Air Heater Tubes

Air preheater tubes are made from Cold Drawing process and are generally of Carbon Steel material. The application of these tubes is in an area where the tubes is not subjected to extremely high temperatures and pressures. Hence, the use of Carbon Steel tubes in applications for Air Preheater Tubes is generally preferable. There are various types of Air Preheaters; one of them widely used is Tubular Type Air Preheater. In this type of Air Preheater, straight tube bundles are used, which pass through the outlet ducting of the boiler and open at each end outside of the ducting, The hot furnace gases pass around the air preheater tubes, transferring heat from the exhaust gas to the air inside the preheater. Ambient air is forced by a fan through ducting at one end of the air preheater tubes and at other end the heated air from inside of the tubes emerges into another set of ducting, which carries it to the boiler furnace for combustion. There are other Heat Exchangers like Regenerative Heat Exchangers, Recuperators, economizers which also make use of Air preheater tubes (Heat Exchanger Tubes).