Definition

The air preheater is the heating surface where the flue gas in the tail flue of the boiler preheats the air before entering the boiler to a certain temperature through the internal radiator. It is used to improve heat exchange ability of boilers and reduce energy consumption.

It is mostly used in coal-fired utility boilers. It can be divided into tube box type and rotary type. The rotary type can be divided into wind hood rotary type and heating surface rotary type. The rotary preheater with heating surface is often used in power plant boilers. Generally, the application in boilers is two-compartment, three-compartment and four-compartment, among which the four-compartment is more commonly used in circulating fluidized bed boilers. 

Working principle

The main heat transfer component of tubular air preheater is thin-walled steel pipe. It is mostly cubic. The steel pipe is vertically staggered between each other, and the two ends are welded on the upper and lower tube plates. It is equipped with an intermediate tube plate in the tube box. The flue gas passes through the preheater up and down the steel pipe, and the air passes through the preheater horizontally to complete the heat conduction.

Product feature

(3) easy to manufacture and process.

Application