电除尘器离子浓度的分布

在静电除尘器中,粒子的荷电模型已经确立,电场和其中的离子浓度影响着粉尘的运动、荷电和沉降.实验利用线板式电除尘模型的一个通道,改变施加在电晕极线的电压值和测量点的位置,利用离子浓度测试仪测量收尘极板处离子的浓度,并对离子浓度的分布进行研究,发现当电压升到25 kV以后,离子浓度上升趋势趋于平缓,离子浓度在1013 m-3的数量级.在相同的电压下,收尘极板上正对电晕线A点的离子浓度都是最大的,离子浓度随距A点距离的增大而减小.

Ion Concentration of Distribution in Electrostatic Precipitator

The particles charged model has been established in electrostatic precipitators(ESP).Electric field strength and ion concentration in electrical field affect dust particle chargement,movement and sedimentation.Tunnel of wire-to-plate type ESP was used in the experiment with no gas inlet in laboratory.The voltage imposed on the corona electrode and the space between two collection electrodes were changed to measure ion concentration near the collection electrode.Analysis of ion concentration distribution was made to provided a useful reference in the ESP design.The result was obtained that the ion concentration distribution was increased flatly when the voltage>25 kV and ion concentration was in the magnitude of 1013 m-3.At the same voltage,ion concentration of A point ringt to collection electrodes had maximal value and it was decreased with the distance far from A point.