旋转摩擦起电器几何参数的CFD模拟研究  

CFD Simulation of Geometric Parameters of Rotary Triboelectrostatic Charger

作　　者：叶世旺[1] 陶东平 陶有俊[3,4] 黄志敏[1] 薛刘萍[1] 张雷[1] YE Shiwang;TAO Dongping;TAO Youjun;HUANG Zhimin;XUE Liuping;ZHANG Lei(School of Materials and Physics,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;School of Resources and Environmental Engineering,Shandong University of Technology,Zibo,Shandong 255000,China;School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;Key Laboratory of Coal Processing and Efficient Utilization,Ministry of Education,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)

机构地区：[1]中国矿业大学材料与物理学院,江苏徐州市221116 [2]山东理工大学资源与环境工程学院,山东淄博市255000 [3]中国矿业大学化工学院,江苏徐州市221116 [4]中国矿业大学煤炭加工与高效洁净利用教育部重点实验室,江苏徐州市221116

出　　处：《矿业研究与开发》2022年第5期179-183,共5页Mining Research and Development

基　　金：国家自然科学基金资助项目(51274200,51804302)。

摘　　要：旋转摩擦起电器是旋转摩擦电选机的核心部件,其性能很大程度上决定了静电分选机的分选效果。为探究旋转摩擦起电器几何参数对粉煤灰荷电效果的影响,采用标准k-ε湍流模型结合颗粒轨道模型,以粒径为20,40和60μm的球形碳、灰颗粒为研究对象,对所设计的8种不同摩擦起电器形状内颗粒的运动特性进行了数值模拟研究。结果表明:旋转摩擦轮截面边数为12且内凹圆弧和直线段交替分布时,不仅可显著减小颗粒在摩擦起电器右下方的堆积,而且颗粒的最大速率相比圆形摩擦轮截面的情形至少提高了3.56%,同时摩擦轮碰撞的区域面积相比圆形摩擦轮截面的情形至少提高了2倍以上,从而使碰撞摩擦更加充分,粉煤灰颗粒摩擦起电效果更好。The rotary triboelectrostatic charger is the core component of a rotary triboelectrostatic separator.Its performance determines the separation efficiency of the electrostatic separator to a great extent.In order to investigate the influence of geometric parameters of the rotary triboelectrostatic charger on the charging effect of fly ash,a standard k-εturbulence model combined with particle trajectory model was used.Then,the motion characteristics of particles with eight different designs of the rotary triboelectrostatic charger shapes were simulated by taking spherical carbon and ash particles with 20,40,60μm diameter as research objects.The results show that when the cross section of the rotary friction wheel has twelve sides and the inner concave arcs and straight line sections are alternately distributed,it can not only significantly reduce the accumulation of particles at the lower right side of the friction charger,but also increase the maximum speed rate of particles by at least 3.56%compared with the case where the cross section is circular.At the same time,the collision area between friction wheels is at least 2 times higher than that when the cross section is circular.Thus,the collision friction is more sufficient and the friction electrification effect of fly ash particles is better.

关 键 词：旋转摩擦电选机 粉煤灰 起电器形状 运动特性 

分 类 号：TD924[矿业工程—选矿]