GAS CGARGING MEANS AND METHOD OF REDUCING WIDTH OF DISCHARGING CURRENT OF THE MEANS

摘要

A gas ioniser unit having two coaxially arranged electrodes (27, 50) for generating a highly intensive electrical field (56) transversely through the flow path (arrow) of a gas loaded with solid particles is arranged upstream of an electrostatic particle precipitator. The ioniser anode is formed by a Venturi diffuser (27) through which the gas flows immediately prior to its entry into the particle precipitator. The ioniser cathode is formed by a disc-shaped discharge electrode (50) which is mounted coaxially in the taper of the Venturi diffuser (27) and has a rounded edge. A source of high voltage located between the Venturi diffuser and the discharge electrode causes a corona in the annular region between the edge of the discharge electrode (50) and the cylindrical inner surface (52) of the Venturi diffuser surrounding said discharge electrode. Focusing electrodes (53, 54) at cathode potential are provided on both sides of the discharge electrode, in order to reinforce the electrical field (56) between the said inner surface of the Venturi diffuser and the discharge electrode. As a result, the width of the surface, of the discharge electrode (50), which is subjected to the corona flow and on which particles can settle, is reduced, thus making the cleaning of the discharge electrode (50) easier.