Filter regenerating mechanism for exhaust black smoke removing system

Abstract

A filter regenerating mechanism for a reverse-cleaning regenerative exhaust black smoke removing system, wherein the air injection quantity is reduced, and the filter regenerating effect is improved to reduce a pressure loss due to the filter. Each time exhaust gas is passed through the filter for a predetermined period of time, a solenoid valve is opened for an extremely short period of time, thereby allowing compressed air to be supplied into an exhaust chamber through the solenoid valve, an air nozzle, etc. so as to flow in a direction reverse to the flow direction of exhaust gas. Particulates deposited on the wall surfaces of first passages in the filter are removed therefrom by the action of pressure waves and cleaning air stream produced upon opening of the solenoid valve, and gravitationally drop into a hopper where they are incinerated. A perforated plate having a large number of small holes is disposed between the air nozzle and an outlet surface of the filter. The perforated plate allows a stream of air jetted out from the air nozzle to be rectified and diffused through the small holes and sprayed in the form of a wide stream over the whole filter outlet surface substantially uniformly. Further, pressure waves produced upon opening of the solenoid valve are allowed to act on the whole outlet surface by the perforated plate.