CFD-DEM investigation into flow characteristics in mixed pulsed fluidized bed under electrostatic effects

作     者：Hongwei Li Lei Wang Changhe Du Wenpeng Hong Hongwei Li;Lei Wang;Changhe Du;Wenpeng Hong

作者机构：School of Energy and Power EngineeringNortheast Electric Power UniversityJilin 132012China 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2022年第20卷第7期

页      面：100-112页

核心收录：

学科分类：08[工学] 080103[工学-流体力学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0801[工学-力学（可授工学、理学学位）] 

基　　金：The financial support of the National Nature Science Foundation of China(No.51406031) the Science Foundation of the Jilin Province Science and Technology Agency(Grant No.20160520032JH,20170101123JC)are gratefully acknowledged。 

主　　题：Mixed pulsed fluidized bed CFD-DEM Electrostatic effects Flow characteristics 

摘      要：Static electricity has an important effect on gas–solid fluidized bed reactor fluidization performance.In the process of fluidization,electrostatic interaction between particles will obviously accelerate particle agglomerate formation,which consequently reduces the fluidization performance.Pulsed gas flow injection is an efficient method to enhance particle mixing,thereby weakening the occurrence of particle agglomerate.In this study,the two-dimensional hybrid pulsed fluidized bed is established.The flow characteristics are studied by using the coupled CFD-DEM numerical simulation model considering electrostatic effects.Influences of different pulsed frequencies and gas flow ratios on fluidized bed fluidization performance are investigated to obtain the optimal pulsed gas flow condition.Results show that in the presence of static electricity,the bubble generation position is lower,which is conducive to the particle flow.Pulsed gas flow can increase the particle velocity and improve the diffusion ability.The bubble generation time is different at different frequencies,and the frequency of 2.5 Hz has the most obvious effect on the flow characteristics.Different gas flow ratios have significant impacts on the particle movement amplitude.When the pulse gas flow accounts for a large ratio,the particle agglomerate tends to be larger.Therefore,in order to improve the fluidization effect,the ratio of pulsed gas flow to stable gas flow should be appropriately reduced to 0.5 or less.