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Deaeration is the mechanical removal of dissolved gasses such as oxygen and carbon dioxide from a fluid. Feedwater to the boller should contain less than 0.005 cc of 0₂ per liter (7 ppb) or less.

Termochimica's Spray & Tray Deaerators Incorporate a strong basis design that assure the above mentioned performance over varying loads of incoming water.

The process of Termochimica Deaerators involves two main stages in which the steam and water move in opposite directions (see figure "Internal Diagrams"):

1) cold water enters at the top of deaerating tower in order to be sprayed through special designed stainless steel spray-valves into a steam atmosphere. Self -adjusting spring-loaded spray valves provide the breaking down of water into thin films or droplets . By this action, the distance a bubble of gas has to travel to be released, is greatly reduced and a large percentage of the gases are removed in this section.

2) in the second stage the water rains through a series of special designed stainless steel perforated trays , countercurrent to the steam . Fresh gas-free steam enters from the bottom of deaerating tower and flows upwards scrubbing out the last traces of the residual oxygen and carbon dioxide. Efficient scrubbing is essential to achieve 7 ppb of oxygen effluent quality.

Gases O₂ and CO₂ mixed with a little steam flow-rate , are discharged to the external atmosphere through vent nozzles completed with calibrated orifices and vent condenser direct-contact type. Since 1969 Termochimica supplied Deaerators to the main EPC Companies or Users involved in power stations , such as ABB Lummus , Agip Gas, Alstom Power, Enelpower, Formosa Chemicals, Fisia Italimpianti, Foster Wheeler, JGC Corporation, Koch Glitsch, Nuovo Pignone , Tecnimont, Snamprogetti, Standard Fasel Lentjes. The performances of deaeration granted by Termochimica are based on dedicated processes developed by experienced engineers and project managers which enable Termochimica to design and supply Deaerators guaranteed to meet full compliance with the requirements of our customers.