Abstract: Electrostatic forces consisting of corona electrostatic force, polarization electrostatic force, contact electrostatic force & faradic electrostatic force are of great importance to dust adhesion on the plate and collection in electrostatic precipitator.The theoretical equations for all kinds of electrostatic forces of particles from microcosmic aspect are derived by setting up a model.By simulating the electrostatic field in electrostatic precipitator, the magnitude of the electrostatic forces of dust with different applied pulse electrostatic fields are measured，and the conditions for the air re-entrainment of particles under rapping are proposed.The experiment result shows that the electrostatic forces of dust is proportional to the applied pulse electrostatic field and the dust can not be re-entrained easily because of high electrostatic forces at a great current density .It is indicated that the charging bar is also beneficial to controlling the re-entrainment of precipitated particles.

Key words: High electrostatic field, Electrostatic force, Dust, Collection, Collecting plate