Influencing Factors of Air Heater
The air heater is an electric heating device that mainly heats the gas flow. The heating element of the air heater is a stainless steel electric heating tube, and the inner cavity of the heater is equipped with multiple baffles (baffles) to guide the gas flow direction and extend the residence time of the gas in the inner cavity, so that the gas is fully heated and the gas The heating is uniform and the heat exchange efficiency is improved. The heating element of the air heater is stainless steel heating tube, which is made by inserting electric heating wire in seamless steel tube, and the gap is filled with magnesium oxide powder with good thermal conductivity and insulation. When the current passes through the high-temperature resistance wire, the heat generated is diffused to the surface of the heating tube through the crystalline magnesium oxide powder, and then transferred to the heated air to achieve the purpose of heating.
Influencing factors:
1. Increasing the gas inlet flow rate of the air heater can enhance the convection heat exchange of the air heater, and reduce the surface temperature of the electric heating element in the air heater, which not only helps to extend the service life of the air heater electric heating element, but also makes the air The heat dissipation loss of the electric heater is reduced, so the efficiency of the air heat exchanger is improved, but if the speed is too high, the pressure loss will increase sharply, which will not be conducive to the improvement of the heating efficiency.
2. If other conditions remain unchanged and the surface load is changed, the wall temperature of the electric heating element in the air heater will change linearly. If the surface load becomes larger, the wall temperature of the electric heating element will increase, which will reduce the electric heating element in the air heater. However, if the surface load is too small and the wall temperature is too low, the efficiency of the air heater heat exchanger is reduced, so the selection of the surface load of the electric heating element in the air heater is more important.
