What is typically added to water in a Deaerator (DA)?

In a Deaerator, sodium hydroxide is typically added to the water primarily to raise its pH level and improve the solubility of dissolved gases, particularly oxygen and carbon dioxide. By ensuring a higher pH, sodium hydroxide aids in reducing the corrosive potential of these gases in the boiler system. The removal of dissolved oxygen is crucial as it can lead to oxidation and corrosion of metal components within the boiler and associated piping systems.

The use of sodium hydroxide in the deaeration process is a standard practice to enhance boiler efficiency and longevity, ensuring safe and reliable operation. The presence of other chemicals, such as calcium carbonate or chlorine, serves different purposes and would not typically be used in the deaeration process; calcium carbonate is mainly related to water hardness and scaling, while chlorine is used for disinfection and not suitable in this context. Similarly, di phosphate would pertain more to water treatment and conditioning rather than specifically in the deaeration process.