The process
Reheating furnaces for rolling mills burn gas or oil with preheated combustion air from a recuperator. The combustion air blower is sized for the burner pressure at the hot air temperature, and the flue fan or stack damper controls furnace pressure.
The gas
Clean air that has passed through an air heater or recuperator. Density is lower than ambient, so the fan is selected at the hot condition and checked for motor load at cold start.
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 steel reheating furnaces
Dampers in other processes
Waste Heat Recovery BoilersCement Preheater KilnsVertical Roller Raw MillsClinker Grate CoolersRotary Lime KilnsSponge Iron Rotary KilnsBlast Furnace Hot Blast StovesSinter PlantsElectric Arc Furnace SteelmakingLadle Furnaces and Secondary MetallurgyFerro 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.