Patent ID: 6056797
Filing Date: 2000-05-02
Classification: B01D

Abstract:
A dust collector filter cleaning control system comprising a dust collector, including a housing having an opening for the admission of particulate-laden gases conveyed thereto by a normal on-line air flow fan and an outlet for conveying clean gases therefrom, a plurality of filters having outer surfaces mounted in said housing for collecting particles on the outer surfaces thereof from the incoming particulate-laden gases, said plurality of filters being arranged in rows, a cleaning system for removing said particles from said surfaces, said cleaning system comprising a high-pressure compressed air line, a valve at each row of said filters communicating with said high-pressure compressed air line, an actuator connected to each valve, a timer being operatively connected to said actuator for opening and closing said valve for applying a periodic pulsed firing of high-pressure compressed air jets against the filters to thereby remove particles from the outer surfaces thereof, and a control system to prevent particles from returning to the filters after a high-pressure pulse of compressed air jets, said control system comprising a bypass line communicating with said high-pressure compressed air line, a source of low-pressure air communicating with said bypass line and the valve at each row of said filters, a switching valve mounted in said high-pressure compressed air line, an actuator connected to said switching valve, said timer operatively connected to the actuator for said switching valve, whereby during a brief period after one or more high-pressure cleaning pulses, the switching valve is closed and the valve at each row of filters is open resulting in low-pressure air flowing to the filters, to thereby maintain briefly, a back pressure to the normal on-line air flow fan to prevent the return of the particles onto the surface of the filters.