Numerical investigation of particle re-entrainment mechanism and its suppression strategy in the high-temperature electrostatic precipitator.

An integrated model was developed to investigate the effect of temperature on the particle re-entrainment in a high-temperature electrostatic precipitator (ESP). The numerical model considered the electric field, flow field, particle migration, and particle re-suspension due to the rupture of static equilibrium. The electric and flow field distributions at different temperatures were investigated. The minimum critical shear velocity needed to detach high-temperature deposited particles from the plate surface was calculated and discussed. On these basis, five types of ESPs with collection plates of different configurations were compared. The results show that high temperatures will exacerbate particle re-entrainment caused by airflow scouring and electrostatic lifting by enhancing the ionic wind and reducing particle resistivity. The hole-type plate may be a better plate form to reduce re-entrainment in the high-temperature ESPs, as it creates a low velocity, low electric field region in the near-plate region. [Display omitted] • A modified high-temperature ESP model involving particle re-entrainment was developed • The effect of temperature on the electric and flow field was investigated numerically. • The effect of temperature on the particle re-entrainment was evaluated. • The effectiveness of different types of collection electrodes in reducing particle re-entrainment was evaluated. [ABSTRACT FROM AUTHOR]