Thermal deaerators are used mainly to eliminate any oxygen present in the water supply. They consist of two chambers: the upper chamber, where the deareation is carried out and the lower chamber where the deaerated water is stored.
The upper section, that is to say the deaerator head, is constructed using stainless steel. It contains two deareation chambers and a device for purging non-condensables.
The water to be deaerated "Condensed, treated water and return of condensed" is fed into the deaerator head through the upper section, through a sparger that atomizes the water inside the deaerator. The water rapidly reaches working temperature, and the first phase of deareation takes place, in which most of the oxygen is eliminated.
The water then passes to the second deareation chamber, the mixture chamber. This chamber, made of stainless steel, comprises two concentric bodies. The interior is perforated to permit the steam to pass through, which as it rises toward the deaerator head comes into contact for the second time with the deaerated water, which is flowing downwards in the opposite direction. This water thus undergoes a scrubbing process by this steam that bubbles through it and reduces the content of non-condensable gases even more. Finally the deaerated water flows down into the tank where it is stored.