In this paper, a novel approach based on the Lagrangian particle tracking method which adopted the accumulated displacement of particles as judgment standard was proposed to investigate the particle collision mechanism under the influence of non-contact external forces in a typical wire-plate electrostatic precipitator. The accumulated displacement of different diameter particles could reflect the range of particle motion and the collision probability inside the ESP, which was obtained from the calculated trajectory coordinates of particles under the influence of Brownian force and electric force. Results showed that the electric force controlled the particle’s trajectory direction while the Brownian force only made particles fluctuate along with the main track. The binary collision models with the determination of the dominant force were developed, which can be divided into two areas respectively called the electric force dominant region and the Brownian force dominant region. The total accumulated displacement of the submicron particle presented a U-shape curve, which matched well with the grade collection efficiency of fine particles in various experiments and demonstrated the validity of the proposed method. Also, the approach had good expansibility in investigating the role of other external forces in particle collision and could provide references for the design and working condition selection of ESP.

本文提出了一种基于拉格朗日粒子跟踪方法的新方法，该方法以粒子的累积位移为判断标准，研究了典型线板静电除尘器在非接触外力作用下的粒子碰撞机理。不同直径粒子的累积位移可以反映粒子运动的范围和ESP内部的碰撞概率，这是通过在布朗力和电力的影响下计算出的粒子的轨迹坐标获得的。结果表明，电力控制粒子的轨迹方向，而布朗力仅使粒子随主轨道波动。建立了具有主导力的二元碰撞模型，该模型可分为两个区域，分别称为电力主导区域和布朗力主导区域。在各种实验中，亚微米颗粒的总累积位移呈U形曲线，与细颗粒的级数收集效率非常匹配，证明了该方法的有效性。而且，该方法在研究其他外力在粒子碰撞中的作用方面具有良好的可扩展性，可以为电除尘器的设计和工作条件选择提供参考。在各种实验中，亚微米颗粒的总累积位移呈U形曲线，与细颗粒的分级收集效率非常吻合，证明了该方法的有效性。而且，该方法在研究其他外力在粒子碰撞中的作用方面具有良好的可扩展性，可以为电除尘器的设计和工作条件选择提供参考。在各种实验中，亚微米颗粒的总累积位移呈U形曲线，与细颗粒的分级收集效率非常吻合，证明了该方法的有效性。而且，该方法在研究其他外力在粒子碰撞中的作用方面具有良好的可扩展性，可以为电除尘器的设计和工作条件选择提供参考。