Paint and resin overspray can coat packing with a sticky film that captures more dust and droplets, progressively increasing pressure drop and reducing wetting. Upstream overspray capture, coating chemistry, packing openness, cleaning access, and deposit behavior should be evaluated before selecting fine high-area packing.
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Pingxiang Daier Separation TechSep 21, 20262 min read
Engineering Evaluation Case: Paint Overspray Enters a Packed Scrubber and Forms a Sticky Coating Instead of a Normal Dust Deposit
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Sep 21, 20262 min read
Engineering Evaluation Case: Activated Carbon or Lime Powder from an Incinerator Gas-Treatment System Reaches the Wet Packed Scrubber
When activated carbon, lime, or other injected sorbent powder reaches a downstream wet scrubber, it can form slurry, foul packing, block distributors, and blind mist eliminators. Review upstream particulate-control performance, solids loading, recirculation solids removal, packing openness, and deposit composition before replacing the packed bed.
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Sep 21, 20262 min read
Engineering Evaluation Case: A Venturi Pre-Scrubber Sends So Much Liquid Carryover into the Packed Tower That the Polishing Bed Floods
When a Venturi scrubber feeds a downstream packed tower, include Venturi droplet and slurry carryover in the packed-bed hydraulic load. Excess entrainment can overload the lower bed, increase pressure drop, deposit solids, and make the tower appear undersized. Interstage separation should be reviewed before changing packing.
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Sep 21, 20262 min read
Engineering Evaluation Case: One Odor Scrubber Must Remove Both H₂S and NH₃ but the Two Contaminants Prefer Different Liquid Chemistry
A mixed H₂S/NH₃ odor stream should not be treated as one generic “odor gas” duty. Because H₂S and NH₃ favor different absorption chemistries, evaluate concentrations, pH requirements, stage configuration, interstage carryover, and individual outlet targets before selecting packed-bed height or media.
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Sep 21, 20262 min read
Engineering Evaluation Case: Reboiler Entrainment Carries Heavy Liquid into the Bottom of a Structured-Packing Bed
When the lower section of structured packing fouls or floods after reboiler duty increases, investigate liquid entrainment from the reboiler or sump. Vapor disengagement, operating level, vapor velocity, heavy-component carryover, lower-bed pressure drop, and inlet spacing should be reviewed before replacing the packing.