Boiler Technologies: Firetube and Watertube Boilers
boilers can be classified as either firetube boilers or watertube
boilers. Both styles are compact, easy to install, can be
set up for dual fuel capability and last many years.
firetube boiler is a vessel where the flame is contained in
the furnace and the hot combustion gases pass through straight
tubes. Combustion occurs within the furnace and the flue gases
exhaust through the tubes to the exhaust stack outlet. The
furnace and tubes sit in a Iarger shell which contains the
boiler water. Firetube boilers are built similarly to a shell-and-tube
furnace and tubes transfer heat to the water. The large number
of tubes results in more heating surface and greatly improves
heat transfer and efficiency. Firetube boilers are available
for low or high-pressure steam and hot water applications.
the watertube boiler the tubes contain the boiler water and
the products of combustion pass around the tubes. Typically,
watertube designs consist of multiple drums. A steam drum
(upper) and mud drums (lower) are connected by the tubes,
which form both the convection section and the furnace area.
Commercial watertube boilers typically produce hot water for
commercial or modest-size applications.
Firetube Boilers - Up to 3000 hp
Watertube Boilers - Small packaged systems up to about 7,500
Ranges from 75% - 85%