Analysis of the characteristics of various common heating methods of electric heaters:
The electric heater achieves the purpose of heating by causing the alloy electric heating wire to generate high temperature by turning on the power. In the actual production process, the electric heater usually has many heating methods, including resistance heating, induction heating, arc heating, electron beam heating. Infrared heating, medium heating, etc., each has its own distinctive characteristics.
When the electric heater is heated by electric resistance, it uses the Joule effect of the current to convert the electric energy into heat energy to heat the object, wherein the direct resistance heating is generated by the heated object itself, so the thermal efficiency is high; and the indirect resistance heating The type of the object to be heated is generally not limited and is easy to operate.
The induction heating of the electric heater requires the conductor to be in an alternating electromagnetic field, so that the thermal effect caused by the induced current causes the conductor itself to generate heat. The heating method is applied on the premise that the heated object must be a conductor to uniformly heat the object as a whole. And surface heating.
Arc heating is also a common heating method for electric heaters. In order to keep the arc stable during arc heating, the instantaneous value of the circuit voltage is greater than the arcing voltage value when the arc current instantaneously crosses zero, and in order to limit the short circuit current, in the power supply circuit, A resistor of a certain value must be connected in series.
The electrons are bombarded by electrons moving at high speed under the action of an electric field, so that they are heated to become electron beam heating. The electric heater also uses this heating method, which not only can change the heating power conveniently and quickly, but also can freely The heated portion is changed or the area of the electron beam bombardment portion can be freely adjusted; the power density is increased so that the substance at the bombardment point evaporates instantaneously.
In addition, the electric heater has two heating modes of infrared heating and medium heating. The former has the advantages of small energy loss, easy temperature control, high heating quality, and the latter has high heating speed, high thermal efficiency, and uniform heating.