According to the survey, electric heaters in the field of industrial applications more and more widely, such as petroleum, machinery, chemicals, printing and dyeing, shipbuilding, electricity and other industries in a highly efficient energy-saving heating, heating, viscosity reduction equipment, its replacement The traditional fuel, coal, steam heating, etc.. And this electric heater in the industrial field has been widely used. Its heat element is used in the alloy, the thermal resistance of its own resistance characteristics can make it automatically adjust the heating power, according to the process design temperature to adjust the dynamic heating power, to the catalyst through the equipment pipeline heating medium, thereby enhancing the activity of the catalyst, Can produce more models of products, improve economic efficiency. However, these types of electric heaters in the course of the use of different failures, so in order to deal with failure in a timely manner to its normal operation, you must master this type of electric heater works.
Here we briefly introduce the working principle of electric heater:
This section of the heating element for the triangular wiring, the outlet of the electric heater with a temperature sensor, thermocouple for the temperature components, the temperature up to 800 degrees. Process to adjust the heating power is mainly through the regulator module, the triac of the conduction angle control to achieve the size of the regulator module output voltage to change the heater power (as shown below). Process need to start the heater, the first turn on the power switch, and to ensure that the emergency stop is closed, without any fault alarm under the premise of pressing the start button contactor pull, the upper part of the regulator module live. The medium temperature detection device can detect the temperature of the medium in the equipment. After the temperature signal is converted into the current signal by the medium temperature transmitter, the temperature is compared with the basic heating temperature signal set by the process and the control signal is sent To the regulator module of the computer intelligent controller, control the triac, to adjust the output voltage of the module to change the power of the heater to achieve the purpose of controlling the temperature of the medium.
When the set temperature is reached, the heater enters the thermostatic state. During the heating process, the overheat temperature controller detects the temperature inside the heater through the heating element and sends the device internal temperature signal to the control system via the node. The heating distance is used to measure and display the temperature of the medium, providing power to the temperature signal device. At the same time, the measured medium temperature signal is sent to the control system. The control system calculates the temperature of the medium and the temperature of the heating element and automatically sends out the control signal to the regulator module to control the output power of the heater.