Primary air fan also called as the PA fan is the considered
the most important part of the boiler in the thermal power plant. In a thermal
power plant where there are two PA fan , two FD fan and two ID fans are present
and if any one of the ID fan or FD fan is tripped off, then by maintaining the
air flow the unit can be saved and kept in running status. But if any one PA
fan goes off it will be difficult to save the plant. This is the importance of
the PA fan.
Primary air fan starts from along the mills area of the
boiler and flows all the way to the boiler. While moving from the mills to the
boiler it carries the fine particles of the coal which is powdered in the mills
to the boiler and supplies the much needed fuel for the thermal power plant.
The amount of fuel flow to the boiler depends on the proper working of the
primary air fan.
Primary air fan is used to supply cold air and hot air. The
air to be supplied depends on the condition of the coal. If wet coal got
powdered in the mill, as the wet coal is of heavy weight it cannot be carried
easily to the boiler. So hot air is also provided to the mills area to dry the
wet coal and carry the coal to the boiler. Thereby reducing the wastage of the
coal.
A loss in the PA fan
for a live plant (if two PA)will cut off the fuel flow to the boiler and it
will not provide sufficent time to the operators to handle the plant as it
almost cuts half of fuel and as the reaction time is minute the unit cannot be
saved.
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