ID
Fan stands for induced draft fan. ID Fan is very important auxiliary of the
boiler in the thermal power plant. It is used to remove the waste gases from
the boiler after the combustion of the coal in the boiler. The ID Fan sucks the
gases from the boiler and releases to the outside environment after collection
of the ash and dust particles in the electrostatic precipitators through
the chimney. The ID fan creates the negative pressure so that the smoke inside
will be suck through the path provided. ID fan are synchronous motors and works
on the principle of VFD (Variable frequency drive)
A variable-frequency drive (VFD) (also termed adjustable-frequency drive,
variable speed drive, AC drive, micro drive orinverter drive) is a type of
adjustable-speed drive used in electro-mechanical drive systems to control AC
motor speed and torque by varying motor input frequency and voltage. The speed
of the fan should be varying depending on the supply of the air to the boiler
for combustion and always the boiler should maintain the negative pressure to
avoid the flame to come out of the boiler which is done by the ID fan.
Proper operation of ID Fan is very much important as the postive pressure
in boiler will reduce the life time of the boiler and flame will get out of the
boiler and also more negative pressure in the boiler will put off the
flame and interrupts the plant operation also leads to the reduction of life
time of the boiler.VFD is very much important to save a lot of energy as the speed of the
fan can be varied according to the demand, if VFD is not present and a fixed
speed device is used the speed will remain same even though the demand is not
there. This wastes a lot of power.
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