air preheatercorrectA heat exchange device that uses the heat from the exhaust gas at the tail of a boiler to heat the air required for fuel combustion and improve boiler efficiency.

An air preheater is a boiler that heats up the airTail eyeThe flue gas in the boiler is preheated to a certain temperature on the heating surface before entering the boiler through the internal heat sinkUsed to improve the heat exchange performance of boilers and reduce energy consumption.

It is generally referred to as an air preheater. Mostly used for coal-fired power plant boilers. It can be divided into two types: tube box type and rotary type, among which rotary type is further divided into wind cover rotary type and heating surface rotary type. At present, power plant boilers commonly use heating surface rotary preheaters. The application in boilers is generally divided into two compartments, three compartments, and four compartments, among which the four compartments are more commonly used in circulating fluidized bed boilersIn the middle.

　　airpreheaterWorking principle: It is relatively simple, the flue gas flows through the outside of the heat exchanger, and the air flows through the finned tubes of the heat exchangerIt passes through the inside and conducts heat through different temperature differences. The principle is the same as that of economizer, superheater, etc.The main heat transfer component of the air preheater is thin-walled steel pipe. Tube type air preheaters are often cubic in shape, with steel pipes arranged vertically and staggered with each otherColumn, both ends welded onto the upper and lower tube plates.The air preheater is equipped with a middle tube plate inside the tube box. The flue gas flows up and down through the preheater along the steel pipe, while the air passes horizontally through the preheater to complete heat conduction.

The advantages of tubular air preheater are good sealing, high heat transfer efficiency, easy manufacturing and processing, so it is widely used in power plant boilers and industrial boilers

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