线板排布对静电除尘性能影响的数值模拟

为揭示电极排布对线板式电除尘器除尘性能的影响规律，基于电晕电场模型、k-ε湍流模型、Lawless电荷累积模型，建立了电除尘多物理场模拟模型，并通过改变极板间距和极线间距，分析了电场电势、风速、颗粒运动轨迹、除尘效率的变化特征。结果表明：极板间距增大降低了电势变化速率，极线间距减小导致放电极电势分布由点式转为条状，极线周围电势影响程度增强；增加极板间距或极线间距，均能减小流场内涡流范围，提高流速分布的均匀性；极板间距或极线间距减小，颗粒轨迹偏移的角度增大，除尘效率随之升高，且颗粒在电场停留的时间缩短；除尘效率与颗粒粒径呈正相关，除尘效率与极板间距或极线间距呈负相关。模拟得到的优化工况为：当极线间距为180 mm、极板间距为200 mm时，电除尘器对粒径为2.5 μm的颗粒除尘效率为98.6%。本研究通过构建新的模拟模型应用于线板式电除尘器的工况优化中，可为电除尘器结构优化设计和性能提升提供参考。

Numerical simulation of the influence of wire and plate arrangement on electrostatic precipitator performance

In order to obtain the influence law of electrode arrangement on the performance of wire-plate electrostatic precipitator, the multi physical field simulation model was established based on corona electric field model, k-ε Turbulence model and Lawless model. The variation characteristics of electric field potential, wind speed, particle trajectory and dust removal efficiency were analyzed via changing the distance between plates or lines. The results showed that the increase of polar plate spacing reduced the potential change rate, and the decrease of polar line spacing led to the change of electrode potential distribution from point to strip, and the in-fluence degree of potential around electrode was enhanced. Increasing the distance between plates or lines could reduce the eddy current range and improve the uniformity of velocity distribution. With the decrease of polar plate spacing or polar line spacing, the angle of particle trajectory offset increased, and the dust removal efficiency increased. The dust removal efficiency was positively correlated with particle size, and negatively correlated with polar plate spacing or polar line spacing. When the polar line spacing was 180mm and the polar plate spacing was 200mm, the removal efficiency of particles with the size of 2.5μm was 98.6%. The research on the arrangement of wire plate structure can provide theoretical reference for the optimization of wire plate electrostatic precipitator.