微细粉尘在静电除尘器中的运动状态分析

为了分析线板静电除尘器中的电流体动力学过程,利用FEMLAB软件对电势泊松方程和电流连续性方程进行联立耦合求解,得到线板放电过程中电场强度分布,估算电晕外区不同粒径粉尘所受到的电场力;利用Fluent软件采用动力风模拟离子风的方法计算放电通道的流场分布,得到空间速度分布图,并分析了气流扰动对颗粒物的运动状态的影响。结果表明:利用动力风模拟离子风流场的分布符合放电环境下离子风的形成过程,该方法可以简化复杂的电流体问题。不同粒径粉尘在电场空间中的运动受到的电场力、离子风力随粒径大小不同而变化很大。研究结果对静电除尘器的改造和设计有很重要的指导意义。

THE ANALYSIS OF FINE DUST MOTION IN ELECTROSTATIC PRECIPITATOR

Potential poisson equation and current continuity equation are coupled solution by FEMLAB software,using the distribution of electric field strength in wire-plan discharge space to estimate the electric field force on different size dust outside corona zone;the distribution of air flowing in discharge channel is simulated by Fluent software.In the process of simulating,the ion wind is instead of the dynamic wind.The velocity distribution in space is obtained.to analyze the effect of the air flowing on dust motion.The results show that the simulated conclusion of using dynamic wind is fully consistent with the formation of ion wind in discharge space,which can simplify the complex current body.Electric field force and ion wind force act on different size dust are different,when they are moving in discharge space.This research can provide very important guidance to the transformation and the design of ESP.