基于离散元法的塔式磨机关键参数研究
发布时间：2018-10-05 15:03
【摘要】：由于矿石品位日趋贫化,采矿和选矿规模不断增加,建材、化工等行业的迅猛发展,物料的破磨量日益增大,粒度要求也越来越高,这对粉磨设备提出了更高要求。塔式磨机以其结构简单,研磨效率高、能耗低的特点越来越受到广泛关注,但是由于塔式磨机内部研磨介质和物料数量多、运动复杂,目前对于塔式磨机内的颗粒行为研究尚不完善。对此,本文基于离散元方法,对塔式磨机内颗粒运动和相互作用进行了数值模拟,并根据结果对塔式磨机关键参数进行优化,以提高磨机的工作性能。为了研究塔式磨机搅拌槽内颗粒的运动状态,对搅拌槽内的研磨介质进行了运动和受力分析。基于质量守恒和能量守恒定理,建立了描述物料粉碎过程的数学模型。以JM-200塔式磨机为研究对象,利用EDEM软件建立了塔式磨机的数值模型。根据仿真结果,判定了颗粒系统在塔式磨机工作过程中呈稳定状态,分析了搅拌槽内颗粒在径向位置和高度位置上速度和接触力的分布规律。研究了塔式磨机的主要参数,并分析了这些参数对磨机工作性能的影响。选取搅拌器的直径、转速、螺旋升角、介质填充率四个关键参数,按正交实验设计方法安排了四因素三水平仿真实验,并确定介质间法向接触力和单位质量功率为实验指标,对实验结果进行了极差分析和综合分析。得到了不同实验指标下搅拌器直径、转速、螺旋升角、介质填充率对实验结果的影响规律以及较优参数组合。
[Abstract]:Due to the increasingly poor grade of ore, the increasing scale of mining and mineral dressing, the rapid development of building materials, chemical industry and other industries, the quantity of material breaking and grinding is increasing day by day, and the requirement of particle size is becoming higher and higher, which puts forward higher requirements for grinding equipment. Tower mill has attracted more and more attention because of its simple structure, high grinding efficiency and low energy consumption. However, because of the large amount of grinding media and materials inside the tower mill, the movement is complicated. At present, the study of particle behavior in tower mill is not perfect. In this paper, based on the discrete element method, the particle motion and interaction in the tower mill are numerically simulated, and the key parameters of the tower mill are optimized according to the results, in order to improve the working performance of the tower mill. In order to study the moving state of the particles in the mixing tank of the tower mill, the motion and force of the grinding medium in the mixing tank were analyzed. Based on the conservation of mass and energy, a mathematical model is established to describe the material crushing process. Taking JM-200 tower mill as research object, the numerical model of tower mill is established by using EDEM software. According to the simulation results, the stable state of the particle system in the working process of the tower mill is determined, and the distribution of velocity and contact force of the particles in the mixing tank at the radial position and the height position is analyzed. The main parameters of tower mill are studied, and the influence of these parameters on the performance of mill is analyzed. Four key parameters of agitator, such as diameter, rotating speed, spiral rising angle and medium filling rate, are selected. Four factors and three levels of simulation experiments are arranged according to the orthogonal experimental design method, and the normal contact force and unit mass power of the medium are determined as the experimental indexes. The range analysis and comprehensive analysis of the experimental results are carried out. The influence of the diameter, rotational speed, spiral angle and medium filling ratio of the agitator on the experimental results and the optimal combination of parameters were obtained.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD453
本文编号：2253839
[Abstract]:Due to the increasingly poor grade of ore, the increasing scale of mining and mineral dressing, the rapid development of building materials, chemical industry and other industries, the quantity of material breaking and grinding is increasing day by day, and the requirement of particle size is becoming higher and higher, which puts forward higher requirements for grinding equipment. Tower mill has attracted more and more attention because of its simple structure, high grinding efficiency and low energy consumption. However, because of the large amount of grinding media and materials inside the tower mill, the movement is complicated. At present, the study of particle behavior in tower mill is not perfect. In this paper, based on the discrete element method, the particle motion and interaction in the tower mill are numerically simulated, and the key parameters of the tower mill are optimized according to the results, in order to improve the working performance of the tower mill. In order to study the moving state of the particles in the mixing tank of the tower mill, the motion and force of the grinding medium in the mixing tank were analyzed. Based on the conservation of mass and energy, a mathematical model is established to describe the material crushing process. Taking JM-200 tower mill as research object, the numerical model of tower mill is established by using EDEM software. According to the simulation results, the stable state of the particle system in the working process of the tower mill is determined, and the distribution of velocity and contact force of the particles in the mixing tank at the radial position and the height position is analyzed. The main parameters of tower mill are studied, and the influence of these parameters on the performance of mill is analyzed. Four key parameters of agitator, such as diameter, rotating speed, spiral rising angle and medium filling rate, are selected. Four factors and three levels of simulation experiments are arranged according to the orthogonal experimental design method, and the normal contact force and unit mass power of the medium are determined as the experimental indexes. The range analysis and comprehensive analysis of the experimental results are carried out. The influence of the diameter, rotational speed, spiral angle and medium filling ratio of the agitator on the experimental results and the optimal combination of parameters were obtained.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD453
【相似文献】
相关期刊论文 前9条
1 李亚平;;塔式磨机[J];建材工业信息;1988年17期
2 王翔云;;用于细磨的塔式磨机[J];建材工业信息;1991年18期
3 ;爱立许高效塔式磨机[J];矿业装备;2011年06期
4 姜迎春;黄虹;;塔式磨机在国内矿山行业使用中的最新进展[J];科技创新与应用;2014年14期
5 姚福善;;大型塔式磨机在金精矿氰化细磨中的应用[J];黄金科学技术;2014年03期
6 ;简讯[J];国外选矿快报;1997年01期
7 母福生;董方;史金东;许宝玉;;塔式磨机磨矿机理及关键参数研究[J];中国机械工程;2011年07期
8 石广;;简讯[J];国外选矿快报;1998年14期
9 ;[J];;年期
相关硕士学位论文 前1条
1 李卓;基于离散元法的塔式磨机关键参数研究[D];燕山大学;2015年
，本文编号：2253839
本文链接：https://www.wllwen.com/kejilunwen/kuangye/2253839.html
