Effect of the EHD Flow on Particle Surface Charging and the Collection Efficiency of Submicron and Ultrafine Dust Particles in Wire-plate Type Electrostatic Precipitators

Abstract

In this work, the effect of electrohydrodynamic (EHD) secondary flow on the wire-plate type electrostatic precipitator partial collection efficiencies for submicron and ultrafine dust particles in the range from 0.01 μm to 10 μm have been calculated based on the cross-sectional averaged values of numerically obtained ion density, electric field and gas velocity and coupled together with particle surface charge models based on the modified diffusion and field particle charging rates. The results show that the particle surface charge of particles between 0.01 μm and 1 μm are not significantly influenced by EHD secondary flow, however, EHD flow do perturbing the local surface charge and local particle collection efficiency. The net effect on the partial collection efficiency is not significant for the submicron size particle range.