Method and device for controlling furnace temperature of burning heating furnace

A device for controlling furnace temperature of a fired heating furnace, characterized in that, comprising:

• a thermocouple disposed adjacent to a burner, and is used for monitoring furnace temperatures, the thermocouple having an analog-to-digital converting module to output furnace temperature feedback values;
• a module for calculating a furnace temperature difference which is connected to the analog-to-digital converting module of the thermocouple, the module for calculating the furnace temperature difference saving furnace temperature setting values, and the module for calculating the furnace temperature difference calculating the differences between furnace temperature setting values and furnace temperature feedback values and set these differences as discrepancy values DV1;
• a module for calculating a gradient of furnace temperature change which is connected to the module for calculating the furnace temperature difference, it calculating and setting the differences between the furnace temperature setting values and the furnace temperature feedback values in a unit time, i.e., the gradients of furnace temperature change values, as discrepancy values DV2;
• a speed adjuster of a fired heater machine set being used for obtaining a speed V of the fired heater machine set;
• a first multiple feed forward module, connected to the speed adjuster, obtaining a first multiple feed forward output components FFV in accordance with the speed of the fired heater machine set;
• a second multiple feed forward module, connected to the module for calculating the furnace temperature difference, obtaining a second multiple feed forward output components FFT in accordance with the differences between the furnace temperature setting values and the furnace temperature feedback values, i.e., the discrepancy values DV1;
• a module for creating an adjusting control parameter, which is connected to the module for calculating the furnace temperature difference and the module for calculating the gradient of furnace temperature change, looking up a PID control parameter in accordance with the discrepancy values DV1 and DV2, based on the fuzzy control rule, and creating an adjusting control parameter OP1 in accordance with the PID control parameter;
• a flow controller, connected to the module for creating an adjusting control parameter, the first multiple feed forward module and the second multiple feed forward module, creating a final control output value by combining the adjusting control parameter OP1 with the first multiple feed forward components FFV and the second multiple feed forward components FFT;
• a valve for regulating coal gas flow, connected to the flow controller, regulating the coal gas flow in accordance with the final control output value;
• a coal gas flow detector, connected to the flow controller, detecting the current coal gas flow and feed it back;
• a valve for regulating air flow, connected to the flow controller, regulating the air flow in accordance with the final control output value;
• and
• an air flow detector, connected to the flow controller, detecting the current air flow and feed it back.