电除尘器内部流动特性的数值模拟  

Numerical Simulation of Internal Flow Characteristics of Electrostatic Precipitator

作　　者：裴艺凯 杨振民[1] 黄超[1] 孙岩 王佳豪 PEI Yi-kai;YANG Zhen-min;HUANG Chao;SUN Yan;WANG Jia-hao(School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]河北工业大学能源与环境工程学院

出　　处：《应用能源技术》2019年第11期21-26,共6页Applied Energy Technology

基　　金：河北省基础研究计划项目(E2018202333);河北省自然科学基金(E2017202250)

摘　　要：针对电除尘器内部流场运动规律,采用基于有限元法的COMSOL软件对电除尘器三维模型进行数值模拟,分析了主流速度和电流体动力学(EHD)流对电除尘器内部流场的影响。通过泊松方程与电流连续性方程耦合模拟电晕放电,采用稳态不可压缩Navier-Stokes方程和标准k-湍流模型求解气流流动,运用流体流动粒子追踪模块模拟粒子运动轨迹。结果表明:随着通道入口流速的增大,二次EHD流影响逐渐减小,主流流速达到1 m/s时,EHD流影响消失,主流速度占据主导地位;对于1μm粒径的粒子,随着入口流速从0.3 m/s提升到1 m/s,收集效率由48%降低到15%;有无EHD流对于粒径小于10μm粒子收集效率的影响可忽略不计。Aiming at the internal flow field motion law of electrostatic precipitator,the three-dimensional model of electrostatic precipitator is numerically simulated by COMSOL software based on finite element method.The influence of mainstream speed and electro hydrodynamics(EHD)flow on the internal flow field of electrostatic precipitator is analyzed.The Poisson equation is coupled with the current continuity equation to simulate the corona discharge.The steady-state incompressible Navier-Stokes equation and the standard k-turbulence model are used to solve the airflow.The fluid flow particle tracking module is used to simulate the particle motion trajectory.The results show that with the increase of the inlet velocity of the channel,the influence of the secondary EHD flow is gradually reduced.When the mainstream flow velocity reaches 1m/s,the influence of EHD flow disappears and the mainstream speed dominates.For particles with a particle size of 1μm,the collection efficiency is reduced from 48%to 15%as the inlet flow rate is increased from 0.3 m/s to 1 m/s;the presence or absence of EHD flow is negligible for particle collection efficiency of less than 10μm particle size.

关 键 词：静电除尘器 电流体动力学 收集效率 粒子运动 数值模拟 

分 类 号：TK223.27[动力工程及工程热物理—动力机械及工程]