Two Boiler Design Types

In the markets, the boilers encountered will be either of firetube or watertube design. In a firetube boiler, the combustion products from the burning fuel are conducted to the boiler flue outlet through flue passages (tubes) that are surrounded by water. The tubes may be arranged horizontally or vertically above the furnace. Sometimes baffles or turbulators are inserted in the tubes to control gas velocity and improve the heat transfer by forcing the hot gases into more intimate contact with the tube walls.

In a watertube boiler, the hot combustion gases are directed over the tubes in which the boiler water circulates. Metal or refractory baffles direct the gas flow to improve heat transfer.

Note:- This data is intended to give an overview of the major features of common boiler types, regardless of manufacturer.

Firetube Boilers | Watertube Boilers