What is a deaerator primarily used for in a boiler system?

A deaerator is primarily used in a boiler system as a feedwater heater that separates gases from the water being fed into the boiler. Its main purpose is to remove dissolved gases, particularly oxygen and carbon dioxide, from the feedwater prior to it entering the boiler. This is crucial because the presence of these gases can lead to corrosion and damage to boiler components, ultimately affecting the efficiency and longevity of the boiler system.

By heating the feedwater as part of the deaeration process, it not only aids in the removal of these deleterious gases but also prepares the water for effective steam generation. The removal of oxygen is particularly important, as it can lead to severe corrosion issues, which must be avoided to maintain the overall health of the steam system. Thus, the functionality of a deaerator is integral to ensuring the reliability and efficiency of a boiler operation, making the first choice definitive in identifying its primary role.