Temperature control of a resistance furnace is crucial for maintaining the furnace temperature within a specific range. This is essential to meet the requirements of various heat treatment processes.
What is Temperature Control of Resistance Furnace? (4 Key Methods Explained)
1. Controlling I2R or V2/R Losses
One common method for temperature control in resistance furnaces is to manage the I2R or V2/R losses. This is achieved by intermittently switching the furnace voltage ON and OFF. By comparing the actual furnace temperature with the desired temperature, a deviation is obtained. This deviation is then processed to generate a control signal that adjusts the thermal power of the resistance furnace, thereby controlling the furnace temperature. This type of control is known as feedback adjustment and is commonly implemented using a proportional-integral-derivative (PID) control algorithm. PID control is widely used in process control.
2. Varying the Voltage Across the Furnace
Another method for temperature control is by varying the voltage across the furnace. This can be done by changing the transformer tappings or using an auto-transformer or induction regulator for variable voltage supply. However, this method is not economical for large furnaces as power is continuously wasted in the controlling resistance. Therefore, it is more commonly used in small furnaces.
3. Varying the Resistance of the Elements
Temperature can also be controlled by varying the resistance of the elements in the furnace. This method allows for fine-tuning of the heat developed in the furnace.
4. Adjusting the On and Off Times of the Power Supply
Additionally, temperature control can be achieved by adjusting the ratio of on and off times of the power supply. This method provides another way to fine-tune the heat in the furnace.
Continue exploring, consult our experts
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