Simply put, deaeration is the process of removing air molecules from liquid or another gas. There are several potential reasons for deaerating a gas or liquid. These include removing oxygen and other gases from feed water, heating up incoming water before returning condensate at a specific temperature, reducing the possibility of solubility of gases, and injecting water at the highest possible temperature.
Deaeration to Prevent Corrosion
Deaeration, either mechanical or chemical, is a vital component of boiler water control and protection. Corrosion is a serious concern in boiler systems and dissolved gas is the most common culprit. Even a very small amount of gas can result in iron deposits and pitting inside the boiler system. Unfortunately, makeup water and condensate return feed water often carry oxygen into the boiler system. Other potential sources of oxygen include
- Leaks along suction pumps
- Open condensate receiving tanks
- Non-deaerated water in condensate pump seals