The single tank .005 cc/liter atmospheric deaerator is a complete factory assembled system. It offers simplicity in operation and service, and assures effective removal of oxygen to a level not to exceed .005 cc/liter. This system operates by mixing pumped returns and fresh water make-up and super heating them to 220 degrees F. in an external heat exchanger. The water is then admitted into the atmospheric storage tank through spring loaded spray nozzles for atomization. This fine mist will immediately flash to steam, resulting in the complete separation of oxygen and other non-condensable gases. The vapor then enters an externally mounted vent condenser. As the water falls to storage in the receiver, the oxygen and other gases are released through the unrestricted vent.
A level controller and valve admits fresh make-up as needed to maintain a minimum water level. Small quantities (up to 5%) of high temperature (over 212° F) gravity returns can be dropped directly in to the receiver through the top baffled opening. Other low temperature returns should be pumped at 15 psi minimum.
The DK5 split tank atmospheric deaerator provides one large receiver with an internal baffle that splits the tank into two sections. Make-up and low temperature returns (gravity or pumped) are brought back to the surge section. High temperature condensate is returned to the deaerator section. This system is very versatile and can be used in most applications that have a blend temperature of less than 180° F. With the split tank design, the need for a separate condensate set to pump back to the deaerator is eliminated because it can accept gravity returns.
A transfer pump is provided to constantly move water from the surge section to the deaerator section for heating. The water is heated to 220° F. through an externally mounted heat exchanger and then enters the receiver through spray nozzles. Excess water not used by the boilers overflows back and preheats the surge section. This also provides recirculation of the stored water in the deaerator section to ensure constant .005 deaeration. An internal vent condenser and spray bar in the surge section condenses the steam. The oxygen and noncondensable gases are vented to atmosphere. A valve with level controller is provided to admit fresh make-up as needed to maintain a minimum water level.
