Corrosion that forms in boiler cycles is caused by the presence of non condensable gases such as oxygen and carbon dioxide through the feed of water within the boiler. The non condensable gases must be removed. To do this effectively a spray type or tray type deaerator will be used. Through these deaerators, feed water needs to be heated. While water is being heated it is scrubbed vigorously by a flow of stream that runs counter the feed of water within the tray type deaerator.
Incoming un-deaerated water is entering the deaerator through spring loaded, stainless steel spray valves. The valves is producing a fine spray in a uniform pattern that is varied in accordance with volume feed loads. The fine droplets of water produced maximize the surface area in contact with steam. This raises the temperature to within the required degrees of saturation temperature. Once this requirement is met, a majority of corrosive and non-condensable gases can be removed.
All preheated and partially deaerated water will flow through a tray stack. This is where the hottest and purest steam scrubs water vigorously in order to heat it to its required saturation temperature whilst stripping out its last traces of dissolved gasses. The entire deaeration process takes place in a stainless steel enclosure. This eliminates any need for cladding or vessel lining. It is also a useful advantage in prolonging machinery life and with very little maintenance work being required.
All waste materials need to be collected at some point and it is always hoped by cost conscious industrialists and their watchful authorities that this is being done as sustainably as possible. In closing this short note with an anecdote of sorts, it is hoped that the information has been useful to new readers.