GEA centrifugal separators for exhaust gas cleaning in the process industry.
Collection principle: The gas to be cleaned is brought into rotational flow in a cylindrical collection chamber, resulting in high centrifugal forces which fling the dust particles against the outer wall. From there the spiral down into the dust hopper, while the cleaned gas leaves through a central pipe. The collection efficiency essentially depends on the size of the dust particles, the specific gravity of the dust and the geometrical proportions of the centrifugal separator. Owing to the high collection efficiencies currently demanded, centrifugal separators are new generally used only as coarse particle and preliminary separators, e.g. to protect fans, boiler heating surfaces and heat exchangers from wear or the formation of accretions and to reduce the dust load of more efficient final separators. Centrifugal separators are also used in chemical process technology e.g. for dust recycling systems. The smallest particle size that can be efficiently collected is 5-10 µm, depending on the dust properties. The pressure drop is 6 – 20 mbar. There are two types of centrifugal separator: Cyclone and multiclones.