The process
The rotary dryer takes hot air from a furnace and the cooler takes ambient air, both through the product bed with exhaust fans that pull the dust-laden air through cyclones and scrubbers.
The gas at the fan
Dryer exhaust with heavy carry-over of the dried material and the moisture it gave up. Dust goes to a cyclone and bag filter, and the fan behind them handles warm, wet gas with residual fines.
Selection for this duty
| Blade form | Radial tipped with wear liners, or straight radial where the dust is coarse |
| Material of construction | Mild steel with replaceable wear liners on the blades and the scroll at the cut-off, with a casing drain for the moisture |
| Drive and bearings | Direct coupled or belt driven; belt drive where the duty point may need tuning at site |
| Also specified | Hard facing or liners on the blade pressure face; casing drain at the lowest point |
| Density at the fan | At about 120°C the gas density is close to 0.90 kg/m³, 75% 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. |
Delivers combustion, aeration and conveying air where the system resistance runs to several thousand millimetres of water column in a single stage. Client-stated blade types for the High Pressure Blower in general: Backward curved and radial tipped.
Industries
Other fans in fertilizer rotary dryers and coolers
High Pressure Blower in other processes
CFBC BoilersCement Preheater KilnsVertical Roller Raw MillsCement Grinding MillsVertical Shaft Lime KilnsGlass Melting FurnacesGlass Forming and Annealing LehrsFertilizer Granulation PlantsSulphuric Acid PlantsFluid Bed Dryers and CoolersFlour and Grain MillsCarbon Black PlantsAsh Handling SystemsCaptive Power PlantsPneumatic Conveying SystemsSilo Aeration and FluidisationWater and Wastewater Treatment PlantsGlass Batch HousesGas Based DRI PlantsSugar Dryers and SulphitationAnimal Feed MillsAlternative Fuel Handling in Cement Plants
Services on this fan
Fan and System Performance TestingRetrofit of Low Efficiency FansRotor Replacement and Performance EnhancementDynamic Balancing and Vibration AnalysisCondition Monitoring and TroubleshootingInstallation, Commissioning and After-sales Support
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.