How does a deaerator (DA) remove non-condensables from water?

The process by which a deaerator removes non-condensables, such as oxygen and carbon dioxide, from water primarily involves the principles of centrifugal force and differential pressure. In a deaerator, water is heated and then exposed to steam in a controlled environment. The combination of heat and turbulence created by mechanical components causes non-condensable gases to be separated from the water.

As the water is heated, it reaches a point where most of the dissolved gases become less soluble and start to rise to the surface. Meanwhile, centrifugal force assists in separating these non-condensables from the water by concentrating them in specific areas, making it easier to vent them out of the system.

This method is highly effective for ensuring that feedwater entering a boiler is free of oxygen and other gases that could lead to corrosion and operational issues. Thus, utilizing centrifugal force and differential pressure in the operation of a deaerator is a central means by which it accomplishes the removal of non-condensables from the water.