逆流荷电双区ESP改善高比电阻粉尘除尘效果

为了改善ESP对含高比电阻粉尘烟气的除尘效果,对比测定了常规单、双区及逆流荷电双区三种静电除尘器模型在净化分别含有正常或高比电阻粉尘气体时的U-I特性和除尘效率.常规单、双区ESP在净化含高比电阻粉尘气体的过程中,当极间电压升高至50 kV时,收尘电场发生反电晕,且除尘效率开始下降;而逆流荷电双区ESP净化含高比电阻粉尘气体与净化含有正常比电阻粉尘的U-I特性曲线并无明显差异,两种粉尘的净化效率与极间电压之间的关系曲线也呈相同的变化态势.研究结果证实,对于净化含有高比电阻粉尘烟气,新型ESP可以避免发生反电晕,有效改善除尘效果.

Improving Collection Efficiency of the High Specific Resistance Dust by the Counter-Current Charged Dual-Zone ESP

In order to improve the purification effect of ESP on high resistivity dust in flue gas， U-I characteristics and collection efficiency of cleaning normal or high resistivity dust gas were measured in the three electrostatic precipitators test model such as ordinary single district， the conventional dual-zone and dual-zone counter-current charged . In the process of cleaning high resistivity dust gas by ordinary single district and the conventional dual-zone ESP， when the voltage rises to 50kV ， dust collection electric field occurs back corona and the collection efficiency begins to decline. While the trends of U-I characteristic curve have no significant differences when dual-zone counter-current charged ESP cleaning gas containing the high specific resistance dust and the normal specific resistance dust， and the collection efficiency and voltage show the same trends. The research results confirm that the new ESP can avoid anti-corona and improve the effects of cleaning dust effectively for the purification of flue gas containing a high resistivity dust.