What the fans do here
Chemical plants exhaust corrosive fumes from reactors, dryers and storage into wet scrubbers, with fans in stainless steel, PP-FRP or rubber-lined construction. Pharma plants add clean-room supply through AHUs with pre, fine and HEPA filtration, and solvent recovery through adsorption towers. MVR blowers recompress vapour on evaporators and effluent plants.
Applications in this industry
| Application | What it does | Type usually selected |
|---|---|---|
| Fume Exhaust System | 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. | Backward inclined and radial tipped |
| MVR Blower | Recompresses the vapour leaving an evaporator so it can be reused as the heating medium. Handles wet, often corrosive vapour, so wetted parts are in stainless steel. | Backward curved |
| AHU | A packaged unit with fan, filters, cooling or heating coil and mixing box that conditions and delivers supply air. Pre, fine and HEPA filters as the air quality requires. | Backward curved and forward curved |
| HVAC | Supply, return and exhaust fans for heating, ventilation and air conditioning of plant and office space. Low pressure, so efficiency and noise govern. | Axial, backward inclined and forward curved |
| Mist Eliminator | Separates entrained liquid droplets from a vapour or gas stream, ahead of a compressor, a fan or a stack. | Demister Knockdown Vessel |
| Dust Collector Fan | The fan behind a bag filter, cyclone or multiclone on a dust extraction system. Placed on the clean side where possible so the blade can be chosen for efficiency. | Backward inclined and radial tipped |
Processes in this industry
Equipment supplied
Centrifugal Fans
0.3 to 120 m³/s, 25 to 3120 mmWC single stage. Six blade configurations, three drive arrangements.
Wet Scrubber
Static, spray tower, packed bed, venturi and cyclonic spray types. Efficiency to 99.9% down to 5 micron.
Adsorption Tower
Activated carbon towers for solvent, VOC and odour removal.
Ventilation System
Supply and exhaust ventilation, evaporative cooling, roof extractors, jet fans and air distribution.
Axial Fans
0.3 to 70 m³/s, 3 to 75 mmWC. Direct drive, belt drive and bifurcated. Fixed or variable pitch impellers.
Demister Knockdown Vessel
Vertical or horizontal vessels to separate liquid from a two-phase vapour stream.
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.