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A Precipitator is a device that captures particulates from a gas
stream.
In the simplest terms, a precipitator is a large box. The particulate
laden gases are drawn into one side of the box using perforated plate
and diffusers to evenly distribute the gas. Inside, high voltage electrodes
impart a negative charge to the particles entrained in the gas. These
negatively charged particles are then attracted to a grounded collecting
surface, which is positively charged. The gas then leaves the box, up
to 99.9% cleaner than when it entered.
Inside the box, the particles from the continuing flow of dust build
up on the collection plates or tubes. At periodic intervals, the plates
in a Dry ESP are rapped, and the tubes in a Wet ESP are flushed, causing
the particles to fall into the collection hopper. In a Dry ESP the particles
are usually removed from the hopper by a rotary screw arrangement. In
a WET ESP the hoppers are designed to gravity drain or pump the flush
water to designated treatment or disposal
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