TM 5-815-1/AFR 19-6
frequently used for particle collection of
keeps the packing elements clean. Moving
particles larger than several microns in
bed scrubbers are used for particle collection
diameter. Pressure drops range from 4 to 20
and gas absorption when both processes
inches, water gauge.
must be carried out simultaneously. Particle
(5) Moving bed scrubbers. Moving bed
collection efficiency can be good down to
scrubbers provide a zone of mobile packing
particle sizes of one micron. Gas absorption
consisting of plastic, glass, or marble spheres
and particulate collection are both enhanced
where gas and liquid can mix intimately
when several moving bed stages are used in
(figure 7-3). A cylindrical shell holds a
series. Pressure drops range from 2.5 to 6
perforated plate on which the movable
inches water gauge per stage.
b. High energy scrubbers. High energy scrubbers
packing is placed. Gas passes upward
through the perforated plate and/or down
utilize high gas velocities to promote removal of parti-
over the top of the moving bed. Gas
cles down to sub-micron size. Gas absorption efficien-
velocities are sufficient to move the packing
cies are not very good because of the co-current
material when the scrubber is operating
movements of gas and liquid and resulting limited gas/
which aids in making the bed turbulent and
liquid contact time.
7-2
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