圆筒混合机内不同粒径颗粒的轴向分离研究  

A study on the axial segregation of binary-size particles in a rotary drum

作　　者：廖继勇[1] 龚曙光[2] 左志坚 卢兴福[1] 刘克俭[1] LIAO Jiyong;GONG Shuguang;ZUO Zhijian;LU Xingfu;LIU Kejian(Zhongye Changtian International Engineering Co.,Ltd.,Changsha 410015,China;School of Mechanical Engineering,Xiangtan University,Xiangtan 411105,China)

机构地区：[1]中冶长天国际工程有限责任公司,湖南长沙410015 [2]湘潭大学机械工程学院,湖南湘潭411105

出　　处：《湘潭大学学报（自然科学版）》2024年第2期1-10,共10页Journal of Xiangtan University(Natural Science Edition)

基　　金：国家自然科学基金(51875493);湖南省自然科学基金(2023JJ50031);湖南省教育厅项目(22C0068)。

摘　　要：为了探讨颗粒在圆筒混合机的轴向分离机理,提出了一种由多段摩擦系数不同圆筒组成的新型圆筒混合机结构.以颗粒堆积角为参考,通过仿真与实验测试得到了颗粒的参数,并基于圆筒混合机分离实验验证了仿真模型.以此为基础,开展基于离散元法的不同粒度颗粒在圆筒混合机内分离过程的数值模拟研究,根据颗粒分布、休止角、运动速度、回转半径等分析了不同粒径颗粒在分离过程中的流动形态,并基于分离指数探讨颗粒的分离特性.结果表明:圆筒混合机侧壁摩擦系数不同将导致颗粒休止角不同,从而使不同区间颗粒的运动速度不同,高摩擦系数区域内颗粒运动快,而低摩擦系数区域内颗粒运动较慢;运动速度的不同导致颗粒在新型圆筒混合机内将产生明显的轴向分离现象,小粒径颗粒聚集在低摩擦系数区,而大粒径颗粒聚集在高摩擦系数区.A novel drum composed of multi section cylinders with different friction coefficients was proposed to discuss the axial segregation mechanism of particles in a rotary drum.The particle parameters were obtained by the simulation and experiment of stacking test,and the simulation model was verified by the segregation experiment in a rotary drum.On this basis,the numerical simulation of the segregation of binary size particles was carried out using discrete element method(DEM).The particle distribution,repose angle,particle speed and gyration radius were adopted to analyze the flow pattern of particles,and the segregation index was used to discuss the segregation performance.The results obtained indicate that the different friction coefficients of drum side wall will lead to different repose angle of particles,which results in the different particle speeds.Particles in the high friction region move faster than that in the low friction region.The difference of particle velocities results in an obvious axial segregation phenomenon for the binary size particles in the novel rotary drum.Small particles will accumulate in the low friction region while large particles will gather in the high friction region.

关 键 词：圆筒混合机 颗粒分离 离散元法 分离指数 

分 类 号：TD97[矿业工程—选矿]