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Monday, February 16, 2015

Mechanically-aided Scrubbers

Mechanically-aided scrubbers (MAS) employ a motor driven fan or impeller to enhance gasliquid
contact. Generally in MAS, the scrubbing liquid is sprayed onto the fan or impeller blades. Fans
and impellers are capable of producing very fine liquid droplets with high velocities. These droplets are effective in contacting fine PM. Once PM has impacted on the droplets, it is normally removed by
cyclonic motion. Mechanically aided scrubbers are capable of high collection efficiencies, but only with a commensurate high energy consumption. An example of a mechanically aided scrubber is provided in Figure

Because many moving parts are exposed to the gas and scrubbing liquid in a MAS, these
scrubbers have high maintenance requirements. Mechanical parts are susceptible to corrosion, PM
buildup, and wear. Consequently, mechanical scrubbers have limited applications for PM control.
Diagram of a Mechanically-aided Scrubbers

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