How to control the heating speed of pipeline heaters?

How to control the heating speed of pipeline heaters?

How to control the heating speed of pipeline heaters? This depends on the structure of the electric heater, and the frequency converter can only change the frequency change of the AC power, thereby changing the rotational speed of the motor to achieve the purpose of outputting power. And the heater does not rotate, so variable frequency cannot control the heating speed.

1. By using diode half wave rectification to change the effective value of AC power, the electric heater can achieve the goal of changing heating power and heating speed; The advantage of this method is that the circuit structure is simple and easy to operate.

2. Use a small transformer to change the heating speed of the electric heater. The advantage of this method is that it can adjust multiple levels, but the disadvantage is that the circuit structure is relatively complex and the production cost is high.

3. Reasonably describe the air volume and temperature rise. The power of an air electric heater is determined based on the calculation of air volume and temperature rise. On the premise that the air volume and temperature rise meet the requirements, it is not advisable to choose a too large air volume and temperature rise, as excessive air volume and temperature rise directly lead to excessive power of the heater and additional energy consumption. Excessive air volume and temperature rise are unnecessary. To summarize and think, describe reasonably, and determine appropriate parameters.

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4. The exterior of the pipeline electric heater should be insulated. Most power plants (owners) only insulate the pipes at the outlet of the air electric heater when using it, without any insulation treatment on the surface of the electric heater itself. According to the data, adding insulation layer on the surface of the electric heater can reduce energy consumption by 5% to 10%. If the energy consumption savings are significant after long-term operation, the power plant (owner) should install insulation layer on the air electric heater along with the pipeline.

5. The pressure of the downward pipeline electric heater itself is lost. When the air that needs to be heated flows through the interior of the air electric heater, pressure loss occurs. The greater the pressure loss, the greater the energy consumption of the fan. Improvement should be made in the layout of the air electric heater itself to reduce the pressure loss that occurs.

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