Deaeration is a process by which dissolved gases are removed from water. Since proper deaeration of boiler feed water is essential to minimise oxygen corrosion and carbon dioxide attack, almost every boiler plant uses deaerating systems. Nowadays modern deaerating systems can be designed to obtain a residual oxygen content as low as 0.005 ml/liter.

Termokimik deaerators are designed to meet all the above requirements. The effectiveness of deaeration is the result of many design features, including two-stage deaeration, counter current flow of steam and water and specially designed scrubbing chambers.

A wide range of applications is covered by Termokimik’s deaerators: from utility boilers, to tires curing, from food processing to ultra-pure water.

There are basically two families of Deaerators: Thermal Deaerators and Vacuum  Deaerators.

Thermal Deaerators
Thermal Deaerators reduce dissolved gases, particularly oxygen, to a very low level and raise the condensate temperature by exchange with extraction steam.
There are three different types of Thermal Deaerators: Spray, Tray and Spray-Tray Types.

Spray Type
Spray type Deaerators are simple, cost effective and virtually maintenance free systems that can operate under variable loads without significant impact on heating or deaerating performances. For the above reasons, this kind of Deaerator is widely used for industrial applications.

Spray Deaerators do not require corrosion resistant materials because all the water in contact with the shell is sufficiently deaerated and non-corrosive at the operating conditions.

It is important to note that an average temperature difference between steam and un-deaerated water should be in the range of 18 °C.

Tray Type and Spray-Tray Type
In case better efficiencies or higher capacities are requested, the preference normally goes to Tray or Spray-Tray type Deaerators.

Virtually there is no temperature degradation in Tray heaters and this characteristic is very important in large plants, where heat loss can be a key economic factor.

This kind of Deaerator can operate at very low temperature difference between water and steam.

Vacuum Deaerators
Vacuum type Deaerators are used to obtain a very efficient carbon dioxide removal as well as a good oxygen removal from demineralised water. Single or multiple stage vacuum deaerators are available.

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