化工学报2001，Vol.52Issue(2)：108-113,6.
三相流化床间歇反应器中固体轴向浓度分布
AXIAL CONCENTRATION DISTRIBUTION OF PARTICLES IN GAS-LIQUID-SOLID FLUIDIZED SYSTEMS UNDER BATCHWISE OPERATION
摘要
Abstract
In a vertical gas-liquid-solid fluidized bed of 4.2 cm indiameter and 130 cm in height,the axial solid concentration distribution is investigated for both particles with different properties. Two distinguishing systems can be formed upon the wettable property of particle materials. One is called as a no-attached system in which the solid holdup decreases with increasing bed height. Another is named as an attached system in which solid holdup increases with the bed height. The sedimentation-dispersion model can be employed better to describe both above systems by modifying only a model parameter,i.e.the particle terminal settling velocity,which considers the effect of an additional drag force resulting from attached up-flowing bobbles and subtracts a certain value obtained by a function formula relating to the gas velocity. It is found that the axial concentration profiles of solid particles predicted by the modified sedimentation-dispersion model are in good agreement with experimental results for both no-attached and attached systems.关键词
三相流化床/沉降速度/沉降-扩散模型/固体轴向浓度分布分类
化学化工引用本文复制引用
林诚,林春深,张济宇..三相流化床间歇反应器中固体轴向浓度分布[J].化工学报,2001,52(2):108-113,6.基金项目
福建省教委资助项目(No.JB99040). （No.JB99040）
