Tray Type Pressurized Deaerator - Operation

Makeup water and pumped returns are sprayed into the deaerator tray section through a stainless steel spray nozzle. The spray nozzle provides a thin conical sheet of water that condenses the vapors while permitting oxygen to exit through the vent. The partially deaerated water then begins to cascade through the trays.

The combined makeup and pumped returns are heated with steam that flows upward through the stainless steel trays. The steam vigorously scrubs the dissolved oxygen from the makeup and pumped returns. The trapped returns enter the deaerator storage section. Steam from the returns also flows upward through the deaerator trays, while the water drops to the water level in the deaerator storage section.

The fully deaerated water remains in the deaerator storage section for use by the boiler, while the excess steam flows into the deaerator tray section. Non-condensable gases enter the vent and pass to the atmosphere.