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Future Trends in Dust Collection Technology
Some future technological trends that could be
predicted in dust collector technologies are:
Improvements in Collection and Cleaning Efficiencies
Technologies would need to address particles of all sizes, especially finer
particles in the two microns and less range. Better cleaning systems and filter
media are being constantly developed. Some improvements that have come into the
dust collection technologies over the past few years are:
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- For improved dust collection in cartridge
collectors, a downward flow was found to cause an efficient distribution of
inlet air.
- Inlet baffles divide dusty air into multiple
streams, thus reducing upward rising flows in the dirty air chamber
- In baghouses, the process air inlet was located at
the upper portion of the dirt air chamber, such that air enters in a
perpendicular direction to the vertical bags. The dusty air speed falls sharply
and dust particles drop out
- A perforated vertical baffle at the inlet
distributes dusty air into the bags area. The design causes a continuous
downward flow and facilitates collection of fine dust by the bags
- Increased distance between bags and cartridges
facilitates easier cleaning and collection processes
- A nozzle helps to prevent dust from embedding on
adjacent bag surfaces. This design used the higher speed obtained from nozzle to
bring in more induced air into the cartridge or bag. The initial high speed of
air jet at the nozzle mouth falls sharply as it enters the bag. This improves
cleaning effect on filter media and uses less compressed air per cu.ft of
process stream while achieving an ideal
velocity of cleaning air
Higher Air-to-Cloth Ratios
New designs are required for achieving high process air stream flow rates
while reducing the number of bags and cartridges. Higher ratios imply lower cost
of collector, less space requirement for collector and reduced maintenance
costs.
Specialized Designs for
Chemical Dusts
Some fumes such as welding fumes contain a complex mixture of dust
particles. The mixture includes fine sub micron dusts along with coarser dusts,
moisture droplets and hot sparks. This combination needs specialized designs to
treat, collect and release. Some design improvements include fume dust collector
that cools hot sparks in a spark trap. The design also provides water repellant
filter media and downward flow of dusty air to capture fine particles. A
cleaning jet with a nozzle cleans dust from filter media and allows dust to
settle into hopper.
User-Friendly Designs
Higher degree of automation and use of the dust collectors is necessary.
With these improvements, installation and removal of cartridges has become
easier. More electrically operated options are now being added.
Application Specific
Equipment
Equipment are being designed to be more application specific. Applications
could include reducing moisture in the manifold, freeing hopper blocks, preset
time timing of cleaning cycle by electronic control etc.
Specialized Designs with
Changes in Physical Characteristic
Low headroom and other need-based physical changes are constantly being
introduced.
(Click Dust
Collection Information to see other resource topics in this section.)
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