线板式电除尘性能影响因素的研究

Research on influencing factors of wire plate electrostatic precipitator performance

基于电晕放电与流体动力学原理,使用COMSOL软件搭建了多物理场耦合模型,对二维线板式电除尘模型进行数值模拟,探究电极电压、颗粒粒径、入口风速、间距对电除尘性能的影响。研究结果表明:提高电极电压增大了电势梯度变化值,提高了除尘效率;粒径增大,颗粒受到的电场力明显提高,除尘效率增大;较低的入口风速有助于颗粒的捕集;极板、极线间距的增大会降低除尘效率。基于本实验模型,在电压为45 kV、粒径为2.5?m、风速为1.0 m/s、板间距为250 mm的工况下,电除尘具有较高的颗粒捕集效率。通过研究各参数对电除尘性能的影响趋势,可为电除尘器满足超低排放改造要求提供合理化建议。

Based on the principles of corona discharge and fluid dynamics,a coupled multi-physics field model was built using COMSOL software to numerically simulate a two-dimensional wire-plate type electric dedusting model to investigate the effects of electrode voltage,particle size,inlet air velocity and spacing on the performance of electric dedusting. The results show that increasing electrode voltage increases the change value of potential gradient and improves the efficiency of dust removal. With the increase of particle size,the electric field force on particles is obviously improved,and the dust removal efficiency is increased. Lower inlet wind speed is conducive to particle trapping;The increase of the distance between plate and pole will reduce the dust removal efficiency. Based on the experimental model,when the voltage is 45 kV,the particle size is 2.5 ?m,the wind speed is 1.0 m/s,and the plate spacing is 250mm,the dust removal efficiency is higher. To study the trend of the influence of each parameter on the performance of electrostatic precipitator,and to provide rationalized suggestions for the electrostatic precipitator to meet the requirements of ultra-low emission retrofit.