Kiln automatic control method and apparatus

Claim 1

IN THE PROCESS WHEREIN MATERIALS FLOWING IN A KILN ARE HEATED TO HIGH TEMPERATURE NECESSARY TO PRODUCTION OF A DESIRED PRODUCT, THE STEPS THAT INCLUDE FLOWING AN AIR STREAM IN COMBUSTION RELATION WITH MAIN FUEL TO PRODUCE HOT GAS FLOWING IN THE KILN TO HEAT TE MATERIALS THEREIN, EFFECTING PRIMARY AND SECONDARY PREHEATING OF AIR FORMING SAID STREAM AND PRIOR TO USE OF THE AIR FOR MAIN FUEL COMBUSTION, WHEREBY AIR TEMPERATURE FLUCTUATIONS RESULT FROM SAID PRIMARY PREHEATING, THE MATERIALS WITHIN A PREDETERMINED REGION OF THE KILN HAVING MATERIALS TEMPERATURE FLUCTUATIONS, SAID AIR AND MATERIAL TEMPERATURE FLUCTUATIONS HAVING AN ULTIMATELY ADVERSE EFFECT UPON THE HEATING OF SAID MATERIALS TO SAID HIGH TEMPERATURE, SAID SECONDARY PREHEATING BEING EFFECTED BY CUMBUSTION OF AUXILIARY FUEL FOR HEATING AIR FLOWING TO THE KILN, OBTAINING CORRECTION VALUES CORRESPONDING TO SAID AIR AND MATERIALS TEMPERATURE FLUCTATIONS, AND USING SAID VALUES TO CONTROL SAID SECONDARY PREHEATING TO COUNTER SAID ADVERSE EFFECT ON THE HEATING OF SAID MATERIALS TO SAID HIGH TEMPERATURE.