Ventury Scrubber

The Venturi Scrubber uses a venturi-shaped construction to establish throat velocities considerably higher than those used by the orifice type. Gas velocities through venturi throats may range from 12,000-24,000 fpm. Water is supplied by piping or jets at or ahead of the throat at rates from 5-15 gpm per thousand scfm of gas. The collection mechanism of the venturi is impaction. As is true for all well-designed wet collectors, collection efficiency increases with higher pressure drops. Specific pressure drops are obtained by designing for selected velocities in the throat. Some Venturi Scrubbers are made with adjustable throats allowing operation over a range of pressure drops for a given flow rate or over a range offlow rates with a constant pressure drop. Systems are available with pressure drops as low as 5″ wg for moderate collection efficiency and as high as 100″ wg for collection of extremely fine particles.
The venturi itself is a gas conditioner causing intimate contact between the particulates in the gas and the multiple jet streams of scrubbing water. The resulting mixture of gases, fume-dust agglomerates, and dirty water must be channeled through a separation section for the elimination of entrained droplets.