The error of the furnace temperature of high temperature electric furnace to the given temperature can automatically switch on or off the heat source energy supplied to the resistance furnace, or continuously change the heat source energy, so as to stabilize the furnace temperature and have a given temperature range, so as to meet the needs of heat treatment process. There are two position, three position, share, share integral and share integral differential. The temperature control of resistance furnace is such a reaction conditioning process. Compared with the practice of furnace temperature, the temperature of high-temperature furnace is required to get the error. After the error processing, the control signal is obtained to regulate the thermal power of the resistance furnace, and then the furnace temperature is controlled.
1) According to the share of error, integral and differential control effect (PID control), is the most widely used form of process control.
2) Two position conditioning - it has only two states of opening and closing. When the temperature of high temperature furnace is lower than the given value of limit, the actuator is fully opened; when the furnace temperature is higher than the given value, the actuator is fully closed. The actuator is usually contactor.
3) Three position conditioning - it has two set values of upper and lower limits. When the furnace temperature of high temperature furnace is lower than the lower limit, the contactor is fully open; when the furnace temperature is between the upper and lower limits, the actuator is partially open; when the furnace temperature exceeds the upper limit, the actuator is fully closed. If the tubular heater is a heating element, three position conditioning can be used to complete the difference between heating and heat preservation power.
On 2018-08-08 11:45:46
