LYU Shengnan^a，LIU Xuedong^a,b，XUAN Ying^a

(a.School of Mechanical Engineering and Rail Transit; b.Jiangsu Key Laboratory of Green Process Equipment,Changzhou University,Changzhou 213164,China)

Abstract:Discrete element method was used to simulate the variation of mixing power and torque in working process of mechanical powder mixer.Using a mechanical powder mixer with a blade diameter of 160 mm,the numerical simulation of the influence of rotating speed on torque and power was carried out to verify the accuracy of the numerical simulation.The effects of particle size,particle shape and particle distribution on stirring power and torque were simulated.The results show that when the particle filling amount is 35% and the stirring speed is 100,200,300,400 and 500 r/min,the stirring torque and power increase with the decreasing of average particle size.For particles with any particle size,the stirring power increases linearly with the increasing of rotating speed,and the variation of stirring power increases with the decreasing of particle size.Under the same particle size scale,the type of particles has little effect on the stirring torque and under the same packing height,the stirring power and torque decrease with the decreasing of sphericity.For particles with similar shape or the same shape,the stirring torque decrease with the decreasing of sphericity.

Keywords:particle size;particle shape;power;torque;discrete element method

中图分类号： TQ027.1                            文献标志码：A

文章编号：1008-5548(2022)05-0092-10

DOI:10.13732/j.issn.1008-5548.2022.05.012

收稿日期： 2022-03-02， 修回日期：2022-06-15，在线出版时间：2022-08-09 13:55。

基金项目：中国石化股份有限公司重点研发计划项目，编号：417002-2。

第一作者简介：吕圣男(1997—)，女，硕士研究生，研究方向为过程强化与装备优化。E-mail:lsn2727@163.com。

通信作者简介：刘雪东(1965—)，男，教授，博士生导师，研究方向为能源化工装备创新与优化、粉体工程设备与技术。E-mail:xdliu_65@126.com。