True or False: Maintaining combustion gases at a higher temperature than the dew point can help prevent corrosion of air heaters.

Maintaining combustion gases at a higher temperature than the dew point is crucial in preventing corrosion of air heaters. When flue gases cool below the dew point, water vapor in the gases can condense, leading to the formation of corrosive condensates, which can contain sulfuric acid and other harmful substances. This condensation can significantly deteriorate materials and components of the air heater over time.

By ensuring that the combustion gases remain above this critical temperature, it prevents moisture from condensing within the air heater and helps maintain a dry environment that is less conducive to corrosion. This practice is essential for longevity and reliability of the air heating equipment, reducing maintenance costs and prolonging the operational life of the equipment.