Dust Producing Sources 1'Material handling and processing a' Crushing, conveying, transferring, and

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Fugitive Dust Control
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Dust Producing Sources 1. Material
handling and processing a. Crushing,
conveying, transferring, and screening. 2.
Storage a. Dust produced by turbulent wind and
dry weather conditions. 3. Traffic a.
Vehicles and machinery produce dust by tires
coming into contact with the surface that
can be carried from an unpaved surface to a paved
surface.
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Confine, Seal and Suppress
Dust control is broken down into three phases.
Confine, Seal and Suppress. Only with the
combination of all three will you receive your
maximum ability to control dust on your site.
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1. Confine
Create enclosures using

• Dog houses
• Buildings (permanent or temporary)
• Wind screens
• Chute baffles

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Where and how to confine 4Transfer points
Dog houses and chute baffles 4Crushers
Wind screens or buildings 4Impact Areas
Impact and slider beds Impact and
slider beds will support the conveyor belt
for sealing. Eliminate the gap between
rollers allowing spillage of material and
formation of dust. This will ensure that
the conveyor has sufficient idler support
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Impact bed Utilize when gt 2 for rock
Slider bed Utilize when lt 2 for rock
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2. Seal
Flexiskirt At-Last-A-Seal Talon Seal Secondary
Seal

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Real-world solution
Flexiskirt Seal
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Why they work.
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Impact points cause 80 of fugitive dust.
Maximum sealing is found using a combination
defenses such as impact beds/sliders and seals.
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3. Suppress

• The moisture content of the material processed
  can have a
• substantial effect on emissions.
• Unfortunately, as crushing creates new fine
  particles, the moisture
• content is reduced by evaporation, diminishing
  the suppressive
• effect requiring a mechanical need for moisture
  enhancement.
• Facilities that use Agglomerative Dust
  Suppression systems to maintain relatively high
  material moisture contents can effectively
  control dust emissions.

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Primary Controls
Fogger Systems
Fogger systems, known as Agglomerative Systems,
moisten the dust particles increasing the density
and forcing the particles to settle at a faster
rate. Prevent the dust at the source, dont
try and capture it in the air.
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The collision between dust particles and water
droplets occur due to the following three factors

• Impaction/interception
• Droplet size/particle size
• Electrostatic forces

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Foggers forcing particles to settle through
atomized suppression
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How much water is too much?
Air velocity at a rate of 200 ft/min will allow
the best application for dust suppression.
This will provide maximum time for water droplets
to interact with the airborne dust.
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Q
Q Volume of induced air, ft3/min   Au
Upstream Area where air is induced into the
system, ft2   R Rate of material, ton/hr   S
Height of fall for material, ft   D Average
material diameter, ft
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Q
Q ? R 475 ton/hr A 3
ft2 S 10 ft D 0.167 ft
Q   Q 1973 ft3/min  
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Q AV or A Q/V A 1973 ft3/min 200
ft/minA 10 ft2 Dimensions 2 X 5
This will ensure the requirement for 200 ft/min
is accomplished.
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Secondary Controls
1. Belt Cleaners
4Longer belt, idler and pulley life 4Maintains
cleaner, safer facility 4Less maintenance 4Clean
er air
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Much of the spillage caused by carryback will
become airborne.
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Not the beach, but piles of carryback that either
will either result in immediate cleanup or
potential equipment damage.
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Arch Primary Belt Cleaners
Twister Tensioner Saber Primary Saber Channel
Mount Saber Max Super Saber Mini Saber
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Arch Secondary Belt Cleaners
Arch Saber Secondary RBS Secondary RGS
Secondary V-Plow Angle Plow
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Annual Spillage
42 Belt   4/1000 (paper thin material)   400
ft/min (belt speed)     V L x W x H   V 400
ft/min x 3.5ft x 0.00033ft 0.462 ft3/min   V
0.462 ft3/min x 60 min./hr 27.72 ft3/hr   V
27.72 ft3/hr x 10 hr/day 277.2 ft3/day   V
277.2 ft3/day x 250 day/yr 69,300
ft3/yr   Limestone broken 97 lbs./ ft3
  69,300 ft3/yr x 97 lbs./ ft3 6,722,100
lbs./yr   6,722,100 lbs./yr x 1 ton/2000lbs
3361 tons/yr  
 
134 (25-Ton trucks)
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2. Belt Alignment
Tri-Return Training Idler
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Steps to Complete Total Dust Control
1. Evaluate your plant and understand air
quality standards and your requirements. a.
Identify the standards for meeting air quality
regulations. b. Perform an inventory of your
emissions using AP-42 factors and visual
inspections. 2. Identify your dust control
problems and prioritize them by their
severity. 3. Identify your options for controls
necessary to maintain compliance. 4. Create a
budget for environmental controls necessary to
maintain compliance. 5. Delegate an on-site
project manager to accomplish tasks. 6. Perform
the installation of controls and monitor sources
to insure compliance. 7. Perform routine
maintenance to insure that all hardware is
maintained and functional.
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Be Prepared for Opacity Readings
Opacity readings are tested and utilized mainly
on smoke stack emissions Four areas of concern
are transfer stations, impactors, crushers, and
screens. Using the Confine, Seal and Suppress
system can result in a 50-80 decrease in annual
emissions.
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Is this EPAs impression of your plants
emissions?
In Compliance Out of Compliance
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• Operations using controls to reduce emissions

In Compliance
Still In Compliance
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• Increase your comfort level through
• dust abatement!
• Shorten permittingtime
• Enhance visibleemissions basedcompliance
• Reduceregulatoryhassles
• Increase communityacceptance

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• Clear Skies Ahead!
• Total Dust Control

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Phone [phone] Fax [phone] P.O. Box
1760 Paducah, Kentucky 42002 www.archenv.com.com