A model for predicting bubble rise velocity in a pulsed gas solid fluidized bed  

作　　者：Dong Liang Zhao Yuemin Luo Zhenfu Duan Chenlong Wang Yingwei Yang Xuliang Zhang Bo 

机构地区：[1]School of Chemical Engineering and Technology, China University of Mining & Technology

出　　处：《International Journal of Mining Science and Technology》2013年第2期233-236,共4页矿业科学技术学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China for Innovative Research Group (No.51221462);the National Natural Science Foundation of China (Nos.51134022 and 51174203);the State Key Basic Research Program of China (No.2012CB214904);Specialized Research Fund for the Doctoral Program of Higher Education (No.20120095130001);the Fundamental Research Funds for the Central Universities (No.2013DXS02)

摘　　要：Bed stability, and especially the bed density distribution, is affected by the behavior of bubbles in a gas solid fluidized bed. Bubble rise velocity in a pulsed gas-solid fluidized bed was studied using photographic and computational fluid dynamics methods. The variation in bubble rise velocity was investigated as a function of the periodic pulsed air flow. A predictive model of bubble rise velocity was derived: ub=ψ(Ut+Up-Umf)+kp(gdb)(1/2). The software of Origin was used to fit the empirical coefficients to give ψ = 0.4807 and kp = 0.1305. Experimental verification of the simulations shows that the regular change in bubble rise velocity is accurately described by the model. The correlation coefficient was 0.9905 for the simulations and 0.9706 for the experiments.Bed stability, and especially the bed density distribution, is affected by the behavior of bubbles in a gas solid fluidized bed. Bubble rise velocity in a pulsed gas-solid fluidized bed was studied using photographic and computational fluid dynamics methods. The variation in bubble rise velocity was investigated as a function of the periodic pulsed air flow. A predictive model of bubble rise velocity was derived: ub=ψ(Ut+Up-Umf)+kp(gdb)(1/2). The software of Origin was used to fit the empirical coefficients to give ψ = 0.4807 and kp = 0.1305. Experimental verification of the simulations shows that the regular change in bubble rise velocity is accurately described by the model. The correlation coefficient was 0.9905 for the simulations and 0.9706 for the experiments.

关 键 词：Pulsed fluidized bed Bubble Rise velocity Prediction model 

分 类 号：TD94[矿业工程—选矿]