Heat exchangers are a key component in industrial and power plant systems, responsible for transferring heat between two or more fluids. One of their important applications is in air preheating systems. These exchangers use the waste heat from combustion exhaust gases (flue gases) to warm the air required by burners to a high temperature (usually up to 350°C) before it enters the furnace or boiler.

This process significantly increases the system's thermal efficiency because energy that would otherwise be wasted is reused. In addition to improving efficiency, air preheating helps reduce fuel consumption and, consequently, lowers pollutant emissions.

In summary, these exchangers absorb heat from the hot exhaust gases exiting the furnace and transfer it to the air entering the burners, enabling a more optimal and complete combustion. This leads to both economic savings and reduced environmental impact.