Here i am trying to explain the basic of Deaerator, and the function of deaerator.

1. DEAERATOR

2. Purpose of deaerator
 provide NPSH to BFP
 removal of gasses
 act as a heat exchanger

3. Mechanical deaeration by a feed water
deaerator can cut the amount of
chemical consumables used for water
conditioning for a continuing operating
cost saving.

4. Principle of Deaeration
Henrys law: gas solubility in a solution
decreases as the gas partial pressure above the
solution decreases .

5. Principle of Deaeration:
Solubility Law: Solubility of gases decreases
with increase in solution temperature .

6. TEMPERATURE EFFECT

7. Type of deaerator
• Tray type deaerator
• Spray type deaerator

8. The feed water is sprayed in thin films into a steam atmosphere allowing it
to become quickly heated to saturation. Spraying feed water in thin films
increases the surface area of the liquid in contact with the steam, which, in
turn, provides more rapid oxygen removal and lower gas concentrations.
This process reduces the solubility of all dissolved gases and removes it
from the feed water. The liberated gases are then vented from the
deaerator
Deaeration process
CONDENSATE
Tray type Deaerator