This depends on the structure of the heater. The frequency converter can only change the frequency of the alternating current, thereby changing the rotation speed of the motor and achieving the purpose of changing the output power of the motor. The heater does not rotate, and the frequency conversion cannot control the heating speed.
There are two simple methods:
1. Use diode half-wave rectification to change the effective value of the alternating current to achieve the purpose of changing the heating power and heating speed; this method is the most widely used, and its advantage is that the circuit structure is simple and easy to operate.
2. Transformation, using a small transformer to transform the voltage, the advantage is that it can be adjusted in multiple stages, but the disadvantage is that the circuit structure is more complicated and the production cost is high.
Functional characteristics of fluid explosion-proof electric heater
1. Small size and high power: The heater mainly adopts clustered tubular electric heating elements.
2. Fast thermal response, high temperature control accuracy, and high comprehensive thermal efficiency.
3. High heating temperature: The maximum working temperature of the heater design can reach 850℃.
4. The medium outlet temperature is uniform and the temperature control accuracy is high.
5. Wide application range and strong adaptability: The heater can be used in explosion-proof or ordinary occasions. The explosion-proof grade can reach dⅡB and C. The pressure resistance of the air heater can reach 20MPa.
6.Long life and high reliability: The heater is made of special electric heating materials, the design surface power load is low, and the use of multiple protections greatly increases the safety and life of the electric heater.
7. Fully automatic control: According to the requirements of the heater circuit design, it is convenient to realize the automatic control of parameters such as outlet temperature, flow, pressure, etc., and can be networked with computers.
8. The energy-saving effect is remarkable, almost 100% of the heat generated by electric energy is transferred to the heating medium
