磁场作用下外部导磁结构对重介旋流器分选效果的影响研究

发布时间：2018-03-22 05:08

本文选题：重介旋流器　切入点：分选密度　出处：《太原理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：为了优化磁场调控重介旋流器分选密度的方法,本论文利用导磁结构施加于重介旋流器外部线圈上,进行磁场作用下导磁结构对重介旋流器分选效果的影响研究。研究了导磁结构布置于线圈上部和下部作用于重介旋流器不同位置时的介质分配规律。施加导磁结构后,较无导磁结构,溢流密度和底流密度变化趋势不变,变化幅度改变。进行了导磁结构作用于重介旋流器柱锥面、柱锥面下40mm、80mm、120mm和160mm处的粗煤泥分选试验,研究了不同电流强度时导磁结构作用于旋流器不同位置对其分选效果的影响规律。研究表明:上导磁结构作用于柱锥面和柱锥面下40mm处,电流5.0A时,能够进一步提高旋流器的分选密度。上导磁结构作用于柱锥面下160mm处,电流5A可以降低精、尾煤灰分,电流20、25、30A情况下,精、尾煤灰分又升高。设计了不同插入深度的导磁结构分别施加于线圈上部,进行导磁结构作用旋流器柱锥面时的介质分配试验,研究了不同插入深度导磁结构作用于旋流器柱锥面时的底、溢流介质密度变化趋势,较无导磁结构,其变化趋势不变,变化幅度改变。进行了不同插入深度导磁结构作用于旋流器柱锥面时粗煤泥分选试验,研究了不同插入深度导磁结构作用于旋流器柱锥面对提高其分选密度的影响规律。研究表明:当在旋流器柱锥面施加不同插入深度的上导磁结构时,电流5.0A条件下,精、尾煤灰分能够进一步升高,提高旋流器的分选密度。导磁结构插入深度为20mm时,精、尾煤灰分同时升到最大,提高了旋流器的分选密度。借助ANSYS软件的电磁场分析功能,进行了导磁结构对线圈磁场分布的影响模拟研究。我们可以知道:导磁结构对磁场有阻断的作用,这种阻断作用可以让磁感线不发散出去,磁感线集中之后可以在特定区域内产生更大的磁场力,这样就会对旋流器内重介质的运动产生影响,宏观上表现为分选密度的变化。但随着导磁结构插入深度的增加,线圈中因导磁结构的屏蔽作用,磁场作用范围变小。导磁结构插入深度20mm时,对旋流器分选密度的提高作用最明显。
[Abstract]:In order to optimize the method of adjusting the separation density of heavy medium cyclone by magnetic field, the magnetic conductivity structure is applied to the external coil of the double medium cyclone in this paper. The effect of magnetic conductivity structure on the separation effect of heavy dielectric cyclone is studied. The distribution law of medium is studied when the magnetic conduction structure is arranged in the upper part of the coil and the lower part of the coil acts on the different position of the double medium cyclone. Compared with no magnetic conductivity structure, the variation trend of overflow density and bottom current density is constant, and the amplitude of change is changed. The separation tests of coarse coal slime with magnetic conductivity structure on the cone surface of the heavy dielectric cyclone column, 40 mm below the cone surface of the column and 160mm are carried out. The influence of magnetic conductivity structure on the separation efficiency of hydrocyclone with different current intensity is studied. The results show that the upper magnetic conduction structure acts on the cone surface of the column and the 40mm under the cone surface of the column, and the current is 5.0A. Can further improve the separation density of the cyclone. The upper magnetic conduction structure acts on the 160mm under the cone of the column. The current 5A can reduce the content of the fine coal ash, and the current is 2025 ~ 30A. The magnetic conduction structure with different insertion depth was applied to the upper part of the coil, and the dielectric distribution test was carried out when the magnetic conduction structure acted on the cone of the cyclone column. The variation trend of overflow medium density is studied when the magnetic conductivity structure of different insertion depth acts on the cone surface of the hydrocyclone column, but the change trend of the overflow medium density is invariant than that of no magnetic conductivity structure. The separation test of coarse coal slime was carried out when the magnetic conductivity structure of different insertion depth acted on the cone surface of the cyclone column. The effect of different insertion depth magnetic conduction structure on the separation density of the hydrocyclone column cone is studied. The results show that when the upper magnetic conductivity structure with different insertion depth is applied on the cone surface of the cyclone column, the current is 5.0A. When the insertion depth of magnetic conduction structure is 20mm, the final and tail coal ash content rises to the maximum at the same time, which increases the separation density of cyclone. With the help of electromagnetic field analysis function of ANSYS software, the separation density of cyclone can be increased further. The effect of magnetic conduction structure on the magnetic field distribution of the coil is simulated. We can know that the magnetic field is blocked by the magnetic conduction structure, which can keep the magnetic inductance line from dispersing. After the magnetic inductance line concentration, the magnetic field force can be produced in a specific region, which will have an effect on the motion of the heavy medium in the hydrocyclone, showing the change of the separation density macroscopically, but with the increase of the insertion depth of the magnetic conductivity structure, Because of the shielding effect of the magnetic conduction structure in the coil, the magnetic field action range becomes smaller. When the magnetic conductivity structure is inserted into the depth 20mm, the effect of increasing the separation density of the hydrocyclone is most obvious.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD94;TD45

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