How the air heater works

- Sep 29, 2020-

How the air heater works

 

The air heater is an electric heating equipment which heats the gas flow. The heating element of the air heater is stainless steel electric heating tube. The inner chamber of the heater is provided with multiple baffles (guide plates) to guide the gas flow direction and prolong the gas retention time in the inner chamber, so as to fully heat the gas, make the gas heating uniform and improve the heat exchange efficiency. The heating element of the air heater is the stainless steel heating tube, which is made by inserting the electric heating wire into the seamless steel tube and filling the gap part with magnesium oxide powder with good thermal conductivity and insulation and then shrinking the tube. When an electric current passes through a high temperature resistance wire, the heat generated diffuses through the crystalline magnesium oxide powder to the surface of the heating tube, and is then transferred to the heated air to achieve the purpose of heating.

 

The air heating element works by placing a primary coil with a higher number of turns and a secondary coil with a lower number of turns on the same core. The voltage ratio of input to output is equal to the number of turns in the coil, while the energy remains constant. Thus, the secondary coil generates a large current at low voltage. For the induction heater, the bearing is a short-circuited single-turn secondary coil that passes through a large current at a lower AC voltage, thus generating a large amount of heat. The heater itself and the yoke are kept at room temperature. Because this method of heating induces an electric current, the bearings are magnetized. It is important to ensure that the bearing is degaussed in the future so that it does not trap metal magnetic chips during operation. FAG induction heaters have an automatic degaussing function. It is the use of metal in alternating magnetic field to generate eddy currents to heat itself, usually used in metal heat treatment and other aspects. The principle is that a thicker metal in an alternating magnetic field generates an electric current due to electromagnetic induction. Thicker metals generate an electric current, which creates a spiral path through the metal itself, absorbing the heat generated by the current and causing the metal to heat up quickly. Evenly distributed in the high temperature resistant stainless steel seamless tube of high temperature resistance wire, dense part in gap to fill in the performance of thermal conductivity and good insulation performance are the crystallization of magnesium oxide powder, this kind of structure not only advanced, high thermal efficiency, and even heating, when high temperature resistance wire in an electric current passes through the heat to the metal surface diffusion through crystallization of magnesium oxide powder, then passed to the heated or air, achieve the purpose of heating.