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Spray-Tray type Deaerators |
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Functions: |
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Removing the dissolved
gases to prevent corrosion |
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Feed water heating |
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Feed water storage |
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Increasing thermal
efficiency |
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Providing required NPSH
for feed water pump |
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FAP DEAERATORS CHARACTERISTICS |
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The contact surface in FAP deaerators is
maximized by the use of spray nozzle(s) and duration of
contact is optimized in the heating trays. Heating of water
is accomplished by direct contact of the water and the
steam.
The solubility of a gas depends on the Temperature of the
water and the partial pressure of the gas in contact with
the water. When the temperature of the water is at the
boiling point for the operating pressure, the solubility of
the gases will be zero.
Repeated agitation and breaking up of the water by passing
it through sprays and over trays and also through a steam
atmosphere, which is maintained by venting, causes rapid
diffusion and elimination of the gases. |
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Vacuum Deaerators
Vacuum type deaerators are used to obtain a very
efficient carbon dioxide removal as well as a good oxygen
removal from demineralized water. Single or multiple stages
vacuum deaerators are available.
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Outlet
water temperature