双阴极静电除尘器仿真优化模型与试验验证  

Simulation optimization model and experimental verification of double cathode electrostatic precipitator

作　　者：刘云辉 杨廷方[1] 罗屹豪 刘寒遥 周西杰 LIU Yunhui;YANG Tingfang;LUO Yihao;LIU Hanyao;ZHOU Xijie(School of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha 410114,Hunan,China;Hunan Institute of Metrology and Test,Changsha 410004,Hunan,China)

机构地区：[1]长沙理工大学电气与信息工程学院,湖南长沙410114 [2]湖南省计量检测研究院,湖南长沙410004

出　　处：《烧结球团》2024年第2期123-131,共9页Sintering and Pelletizing

基　　金：国家自然科学基金资助项目(51777015)。

摘　　要：为改善线板式静电除尘器对PM_(2.5)细颗粒物存在穿透窗口问题,提高其对超细颗粒物的收集效率,本文采用有限元法分析和模拟双阴极静电除尘器内流场、电场、颗粒荷电及颗粒运动等物理场的耦合过程;使用泊松方程、偏微分方程描述电场,利用标准k-ε湍流模型描述流场,采用Lawless模型描述颗粒荷电方式,并用拉格朗日模型描述颗粒运动状态;在Comsol仿真平台上搭建双阴极除尘器模型,进行双阴极提高静电除尘效率研究。数值模拟结果表明:在同一放电极电压下,随着颗粒入射速度的升高,电致离子风对流场里的颗粒总体速度影响逐渐变弱,这使得流场里的颗粒的速度差异变小;随着辅助阴极电压的上升,不同入口速度的各种粒子到达集尘板所需的水平位移逐渐变少;当粒子入射速度为0.5 m/s时,对比无辅助极板增加辅助阴极电压至-25 kV,可以使0.1~1.0μm细颗粒物的集尘效率达到98.5%;当粒子入射速度为0.5 m/s时,在同一辅助阴极电压下,放电极电压从-20 kV增加到-25 kV,可提高0.1~1.0μm细颗粒物的集尘效率达25%。In order to improve the penetration window of PM 2.5 fine particulate matter in the line-plate electrostatic precipitator and improve its collection efficiency of ultrafine particulate matter,the finite element method is used to analyze and simulate the coupling process of the physical fields such as flow field,electric field,particle charge and particle motion in the double cathode electrostatic precipitator.The Poisson equation and partial differential equation are used to describe the electric field,the standard k-εturbulence model is used to describe the flow field,the Lawless model is used to describe the charge mode of the particles,and the Lagrangian model is used to describe the motion state of the particles.A model of a dual cathode precipitator is built on the Comsol simulation platform,and the dual cathode is studied to improve the efficiency of electrostatic precipitator.The numerical simulation results show that under the same discharge electrode voltage,with the increase of the incident velocity of the particles,the influence of the electroionic wind on the overall velocity of the particles in the flow field gradually weakens,which makes the velocity difference of the particles in the flow field smaller;with the increase of the auxiliary cathode voltage,the horizontal displacement required for various particles with different inlet velocities to reach the dust collection plate gradually decreases;when the incident velocity of the particles is 0.5 m/s,the auxiliary cathode voltage can be increased to-25 kV compared with the non-auxiliary plate,which can make the dust collection efficiency of 0.1~1.0μm fine particulate matter can reach 98.5%;When the incident velocity of particles is 0.5 m/s,the discharge electrode voltage increases from-20 kV to-25 kV under the same auxiliary cathode voltage,which can increase the dust collection efficiency of 0.1~1.0μm fine particulate matter by 25%.

关 键 词：静电除尘器 双阴极 流场 电场 细颗粒物 

分 类 号：X701.2[环境科学与工程—环境工程]