The error of the furnace temperature of the high-temperature electric furnace to a given temperature automatically turns on or off the heat source energy supplied to the resistance furnace, or continuously changes the size of the heat source energy to make the furnace temperature stable with a given temperature range to meet the needs of the heat disposal process. The common conditioning laws of automatic temperature control include two-position, three-digit, share, share integral and share integral differentiation.
Resistance furnace temperature control is such a reaction conditioning process, comparing the practice of furnace temperature and the need for high temperature furnace temperature to obtain errors, through the disposal of the error to obtain the control signal, to adjust the thermal power of the resistance furnace, and then complete the control of the furnace temperature.
(1) According to the share of error, integration and differentiation of the manipulation effect (PID manipulation), is a widely used form of manipulation in process control.
(2) Two-position conditioning - it only has two states: open and closed, and the actuator is fully open when the temperature of the high-temperature furnace is lower than the given value of the limit; When the furnace temperature is higher than the given value, the actuator is completely closed. Actuators are usually contactors.
(3) Three-dimensional conditioning - it has two given values of upper and lower limits, and the contactor is fully open when the temperature of the high-temperature furnace is lower than the given value of the lower limit; When the furnace temperature is between the given values of the upper and lower limits, the actuator is partially open; When the furnace temperature of the high-temperature furnace exceeds the upper limit and the given value, the actuator is completely closed. If the tubular heater is a heating element, the difference between heating and insulation power can be completed by three-dimensional conditioning.
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