Definition of boiler systems Boiler system is a system that is used to heat water and to generate required steam or hot water. The boiler system is generally composed of the following units: (a) Feedwater treatment unit: demineralizer, etc. In case that the raw water is supplied from a river, a lake and so on, the raw water treatment units (clarifier, filter,etc.) are required. (b) Feedwater line, (c) Deaerator, (d) Boiler including preheater, superheater and desuperheater, (e) Steam and condensate line, (f) Condensate treatment unit, (g) Wastewater treatment unit, (g) Chemical injection unit. Classification of boilers by their structures (1) Cylindrical boilers (pressure : below 20 kgf/cm 2 ) : (a) Vertical boilers, (b) Flue-tube boilers, (c) Fire-tube boilers, (d) Fire and flue-tube boilers. (2) Water-tube boilers : (a) Natural circulation boilers (pressure : low to high), (b) Forced circulation boilers (pressure : low to high), (c) Once-through boilers (pressure : above 75 kgf/...
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