Constraint strength and axial/radial particle velocity profiles for an integrated riser outlet

作     者：Dewu Wang Chaoyu Yan Chunxi Lu Rui Li Bin Zhao Shaofeng Zhang 

作者机构：School of Chemical EngineeringHebei University of Technology State Key Laboratory of Heavy Oil ProcessingChina University of Petroleum Engineering Research Center of Seawater Utilization Technology of Ministry of EducationHebei University of Technology 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2015年第13卷第4期

页      面：179-186页

核心收录：

学科分类：080706[工学-化工过程机械] 07[理学] 08[工学] 0807[工学-动力工程及工程热物理] 070204[理学-等离子体物理] 0702[理学-物理学] 

基　　金：support from the National Natural Science Foundation of China(Grant nos.21106028 and 20976190) the Hebei Province Natural Science Foundation of China(Grant no.B2013202125) 

主　　题：Combined fluidized bed Riser Outlet structure Particle velocity Constraint strength 

摘      要：To study axial/radial profiles of particle velocity in the affected region of an integrated riser outlet, a cold model was developed for the integrated riser reactor combining the gas-solid distributor with the fluidized bed. Constraints, related to the gas-solid distributor and the upper fluidized bed, imposed on the particle flow in the riser outlet region, were investigated experimentally. The experimental results showed that with increasing superficial gas velocity, these constraints have strong influences on particle flow behavior, the particle circulation flux in the riser, and the height of the static bed material of the upper fluidized bed. When the constraints have greater prominence, the axial profile of the cross-sectionally averaged particle velocity in the outlet region initially increases and then decreases, the rate of decrease being proportional to the constraint strength. Along the radial direction of the outlet section, the region where the local particle velocity profile tends to decrease appears near the dimensionless radius r/R = 0.30 initially and then, with increasing constraint strength, gradually extends to the whole section from the inner wall. Based on the experimental data, an empirical model describing the constraint strength was established. The average relative error of the model is within 7.69%.