Abstract:
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.