The process
Treatment plants evaporate reject streams with MVR, scrub odour from the tanks, and aerate biological stages with blowers. Corrosion resistance throughout.
The gas at the fan
Saturated vapour, often with dissolved solids and a low pH. Wetted parts in stainless steel, a shaft seal rated for the vapour, drain points and a casing designed for condensate.
Selection for this duty
| Blade form | Backward curved, in stainless steel, at the tip speed the pressure ratio demands |
| Material of construction | Stainless steel on all wetted parts, grade to suit the gas analysis |
| Drive and bearings | Direct coupled or belt driven; belt drive where the duty point may need tuning at site |
| Also specified | Casing drain at the lowest point |
| Density at the fan | At about 90°C the gas density is close to 0.97 kg/m³, 81% 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 water and wastewater treatment plants
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 PlantsFertilizer Rotary Dryers and CoolersSulphuric Acid PlantsFluid Bed Dryers and CoolersFlour and Grain MillsCarbon Black PlantsAsh Handling SystemsCaptive Power PlantsPneumatic Conveying SystemsSilo Aeration and FluidisationGlass 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.