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Tekenening van een Waterpijp Ketel / Drawing of a Water Tube Boiler
Source : Lars Josefsson
Drawing of a Water Tube Boiler.
( Copyright Lars Josefsson )
A water tube 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, Eckrohr and Yarrow boilers.
Explanation :
A. Smoke uptake.
B. Economizer
A heat exchanger that transfers heat from Boiler Flue Gases to Boiler Feedwater.
C. Steam Outlet
Saturated steam from the Steam Drum to the Superheater.
D. Cyclone
A device inside the drum that is used to prevent water and solids from passing over with the steamoutlet.
E. Stay tube
for superheater.
F. Stays
for superheater tubes.
G. Superheated steam outlet
H. Superheater
A bank of tubes, in the exhaust gas duct after the boiler, used to heat the steam above the saturation
temperature.
I. Superheater Headers
Distribution and collecting boxes for the superheater tubes.
J. Water Drum
K. Burner
L. Waterwall Header
Distribution box for Waterwall and downcomers.
M. Foting
N. Waterwall
Tubes welded together to form a wall.
O. Waterwall Header
Distribution box for Waterwall and downcomers.
P. Back side Waterwall
Q. Boiler hood
R. Waterwall Header
Collecting box for Waterwall and risers.
S. Riser
The water-steam emulsion rises in these tubes toward the steamdrum.
T. 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.
U. Steam Drum
Separates the steam from the water.
V. Economizer Header
Distribution box for the economizer tubes.
Source : Lars Josefsson
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