离子风对静电除尘器中颗粒物脱除的影响机制研究

静电除尘器中电晕放电产生的离子风是影响颗粒迁移和沉积的重要因素，通过建立多过程耦合的静电除尘器数值模型，研究了不同极配型式静电除尘器的电场分布特性及离子风对空间流场和颗粒物脱除的影响规律。结果表明，针刺电极电场强度和离子电荷密度的最高值均略高于芒刺电极，但是芒刺电极的静电场分布更加均匀。在外加电压为60k V时，针刺电极和芒刺电极的离子风最高流速分别可达7.91m/s和4.62m/s，离子风会促进荷电颗粒向收尘极板运动，同时也会形成近壁高速区造成堆积颗粒的不均匀分布并导致二次扬尘。由此，针对不同形式静电除尘器提出了合理调整放电电极结构方法，进行离子风调控以强化颗粒物脱除。

Effects of Ionic Wind on Particle Removal in an Electrostatic Precipitator

The ionic wind generated by the corona discharge plays a pivotal role in the particle migration and deposition of the electrostatic precipitator(ESP).In this study,the electric field distribution with different electrode configurations and the effects of ionic wind on the space flow field and particle removal were thoroughly investigated by a comprehensive ESP model.The results indicated that the electric field strength and ion density of spike electrode were slightly increased compared with arista electrode,but the electrostatic field distribution of arista electrode was relatively uniform.The maximum velocity of ionic wind could reach 7.91 m/s and 4.62 m/s for spike electrode and arista electrode under the applied voltage of 60 kV,respectively.The migration of charged particles towards collection electrodes would be enhanced with the acceleration of ionic wind.Meanwhile,the high-speed zones within the near-plate region appeared,which may cause the inhomogeneous distribution of deposition particles and dust re-entrainment.A method for selecting appropriate discharge electrode according to the type of ESP was proposed to optimize ionic wind performance and enhance particle removal.