Air cyclones

Does the following calculations for a gas or air cyclone sizing, pressure drop, and fractional and overall efficiency. 

The equipment most commonly used for classification involves vibrating screens, rotary screens and disc screens. Air cyclones, which are mostly used as density separation equipment, are described in the corresponding chapter. 

Air cyclones are used to separate the fight fraction, recovered from air separation, into solids and air. They are also used to separate dust from air so that air to be recycled or released in the environment. 

Air cyclone is a devise comprising two parts the upper is cylindrical and the lower is conical (Figure 15). The feed stream (light fraction) is introduced tangentially into the cyclone. Solid particles are subjected to centrifugal force and axially moved to the cyclone wall. Subsequently, being in contact with the wall, they follow a spiral orbit of continuously decreasing radius until they... 

Figure 11.21 Excess-air (cyclone) incinerator (Mound Laboratory). (From Richardson [Rl].)...

Vibrating screens can be used for the separation of oversize material, which is then returned to the mill. Air cyclones have been used for classification operations after dry milling and their counterparts, hydrocyclones, are now coming into more frequent use as classifiers in conjunction with wet milling operations. 

The process for the recycling of most plastics is simple, with separation of the desired plastics from other contaminants the most labor-intensive step. PET soft drink bottles, for example, usually have a paper label, adhesive, and an aluminum cap that must be removed before the PET can be reused. The recycling process begins with hand or machine sorting, after which the bottles are shredded into small chips. An air cyclone removes paper and other lightweight materials, and any remaining labels and adhesives are eliminated with a detergent wash. The PET chips are then dried, and aluminum, the final contaminant, is removed electrostatically. The PET produced... 

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