The process
Hexane extraction plants need flameproof construction on every fan in the extraction building, hot air for the desolventiser toaster and meal dryer, and dust extraction on the seed preparation. The seed dryer and cooler fans handle dusty, humid air.
The gas at the fan
Air carrying solvent vapour from painting, printing or coating. Spark resistant construction, flameproof or increased safety motor, and the fan placed where the duct cannot accumulate vapour.
Selection for this duty
| Blade form | Backward curved or aerofoil for the best efficiency on clean gas |
| Material of construction | Mild steel |
| Drive and bearings | Direct coupled or belt driven; belt drive where the duty point may need tuning at site |
| Also specified | Spark resistant construction with non-ferrous rubbing parts, shaft seal, earthing and a flameproof or increased safety motor |
| Density at the fan | At about 40°C the gas density is close to 1.13 kg/m³, 94% 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. |
Hoods, ducting and an exhaust fan that capture fume at source and deliver it to a scrubber, bag filter or stack. Fan material follows the fume: stainless steel, PP-FRP or rubber lined where it is corrosive. Client-stated blade types for the Fume Exhaust System in general: Backward inclined and radial tipped.
Industries
Other fans in edible oil solvent extraction plants
Fume Exhaust System in other processes
Coke Oven BatteriesElectric Arc Furnace SteelmakingInduction Furnace Melt ShopsLadle Furnaces and Secondary MetallurgyForge ShopsFerro Alloy Submerged Arc FurnacesAluminium Smelters and Cast HousesCopper and Zinc SmeltingIron and Non-ferrous FoundriesHot Dip Galvanising LinesChemical Reactor and Tank VentsEffluent Treatment and Zero Liquid Discharge PlantsSolvent Recovery PlantsFertilizer Granulation PlantsSulphuric Acid PlantsFood Ovens and FryersPaper Machine Dryer SectionsPulp Mills and Recovery BoilersTextile Stenters and DryersDyeing and Finishing HousesAutomotive Paint ShopsPickling and Acid Treatment LinesWelding and Fabrication ShopsTyre Curing Presses
Services on this fan
Information needed to select or quote
- Duty point. Volume flow and static pressure at the fan inlet, with the gas density and temperature or the conditions to derive it.
- Operating conditions. Site altitude, normal operating temperature and continuous or intermittent duty.
- Gas stream. Dust loading and particle size, corrosive species, moisture, upset temperature and any tendency of the material to deposit on the impeller.
- Mechanical. Rotation viewed from the drive end, discharge orientation and motor power.