振打清灰对电除尘器排放的影响:实验基础研究  

Effects of Rapping on the Emission of Electrostatic Precipitation: Basic Experimental Research

作　　者：周靖鑫 李树然[1] 李加丰[1] 郑钦臻[1] 张连成[1] 黄逸凡[1] 刘振[1] 闫克平[1] 

机构地区：[1]浙江大学化学工程与生物工程学院工业生态与环境工程研究所,杭州310028

出　　处：《高电压技术》2017年第8期2689-2695,共7页High Voltage Engineering

基　　金：国家自然科学基金(21276232);浙江省公益基金(2014C33022)~~

摘　　要：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 k V时,振打二次扬尘质量浓度减少了5.25 mg/m^3,收尘时运行电压绝对值从20 k V增大到35 k V时,振打二次扬尘质量浓度只减少了1.44 mg/m^3。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4 mm。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 ex- perimental 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 concentra- tion decreases by 5.25 mg/m^3 with the increase of the rapping voltage absolute value from 0 to 15 kV, and collecting voltage absolute value from 20 kV increases to 35 kV, whereas it only decreases by 1.44 mg/m^3 with the collecting volt- age 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.

关 键 词：ESP 阳极振打 二次扬尘 振打加速度 粉尘层 运行电压 

分 类 号：X773[环境科学与工程—环境工程]