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The treated water falls into a storage tank below the deaerator. [20] [3] Oxygen scavenging chemicals are very often added to the deaerated boiler feedwater to remove any last traces of oxygen that were not removed by the deaerator. The type of chemical added depends on whether the location uses a volatile or non-volatile water treatment program.
Deaeration is the removal of air molecules (usually meaning oxygen) from another gas or liquid. It can refer to: Use of a deaerator. Degasification, the removal of dissolved gases, such as oxygen, from liquids.
Water aeration is the process of increasing or maintaining the oxygen saturation of water in both natural and artificial environments. Aeration techniques are ...
Boiler feedwater is the water which is supplied to a boiler. The feed water is put into the steam drum from a feed pump. In the steam drum the feed water is then turned into steam from the heat. After the steam is used, it is then dumped to the main condenser. From the condenser, it is then pumped to the deaerated feed tank.
The bacteria that cause cholera, typhoid and dysentery can thrive in "natural" water, meaning raw water could equal a long trip to the toilet at best—and the hospital at worst.
The steam heats the water in the tank; The water in the tank serves as a surge volume within the steam plant. The deaerating feed tank's surge volume allows the ship to change "bells" (steam turbine power output) and change the ship's speed without running the feed pump dry or flooding the turbines with liquid water.
Degassing, also known as degasification, is the removal of dissolved gases from liquids, especially water or aqueous solutions. There are numerous methods for removing gases from liquids. Gases are removed for various reasons.
Desulphated water flows to the top of the deaerator column, this operates at a partial vacuum (0.3 bara) sustained by the deaerator vacuum unit. The deaerator internals comprise three packed beds. Deaerated water is taken from the base of the deaerator by transfer pumps which deliver 1632 m 3 /hr at 3.6 barg to the degasser surge drum. [4]