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Pollution Control Services, Inc.
On Site Technical Service for Wet & Dry Electrostatic Precipitators, Scrubbers & Baghouses Our People, Our Experience, Your Success |
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Devices called wet scrubbers trap suspended particles by direct contact with a spray of water or other liquid. In effect, a scrubber washes the particulates out of the dirty airstream as they collide with and are entrained by the countless tiny droplets in the spray.
Several
configurations of wet scrubbers are in use. In a spray-tower scrubber, an
upward-flowing airstream is washed by water sprayed downward from a series of
nozzles. The water is recirculated after it is sufficiently cleaned to prevent
clogging of the nozzles. Spray-tower scrubbers can remove 90 percent of
particulates larger than about 8
In orifice
scrubbers and wet-impingement scrubbers, the air and droplet mixture collides
with a solid surface. Collision with a surface atomizes the droplets, reducing
droplet size and thereby increasing total surface contact area. These devices
have the advantage of lower water-recirculation rates, and they offer removal
efficiencies of about 90 percent for particles larger than 2
Venturi scrubbers
are the most efficient of the wet collectors, achieving efficiencies of more
than 98 percent for particles larger than 0.5
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m
(0.0003 inch).