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Cyclones are frequently used as product receivers, as pre-cleaners to
high efficiency fabric-type dust collectors, or as independent
collectors for coarse dusts.
Theory of operation
Airex Industries standard
Three cyclone designs are offered in order to best
meet the application's requirements. The GP series is designed for
economical first cost and is currently used for general purposes. The HE
series is tuned to obtain a higher efficiency in more critical
applications. The HF series is used in high flow applications in order
have a more compact configuration.
How cyclones work
As the dirty air enters the cyclone, it is forced
into a swirling movement. This results in a centrifugal force acting on
the dust particles suspended in the air stream. The particles, denser
than the air, are forced to move outwards, towards the cyclone wall.
They then fall downwards, towards the dust exit. The clean air is
eventually directed towards the centre of the cyclone and leaves through
the gas exit.
Efficiency
Efficiency is a function of the physical parameters
of the application and the design parameters of the cyclone. Cyclone
efficiency increases with:
Coarse particle size distribution
Higher products specific gravity
Lower gas density
Smaller outlet diameter. An increase in presure drop also
results.
Advantages
Stable pressure drop for a given gas flow
Constant efficiency for a given particulate condition
No moving parts; no replaceable filters, robust construction
Ability to handle extremely high dust concentrations
High temperature and pressure capability
Low capital investment and maintenance costs
Compact (in most applications)
Options
Selection criteria
In order for Airex Industries to help you in making
the right cyclone selection, the following data will be required:
Air flow (cfm)
Temperature of the application(F)
Air speed at inlet(fpm)
Dust quantity entering the cyclone (lbs/hr)
Particle density (lbs/ft3
Options
Abrasive wear liners
Refractory lining
High efficiency dust collectors
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