【摘要】：由于礦石品位日趨貧化,采礦和選礦規(guī)模不斷增加,建材、化工等行業(yè)的迅猛發(fā)展,物料的破磨量日益增大,粒度要求也越來越高,這對粉磨設(shè)備提出了更高要求。塔式磨機(jī)以其結(jié)構(gòu)簡單,研磨效率高、能耗低的特點越來越受到廣泛關(guān)注,但是由于塔式磨機(jī)內(nèi)部研磨介質(zhì)和物料數(shù)量多、運動復(fù)雜,目前對于塔式磨機(jī)內(nèi)的顆粒行為研究尚不完善。對此,本文基于離散元方法,對塔式磨機(jī)內(nèi)顆粒運動和相互作用進(jìn)行了數(shù)值模擬,并根據(jù)結(jié)果對塔式磨機(jī)關(guān)鍵參數(shù)進(jìn)行優(yōu)化,以提高磨機(jī)的工作性能。為了研究塔式磨機(jī)攪拌槽內(nèi)顆粒的運動狀態(tài),對攪拌槽內(nèi)的研磨介質(zhì)進(jìn)行了運動和受力分析�；谫|(zhì)量守恒和能量守恒定理,建立了描述物料粉碎過程的數(shù)學(xué)模型。以JM-200塔式磨機(jī)為研究對象,利用EDEM軟件建立了塔式磨機(jī)的數(shù)值模型。根據(jù)仿真結(jié)果,判定了顆粒系統(tǒng)在塔式磨機(jī)工作過程中呈穩(wěn)定狀態(tài),分析了攪拌槽內(nèi)顆粒在徑向位置和高度位置上速度和接觸力的分布規(guī)律。研究了塔式磨機(jī)的主要參數(shù),并分析了這些參數(shù)對磨機(jī)工作性能的影響。選取攪拌器的直徑、轉(zhuǎn)速、螺旋升角、介質(zhì)填充率四個關(guān)鍵參數(shù),按正交實驗設(shè)計方法安排了四因素三水平仿真實驗,并確定介質(zhì)間法向接觸力和單位質(zhì)量功率為實驗指標(biāo),對實驗結(jié)果進(jìn)行了極差分析和綜合分析。得到了不同實驗指標(biāo)下攪拌器直徑、轉(zhuǎn)速、螺旋升角、介質(zhì)填充率對實驗結(jié)果的影響規(guī)律以及較優(yōu)參數(shù)組合。
[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.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD453

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本文編號：2253839