The process
Packing plants raise cement dust at the packer spouts, bag loading and truck loading points. Dust extraction fans pull the air into bag filters, and air slide blowers feed the packers from the silos.
The gas at the fan
Ambient air carrying light dust from the surroundings, enough to settle on blades over months but not to erode them. Inlet screens and a wheel that sheds deposit are the usual precautions.
Selection for this duty
| Blade form | Backward inclined or backward curved; the residual dust does not justify a radial wheel |
| 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 cement packing and dispatch
Air Slide Blower in other processes
Cement Preheater KilnsVertical Roller Raw MillsBall Mill Raw GrindingCement Grinding MillsGypsum Calcining PlantsAsh Handling SystemsPneumatic Conveying SystemsSilo Aeration and FluidisationGlass 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.