Centrifugal Fans / Blowers

As Equipment Centrifugal Fan or Blower is a rotary bladed machine delivering continuous flow of air / gas against system resistance / pressure under centrifugal force. In accordance with its application or site condition it can be designed and named differently as ID Fan, FD Fan, PA Fan, SA Fan, Booster Fan, Ventilation Fan, Steam Exhaust Fan, Sinter Fan, Raft Cooling Fan, Re-circulation Fan, Tertiary Air Fan, Raw Mill Fan, Cooler Fan, Bag Filer ID Fan, De-dusting Fan, Hot Air Fan, Shell Air Fan, ABC Fan, Nose Cooling Fan, Combustion Air Fan, Fume Extraction Fan, Seal Air Fan, Coal Mill Fan, Cement Mill Fan, Separator Fan, ESP Exhaust Fan, Pre-heater Fan and so on…

Each Centrifugal Fan has definite Characteristic Curve of Flow Vs. Pressure. Every Centrifugal fan is selected on the Duty Point which is the intersection point of fan characteristic curve & the system resistance curve.

Duty Parameters of a Centrifugal Fan, as offered by Maxflow:

Air Flow Volume : up to 15,00,000 M³/Hr.
Static Pressure : up to 2,500 mmWG
Temperature : up to 500° C
(Note: The above maximum values cannot be achieved simultaneously.)

Centrifugal Fans can be of various types as per requirement and application like:

Forward Curved Bladed (1)

:Low Efficiency (60 – 70%)

Radial Bladed (2) Suitable for Heavy Abrasive Dusty Application

:Low Efficiency (50 – 60%),

Backward Inclined Bladed (3) Suitable for Dusty Application

:High Efficiency (70 – 80%)

Backward Curved Bladed (4,5)

:High Efficiency (70 – 85%)

Backward Aerofoil Bladed (6) Suitable for Clean Air Application

:High Efficiency (80 – 90%)


Fan Control Devices for Duty Regulation

A) Damper Control :-

Note : However, this throttling lowers the efficiency.

B) Speed Control :-

Note: Speed Control through belt drive & VFD are the efficient mode of control whereas efficiency is lowered when Fluid Coupling is used.