In the case of boilers multicyclone dust collector is used to remove particulates from flue gases. Dust collectors are particulate control devices that use centrifugal force & gravity settling to collect pollutants.
A high speed rotating air flow is established within a cylindrical or conical dust collector called a cyclone. Air flows in a helical pattern. Larger particles strike the outside wall and then fall to the bottom of the cyclone from where they can be removed easily.

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