De-aerator

Removing oxygen or uncondensable gas inside power station water steam cycle can by injecting hydrazine (N2H4) and by mechanically use de-aerator tank. Since hydrazine said toxic chemical, de-aerator tank performance should be maximalized.

There are two steps of work for de-aerator tank work for removing oxygen and uncondensable gas as descibe below.

Spray Scrubbing Deaerators

Perform best at stable high load conditions.

Perform best when approaching water stream is approximately 50 0 F less than the feedwater temp. (Higher temperatures reduce the amount of steam addition and can lead to increased venting needs).

Rely on excellent spray nozzle operation to break the water up into fine droplets.


Step one is the prime element is self adjusting spray valve that allows incoming water, which is to be de-aerated to discharge as a thin walled, hollow cone spray.

Most of the dissolved oxygen and free carbon dioxide have been remove at this point

Step Two is water from collection basin flows down the vertical down comer and into the scrubber section where it comes in contact with upcoming steam.

Through carefully sized orifices, the steam and water violently mix, heating and removing the remaining gases from water








The solubility of oxygen in water is dependent upon the temperature and pressure. Oxygen content of cold makeup (70 F) will contain 8 to 10 ppm of oxygen.