Fluidization Characteristics in Micro‐Fluidized Beds of Various Inner Diameters
Fluidization Characteristics in Micro‐Fluidized Beds of Various Inner Diameters
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DOI：
10.1002/ceat.200900092
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发表时间：
2009-12
影响因子：
2.1
通讯作者：
Q. Guo;Yi-Qiang Xu;Xuehai Yue
中科院分区：
文献类型：
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作者：
Q. Guo;Yi-Qiang Xu;Xuehai Yue
考察了石英砂和催化裂化催化剂颗粒在6个内径分别为4.3、5.5、10.5、15.5、20.5和25.5 mm的微床中的流态化特性。考察了床层直径(Dt)、静态床层高度(H S)、颗粒和气体性质对压降和最小流态化速度(UMf)的影响。结果表明，在不同的颗粒和气体性质下，微流化床的理论压降与实验值存在一定的偏差。这可能是由于在较小的床径下床层空隙率增加所致。常规流态化的计算公式不适用于微型流态化。Umf随Dt的减小而增大。当S与Dt之比为1：1~3：1时，u-Mf与H-S呈线性关系，且u-Mf-H-S的斜率随Dt的增大而减小。本文将Dt/dp和H-S/dp定义为无因次变量，建立了在本实验条件下预测微床内uMf的新方程。
The fluidization characteristics of quartz sand and fluid catalytic crack (FCC) catalyst particles in six micro-fluidized beds with inner diameters of 4.3, 5.5, 10.5, 15.5, 20.5, and 25.5 mm were investigated. The effects of bed diameter (D t ), static bed height (H s ), particles and gas properties on the pressure drop and minimum fluidization velocity (u mf ) were examined. The results show that the theoretical pressure drops of micro-fluidized beds deviated from the experimental values under different particles and gas properties. The possible reason is due to an increase in bed voidage under smaller bed diameters. The equations for conventional fluidized beds did not fit for micro-fluidized beds. u mf increased with decreasing D t . When the ratio of H s to D t ranged from 1:1 to 3:1, u mf was characterized by a linear equation with H s , while the slope of the equation u mf versus H s decreased with increasing D t . In this paper, D t /d p and H s /d p were defined as dimensionless variables and a new equation was developed to predict u mf in micro-fluidized beds under the present experimental conditions.