Fans and Air Pollution Control for Rice Mills and Paddy Dryers

The process

Paddy dryers are fired with husk in a furnace or hot air generator, with the hot air fan supplying the dryer and cyclones taking husk dust from the milling section. Husk ash and husk dust are both abrasive.

The gas

Rice husk ash is high in silica and among the most abrasive fly ashes a boiler fan handles. Blade wear is the limiting factor; wear liners, hard facing and a blade form that resists erosion set the design.

Fans in this process

Duty	What it does here	Type usually selected
Hot Air Fan	Circulates or supplies air at elevated temperature to a dryer, oven or kiln.	Backward curved and backward inclined
ID Fan	Sits at the outlet of a boiler, kiln or furnace and draws the flue gas through the plant to the stack.	Backward curved, backward inclined and radial tipped
Dust Collector Fan	The fan behind a bag filter, cyclone or multiclone on a dust extraction system.	Backward inclined and radial tipped
Bag Filter Fan	Pulls the process gas through the filter bags and discharges the cleaned gas to the stack.	Backward curved and radial tipped
Combustion Air Blower	Feeds a burner with air at the pressure the burner register needs.	Backward curved and radial tipped
Ventilation Fan	Moves air through a plant or building for fresh air supply, heat removal and fume dilution where the system is ducted.	Backward inclined and forward curved

Air pollution control

Industries

Related processes