The process
A vertical roller mill grinds and dries raw meal in one body, with hot kiln gas drawn up through the table and separator by the mill fan. The fan carries the full product stream to the bag filter or cyclones, so the dust load is the heaviest on the line and the wheel is built for wear.
The gas
Hot gas that has dried the raw meal and now carries the fine product toward the separator and collector. Very heavy fine dust loading; the impeller is built for wear and balanced to tolerate build-up.
Selection for this process
| Type | Guillotine for isolation, multi louver or butterfly for control, diverter where the gas is switched between two paths |
| Material | Mild steel |
| Sealing | Seal air arrangement where tight shut-off is needed on hot or dusty gas |
Types, construction and performance of the dampers.
Industries
Fans in vertical roller raw mills
Dampers in other processes
Waste Heat Recovery BoilersCement Preheater KilnsClinker Grate CoolersRotary Lime KilnsSponge Iron Rotary KilnsBlast Furnace Hot Blast StovesSinter PlantsElectric Arc Furnace SteelmakingLadle Furnaces and Secondary MetallurgySteel Reheating FurnacesFerro Alloy Submerged Arc FurnacesCopper and Zinc SmeltingGlass Melting FurnacesCeramic Tunnel and Roller KilnsWaste IncineratorsRefinery Fired HeatersNuclear Facility VentilationBOF Steel ConvertersIron Ore Pellet Plants
Information needed to select or quote
- Gas volume and temperature. Actual flow at the inlet, normal and upset temperature, moisture.
- Dust or pollutant. Inlet loading, particle size distribution, whether it is abrasive, sticky, hygroscopic or combustible; for gases, the species and concentration.
- Required outlet. The emission limit or clean gas concentration the unit must meet.
- Site. Available space and height, material of construction preferences, and how the collected material is to be discharged.