The process
Cold rolling and annealing lines emit oil mist at the mill stands and fume from the cleaning sections. Mist eliminators on the mill exhaust, fume extraction with scrubbing on the cleaning line, and hot air fans on the strip dryers.
The gas at the fan
Air saturated with moisture from drying, with condensation on any cool surface. Drainage, a shaft seal and a material that tolerates wet running are part of the specification.
Selection for this duty
| Construction | Stainless steel or lined vessel with mesh pad or vane pack sized for the droplet load |
| Density at the fan | At about 120°C the gas density is close to 0.90 kg/m³, 75% 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. |
Separates entrained liquid droplets from a vapour or gas stream, ahead of a compressor, a fan or a stack. Client-stated blade types for the Mist Eliminator in general: Demister Knockdown Vessel.
Industries
Other fans in cold rolling mills
Mist Eliminator in other processes
Hot Dip Galvanising LinesWaste IncineratorsBiomedical Waste IncineratorsChemical Reactor and Tank VentsMVR EvaporatorsEffluent Treatment and Zero Liquid Discharge PlantsFertilizer Granulation PlantsSulphuric Acid PlantsFlare and Pressure Relief SystemsGas Compressor StationsPaper Machine Dryer SectionsTextile Stenters and DryersPickling and Acid Treatment LinesBOF Steel ConvertersEdible Oil Solvent Extraction 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.