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New laboratory measurement method for water spray dust control effectiveness.
McCoy JF; Schroeder WE; Rajan SR; Ruggieri SK; Kissell FN
Am Ind Hyg Assoc J 1985 Dec; 46(12):735-740
A new approach was presented to investigate dust reduction techniques based on dust removal within a well mixed chamber. The method had several advantages: there was no need for a steady production of dust; only single point dust sampling was required; and only relative, not absolute, dust concentration accuracy was needed. This approach treated the dust as monodispersed; no account was made for variations in dust particle size. The analysis predicted, in the absence of dust production within the chamber, that any dust concentration will have a log linear or exponential time decay curve. The test dust was fine Arizona road dust, pneumatically transported into the chamber from a continuous dust imprecise dust feeder. Tests were made of a water powered scrubber, hydraulic sprays, and charged sprays. Dust removal effectiveness was successfully measured using the mixed chamber. The method was especially efficient in determining many properties of open sprays. The dust removal effectiveness of hydraulic sprays was closely proportional to the water pressure. Warmer water demonstrated a slight increase in effectiveness. When the spray impinged on surfaces as close as 300 millimeters from the nozzle, there was a slight decrease in effectiveness. Effectiveness was not changed through the addition of a wetting agent to the spray. Increased dust removal was noted when an electric charge was applied to water droplets. The authors state that many dust removal devices can be studied by this method including scrubbers, filters, and electrostatic precipitators.
Dust-particles; Dust-sampling; Dust-suppression; Air-quality-monitoring; Air-sampling; Airborne-dusts; Particulate-dust; Milling-industry; Dust-collectors; Dust-control; Electrostatic-precipitators; Mining-industry; Air-purification; Laboratory-testing; Simulation-methods; Dust-control-equipment
Issue of Publication
American Industrial Hygiene Association Journal
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division