高压电选机内电晕电流和电场的分布规律

The distribution law of corona current and electric field strength in high tension separator

在电选过程中 ,分选带较短 ,物料参选时间短 ,在这很短的时间内完成荷电、放电、最终分离 ,分选带内滚筒表面附近的电晕电流和电场分布情况就起着直接的决定作用 .对电选机内电晕电流和电场分布规律进行了较深入的理论和试验研究 ,并以此为依据 ,对电选实践中如何通过调节操作参数、结构参数来改善分选效果进行了分析 .研究结果表明 :(1)电晕电极的主要作用是产生电晕电流 ,同时也产生静电场 ;电晕电流和场强随极间电压升高或极距减小而增强 ;(2 )电晕电流和场强沿接地滚筒表面呈正态分布 ;(3)静电极主要产生强静电场 ,静电极对电晕电极的电晕放电有屏蔽作用 ;(4)在分选过程中应采用高电压、大极距的操作制度和电晕 -静电复合电极结构 .

In electrostatic separation process, materials remain very short in the narrow separation area. Materials will be charged and separated in the area. The distribution of current and electric field strength in the area make a significant effect on the separation. This paper makes a deep study on the distribution of current and electric field strength, and gives an analysis on how to select the operating parameters to improve separation efficiency. Test results indicate that (1) The main effect of current electrode is to produce corona, as well as electrostatic field, discharging current and electric field strength rise along with the boost of voltage or the decrease of electrode distance; (2) Corona current and electric field strength normal distribute along the surface of ground drum; (3)The static electrode mainly produces strong electrostatic field, and makes a shielding on the corona electrode; (4) In actual separation process, we ought to select corona static composite electrode and adopt high voltage and big electrode distance.