The process
Carbon black is unloaded, conveyed and weighed into the mixers under extraction, with bag filters on every transfer. The fans sit on the clean side with sealed bearings, because the dust penetrates everything.
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. |
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. Client-stated blade types for the Ventilation Fan in general: Backward inclined and forward curved.
Industries
Other fans in tyre plant mixing and carbon black handling
Ventilation Fan in other processes
Bagasse Fired BoilersRice Husk Fired BoilersAFBC BoilersCFBC BoilersPulverised Coal Fired BoilersOil and Gas Fired BoilersBiomass Fired BoilersCement Packing and DispatchElectric Arc Furnace SteelmakingInduction Furnace Melt ShopsHeat Treatment FurnacesForge ShopsAluminium Smelters and Cast HousesIron and Non-ferrous FoundriesGlass Forming and Annealing LehrsBrick and Refractory KilnsChemical Reactor and Tank VentsMVR EvaporatorsEffluent Treatment and Zero Liquid Discharge PlantsPharmaceutical Clean RoomsSolvent Recovery PlantsGas Compressor StationsBelt and Tray DryersTea Withering Troughs
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.