反向电场细颗粒脱除机理及实验研究  

Collection mechanism of filtration-charged fine particles in a reversed electric field:experimental research

作　　者：贾沛[1] 常玉锋 石零[2] 刘君侠[2] JIA Pei;CHANG Yufeng;SHI Ling;LIU Junxia(School of Resources and Safety Engineering,Wuhan Institute of Technology,Wuhan 430073,China;Hubei Key Laboratory of Industrial Fume&Dust Pollution Control,Jianghan University,Wuhan 430056,China)

机构地区：[1]武汉工程大学资源与安全工程学院,湖北武汉430073 [2]湖北省工业烟尘污染控制重点实验室(江汉大学),湖北武汉430056

出　　处：《热力发电》2021年第7期150-155,共6页Thermal Power Generation

基　　金：湖北省技术创新专项重大项目(2019ACA160)。

摘　　要：基于反向电场除尘原理,构建了反向电场电袋复合除尘实验装置,并实验测试了其对中位径1.49μm气溶胶颗粒的捕集性能。该实验装置由预荷电器和带反向电场的袋式除尘器组成。反向电场电袋复合技术的除尘增效机理是,在反向电场对预荷电粒子的静电斥力减缓了预荷电粒子向滤袋的运动速度,且增加了滤料附近场强。实验结果表明:过滤风速越高,反向电场电袋复合除尘器相对于常规电袋复合除尘器的增效作用越明显;当过滤风速由1.0 m/min增加到2.5 m/min,反向电场电袋复合的除尘效率相对于常规电袋复合的增效幅度由3.9%提升到11.8%,其压力损失比常规电袋复合除尘器的增加约5.0%;反向电场静电复合除尘技术能实现细颗粒物的高效控制,并能为反向电场工业应用提供技术支撑。Based on the principle of reverse electric field dust removal,an experimental device of reverse electric field filter dust removal was developed,and its capture ability on aerosol particles with median diameter of 1.49μm was tested.This experimental apparatus is composed of a conventional wire-tube particle precharger and fibrous filters in a reversed external electric field.The charging and collection processes are separated and accomplished in two stages.The main enhance mechanism of the reversed electric field is due to the rejection of charged particles by the electric field,and higher electric field strength is achieved on the filter bag.The experimental results show that,the advantage of the reversed electric field was significant at high face velocities than that of the conventional hybrid electrostatic filtration systems.When the face velocity was increased from 1.0 m/min to 2.5 m/min,the increase amplitude of collection efficiency in the reversed electric field increased from 3.9%to 11.8%,compared with that of the conventional hybrid electrostatic filtration systems.Due to the turbulence induced by the reversed electric field,the pressure drop in the reversed electric field was 5.0%higher than that in the conventional hybrid electrostatic filtration systems.The reverse electric field electrostatic hybrid dust removal technology can achieve efficient control of fine particles and provide technical support for reverse electric field’s industrial application.

关 键 词：反向电场 电袋复合 静电斥力 除尘 过滤风速 除尘增效 

分 类 号：X513[环境科学与工程—环境工程]