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为了研究不同条件下电除尘器(ESP)内阳极振打时的二次扬尘,用相机拍摄了振打时粉尘层在阳极板上的剥离过程,并用电子低压冲击仪(ELPI)测试了ESP出口粉尘质量浓度,确定了最佳振打加速度和最佳振打粉尘层厚度.结果表明:粉尘层厚度越大,将阳极板振打干净所需的振打加速度就越小;粉尘层厚度相同时,改变振打时运行电压和收尘时运行电压都会影响振打时的二次扬尘质量浓度,并且振打时运行电压对二次扬尘质量浓度的影响明显大于收尘时运行电压对二次扬尘质量浓度的影响;在相同粉尘层厚度下,负极性电源的振打时运行电压绝对值从0增大到15 kV时,振打二次扬尘质量浓度减少了5.25 mg/m3,收尘时运行电压绝对值从20 kV增大到35 kV时,振打二次扬尘质量浓度只减少了1.44 mg/m3.综上所述,从减少振打时产生二次扬尘的角度,振打时应该保持较高的运行电压,且粉尘层厚度不宜小于4mm.“,”To investigate the collecting plate rapping reentrainment of electrostatic precipitation(ESP) and determine the best rapping acceleration and the best rapping dust layer thickness,the dust layer breaking away from the collecting plate under rapping was recorded by a camera,and the mass concentration of reentrainment was measured by ELPI.The experimental results show that the thicker dust layer requires smaller rapping acceleration.At the same dust layer,the reentrainment was influenced by the rapping voltage (mainly)and collecting voltage.The reentrainment mass concentration decreases by 5.25 mg/m3 with the increase of the rapping voltage absolute value from 0 to 15 kW,and collecting voltage absolute value from 20 kV increases to 35 kV,whereas it only decreases by 1.44 mg/m3 with the collecting voltage absolute value from 20 kV to 35 kV.A high rapping voltage and a dust layer with a thickness greater than 4 mm are required to reduce the reentrainment under rap.