基于离散元法的塔磨机筒体高径比研究  

Study on Ratio of Height to Diameter of Tower Mill Based on Discrete Element Method

作　　者：邹德芳 刘子涵 曲迪 路社斌 于文达[1] ZOU Defang;LIU Zihan;QU Di;LU Shebin;YU Wenda(School of Mechanical Engineering,Shenyang Jianzhu University,Shenyang 110168,China;Northern Heavy Industry Fuller(Shenyang)Mining Co.,Ltd.,Shenyang 110027,China)

机构地区：[1]沈阳建筑大学机械工程学院,沈阳110168 [2]北方重工富勒(沈阳)矿业有限公司,沈阳110027

出　　处：《有色金属（选矿部分）》2024年第7期119-125,共7页Nonferrous Metals（Mineral Processing Section）

基　　金：辽宁省教育厅高校基本科研项目-面上项目(JYTMS202320231604)。

摘　　要：随着工业上的塔磨机型号种类日益增多,工业塔磨机筒体容积增大应增加其直径还是高度成为了目前待解决的问题,但目前对塔磨机筒体参数研究多为单一变量的研究。为了探究塔磨机筒体高径比的改变对其工作性能的影响,利用了离散单元法对试验塔磨机的粉磨过程进行了模拟仿真,得到了塔磨机内介质球的运动轨迹与搅拌器转矩数值,并通过试验测试出所需真实转矩数值,对仿真结果进行了验证,证明了仿真结果准确可靠。利用离散单元法对塔磨机筒体容积和搅拌器尖端线速度相同时但筒体高径比不同的塔磨机粉磨过程进行了仿真,得到了介质球的运动速度、受力情况、碰撞情况、能量利用率和搅拌器所受转矩、磨损、所需功率的变化规律。结果表明,随着筒体高径比增加,介质球速度、碰撞次数、碰撞能、能量利用率随之减小,但法向力和切向力随之增大,搅拌器所受转矩随之减小,但磨损和功率随之增大。由此可见,塔磨机筒体高径比增大,可以减小单次搅拌所需转矩并且增加介质球碰撞产生粉磨作用的力,但不利于塔磨机长期工作;塔磨机筒体高径比减小,其能量利用率更高并且利于长期使用,但单次所需转矩较大,对电机和搅拌器有更高的要求。以上研究成果对工业塔磨机筒体的设计有着一定的指导作用。With the increasing variety of tower mill models in industry,the question of whether to increase the diameter or height of the industrial tower mill cylinder when increasing its volume has become an unresolved issue.However,currently,research on the parameters of tower mill cylinder is mostly focused on a single variable.In order to investigate the impact of changes in the height to diameter ratio of the tower mill cylinder on its working performance,the discrete element method was used to simulate the grinding process of the experimental tower mill.The motion trajectory of the medium ball in the mill and the torque value of the stirrer were obtained.The actual required torque value was tested through experiments,and the simulation results were verified,proving the accuracy and reliability of the simulation results.The discrete element method was used to simulate the grinding process of a tower mill with the same cylinder volume and the same linear velocity of the agitator tip,but different height to diameter ratios of the cylinder.The movement speed,force distribution,collision situation,energy utilization rate,and changes in torque,wear,and required power of the agitator were obtained for the medium balls.Analysis shows that as the height to diameter ratio of the cylinder increases,the velocity,number of collisions,collision energy,and energy utilization rate of the medium balls decrease,but the normal and tangential forces increase,and the torque on the mixer decreases,but wear and power increase.From this,it can be seen that an increase in the height to diameter ratio of the tower mill cylinder can reduce the torque required for a single stirring and increase the force of the grinding effect caused by the collision of medium balls,but it is not conducive to the long-term operation of the tower mill.The reduction in the height to diameter ratio of the tower mill cylinder can result in higher energy utilization and favorable long-term use.However,the torque required for a single operation would be higher,which

关 键 词：离散单元法 塔磨机 高径比 仿真分析 

分 类 号：TD453[矿业工程—矿山机电]