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为了寻找能够对重介质旋流器分选密度进行在线调控的方法,以适应原煤煤质的变化,研究了外加磁场对旋流器溢流管直径变径效果的可行性。采用四磁极、极性交替排列(N-S-N-S)布置于非导磁圆管的圆周方向,利用有限元分析软件ANSYS对管内磁场进行模拟,并将以磁铁矿粉为介质配置的一定密度的矿浆泵入四磁极磁场作用的非导磁管进行变径试验。由模拟结果可知,在管内圆周方向磁力分布较均匀,径向有较强的磁场梯度,磁性颗粒能均匀地吸附于管壁上。由试验结果可知,采用外加四磁极永磁体磁场,可以实现溢流管变径,达到重介质旋流器分选密度在线调控的目的。
In order to find a way to control the sorting density of heavy medium hydrocyclone, in order to adapt to the change of coal quality, the feasibility of applying external magnetic field to the diameter reducing effect of hydrocyclone overflow pipe was studied. The magnetic field in the tube was simulated by finite element analysis software ANSYS with four magnetic poles and alternate arrangement of polarity (NSNS) in the circumferential direction of the non-magnetized circular tube. A certain density of slurry pump with magnetite powder as the medium Into the four-pole magnetic field of non-magnetic tube diameter reduction test. It can be seen from the simulation results that the magnetic force distribution in the circumferential direction of the tube is more uniform and the magnetic field gradient in the radial direction is strong, and the magnetic particles can be uniformly adsorbed on the tube wall. It can be seen from the test results that the external magnetic field of the four-pole permanent magnet can realize the diameter reduction of the overflow pipe and achieve the purpose of on-line regulation of the separation density of the heavy medium cyclone.