Working principle and performance analysis of air heater

An air heater is an electric heating device that mainly heats the gas stream. The heating element of the air heater is a stainless steel electric heating tube, heating chamber is provided with a plurality of baffle plate (plate), to guide the gas flow, prolong the gas residence time in the chamber, so that gas is heated sufficiently, the gas heating uniformity, improve the efficiency of heat exchange. Heating element: stainless steel tube air heater, electric heating wire is loaded in the seamless steel pipe, the void is filled with good heat conductivity and insulation of magnesium oxide powder after a pipe. When the current through the high temperature resistance wire, the surface of the heat pipe diffusion through the heating crystallization of magnesia powder, and then pass to the heated air, to achieve the purpose of heating.

Chinese name air heater with high efficiency up to 0.9

The heater is a pressure vessel and is resistant to oxidation by high temperature air. Therefore, the material must be stainless steel. The heating element of the air heater is made of stainless steel electric heating tube. A plurality of baffle plates are arranged in the inner cavity of the heater, which can prolong the air retention time in the inner cavity of the heater, so as to improve the heat exchange efficiency. The increase of heating tube quantity and the installation power of air heater can shorten the heating time of production line. The melt blowing process requires higher temperature control accuracy of the draft air heater, and the draft air temperature is required to be within the range of + 1 DEG C.

Working principle

A primary coil with a greater number of turns and a secondary coil with fewer turns are mounted on the same core. The ratio of the input to output voltage is equal to the ratio of the turns of the coil, while the energy remains constant. As a result, secondary coils produce large currents at low voltage conditions. For induction heaters, the bearings are secondary coils with shorted single turns, which produce large amounts of heat through large currents at lower AC voltages. The heater itself and the yoke remain at normal temperature. Because the heating method can induce the current, the bearings will be magnetized. It is important to ensure that after bearing degaussing, make in the course of the operation will not attract metal chip, FAG induction heater has automatic degaussing function [1].

It is the use of metal to produce eddy currents in alternating magnetic fields to heat itself, usually in metal heat treatment. The principle is that when a thicker metal is in an alternating magnetic field, it will produce an electric current due to electromagnetic induction. The thicker the metal current, current flow path will form a spiral in the metal, so due to the flow of the current heat is absorbed the metal itself, will cause metal quickly warming up.

Uniform distribution of high temperature resistance wire in high temperature stainless steel seamless tube, dense in the void fill in the thermal conductivity and crystallization of magnesium oxide powder properties have good insulation, this structure is not only advanced, high thermal efficiency, and uniform heating, when the high temperature resistance wire in a current passes through the heat generated by the surface diffusion to the metal tube crystal magnesia powder, and then pass to the heating or air to achieve the purpose of heating.

The air heater is used to heat the required air flow from the initial temperature to the required air temperature, up to 850 degrees centigrade.

What we usually mean is that the air heater is actually used to heat up the air stream we need from the initial temperature to the required air temperature. The maximum temperature can be heated to 850 degrees. The air heater is mainly composed of an electric heating tube, a heat exchange chamber, a flow deflector, a flange, a connecting pipe, a temperature measuring sensor, an integral bracket and an outer shell connected to the heat exchanger chamber.

The heating gas enters the heat exchange cabin of the heater by the air inlet or the air inlet valve through the air inlet, is heated by the heating tube, and fully heat up in the heat exchange chamber to reach the required temperature, and then comes out from the air outlet. An air outlet is provided with a temperature sensor, the temperature signal is collected and passed to the control system, the power output of the heater control system, to achieve automatic control of the temperature, the temperature sensor is also equipped with the heat transfer in the cabin, the main role is to monitor the temperature of the heating pipe, heating pipe or when over temperature exceeds the set temperature range, then will automatically cut off the power supply of the heater, the heating is stopped. By this time the heating of the desired air has been completed.