Sellers .005 deaerators are designed to heat boiler feedwater and to reduce oxygen and CO2 to less than .005 cc/liter of water. This treatment protects the boiler and reduces corrosion. Single tank pressurized deaerators economically handle these requirements over a wide range of flow rates and temperatures.
Pumped return condensate and fresh make-up water are injected into the steam chamber to be pre-heated and partially deaerated. Further heating and scrubbing by steam impingement complete the process to provide .005 cc/liter quality water. Oxygen and CO2 are vented through manual and automatic vents. Pressurized systems also are particularly adept at handling high temperature condensate. Large quantities (over about 10%) of high temperature condensate (over 227° F.) should be introduced through an optional under water injection tube.
Split tank deaerators provide one large ASME tank with an internal baffle to split the tank into two sections. High temperature condensate above 227° is returned to the deaerator section. Pumped low temperature condensate and fresh make-up water go to the surge section. First step deaeration occurs in the surge section as the mixture is sprayed into 8 psi steam.
A transfer pump moves the mixture to the deaerator section where steam impingement further heats, agitates and scrubs the water. Excess water overflows the internal baffle into the surge section to be mixed with and preheat the make-up and returns. Boiler feed pumps force hot deaerated water from the deaerator section to the boilers.
