Flue gases from combustion of solid and agro-waste fuels in boiler furnaces invariably contain high level of particulate emission, depending upon fuel composition and combustion controls. The primary emission control equipment in such boilers is the multi-cyclone dust collector. Flue gases exiting from boiler are made to pass through vertical annular space between tubes with tangential entry.
Heavier soot and ash particles separate and fall down due to centrifugal action and clean flue gas are discharged from the exit. The ash collected at the bottom is discharged through manual gates or rotary air valves. The sizes of multi-cyclone dust collectors are standardized as per boiler output capacities and readily available as boiler accessories.