Shell Water Fire Fire tube tube boiler is contained in small diameter tubes connected to water –Water system and hot gases come into contact with the external surface. Water High heating surface good overall thermal efficiency Efficiency is improved by - Super heater Economizer Air heaters Straight tubes for cleaning and replacement –Good b) Bent tubes flexible in heating surface layout. –More difficult to clean and –More replace c) Forced circulation and lighter tubes –Thinner efficiency –Increases compact –More Hot boilers Heating boiler (sectional boiler) Domestic boiler
Shell Water Fire Fire tube tube boiler –Water is contained in small diameter tubes connected to water system and hot gases come into contact with the external surface. Water High heating surface good overall thermal efficiency Efficiency is improved by - Super heater Economizer Air heaters Straight tubes –Good for cleaning and replacement b) Bent tubes –More flexible in heating surface layout. –More difficult to clean and replace c) Forced circulation –Thinner and lighter tubes –Increases efficiency –More compact Hot boilers Heating boiler (sectional boiler) Domestic boiler
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