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three hydrocyclones in series of classifiion

three hydrocyclones in series of classifiion

Visual Encyclopedia of Chemical Engineering

In general, cyclones use centrifugal force to separate particles in a gas or liquid stream. In hydrocyclones, liquid is the fluid medium. There are two design classifications for cyclones. Uniflow or swirl tube cyclones are designed so that the clean gas or liquid leaves the cyclone in the same direction that the inlet gas flows. Uniflow cyclones are often seen in series and do not contain a conical section. The dust simply exits the cyclone with a small portion of the inlet gas stream, about 5 10%. Alternatively, reverse flow cyclones have a vortex reversal allowing the clean gas to exit at the top of the cyclone. Reverse flow cyclones usually stand alone and solid dust collects in the conical portion of the cyclone for removal. In reverse flow cyclones contaminated liquid or dust laden air enters tangentially near the top of the cyclone. Larger or heavier particles are thrown to the sides and slide to the bottom, where they are collected. The remaining air or liquid...

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A tangential inlet is the most common type of inlet because it is least expensive and most efficient. Additional inlet options are wrap around, helical and axial. Wrap around inlets are best for high throughput designs and axial inputs are often seen in multi cyclone configurations. For a given particle size, a portion of the particles will exit out the bottom with the underflow, and the rest will exit with the overflow. The heavier the particle, the greater the chance that it exits out the bottom. The cutpoint size, a measure of a cyclone39;s performance, is defined as the particle size for which half the particles exit at the top and half at the bottom. A coarser cutpoint means that only larger particles can be separated. A finer cutpoint means that smaller particles can be removed. Cyclones can handle flow rates ranging from 3 gpm to over 10,000 gpm. Small diameter cyclones may be manifolded to handle larger flow rates with higher efficiency. Cyclones can also be...

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Hydrocyclones are used in desliming , degritting, concentration, recovery of solids, clarification , open circuit classification and closed circuit grinding . The hydrocyclone below is used to remove polypropylene powder from a solvent recovery unit. Cyclones can recover powder coatings, dusts, chemicals and catalysts. The quad cyclone below is used to collect coal dust. Cyclones are also commonly used to control particulate emissions and meet air quality standards. They can be designed to collect particles as small as 5 microns in diameter.

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