What is Deaerator and it's function in thermal power plant?
The function of the
Deaerator is to remove dissolved non-condensable
gases and to heat boiler feed water. It consists of a pressure vessel
in which water and steam are mixed in a controlled
manner. When this occurs, water temperature rises, and all
non-condensable dissolved gases are liberated and removed and the effluent water may be considered corrosion free
from an oxygen or carbon dioxide stand point. Free air
or other non-condensable gases should be vented prior permitting
the fluid to enter the Deaerator.
Deaerator protects the feed pumps, piping, boiler and any other piece
of equipment that is in the boiler feed and return cycle from
the effects of corrosive gases i.e. oxygen and carbon dioxide, to a level
where they are no longer a corrosion factor.
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