The process
The coal mill dries and grinds fuel for the kiln burner with hot gas drawn from the preheater or cooler. The mill fan handles gas carrying pulverised coal and is built spark resistant, with seal air keeping dust out of the bearings and a bag filter on the fine coal bin vent.
The gas
Gas carrying pulverised coal is combustible. Spark resistant construction with non-ferrous rubbing parts, a shaft seal and earthing of all components are required, with explosion relief on the system.
Fans in this process
| Duty | What it does here | Type usually selected |
|---|---|---|
| Coal Mill Fan | Draws hot gas through the coal mill to dry and convey the pulverised coal to the burner or the fine coal bin. | Backward curved and radial tipped |
| Seal Air Blower | Supplies clean air at a pressure above the mill or fan casing pressure to the shaft seals and bearing housings, so pulverised coal cannot enter.. | Backward curved and radial |
| Bag Filter Fan | Pulls the process gas through the filter bags and discharges the cleaned gas to the stack. | Backward curved and radial tipped |
| Hot Air Fan | Circulates or supplies air at elevated temperature to a dryer, oven or kiln. | Backward curved and backward inclined |
| Dust Collector Fan | The fan behind a bag filter, cyclone or multiclone on a dust extraction system. | Backward inclined and radial tipped |
Industries
Related processes
Waste Heat Recovery BoilersCement Preheater KilnsVertical Roller Raw MillsBall Mill Raw GrindingCement Grinding MillsClinker Grate CoolersCement Packing and DispatchRotary Lime KilnsVertical Shaft Lime KilnsGypsum Calcining PlantsRotary DryersMineral Crushing and ScreeningCaptive Power PlantsPneumatic Conveying SystemsSilo Aeration and FluidisationAlternative Fuel Handling in Cement Plants