Abstract: A resistive anode for use in a corona discharge device principally in the charging stage or collecting stage of a two-stage electrostatic precipitator, or in a single stage electrostatic precipitator. The resistive anode suppresses, i.e. lessens the severity of, back corona and prevents sparkover being produced by dielectric breakdown of particle layers which normally build up on the anode. The resistive anode is formed by a conductive electrode covered with a coating of resistive material having a primary layer of at least 0.25 mm thick in which the material has a high dielectric strength, is homogeneous within specified limits and has a predetermined resistivity. A resistive anode of this construction may be employed in a variety of electrode designs including conventional wire-plate and wire-cylinder configuration, as well as in high intensity ionizers utilizing a planar discharge electrode concentrically mounted in a tubular anode.

Abstract: An electrostatic precipitator having an inner electrode extending along the axis of a tubular outer electrode. The inner electrode includes an elongated support electrode connected to a disc shaped discharge electrode having a transverse dimension larger than the transverse dimension of the support electrode. A high potential applied between the outer electrode and the support and discharge electrodes produces a relatively thin, radially and circumferentially uniform electrostatic field between the discharge electrode and the outer electrode, and a non-corona producing electric field between the support electrode and the outer electrode. A particle entrained gas is directed into the outer electrode at the discharge electrode end. The particles are charged by the thin, intense electrostatic field adjacent the discharge electrode, and are subsequently accelerated toward the outer electrode by the electric field extending between the support electrode and the outer electrode.

Abstract: A venturi increases the velocity of contaminated gases and guides the gases past a high, extremely dense electrostatic field presented perpendicular to the gas flow and extending radially outward between a central, accurately sized disc electrode and the surface of the venturi throat. Downstream, charged particles are collected by a wet scrubbing process or electrostatic precipitator.