Aerotech Fans
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Aerotech Fans
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Technical answers to common questions about dust collection.
PTFE (Teflon) membrane filter bags are required when handling highly abrasive dust, sticky/agglomerative particulates, or extreme temperatures up to 260°C. The slick membrane forces surface filtration, preventing dust from penetrating the core fabric and ensuring flawless pulse-jet cleaning.
Explosion vents on a dust collector are sized strictly according to NFPA 68 standards. The calculation requires the Kst value (explosive severity) and Pmax (maximum pressure) of the specific dust, matched against the total internal volume of the baghouse housing.
The cyclone body itself has no moving parts and requires no electricity. However, the system requires a high-pressure centrifugal blower to overcome the cyclone's aerodynamic pressure drop (typically 3 to 6 inches of water gauge) and maintain the high-velocity vortex.
The air-to-cloth (A/C) ratio dictates the filtration velocity. If the A/C ratio is too high (too much air, too little fabric), the interstitial velocity prevents the dust cake from falling into the hopper during pulsing, causing permanent bag blinding and a massive spike in motor energy consumption.
A blocked rotary airlock is usually caused by bridging of oversized materials or severe moisture coagulation in the hopper. The system must be locked out, and the access port opened to manually clear the shear-point. Never use compressed air to blow out a jammed rotary valve due to deflagration risks.
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.
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.
Yes, dust collectors handling organic particulates like flour, sugar, and cornstarch require strict ATEX and NFPA 68 certification. These systems must be equipped with explosion venting panels and epitropic (anti-static) filter media to prevent catastrophic deflagration.
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.
