A boiler is a closed vessel in which water or other fluid is heated. The heated or vaporized fluid exits the boiler for use in various processes or heating applications, including water heating, central heating, boiler-based power generation, cooking, and sanitation.
Types of Boilers:
Pot boiler or Haycock/Haystack boiler:
Flued boiler with one or two large flues
Fire-tube boiler with Water-tube firebox
The source of heat for a boiler is combustion of any of several fuels, such as wood, coal, oil, or natural gas. Electric steam boilers use resistance or immersion-type heating elements. Heat recovery steam generators (HRSGs) use the heat rejected from other processes such as gas turbine.
Treatment: Boiler water treatment is a type of industrial water treatment focused on removal or chemical modification of substances potentially damaging to the boiler. Varying types of treatment are used at different locations to avoid scale, corrosion, or foaming.
External treatment of raw water supplies intended for use within a boiler is focused on removal of impurities before they reach the boiler.
Internal treatment within the boiler is focused on limiting the tendency of water to dissolve the boiler, and maintaining impurities in forms least likely to cause trouble before they can be removed from the boiler in boiler blowdown.
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