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BHS-Candle Filters work intermittently using filter elements arranged vertically in a pressure vessel.
BHS-Candle Filters are used as deep-bed or precoat filters for clarifying liquids with a low solids content. Although the BHS-Candle Filter is used ideally for batch filtration it can also be employed for continuous cycles.
The suspension is filled into the pressure vessel and constantly replenished up by pump. The filter cake builds on the outside of the filter candles, the filtrate being discharged from the inside of the candle through immersed and register pipes. The filter cake can be dried after filtration. A blast of compressed air finally lifts and discharges the cake.
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‘Becofil’ Candle Demisters
'Becofil' Candle Demisters, commonly referred to as Candle Filters - are intended primarily for the removal of very fine mist particles of less than 2 microns. A combination of impingement for removing greater than 1-2 microns and diffusion for finer particles where Brownian motion becomes increasingly predominant.
Each filter is composed of millions of fibres, and although the efficiency of each individual fiber is low, the cumulative effect is very high. Low approach velocities are necessary in order not to mask the diffusion velocities associated with Brownian movement. Candle filters are installed vertically and gases pass horizontally through the filter wall, the trapped particles coalescing and draining through the filter bed.
The continuing development of 'Becofil' Candle Demisters coupled with the experience gained from hundreds of applications worldwide, enables Begg Cousland to offer a range of filters to conform to the varying requirements of industry in terms of capacity, pressure loss and mist removal efficiency.
'Becofil' Candle Demisters will help to eliminate visible stack plumes, meet today’s more stringent air pollution regulations and recover more lost products from processes. It will also help to remove pollutants, which may cause corrosion further downstream resulting in costly premature replacement of equipment and maintenance down time.
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Candle filters utilize groups of columnar filter elements sealed within a pressure vessel to produce a cake with dry solids contents as high as 80% and filtrate of extremely high clarity. Filtration is completely contained, making candle filters an ideal choice for processing solvents, concentrated acids and other toxic products.
Typical Applications:
- Pulp and paper (recausticizating)
- Alumina (specialty hydrates)
- Precious metal catalysts
- Filtrate and concentrate polishing
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Filtercandles and tubes are available in many sizes up to 500 mm length.
Many special designs are manufactured by our produc- tion according to customers specifications.
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# for different applications in filtration of liquids
# for high and low pressure
# various shapes and geometrics
# customized construction
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