Charged, or electrically-augmented, wet scrubbers utilize electrostatic effects to improve
collection efficiencies for fine PM with wet scrubbing. Since conventional wet scrubbers rely on the
inertial impaction between PM and liquid droplets for PM collection, they are generally ineffective for particles with diameters less than 1 :m. Pre-charging of the PM in the gas stream can significantly
increase scrubber collection efficiency for these submicrometer particles. When both the particles and
droplets are charged, collection efficiencies for submicrometer particles are highest, approaching that of an ESP.
There are several types of charged wet scrubbers. Particulate matter can be charged negatively
or positively, with the droplets given the opposite charge. The droplets may also be bipolar (a mixture
of positive and negative). In this case, the PM can be either bipolar or unipolar. Figure is a
schematic of a charged wet scrubber.
collection efficiencies for fine PM with wet scrubbing. Since conventional wet scrubbers rely on the
inertial impaction between PM and liquid droplets for PM collection, they are generally ineffective for particles with diameters less than 1 :m. Pre-charging of the PM in the gas stream can significantly
increase scrubber collection efficiency for these submicrometer particles. When both the particles and
droplets are charged, collection efficiencies for submicrometer particles are highest, approaching that of an ESP.
There are several types of charged wet scrubbers. Particulate matter can be charged negatively
or positively, with the droplets given the opposite charge. The droplets may also be bipolar (a mixture
of positive and negative). In this case, the PM can be either bipolar or unipolar. Figure is a
schematic of a charged wet scrubber.
Schematic diagram of a charged wet scrubber
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