SO_3烟气调质对粉尘导电性能的改善机制

以塔山电厂SO3烟气调质运行实测数据为基础条件,通过分析SO3烟气调质后的除尘效率与飞灰比电阻、飞灰粒径、飞灰含湿量等理化性质,揭示SO3烟气调质对燃用高灰分劣质煤电厂除尘性能改善机制。为期一年测试结果表明:调质后比电阻降低3个数量级,2μm以下粒径粉尘比例提高了近6%,含湿量提高14%,从而提高表面导电机制,改善电除尘器电气参数,使电除尘效率由原来98.82%稳定提高至99.91%。

THE IMPROVEMENT MECHANISM OF SO_3 FLUE GAS CONDITIONING ON DUST ELECTRIC CONDUCTION

Based on data from SO3 fuel gas conditioning of flue gas purification system for Tashan Power Plant,it was analysed the electrical resistivity,surface property,physicochemical property of fly ash and dust precipitation efficiency,which revealed the dust precipitation improvement mechanism which SO3 fuel gas conditioning made on fired high ash content coal.The testing results of one year indicated that after the conditioning,the laboratory electrical resistivity of dust decreased by 3 orders of magnitude,the percent of the dust with a diameter of below 2 μm was increased by nearly 6%.The moisture content was also increased by 14%,resulting in the improvement of dust surface electric conduction mechanism,and electric parameter of ESP.The dust precipitation efficiency to ESP was increased from 98.82% to 99.91% with a steady state.