Orifice scrubbers, also known as entrainment or self-induced spray scrubbers, force the
particle-laden gas stream to pass over the surface of a pool of scrubbing liquid as it enters an orifice.
With the high gas velocities typical of this type of scrubber, the liquid from the pool becomes entrained in the gas stream as droplets. As the gas velocity and turbulence increases with the passing of the gas through the narrow orifice, the interaction between the PM and liquid droplets also increases.
Particulate matter and droplets are then removed from the gas stream by impingement on a series of
baffles that the gas encounters after the orifice. The collected liquid and PM drain from the baffles back into the liquid pool below the orifice. Orifice scrubbers can effectively collect particles larger than 2 :m in diameter. Some orifice scrubbers are designed with adjustable orifices to control the velocity of the gas stream. A typical orifice scrubber is shown in Figure
Orifice scrubbers usually have low liquid demands, since they use the same scrubbing liquid for
extended periods of time. Because orifice scrubbers are relatively simple in design and usually have
few moving parts, the major maintenance concern is the removal of the sludge which collects at the
bottom of the scrubber. Orifice scrubbers rarely drain continually from the bottom because a static
pool of scrubbing liquid is needed at all times. Therefore, the sludge is usually removed with a sludge
ejector that operates like a conveyor belt. As the sludge settles to the bottom of the scrubber, it lands
on the ejector and is conveyed up and out of the scrubber. Figure shows a typical sludge ejector
particle-laden gas stream to pass over the surface of a pool of scrubbing liquid as it enters an orifice.
With the high gas velocities typical of this type of scrubber, the liquid from the pool becomes entrained in the gas stream as droplets. As the gas velocity and turbulence increases with the passing of the gas through the narrow orifice, the interaction between the PM and liquid droplets also increases.
Particulate matter and droplets are then removed from the gas stream by impingement on a series of
baffles that the gas encounters after the orifice. The collected liquid and PM drain from the baffles back into the liquid pool below the orifice. Orifice scrubbers can effectively collect particles larger than 2 :m in diameter. Some orifice scrubbers are designed with adjustable orifices to control the velocity of the gas stream. A typical orifice scrubber is shown in Figure
Diagram of an orifice scrubber
Orifice scrubbers usually have low liquid demands, since they use the same scrubbing liquid for
extended periods of time. Because orifice scrubbers are relatively simple in design and usually have
few moving parts, the major maintenance concern is the removal of the sludge which collects at the
bottom of the scrubber. Orifice scrubbers rarely drain continually from the bottom because a static
pool of scrubbing liquid is needed at all times. Therefore, the sludge is usually removed with a sludge
ejector that operates like a conveyor belt. As the sludge settles to the bottom of the scrubber, it lands
on the ejector and is conveyed up and out of the scrubber. Figure shows a typical sludge ejector
Diagram of a sludge ejector in an orifice scrubber
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