The process
Cement, fly ash and flour silos are aerated through fabric at the cone to keep the material flowing. Air slide blowers supply low pressure aeration air, with bag filters on the silo vents.
The gas at the fan
Clean ambient air at site temperature. Density is close to standard and the fan is selected on efficiency and noise with no allowance for dust or corrosion.
Selection for this duty
| Blade form | Backward curved or aerofoil for the best efficiency on clean gas |
| Material of construction | Mild steel |
| Drive and bearings | Direct coupled or belt driven; belt drive where the duty point may need tuning at site |
| Density at the fan | At about 35°C the gas density is close to 1.15 kg/m³, 95% of standard air. Pressure developed and power drawn fall in the same ratio, so the selection is made at this density and the motor is checked at cold start. |
Supplies low pressure aeration air to the fabric of an air slide, fluidising cement, raw meal or gypsum so it flows down the slide. Client-stated blade types for the Air Slide Blower in general: Backward curved and radial tipped.
Industries
Other fans in silo aeration and fluidisation
Air Slide Blower in other processes
Cement Preheater KilnsVertical Roller Raw MillsBall Mill Raw GrindingCement Grinding MillsCement Packing and DispatchGypsum Calcining PlantsAsh Handling SystemsPneumatic Conveying SystemsGlass Batch Houses
Information needed to select or quote
- Duty point. Volume flow and static pressure at the fan inlet, with the gas density and temperature or the conditions to derive it.
- Operating conditions. Site altitude, normal operating temperature and continuous or intermittent duty.
- Gas stream. Dust loading and particle size, corrosive species, moisture, upset temperature and any tendency of the material to deposit on the impeller.
- Mechanical. Rotation viewed from the drive end, discharge orientation and motor power.