置于锥部的轴向电磁场对重介旋流器分选效果的影响

为了在线调整重介旋流器二段分选密度,构建了半工业化磁调控重介旋流器分选系统,通过在旋流器锥部设置轴向电磁场,进行了固定入料悬浮液密度下介质分配试验和不同磁场特性下-3 mm粗煤泥分选试验,得到了不同磁系厚度下重介旋流器分选效果,实现了利用外加磁场在保证分选精度基本不变的前提下有效提高重介旋流器分选密度的目的。应用有限元软件ANSYS对所用磁系进行磁场特性模拟分析,初步揭示了磁场作用下提高重介旋流器分选密度的作用机理。认为轴向磁场力提高了磁系作用区域的介质浓度,径向磁场力强化了磁性颗粒向外的离心运动,综合表现为分离区悬浮液密度升高而导致的分选密度升高。在此基础上,提出了利用磁场调控分选密度在选煤厂降低介耗、提高效益及提升自动化水平中的应用前景。

Influence of an axial electromagnetic located in the conical part on dense medium cyclone separation effects

To investigate an on-line control method for manipulating the separation density of a dense medium cyclone,a semi-industrial magnetic manipulation dense medium separation system was built.With the introduction of an axial magnetic field located in the conical part of cyclone,the medium distribution test in fixed slurry density and -3 mm coarse coal slime separation test under different magnetic field characteristics had been conducted and got the separation effect under the different thickness of magnetic system,achieving the purpose of improving the separation density on the premise of basically remaining unchanged separation accuracy.Based on the simulation analysis using finite element software ANSYS,the paper preliminarily reveals the mechanism of a magnetic field improving the separation density.The result shows that the axial magnetic force increases the magnetic particles concentration,simultaneously,the radial magnetic force strengthens the magnetic particles outward centrifugal motion,and ultimately for the performance of separation density increase.On this basis,the application prospect of the separation density magnetic manipulation method was put forward for medium consumption reduction,economic benefit improvement and system automation.