Applications of Fuzzy-PID to the firing process control system of high-temperature shuttle kiln for zirconia-alumina products

We present a system to control the temperature in the firing process of zirconia-alumina products by applying Fuzzy-PID control algorithm. The feasibility and rationality of the application of Fuzzy-PID technique into the control system for firing process of the products is verified by analyzing the parameters of the system based on the simulation results from Matlab. A single-chip microcomputer STC89C52 is the core of the system. Onsite temperature measured by B-type thermocouples are converted to DC signal in a range from 0 to 10 V by using an AD620. After quantization via TLC2543, the digital signal is transferred to the corresponding temperature value through STC89C52.The control variables are generated by Fuzzy-PID algorithm, which is converted to DC current signals varying from 4 to 20 mA by using DAC0832. By adjusting the opening of electric control valve, the high velocity isothermal burners WT-100 is controlled. As a result, the temperature of the high-temperature shuttle kiln is stabilized. This system was applied to the gas-fired high-temperature shuttle kiln with a length of 8.6 m in 2012 in Shennan Special Refractory Factory in Gongyi, and the qualification rate of the products was enhanced from 92% to 98%.