What is deaerator principle?

Thermal deaeration relies on the principle that the solubility of a gas in water decreases as the water temperature increases and approaches its boiling point. Deaeration is done by spraying feedwater into a chamber to increase its surface area, and may involve flow over multiple layers of trays.

What are the types of deaerator?

There are two main types of boiler deaerators: tray-type, or cascade-type deaerators, and spray-type deaerators. The tray type features a vertical section that is domed and mounted to the top of a horizontal tank that stores the water for the boiler.

What is deaerator pegging steam?

A deaerator is typically a counterflow design that facilitates greater contact of the steam to the water, efficient heating and vigorous scrubbing of the water with the steam. Pegging steam, as it’s referred to in this application, is used for mechanical pressure deaeration.

How much steam does a deaerator use?

Therefore, based on practical experience, deaerator manufacturers will tend to recommend a venting rate of between 0.5 and 2 kg of steam/air mixture per 1 000 kg/h of deaerator capacity to be on the safe side.

How does a deaerator work in a power plant?

Deaerators work as a feed water heater, these feed water heaters are also called Deaerators, and they serve the dual purpose of heating the feed water to improve plant efficiency and deaerating the feed water to remove gases that could cause corrosion of equipment and piping systems.

How does a deaerator protect the steam system?

Deaerators are mechanical devices that remove dissolved gases from boiler feedwater. Deaeration protects the steam system from the effects of corrosive gases. It accomplishes this by reducing the concentration of dissolved oxygen and carbon dioxide to a level where corrosion is minimized.

What can a deaerator be used for in a boiler?

Dearator acts as an extra storage that provides reserve amount of boiler feed water throughout upstream water supply failure for momentary periods commonly for about twenty minutes. In some of the Plants, Deaerator is additionally used for dosing oxygen scavenging chemicals like hydrazine or Hydroquinone.

Where does the water go in a deaerator?

Tray type deaerators contain perforated trays within the top of the Deaeration section. The bottom portion volume is high for used as storage for boiler feed water. Feed water to deaerator enters into the perforated trays wherever the area and residence time is growing to contact with steam.