A Steam generator or Boiler is usually a closed vessel which is made of steel. Its functions is to transfer the heat produced by the complete combustion of fuel (solid, liquid, gaseous) to water and ultimately to generate steam.
According to American Society of Mechanical Engineers (A.S.M.E) a steam generating unit or a boiler is defined as,
"A combination of apparatus for producing, furnishing or recovering heat together with the apparatus for transferring the heat so made available to the fluid being heated and vaporized"
(i) For generating of power in the steam engines or steam turbines.
(ii) In the textile industries for sizing and bleaching etc. and many other industries like as chemical industries, sugar mills.
(iii) For heating the buildings in the cold weather and for producing the hot water for hot water supply.
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