How does a Deaerator (DA) remove oxygen and non-condensable gases?

A Deaerator (DA) is specifically designed to remove dissolved oxygen and other non-condensable gases from boiler feed water to prevent corrosion and ensure efficient operation. The most effective method employed in a deaerator involves techniques such as bubbling, where the feed water is passed through steam, which helps in both heating the water and forcing the gases out of solution.

As the feed water enters the deaerator, steam is injected, promoting the release of oxygen and other dissolved gases. The bubbling process increases the surface area of the water and allows for better contact with the steam, enhancing the removal efficiency. Additionally, chemical treatment can be used to further assist in neutralizing any remaining gases, but the fundamental operation relies on the physical process of heating and degassing through steam contact.

This method is highly effective and widely used in high-pressure boiler systems, thoroughly ensuring that most of the non-condensable gases are removed before the water enters the boiler.