www.saVRee.com Deaerators Explained| pg. 6
Tray Deaerator Connections
A pressurized deaerator will operate at approximately 5 psi at 230°F (imperial), or 0.4
bar at 105°C (metric). Deaerator feedwater will be maintained as close to the saturation
temperature as possible in order to reduce the level of dissolved gases as much as
possible, but without the water changing phase to steam. If the feedwater exceeds its
saturation temperature, it will begin to form steam and will either condense, or be vented
to atmosphere, both of which are not desired.
How Deaerators Work
There are two common deaerator designs, spray and tray (spray-tray). Each design has
its own operating characteristics. Regardless of the design employed, both deaerators
designs:
•
Maximize the contact surface area between the water and steam to obtain a
high heat transfer rate.
•
Rely upon direct contact between the steam and water (usually tray, spray,
bubbling, or a combination of these).
•
Employ spray nozzles.
•
Utilize steam as the heat source.
•
Agitate the water using steam.
•
Can be mounted onto the top of a feedwater storage tank.
•
Are often manufactured from the same materials.
•
Are open/vented to atmosphere.