Air preheater (air pre-heater) is boiler tail flue gas through the inside of the radiator before entering the boiler air preheating to the temperature of the heating surface. Used to improve the performance of the heat exchange of the boiler and reduce energy consumption.
Commonly referred to as aph. Used for coal-fired utility boilers. Both can be divided into control box, rotating, Rotary is made up of Hood Rotary and Rotary heating surface in two ways. Boiler heating surface is often used in Rotary preheater. Application in boiler in two warehouse, a three-block, four-the warehouse, four warehouse more frequently used in circulating fluidized bed boiler.
Tube heater works: simple, flue gas flows through from outside the tube, from inside the box through the air, through different heat transfer temperature difference. With the economizer, superheater, the same principle.
Rotary preheater works: heater rotor formed by tens of thousands of meters of heat transfer components, slow rotation of air preheater, alternate reverse flue gas and air flow through the air preheater. Thermal storage components in the flue gas side heat, air side heat, thus reducing flue gas temperature of boilers, raise preheating temperature of hot air.