The process
Foundries emit fume at the furnace, sand dust at the shakeout and knock-out, and organic vapour from binders in the moulding and core shop. Each goes to its own collector, with adsorption on activated carbon for the vapour and bag filters for the dust.
The gas at the fan
Fume from arc, induction or reverberatory furnaces, hot and carrying fine metallic oxide dust. Temperature is handled by dilution air or a cooler ahead of the filter, and the fan sits on the clean side where possible.
Selection for this duty
| Construction | Axial fans in weatherproof cowls, or supply and exhaust units with filters as the air quality requires |
| Density at the fan | At about 200°C the gas density is close to 0.75 kg/m³, 62% 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. |
An axial fan in a weatherproof cowl mounted on an inclined or flat roof, exhausting hot air from the ridge of a factory shed. Client-stated blade types for the Roof Extractor in general: Axial.
Industries
Other fans in iron and non-ferrous foundries
Fume Exhaust SystemDust Collector FanBag Filter FanVentilation FanCombustion Air BlowerAdsorption Tower
Roof Extractor in other processes
Induction Furnace Melt ShopsForge ShopsDyeing and Finishing HousesWelding and Fabrication ShopsTyre Curing PressesShipyard Hull and Block FabricationGenerator and Engine RoomsCar Parks and TunnelsFactory Shed VentilationJute Mills
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.