电除尘器中离子风对除尘效果的影响

Influences of Ion Wind in Electrostatic Precipitator on Dust Removal Effect

目的研究电除尘器中离子风对除尘过程的影响。方法分析电除尘器中离子风对除尘效果的影响,建立完整的颗粒荷电模型,在Fluent软件平台上进行计算。结果离子风在电极线附近呈双螺旋结构,正对电极线位置的离子风速度最大,在远离电极线的方向上逐渐变小,越靠近电极线,速度下降的梯度越大,对流场有扰动作用,随流速增加,离子风效应被逐渐削弱。当主流速小于等于0.5 m/s时,离子风体现为增大驱进速度,颗粒更快到达极板,有利于改善除尘效率。结论电极线的偏置可以提高除尘效率,当电极线置于电场宽度方向1/4处时,可以获得最佳除尘效果。

Objective To study the effect of ionic wind on dust removal process in electrostatic precipitators. Methods Effects of ion wind in the electrostatic precipitator on the dust removal effect were analyzed. A complete particle charge model was established and calculated on the Fluent software platform. Results The ion wind had a double helix structure near the electrode line. The ion wind velocity at the opposite position of the electrode line was the largest. And it gradu-ally decreased in the direction away from the electrode line. The closer to the electrode line, the greater the gradient of the velocity drop is. The ion wind effect was gradually weakened. When the main velocity was less than or equal to 0.5 m/s, the ion wind body was to increase the drive speed, the particles reached the plate faster. It was conducive to improving the efficiency of dust. Conclusion Electrode line of the bias can improve the efficiency of dust removal. When the electrode line is in the direction of the electric field width of a quarter, the best dust removal effect could be achieved.