The process
Carbon black reactors, quench and main bag filters handle the product itself as a fine, adhesive dust. The main process fan after the bag filter and the dryer and conveying fans all need sealing against the dust.
The gas at the fan
Carbon black is extremely fine, adhesive and penetrating. The fan is on the clean side of a bag filter, with seals that keep the dust out of bearings and a wheel that can be cleaned.
Selection for this duty
| Blade form | Straight radial, open or shrouded, so the wheel can be cleaned and does not hold deposit |
| Material of construction | Mild steel |
| Drive and bearings | Direct coupled or belt driven; belt drive where the duty point may need tuning at site |
| Also specified | Access doors on the scroll and a wheel that can be cleaned in place |
| Density at the fan | At about 60°C the gas density is close to 1.06 kg/m³, 88% 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. |
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. Client-stated blade types for the Hot Air Fan in general: Backward curved and backward inclined.
Industries
Other fans in carbon black plants
Hot Air Fan in other processes
Hot Air GeneratorsBall Mill Raw GrindingCement Grinding MillsCement Plant Coal MillsGypsum Calcining PlantsSponge Iron Rotary KilnsSteel Reheating FurnacesHeat Treatment FurnacesForge ShopsAluminium Smelters and Cast HousesHot Dip Galvanising LinesGlass Melting FurnacesGlass Forming and Annealing LehrsCeramic Tunnel and Roller KilnsCeramic Body Spray DryersBrick and Refractory KilnsEffluent Treatment and Zero Liquid Discharge PlantsSolvent Recovery PlantsFertilizer Granulation PlantsFertilizer Rotary Dryers and CoolersFood and Dairy Spray DryersRotary DryersFluid Bed Dryers and CoolersBelt and Tray Dryers
Services on this fan
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.