The process
The dry process kiln line is a chain of fans from the cooler to the stack. The preheater fan sets the kiln draft through the cyclone stages, the raw mill fan draws the hot gas through the mill, the cooler fans blow and exhaust the clinker bed, and the coal mill fan carries pulverised fuel to the burner. Every gas stream carries abrasive dust at temperature.
The gas
Kiln gas leaving the preheater carries fine raw meal dust at high temperature. The fan runs hot and dusty for years between stops, so wear liners, a shaft cooling disc and bearings outside the gas path are standard.
Selection for this process
| Type | Guillotine for isolation, multi louver or butterfly for control, diverter where the gas is switched between two paths |
| Material | SS 310 or SS 316 for gas above 300°C or corrosive |
| 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 cement preheater kilns
Preheater FanRaw Mill FanCoal Mill FanCooler ID FanCooler Vent FanCooler Compartment FanShell Cooling FanAir Slide BlowerBag Filter FanDust Collector FanHigh Pressure Blower
Dampers in other processes
Waste Heat Recovery BoilersVertical Roller Raw MillsClinker 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.