Deaerators are used to remove oxygen and gases from water feeds located in boilers that generate steam. All four deaerators the boiler standard deaerator, the spray type deaerator, the tray type deaerator and the cascade type deaerator serve useful purposes in the sense that they have the ability to remove gases that attach to metallic components located within the steam generating system. If left unchecked, these components would have become susceptible to corrosion which, in turn, form oxides and rust. Oxygen and carbon dioxide are two of the main culprits of corrosive formations.
Most deaerators are able to reduce oxygen to levels that create environments for the removal of carbon dioxide. Tray type deaerators have a vertical section that is domed and mounted to the top of a horizontal tank that stores water. The spray type alternative is cylindrical in shape. Both these tanks deaerate and store water. Deaerators condition feed water in order to remove dissolved gases prior to being used in the system and ultimately corroding it. Feed water used and stored remains cold.
The conditioning of feed water needs to comply with industrial standards related to the operating practices for the sampling and monitoring of water. Standards deal with the removal of dissolved oxygen through mechanical means in order to reduce the need to treat water with chemical oxygen scavengers and removing dissolved gas through mechanical means. That being said the steam network needs to be protected. The ability to prevent corrosion and system failure must also be intact.
This continues to be done through the removal of dissolved non-condensable gases in order to improve the steam system’s efficiency of purpose. Cold water still needs to be heated in order to protect the boiler from thermos shock and help extend the life of it.