SRQ Air HeaterA primary coil with many turns and a secondary coil with fewer turns are mounted on the same iron core. The ratio of input to output voltage equals the ratio of coil turns, while energy remains constant. Therefore, the secondary coil generates a large current under low voltage conditions. For induction heaters, the bearing acts as a short-circuited single-turn secondary coil, carrying a large current at a low AC voltage, thus generating significant heat. The heater itself and the magnetic yoke remain at room temperature. Since this heating method induces current, the bearing becomes magnetized. It is important to ensure that the bearing is demagnetized afterward so that it does not attract metal chips during operation. FAG induction heaters have an automatic demagnetization function.
It utilizes the eddy currents generated in metal within an alternating magnetic field to heat itself, commonly used in metal heat treatment and similar applications. The principle is that when a thicker metal is placed in an alternating magnetic field, current is induced due to electromagnetic induction. In thicker metals, the induced current forms a spiral flow path inside the metal, so the heat generated by the current is absorbed by the metal itself, causing it to heat up quickly.
High-temperature resistance wires are evenly distributed inside a high-temperature resistant stainless steel seamless tube, and the gaps are densely filled with crystalline magnesium oxide powder, which has good thermal conductivity and insulation properties. This structure is not only advanced and highly efficient but also provides uniform heating. When current flows through the high-temperature resistance wires, the generated heat diffuses through the crystalline magnesium oxide powder to the surface of the metal tube and then transfers to the heated object or air, achieving the purpose of heating.
The electric air heater is mainly used to heat the required air flow from the initial temperature to the desired air temperature, up to 850°C.
Technical Features
1. It can heat air to very high temperatures, up to 450°C, while the shell temperature is only about 50°C.
2. High efficiency: up to 0.9 or more.
3. Fast heating and cooling rates, up to 10°C/s, with quick and stable adjustment. There is no leading or lagging phenomenon of the controlled air temperature that would cause temperature control drift, making it very suitable for automatic control.
4. Good mechanical performance: Because the heating element is made of special alloy materials, it has better mechanical properties and strength than any other heating element under the impact of high-pressure air flow, which is particularly advantageous for systems and accessory tests that require continuous air heating for long periods.
5. Durable and long-lasting, with a service life of up to several decades when used in accordance with operating procedures.
6. Clean air and small size.
Application Areas
Heater applications: Air heaters are widely used. Commonly referred to as air heaters, they can be further classified into many types based on the gas being heated, such as nitrogen heaters and hydrogen heaters. These can also be called duct-type gas heaters. They are widely used in aerospace, ordnance industry, chemical industry, and many scientific research and production laboratories in universities. They are particularly suitable for automatic temperature control and high-flow high-temperature combined systems and accessory tests. Electric air heaters have a wide range of applications: they can heat any gas, producing hot air that is dry, non-conductive, non-flammable, non-explosive, non-corrosive, non-polluting, safe, and reliable, with fast heating of the heated space (controllable).
