A water tube marine steam boiler consists of a large number of
closely spaced water tubes connected to one or more drums, which act as water
pockets and steam separators, giving rapid water circulation and quick
steaming.
On their way to the funnel the flue gases from the boiler pass a superheater
and an economizer. In many marine boilers an air preheater is installed after
the economizer, to preheat the combustion air before it is blown into the
boilers' furnaces.
Other types of water tube boilers are
Babcock &
Wilcox boilers, Eckrohr boilers and
Yarrow boilers. A
special kind of water-tube boiler is the
forced-circulation boiler where the boiler water circulates
rapidly through the tubes by means of a pump.
- Smoke uptake
- Economizer
A heat exchanger that transfers heat from Boiler Flue Gases to Boiler
Feedwater.
- Steam Outlet
Saturated steam from the Steam Drum to the Superheater
- Cyclone
A device inside the drum that is used to prevent water and solids from passing
over with the steamoutlet.
- Stay tube
for superheater
- Stays
for superheater tubes
- Superheated steam outlet
- Superheater
A bank of tubes, in the exhaust gas duct after the boiler, used to heat the
steam above the saturation temperature.
- Superheater Headers
Distribution and collecting boxes for the superheater tubes.
- Water Drum
- Burner
- Waterwall Header
Distribution box for Waterwall and downcomers.
- Footing
It is a prop that supports the entire boiler.
- Membrane-Panel
A water-wall. Normally used as furnace walls.
- Waterwall Header
Distribution box for Waterwall and downcomers.
- Back side Waterwall
- Boiler hood
- Waterwall Header
Collecting box for Waterwall and risers.
- Riser
The water-steam emulsion rises in these tubes toward the steamdrum.
- Downcomer
A tube through which water flows downward. These tubes are normally not heated,
and the boiler water flows through them to supply the generating tubes.
- Steam Drum
Separates the steam from the water.
- Economizer Header
Distribution box for the economizer tubes.
|
