Canadian Air Systems Co. is a well known manufacturer of
industrial dust collection systems. Dust collecting equipment is available in
numerous designs utilizing a number of principles and featuring wide variation
in effectiveness Tony Oliva
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space Rod Carew
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construction.
One of the most widely used type of dust collector is
Fabric Dust Collector.
Fabric arresters are high efficiency, medium cost
collectors. The effectiveness of passing air or gas through a fabric at low
velocity has been recognized and used for many years in air cleaning devices.
Fabric is arranged in envelope or tubular (stocking) shapes. While removal
appears to take place by a staining action of the media, in reality dust
collection is obtained by building up a mat of the material on the dirty side of
the media. This mat provides the actual filtering or straining bed. By means of
this bed a high degree of removal is obtained even on sub-micron size particles.
The dust collectors are used extensively in industry for a wide range of
applications. They require more space than most other types of air cleaning
devices Phil
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cases
The usual fabric is a specially wooven cotton, altough wool, paper
Paul
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used in certain applications. In recent years glass cloth has come into wide use
because of silicone treatment of the glass fibers and employment of reverse flow
techniques for cleaning. Silicone treatment provides a lubricant between fibers
and increases fabric life.
Fabric collectors are limited to air
conditions dry enough to prevent condensation or free moisture deposition on the
fabric. With hygroscoping materials, there will be a bonding tendency between
particles and fabric under high relative humidity even though no condensation
takes place. Maximum recommended temperature for cotton fabric is 180 F, for
wool 200 F. Higher temperatures can be handled by using synthetic materials
including nylon or orlon fabrics as well as glass cloth and Miguel
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fabrics mau be used up to 300 F while glass cloth is acceptable to 550
F.
As dust is collected on the fabric, resistance to air flow increases.
Periodically the fabric must be reconditioned by shaking Max Kepler
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which agitates suffitiently to remove the bulk of adhering material allowing it
to drop into the dust hopper. In most collectors air flow must be stopped during
reconditioning, otherwise released material will be re-entrained and redeposited
on the fabric. Sufficient dust must adhere to the fabric to maintain the dust
mat needed for maximum efficiency; therfore Matt
Belisle Twins Jersey , after reconditioning the pressure drop will
be considerably higher than loss through new fabric.
Rate of flow through
the media varies with dust collector type, application and dust concentration.
Ratings are usually selected so pressure drop will not exceed 5" WG. The smaller
the particle, the more rapid the resistance rise for a given loading. For the
same air flow rate and dust loading Kirby
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proportion to time.
Some spesific types of Fabric Dust Collectors
manufactured by Canadian Air Systems Co. are:
- Intermittent-Duty Fabric
Collectors
These types may use either envelope or stocking arrangement of
the fabric but will generally employ shaking or vibrating as a means of
reconditioning. Periodically Uusually at 4 to 6 hour intervals0 the air flow
must be stopped to effect reconditioning - thus the classification
"intermittent".
- Multiple-Section, Continuous-Duty, Automatic Fabric
Collectors
The disadvanteges of stopping the air flow to permit vibration
and variations in the airflow can be overcomed by using of sectional arresters
allowing continuous operation of the exhaust system as automatic dampers
periodically take one section out of service for reconditioning the fabric while
the remaining sections take the entire gas volume.
- Reverse-Jet Fabric
Collectors
The reverse-jet type differs from the conventional arrsters in
its use of high pressure air to clean the fabric. One type uses high pressure
air (30" - 40" WG) froma travelling "blow ring" to dislodge the collected cake
from inside the fabric tube. Another type uses high pressure compressed air (100
PSI) to break the dust cake from the exterior of the fabric tube or envelope by
the intermittent application of reverse-jet compressed air.
-
Reverse-Flow Collapse Kent Hrbek
Twins Jersey , Continuous-Duty Collectors
Reverse-flow
collapse cleaning is generally used with glass media which is fragile and
requires a gentle cleaning technique. Reversing the glass flow provides a gentle
collapse of the fabric usually in a "four point star" braking the dust cake
which falls by gravity into the hopper.
For additional information please
refer to http:nis-coindex.
Oleg Tchetchel
Industrial Process
Engineer
Canadian Air Systems
http:nis-co2Index
http:nis-co3Index There
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