Working principle and application of radiant heating tube

Radiant tube heaters (infrared heaters, water-electricity separation heaters) feature a heating element mounted within a heat-resistant stainless steel casing. This isolates the element from the furnace's atmosphere and prevents corrosion. To prevent deformation and short-circuiting at high temperatures, the element is pre-installed on a dedicated support made of insulating refractory material. During operation, current is introduced to the element through a power connector and lead-out rods. Heat generated by the element heats the casing, which is then transferred to the heated object through radiation from the stainless steel tube's high-temperature surface. This heating method is the operating principle of radiant tube heating elements.

Because the high-temperature heating element is protected by the heat-resistant stainless steel casing from the corrosive effects of the furnace's atmosphere, its service life is extended. Therefore, this type of heater can be used in all corrosive media. Radiant tube heating elements are widely used in carburizing heat treatment furnaces. For example, furnaces such as automotive gear carburizing furnaces, railway bearing carburizing furnaces, and motorcycle parts carburizing furnaces utilize radiant tube heating elements extensively. It can also be used for heating household water heaters. Since the heating wire and water are separated, it can better prevent leakage.