Aerotech Fans
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Aerotech Fans
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Engineering answers to the most common questions about industrial ventilation, air handling, and pollution control systems.
Random packing media, such as Pall rings or saddles, is used to drastically increase the internal wetted surface area of the scrubber column. This maximizes the gas-to-liquid contact time, which is critical for the chemical absorption of toxic gases like ammonia and hydrochloric acid.
Standard polyester bags will melt at 250°C, so high-temperature clinker cooler baghouses must utilize woven fiberglass filter bags laminated with an ePTFE (Teflon) membrane, providing thermal stability up to 260°C and excellent release of abrasive dust.
A persistently high differential pressure indicates bag blinding. This occurs when the compressed air header pressure is too low to shatter the dust cake, or if moisture has entered the airstream, turning the dry dust into a sticky mud that permanently clogs the filter media.
Grease leakage on the roof indicates a failure of the fan's integrated grease trap, or the use of a standard ventilator instead of a UL-762 rated upblast exhaust fan. Upblast fans feature a fully welded, leak-proof base and a discharge spout designed to safely route grease into a collection box.
A Double Inlet Double Width (DIDW) blower should be chosen when you require massive volumetric airflow (CFM) in a clean-air environment with restricted installation space, such as an HVAC Air Handling Unit. For high-pressure or material handling, an SISW blower is required.
Standard Induced Draft (ID) fans are designed to handle continuous flue gas temperatures up to 250°C. For extreme high-temperature applications up to 400°C, the blower must be equipped with water-cooled journal bearings and a shaft cooling wheel to protect the drive arrangement.
The optimal header pressure for a reverse pulse-jet cleaning system is between 90 to 100 PSI (6.2 to 6.9 bar). Pressure below this threshold fails to shatter the dust cake, while excessive pressure causes premature mechanical wear and blinding of the filter media.
Calcium scaling on the packing media occurs when using hard makeup water. It is prevented by strictly managing the blowdown rate to control dissolved solids, and by dosing the recirculating scrubber liquid with antiscalant polymers to keep the calcium suspended in solution.
Cyclone dust collectors are highly efficient at capturing coarse, heavy particulates larger than 10 microns. For sub-micron dust, the cyclone must be used as a primary spark-arrestor or pre-filter, followed by a secondary baghouse or wet scrubber.
A bifurcated fan is required when extracting highly corrosive gases, acidic vapors, or extreme-temperature exhaust (up to 200°C). The bifurcated casing physically isolates the electric motor from the hazardous airstream, preventing catastrophic winding failure.
If a 3-phase motor is wired incorrectly and an ID fan runs backwards, a backward-curved or radial impeller will still move air in the correct direction due to centrifugal force, but it will operate at a fraction of its design CFM and efficiency, causing severe system underperformance.
Unlike ducted fans that run continuously, jet fans utilize Demand Control Ventilation (DCV). By linking the jet fans to Carbon Monoxide (CO) sensors, the fans only activate and ramp up via VFDs when toxic gas levels rise, saving up to 60% in annual brake horsepower consumption.
