The process
Direct reduction of iron ore in a rotary kiln produces a hot off-gas full of fines that passes through an after-burner chamber and usually a waste heat boiler before the ESP and the ID fan. Shell air fans along the kiln inject air through ports, and shell cooling fans protect the refractory. Hard, continuous duties.
The gas
Rotary kiln off-gas after the after-burner chamber and waste heat boiler, carrying iron ore and coal fines. Among the harder duties for an ID fan: hot, heavily dust laden and continuous.
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 sponge iron rotary kilns
ID FanCombustion Air BlowerShell Cooling FanDust Collector FanBag Filter FanDilution Air BlowerHot Air Fan
Dampers in other processes
Waste Heat Recovery BoilersCement Preheater KilnsVertical Roller Raw MillsClinker Grate CoolersRotary Lime 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.