双极预荷电装置凝并特性实验研究  

Experimental Study on Agglomeration Characteristics of Bipolar Precharger

作　　者：贾沛[1] 常玉锋 JIA Pei;CHANG Yu-feng(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,武汉430073 [2]江汉大学湖北省工业烟尘污染控制重点实验室,武汉430056

出　　处：《科学技术与工程》2021年第32期13998-14005,共8页Science Technology and Engineering

基　　金：湖北省技术创新专项重大项目(2019ACA160)。

摘　　要：为提高对微细颗粒物的捕集效率,基于横向双极静电除尘技术,开发出一种线-管式双极预荷电装置。借助COMSOL Multiphysics,采用电晕放电模块耦合湍流模块,研究其电流体动力学分布规律;搭建实验装置,测试其凝并特性。数值模拟结果表明:双极预荷电装置内同时存在生正、负电晕和产生正、负电荷,具有良好的湍流混合和凝并效果。对中位粒径为1.7μm硅微粉的凝并实验结果表明:经过预荷电装置后粉尘的粒径分布呈现明显的双峰分布;在平均场强为4~6 kV/cm,凝并效率随着外加电压的增加而提高;当外加电压超过11 kV,所有粒径区间粉尘的凝并效率均超过95%。研究结果有助于拓展横向双极静电除尘技术的应用范围,为双极静电技术的推广及工业应用提供参考。In order to improve the collection efficiency for fine particles,based on the mechanisms of bipolar transverse plate electrostatic precipitator,a wire-tube bipolar precharger was developed and designed.The electrohydrodynamic distribution of wire-tube bipolar precharger was numerical study by COMSOL Multiphysics based on the corona discharge model coupled to turbulent flow model.Then a laboratory scale wire-tube bipolar precharger was established to investigate the agglomeration characteristics under controlled operating condition.Numerical simulation results show that negative and positive corona,negative and positive space charge density,as well as explosive turbulent motion are occurred simultaneously in a single bipolar precharger,which are favorable for turbulence and electrostatic agglomeration.When the silicon powder with medium diameter of 1.7μm is used,the particle size distribution was obviously bimodal through the wire-tube bipolar precharger,and the agglomeration efficiency is increased with increasing applied voltage from 4 kV/cm to 6 kV/cm.When the applied voltage exceeds 11 kV,the agglomeration efficiencies of dust in each particle size range are more than 95%.The research results can expand the application of the bipolar transverse plate electrostatic precipitator technology,and provide a theoretical basis for the promotion of bipolar agglomeration technology and industrial applications.

关 键 词：静电凝并 双极荷电 湍流混合 凝并效率 微细颗粒物 

分 类 号：X513[环境科学与工程—环境工程]