THE
THREE
PASS
CONSTRUCTION
OF
A TYPICAL
CBW
BOILER
(CBWlOO
through
200
Boiler Horsepower
Shown)
Combustion air enters through the air inlet. The forced draft fan forces air through the rotary air
damper and diffuser into the combustion chamber. The main combustion chamber or main
firetube constitutes pass one. A combustion turnaround section directs the gases into the second
pass tubes. The turnaround section
is
contained within the pressure vessel, completely covered
with water, giving the design name
"WETBACK." Gases are directed from the second to the
third pass at the front
of
the boiler and finally exit out the vent at the rear
of
the boiler.
iii
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