Dry-burning electric heating rods are used to heat the air. When the surface load of the dry-fired electric heating rod is relatively small, the surface temperature of the dry-fired electric heating rod can be heated to below the temperature resistance of the pipeline.

However, when the surface load of the dry-fired electric heating rod is large and the surface temperature of the dry-fired electric heating rod is greater than the temperature of the pipe, it should be controlled by a temperature control instrument. When the temperature control probe detects that the surface temperature of the dry-fired electric heating rod reaches the predetermined temperature At the time, the power supply of the dry-burning electric heating rod should be cut off, and the heating should be stopped. Turn on the power supply below the predetermined temperature again.