Aerotech Fans
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Aerotech Fans
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Technical answers to common questions about air pollution control.
Chemical packed bed scrubbers utilize random packing media, most commonly Pall rings, Raschig rings, or Intalox saddles. Fabricated from Polypropylene (PP) or PVDF, these shapes maximize the wetted surface area for gas absorption while minimizing aerodynamic pressure drop.
When equipped with a PTFE-coated HEPA H14 final filter, a welding fume extractor captures 99.995% of sub-micron metallic oxides, keeping Hexavalent Chromium (Cr(VI)) and Manganese exposures well below OSHA's strict Permissible Exposure Limits (PEL).
Because the Venturi throat accelerates gas to extreme velocities, the throat walls are subject to severe abrasive erosion. Maintenance involves periodic ultrasonic thickness testing of the throat walls and replacing the internal silicon carbide or ceramic wear liners before structural failure occurs.
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.
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.
