Blower type cleaning for heat exchanging apparatus

Claim 1

IN A HEAT EXCHANGING APPARATUS PRODUCING STEAM HAVING A PLURALITY OF REMOTELY ACTUABLE SOOT BLOWERS ADAPTED TO CLEAN THE HEAT ABSORPTION SURFACES THEREOF, THE COMBINATION INCLUDING A CONTROL SYSTEM FOR PROVIDING AUTOMATIC SEQUENTIAL OPERATION OF THE SOOT BLOWERS IN RESPONSE TO THE CLEANLINESS OF THE HEAT ABSORPTION SURFACES AS INDICATED BY THE TEMPERATURE OF THE FINAL STEAM, SAID CONTROL SYSTEM COMPRISING SENSING MEANS FOR SENSING THE TEMPERATURE OF THE FINAL STEAM, CONTROL MEANS FOR SUCCESSFULLY OPERATING THE SOOT BLOWERS IN A CYCLE HAVING A PRESELECTED SEQUENCE WHEN ENERGIZED, MEANS RESPONSIVE TO SAID SENSING MEANS FOR ALTERNATELY DEENERGIZING AND ENERGIZING SAID CONTROL MEANS TO INTERRUPT AND RECOMMENCE THE OPERATING CYCLE OF THE SOOT BLOWERS, TIME DELAY MEANS IN SAID CONTROL MEANS FOR PROVIDING A PRESELECTED DELAY TIME PERIOD BETWEEN THE OPERATION OF SUCCESSIVE SOOT BLOWERS, AND MEANS FOR REGULATING THE FREQUENCY OF THE OPERATING CYCLE OF THE SOOT BLOWERS WITHIN A PRESCRIBED TIME INTERVAL.