新型煤泥分级机的EDEM仿真与工业化试验研究

发布时间：2018-05-10 23:12

本文选题：新型煤泥分级机 + 分级　；参考：《太原理工大学》2015年硕士论文

【摘要】：分级是矿物加工工程中必不可少的环节，分级设备的选取是实现分级的前提。本文以课题组前人提出的设计理念为基础，加工出了半工业设备——新型煤泥分级机，该分级机采用动、静环组成的筛网，可以有效限制跑粗，同时能避免筛网的堵塞。本文简要地分析了新型煤泥分级机的分级机理，并建立了简化的新型煤泥分级机模型，采用离散元分析软件——EDEM对其进行了仿真模拟研究。同时在屯兰选煤厂对影响新型煤泥分级机性能的操作参数进行了研究，确定了不同参数对其影响规律，并对该设备的分级效果进行了评价，此外还与现场分级旋流器的分级性能进行了对比。通过EDEM仿真模拟研究，发现：颗粒在新型煤泥分级机内的运动是及其复杂的；动环的运动有助于避免筛网的堵塞；螺旋辊的转速是影响新型煤泥分级机分级性能的重要因素。同时得到了模拟的分级效率，最高为84.05%。通过新型煤泥分级机的工业试验研究，结果表明：随着入料流量的增大，新型煤泥分级机的分级效率降低。入料流量较大时，煤泥水通过筒状筛面的时间短，导致煤泥来不及分级，众多0.2mm的物料随着螺旋叶片的轴向推力从粗煤泥出口排出，筛分效率降低；螺旋辊转速是影响新型煤泥分级机工作性能的一个重要因素，随着转速的提高，分级效率先增大后减小。过高的转速增大了细粒级物料的错配率，，本文中螺旋辊转速为61rpm（频率为30Hz）时，分级效率最佳；随着入料浓度的增加，细粒级进入筛上物的量整体呈上升趋势，分级效率降低。浓度太高，颗粒间会容易粘结成团，分级效果变差，入料浓度过小，设备对干物料的处理量减小，应根据实际情况选择一个合适的浓度范围。本试验中当入料浓度为101.95g/L时，新型煤泥分级机分级效率最高。新型煤泥分级机具有一定的浓缩作用，一定的转速下，当入料流量越小时，浓缩效果越好，此时，脱泥降灰效果也越好。在一定的操作参数条件下，新型煤泥分级机的分级性能优于现场分级旋流器。
[Abstract]:Classification is an essential link in mineral processing engineering, and the selection of classification equipment is the premise of classification. On the basis of the design idea put forward by our predecessors, a new type of coal slime classifier, a semi-industrial equipment, has been developed in this paper. The new type of coal slime classifier, which is composed of moving and static rings, can effectively limit the thickness of the slime and avoid the clogging of the screen at the same time. In this paper, the classification mechanism of the new type coal slime classifier is briefly analyzed, and the simplified model of the new coal slime classifier is established. The simulation study is carried out by using the discrete element analysis software-EDEM. At the same time, the operating parameters affecting the performance of the new type coal slime classifier are studied in Tunlan Coal preparation Plant, and the influence law of different parameters is determined, and the classification effect of the equipment is evaluated. In addition, the classification performance of the hydrocyclone is compared with that of the field classifier. Through EDEM simulation, it is found that the movement of particles in the new type coal slime classifier is extremely complex, the movement of the moving ring helps to avoid the clogging of the screen, and the rotation speed of the spiral roller is an important factor affecting the classification performance of the new type coal slime classifier. At the same time, the classification efficiency of the simulation is obtained, the highest is 84.05. Through the industrial test of the new type coal slime classifier, the results show that the classification efficiency of the new type coal slime classifier decreases with the increase of the feed flow rate. When the feed flow is larger, the time of coal slurry passing through the cylindrical sieve surface is short, which leads to the slime too late to be classified, and many 0.2mm materials are discharged from the coarse slime outlet with the axial thrust of the spiral blade, and the screening efficiency decreases. The rotating speed of the spiral roller is an important factor affecting the performance of the new coal slime classifier. With the increase of the speed, the classification efficiency increases first and then decreases. Too high rotational speed increases the mismatch rate of fine grained material. In this paper, when the rotation speed of spiral roller is 61 rpm (frequency is 30 Hz), the classification efficiency is the best, and with the increase of feed concentration, the quantity of fine grain entering into the sieve is on the whole rising, and the classification efficiency decreases. If the concentration is too high, it will be easy to bond and form a mass between the particles, the classification effect will become worse, the feed concentration will be too small, and the treatment capacity of dry material will be reduced by the equipment. Therefore, a suitable concentration range should be selected according to the actual situation. In this experiment, when the feed concentration is 101.95g/L, the classification efficiency of the new coal slime classifier is the highest. The new coal slime classifier has a certain concentration effect. At a certain speed, the smaller the feed flow rate, the better the thickening effect is, and the better the desilting and ash reduction effect is. Under certain operating parameters, the classification performance of the new coal slime classifier is superior to that of the field classifier.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD94

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