There have been so many. And there will continue to be so many detailed accounts on how a standard or custom prepared spray type deaerator and tray type deaerator works and for what specific purpose it has been prepared. If this is all news to you, then take in this very brief characterization of the deaerator, one of many, more than likely.
Corrosion within boiler cycles are caused by non-condensable gases, oxygen and carbon dioxide being two such regular examples. Of course, these non-condensable gases need to be removed. This is done when feed water is heated and is vigorously scrubbed by a counter current flow of steam. The deaerating process works against the grain. Incoming un-deaerated water goes into a deaerator through spring loaded stainless steel spray valves. The valves produce fine sprays in uniform patterns.
Droplets of water produced are fine. They maximize the surface areas in contact with the produced steam. Temperatures are raised to within degrees of required saturation temperatures. The result of this is the instant release of a majority of collected corrosive and non-condensable gases. Both pre-heated and partially deaerated water flows through a tray stack. It is here where the hottest and purest steam vigorously scrubs water in order to heat it to its required saturation temperature, stripping out the last remnants of dissolved gases.
Deaerating processes are carried out within a stainless steel enclosure. This enclosure eliminates the need for cladding or vessel lining procedures. Affected equipment or products are given longer lifespans when they are cleaned of corrosive gases and similarly destructive elements. The deaerator, when in operation, barely makes a sound. Product manufacturers have given their clients guaranteed performances over wide load swings.
Here is hoping that this brief characterization was of some value to you.