用电除尘器收集低比电阻粉尘的研究

为了解决用电除尘器收集低比电阻粉尘的问题,提出用导电涂料涂敷ESP极板,使极板表面形成具有一定比电阻的涂层.讨论了普通极板和涂层极板的放电特性,分析表明,只要涂层比电阻在105Ω.cm<ρc<109Ω.cm范围内,即可用以收集低比电阻粉尘.推导出了涂层比电阻计算公式,可精确计算导电粉体在涂料中的掺入比例.利用电除尘器模型对极板有、无涂层时的收尘性能进行了实验对比,结果表明,用电除尘器收集低比电阻粉尘时,极板有涂层时的收尘效率显著高于极板无涂层时的收尘效率.

Collecting Low-Resistivity Dust with Electrostatic Precipitator

To solve the problem of collecting low-resistivity dust with ESP, a method is proposed to coat the ESP plate electrode surface with a special conductive compound so as to form a coating with a certain resistivity. Compares the coated plate electrodes with uncoated ones to discuss their discharge characteristics. The result showed that the ESP with coated plate electrode is available to collect low-resisitivity dust as long as the resistivity of the coating is between 10⁵ Ω·cm and 10⁹ Ω·cm. A formula is deduced to calculate the resistivity of the coating on the basis of the proposed mathematical model, by which the proportion of the conductive powder to be mixed in the compound can be calculated accurately. A contrast experiment was done for the dust-collection performance of ESP with and without such a coating by use of the model, and the ESP with coated surface of plate electrode is evidently superior to that with uncoated surface in dust collection efficiency.