What the fans do here
Tobacco processing generates fine dust from cutting, drying and blending. Bag filter fans on the dust extraction system are the main duty, with cyclones as pre-collectors. Dryer exhaust and general ventilation complete the set.
Applications in this industry
| Application | What it does | Type usually selected |
|---|---|---|
| Dust Collector Fan | The fan behind a bag filter, cyclone or multiclone on a dust extraction system. Placed on the clean side where possible so the blade can be chosen for efficiency. | Backward inclined and radial tipped |
| Hot Air Fan | Circulates or supplies air at elevated temperature to a dryer, oven or kiln. Selected at the hot density with the shaft and bearing arrangement built for continuous hot running. | Backward curved and backward inclined |
| Ventilation Fan | Moves air through a plant or building for fresh air supply, heat removal and fume dilution where the system is ducted. Low pressure, long hours, so efficiency and noise set the selection. | Backward inclined and forward curved |
| HVAC | Supply, return and exhaust fans for heating, ventilation and air conditioning of plant and office space. Low pressure, so efficiency and noise govern. | Axial, backward inclined and forward curved |
Processes in this industry
Equipment supplied
Bag Filter
Fabric filters in polyester, polypropylene, Ryton and Nomex. Efficiency to 99.9% down to 5 micron.
Centrifugal Fans
0.3 to 120 m³/s, 25 to 3120 mmWC single stage. Six blade configurations, three drive arrangements.
Cyclonic Separator
Coarse dust pre-collector. Low cost, low maintenance, low pressure drop. To 90% down to 30 micron.
Axial Fans
0.3 to 70 m³/s, 3 to 75 mmWC. Direct drive, belt drive and bifurcated. Fixed or variable pitch impellers.
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.