Reply by crank49

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Posted on On a Dust Collector what about placing impeller before cyclone?

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4032 posts in 4211 days

#1 posted 06-29-2015 03:19 PM

High efficiency cyclones that could catch finer particles exist, but require much more horsepower to operate than a comparable filter. High efficiency cyclones have pressure drops of over 10 inches static. Increasing pressure requires 3 times more horsepower than increasing volume.

Normal low to medium efficiency woodworking cyclones only catch larger particles.
The fine particulate still goes to the filter.
Fine particulate is what gets into the pores of the filter and cause blinding.
The proper way to avoid this is to increase the surface area of the filter media which reduces the velocity if the particles so they don’t get embedded into the pores in the first place.
Trying to capture the fine particles with a cyclone before they get to the filter is redundant and just adds to the operating cost.

There are several ways to capture air borne dust particles. Expansion chambers and drop out boxes, belt filters, pad filters, bag filters, cartridge filters, low medium and high efficiency cyclones, wet scrubbers, electrostatic participators and probably more. Each method has advantages and dis-advantages.

Cyclones are mostly used in industry when a filter won’t work because of sticky or hot dust. Grinding dust with sparks is a good example of a cyclone application.

In the case of low efficiency cyclones, low cost is a factor. A low pressure drop cyclone will have low efficiency, low building cost and low operating cost and is acceptable when dealing with non-hazardus dust. A high pressure drop cyclone will have high efficiency, be expensive to build and have high energy cost to run.

Cartridge filters are the best at capturing fine dust but are susceptible to catching fire in industrial settings because of the paper filter media. They are difficult to clean sometimes, depending on the dust type.

Bag filters are cheap, can have low pressure drop for low operating cost, but need a lot of surface area. A bag filter with performance comparable to a cartridge filter would require about 5 times the volume.

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