Why are air heaters implemented in steam generating units?

The implementation of air heaters in steam generating units primarily serves the purpose of recovering heat from hot flue gases. This process enhances the overall efficiency of the steam generation system by utilizing waste heat that would otherwise be lost to the environment.

By transferring heat from the flue gases to the incoming combustion air, air heaters improve the temperature of the air entering the combustion chamber. This preheating of the air facilitates more efficient fuel combustion, leading to a reduction in the amount of fuel required to achieve the necessary steam output. Consequently, this not only optimizes fuel consumption but also minimizes greenhouse gas emissions, contributing to more sustainable operations.

Additionally, recovering heat in this manner can help reduce the overall thermal load on the boiler, leading to longer equipment lifespan and further operational efficiency. Overall, the integration of air heaters is a strategic decision aimed at elevating the performance of steam generating units through enhanced heat recovery.