This deaerator will be made up as a horizontal or vertical vessel cylindrical in shape. The standard spray type deaerator now serves as a deaerating section as well as a boiler feed-water storage tank. The typical deaerator with its horizontal cylindrical tank contains a preheating compartment to go along with the deaerating section.
Both these sections will be separated by a baffle. Low pressure steam will be entering the vessel through a sparger. This component is located at the bottom of the operating equipment. All boiler feed-water will be sprayed into a compartment where it will subsequently be preheated by rising steam emanating from the sparger.
The feed-water spray nozzle and the system’s preheating section are required to heat incoming boiler feed-water to a saturation temperature. This is required to facilitate the stripping out of dissolved gases that will occur in another deaerating section. Preheated feed-water flows into a deaerating section.
Steam deaerates the preheated feed-water. This steam rises from the sparger system. Gases are stripped out of a water exit via a vent located at the top of the system. The deaerated boiler feed-water will be pumped from the bottom of the vessel to a steam generating boiler system. There is an alternative to the spray type deaerator.
This is the tray type deaerator. This deaerator is also known as a cascade type deaerator. It is also vertically and dome shaped. And it will be mounted at the top of a horizontally lying cylinder. The cylinder operates as the deaerated boiler feed water storage tank. All boiler feed-water enters a vertical deaeration chamber located above perforated trays.
Water then flows down through these perforations. Low pressure deaeration steam will then enter below these trays. It then flows upwards through the perforations.