For illustration purposes, let's take the rotary air preheater as an example to explain the principle of air preheaters. During operation, they slowly rotate [2], allowing flue gas to enter the flue gas side of the air preheater and then be exhausted. The heat carried by the flue gas is absorbed by the fins inside the air preheater. Afterward, the air preheater rotates slowly, and the fins move to the air side, transferring the heat to the air before it enters the boiler.
Air preheaters are commonly used in boilers in a three-compartment design, featuring a fire alarm system, gap adjustment system, and variable frequency control system. The air preheaters are easy to use, simple to operate, and safe in operation, while also enhancing the heat exchange performance of the boiler system. As a result, they are widely employed in flue gas boiler systems.
