SHAPA
Filter developments Dust extraction – developments in cartridge filter technology
Some twenty years ago, emerging developments in pleated filter cartridges led some to believe that they would replace the trusty bag filter within a few years. Of course, they did not, but steady innovation has widened the range of applications for which cartridge elements are suitable. Pleated cartridges are inherently more difficult to clean by means of compressed air pulses than their more flexible fabric bag counterparts and this area is where much thought has been given.
Pleated cartridges have a natural advantage over bag filters as much more filter area can be accommodated within the filter body, saving space on site and cost by reducing the amount of steel required for manufacture. However, air speed through the filter elements is limited because of the pleat depth and the narrowness of the pleats themselves, which could reduce the benefits. Cleaning performance may be improved by ensuring that the pleats remain evenly spaced to prevent bunching that could render cleaning partially ineffective. SHAPA member Camfil-Farr incorporates its patented “HemiPleat” separator to ensure even spacing, reporting cleaning efficiency improvements and reduced energy use. Cleaning devices aimed at increasing internal pressure and distributing this evenly across the surface such as the patented “UniClean” tubular insert manufactured by SHAPA member Dantherm Filtration, offer useful benefits. Other developments include vertical tapered cartridges, narrowing towards the bottom to encourage dust to fall away freely. Profiled bottom caps may be used in which the cap follows the pleat profile with no ledges to impede the motion of the dislodged dust. Cartridge filters are supplied by a number of SHAPA member companies; visit the Dust collection and control systems section of the Product Selector at
www.shapa.co.uk.
Pleatable filter materials have progressed, both in variety and efficiency, with many treatments, from simple water release chemicals to microporous surface membranes. However, great care is needed
50 Solids & Bulk Handling • August 2010
when matching a cartridge filter to an application to ensure long lasting efficiency – or even that it works at all. Sticky or fine agglomerating dusts should attract particular caution. Cartridge filters are not as forgiving as fabric bags, but if applied properly will provide compact, economic and very efficient solutions, but the dust control engineer must first get to know the characteristics of his customer’s material and run tests as appropriate.
For your diary... The SHAPA Knowledge Conference on Tuesday 5th October 2010 at the centrally located Imago Centre at Loughborough University should not be missed. You will learn about the latest developments in solids handling technology, how to benefit from waste and energy reduction and regulatory compliance, with ideal commercial networking opportunities. Contact SHAPA by email:
info@shapa.co.uk or visit:
www.shapa.co.uk
www.solidsandbulk.co.uk
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