It is a horizontal, natural circulation, fire tube
boiler. It can produce steam at the rate of 7000 kg/hr. at a pressure of up to
2.5Mpa. Earlier it was used mostly in railways for traction.
CONSTRUCTION & WORKING
The boiler barrel is a cylindrical shell and
consists of a large number of flue tubes. The barrel consists of a rectangular
fire box at one end and a smoke box at the other end. The coal is introduced in
the fire box through the fire hole and is made to burn on the grate. Water is
filled into cylindrical boiler shell up to about ¾ levels. Hot gases generated
as a result of coal burning rise and get deflected by a fixed fire brick
lining. The hot flue gases heat the water and then reach the smoke box at tube
other end. Finally the flue gasses pass to the atmosphere through a short
chimney. The steam produced is stored in the steam space and the steam dome. A
throttle valve is provided in the steam dome.
The throttle valve is controlled by a regulating rod
from outside. For super heating, the steam passes through the throttle valve to
the super heater.
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