化工进展2017，Vol.36Issue(6)：2070-2077,8.DOI:10.16085/j.issn.1000-6613.2017.06.015
埋管流化床内湿颗粒流动及混合特性的CFD-DEM数值模拟
CFD-DEM simulation of wet particles flow and mixing behavior in fluidized bed with immersed tubes
摘要
Abstract
Gas-solid fluidized beds with the presence of some liquid droplets are applied widely in industry. Due to the existence of droplets,particles become wet and viscous,which makes fluidization significantly different with dry particles. In this paper,a hysteresis contact model is applied to consider energy dissipation of lubrication force and liquid bridge force during wet particle collision,which is coupled with CFD-DEM model. The fluidization and mixing characteristics of wet particles under different conditions in a 2D fluidized bed with immersed tubes are compared. Generally,it is found that with the presence of liquid,the particles begin to agglomerate and the bubbles become gas channels. The immersed tubes play the part of frameworks,promoting the formation of gas channels. With increasing cohesiveness,the particle velocity decreases generally and the internal recirculation of wet particles is restrained. It is also found that with an increase in the cohesiveness,the pressure drop of the fluidized bed and the mixing speed of particles decrease.关键词
湿颗粒流化/迟滞碰撞模型/颗粒聚团/颗粒混合Key words
wet particle/hysteresis contact model/agglomerate/solid mixing分类
化学化工引用本文复制引用
刘道银,宋诚骁,王铮,马吉亮,陈晓平..埋管流化床内湿颗粒流动及混合特性的CFD-DEM数值模拟[J].化工进展,2017,36(6):2070-2077,8.基金项目
国家自然科学基金项目(51306035,51676042). （51306035,51676042）
