Cyclone collection efficiency

Kalen and Zenz have shown that maximum cyclone collection efficiency occurs at v/v = 1.25, and Zenz has found experimentally that fluid reentrainment occurs at v/v == 1.36. 

Cyclones are seldom used as the primary means of particulate collection, but often serve as first-stage air cleaning devices that are followed by other methods of particulate collection. Cyclone collection efficiency is probably more susceptible to changes in particulate characteristics than are other types of devices, therefore, care should be taken if used. Cyclone operation is dependant, generally, on physical parameters such as particle size, density, and velocity, as opposed to the chemical nature or properties of the material being collected. 

Calculate the ratio of 4> /-Op,th for each cut and determine the low-loading cyclone collection efficiency for each cut size. 

Determine the overall cyclone collection efficiency (Eo) for very low loading cyclones (low loading is defined to be 1 grain/ft (0.0023 kg/ m ) by the relation... 

Modify the low-loading cyclone collection efficiency for the effect of loading. 

Low-loading cyclone collection efficiency, % Fanning friction factor Cyclone inlet height. 

Figure 21. Effect of Inlet Loading on FCC Cyclone Collection Efficiency - King (1992)...

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