Apparatus for purifying a raw gas or suspended solid particles

Claim 1

IN AN APPARATUS FOR PURIFYING A RAW CARRIER GAS OF SOLID PARTICLES SUSPENDED IN SAID GAS, THE APPARATUS INCLUDING A HOUSING DEFINING A FILTERING CHAMBER THEREIN, A LAYER OF PARTICULTATE FILERING MEDIUM DIVIDING SAID CHAMBER INTO A FIRST COMPARTMENT AND A SECOND COMPARTMENT A CENTRIFUGAL SEPARATOR, A CONDUIT CONNECTING SAID SEPARATOR TO SAID FIRST COMPARTMENT A SOURCE OF SAID RAW CARRIERR GAS, FIRST CONNECTING MEANS CONNECTING SAID SOURCE WITH SAID SEPARATOR, A SOURCE OF PURGING GAS TO SAID SECOND COMPARTMENT, AND DISCHARGE MEANS FOR DISCHARGING PURIFIED GAS FROM SAID SECOND COMPARTMENT, THE DISCHARGING PURIFIED GAS FROM SAID SECOND COMPARTMENT, THE IMPROVEMENT WHICH COMPRISES: AN AUXILIARY CIRCUIT PROVIDING A FLOW PATH FROM SAID SEPARATOR TO SAID SOURCE OF SAID CARRIER GAS SEPARATE FROM SAID FIRST CONNECTING MEANS, SAID AUXILIARY CIRCUIT INCLUDING A. AN AUXILIARY DUCT COLLECTOR, B. CONVEYING MEANS FOR CONVEYING GAS FROM SAID CENTRIFUGAL SEPARATOR THROUGH SAID AUXIARY CIRCUIT AND SAID AUXILIARY DUST COLLECTOR TO SAID SOURCE OF SAID RAW CARRIER GAS, C. PRESSURE SENSING MEANS IN SAID FIRST CONNECTING MEANS FOR SENSING THE GAS PRESSURE PREVAILING IN SAID FIRST CONNECTING MEANS, D. CONTROL VALVE IN SAID AUXILIARY INTERMEDIATE SAID SEPARATOR AND SAID SOURCE OF RAW GAS FOR CONTROLLING FLOW OF GAS IN SAID PATH, AND E. VALVE OPERATING MEANS CONNECTED TO SAID SENSING MEANS AND TO SAID CONTROL VALVE FOR OPERATING SAID CONTROL VALVE IN RESPONSE TO A CHANGE IN THE PRESSURE SENSED BY THE SENSING MEANS.