www.saVRee.com Deaerators Explained pg.
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How Spray Deaerators Work
Condensate and makeup water enter the water box directly above the spray nozzles; the
spray nozzles are spring loaded. Water pressure causes the nozzles to open and water is
sprayed into the deaerator. Spraying the water into the deaerator ensures a large contact
surface area between the water and steam, which ensures good heat transfer between the
two fluids (fluids are defined as either liquid or gas).
Spray Scrubber Deaerator
Water exits the nozzles and passes through a large perforated circular tray before joining
the water in the feedwater tank. A submerged steam sparge/sparger pipe distributes
steam to the preheating and deaeration sections of the deaerator. The steam heats the
water to within 2°C (approx. 4°F) of its saturation temperature to ensure as many
condensable gases are liberated from the water as possible.
The heated water then passes around a baffle plate to reach the deaeration section, and
is discharged as heated, deaerated, feedwater.
How Spray Scrubber Deaerators Work
Spray scrubbers function in a similar manner to spray deaerators, but they have a
scrubber installed. Water enters a water box, is sprayed through spray nozzles, then drains
through a tray and is directed to a scrubber.
Scrubbers utilise steam to agitate (using steam bubbles) and heat water after it leaves the
spray area of the deaerator. Close contact with the steam ensures good heat transfer and