Safety system for combustion process

Claim 1

IN A PLANT FOR PRODUCING CARBON BLACK INCLUDING A REACTOR, A CONDUIT FOR SUPPLYING AIR UNDER PRESSURE TO GAS UNDER PRESSURE TO SAID REACTOR, A VALVE IN SAID LINE, AN ELECTROSTAATIC PRECIPITATOR HAVING AN INLET AND A GAS AN ELECTRAOSTATIC PRECIPITATOR HAVING AN INLET AND A GAS OUTLET, A DAMPER IN THE PRECIPITATOR GAS OUTLET, AND A HEADER FOR CONVEYING REACTION PRODUCTS FROM SAID REACTOR TO THE INLET OF SAID PRECIPITATOR, A SAFETY SYSTEM COMPRISING A PRESSURE REGULATOR CONTROLLED BAY THE AIR PRESSURE IN SAID CONDUIT AND CONNECTED TO SAID VALVE TO REDUCE THE GAS PRESSURE IN SAID LINE IN PROPORTION TO DECREASE IN SAID AIR PRESSURE WITHIN A MARGINAL OPERATING RANGE, MEANS FOR CLOSING SAID VALVE IN SAID CONDUIT AND SAID VALVE IN SAID GAS LINE WHEN THE CONDUIT PRESSURE FALLS BELOW SAID MARGINAL OPERATING RANGE, A CONTROLLLED BY PRESSURE SAID DAMPER, A PRESSURE REGULATOR CONTROLLED BY PRESSURE IN SAID HEADER AND OPERATIVELY CONNECTED TO SAID LINKAGE TO EFFECT CLOSURE OF SAID DAMPER AS THE HEADER PRESSURE FALLS WITHIN A PREDETERMINED RANGE, A SOURCE OF PURGE GAS UNDER PRESSURE, AND MEANS FOR ADMITTING SAID PURGE GAS TO SAID PRECIPITATOR WHEN THE PRESSURE IN SAID CONDUIT FALLS BELOW SAID PREDETERMINED VALUE.