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A feedwater heater is a power plant component used to pre-heat water delivered to a steam generating boiler. [ 1 ] [ 2 ] [ 3 ] Preheating the feedwater reduces the irreversibilities involved in steam generation and therefore improves the thermodynamic efficiency of the system. [ 4 ]
Deaeration can be accomplished by using deaerator heaters, vacuum deaerators, mechanical pumps, and steam-jet ejectors. In deaerating heaters, steam sprays incoming feed water and carries away the dissolved gases. The deaerators also store hot feed water which is ready to be used in the boiler.
Appliances that provide a continual supply of hot water are called water heaters, hot water heaters, hot water tanks, boilers, heat exchangers, geysers (Southern Africa and the Arab world), or calorifiers. These names depend on region, and whether they heat potable or non-potable water, are in domestic or industrial use, and their energy source.
In 1899, George M Kleucker received a patent for an improved method of de-aerating water. [8] Two sister ships, Olympic and Titanic (1912), had contact feed heaters on board. [9] In 1934 the US Navy purchased an atomizing deaerator. [10] During the 1920s the feedwater heaters and deaerators designs improved. [11] [12] [13]
Feed water for boilers needs to be as pure as possible with a minimum of suspended solids and dissolved impurities which cause corrosion, foaming and water carryover. The most common options for demineralization of boiler feedwater are reverse osmosis (RO) and ion exchange (IX).
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