021
- Online First：25 August 1994，
  
  Published：25 August 1994
- 稿件说明：
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魏飞, 刘金忠, 金涌, et al. GAS MIXING IN A COCURRENT DOWNFLOW CIRCULATING FLUIDIZED BED[J]. CIESC Journal, 1994, (4).
DOI：

魏飞, 刘金忠, 金涌, et al. GAS MIXING IN A COCURRENT DOWNFLOW CIRCULATING FLUIDIZED BED[J]. CIESC Journal, 1994, (4). DOI：

摘要

采用氢气稳态示踪方法在内径140mm的气固并流下行循环流化床中对气体扩散行为进行了实验研究.实验结果表明:下行床中气体扩散行为可用二维拟均相模型进行描述

其气体的径向扩散系数与气速、固体循环量及颗粒密度的关系可用下列准数关联式表示Pe_r=4.35×10_(-3)Re~(0.95)ε~(-73.4) 1>ε>0.99而下行床中气体轴向扩散系数要比提升管中小1个数量级以上.

Abstract

An experimental study on the gas dispersion behavior of cocurrent downflow gas-solid suspension in a 140 mm i. d. circulating fluidized beds (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 eddy diffusion mechanics and a proposed two dimensional dispersed plug- flow model fits the experimental data very well. The correlation Per = 4. 35× 10-3Re0.95ε-73.4(while 1>ε>0. 99) for radial diffusion coefficient is obtained. It is found that the obtained axial diffusion coefficient in the CDCFB is much lower than that in a circulating fluidized bed.

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