Significance of ionic wind propulsion on charged particle removal during flue gas purification

Abstract

Ionic wind propulsion plays a vital role in charged particle transport during flue gas purification, which is closely related to high-efficiency particulate removal. Here, we establish a comprehensive model to investigate the effect of ionic wind on the transport and deposition of charged particles. The high-speed ionic wind disturbs the space flow field in a meaningful way, which also causes the formation of ‘U'-shaped high-speed zones within the near-plate region. After the dusty flue gas enters the electrostatic field, due to the disturbance of high-speed ionic wind, apart from the electric force, particle transportation is acted by ionic wind propulsion. Charged particles can be significantly accelerated with ionic wind propulsion, while it also introduces an uneven distribution of deposited particles. Based on these findings, a novel electrostatic precipitator is proposed to optimize the space flow field, and the collection efficiency and dust layer shape are both significantly improved.