• dry fog
  • coal chute
  • codero plow with fog
  • Wind screen, steel beams with screen
  • Wood fog in hopper Shasta Energy
  • wind fence coal
  • Dry Fog™ Dust Suppression

    Ship Loader
  • Dry Fog™ Dust Suppression

    Silo Fill Conveyors at a Coal Fired Power Plant
  • Dry Fog™ Dust Suppression

    Reclaim Feeder for a Coal Mine
  • DustTamer™ Wind Fence

    Protecting a Mine Tailings Stockpile
  • Dry Fog™ Dust Suppression

    Truck Tipper for a Biomass Power Plant
  • DustTamer™ Wind Fence

    Protecting a Stockpile
Rail__Truck_Dumps
Dry Fog at Rollover Rail Car Dumper

Truck Dumps Rail Car Dumps can be a very significant source of dust. Collecting dust from large open dump pockets is very difficult. Cost for collection systems can exceed $1,000,000 and still the user is faced with what to do with the collected dust. Chemical systems require use of expensive chemicals and are not effective in removing dust from the air. Furthermore, chemical water sprays create large water droplets that will freeze, making wintertime operations in many regions impossible. Dry Fog™ Systems can effectively capture airborne dust, returning it to the dump pocket, without wetting the material. Dry Fog will not freeze and can operate in temperatures as low as –35% F.

DSI has provided fogging systems to various types of mines including Coal, Copper, Gold, Sliver, Zinc and more.  Applications range from front end loader dunps to large 340 ton haul trucks dumping into primary crushers.

primary-crusher-1
Start of Dry Fog at a Primary Crusher Truck Dump

Dock-Hopper-CroppedHoppers located near waterways face certain challenges. Regulations often require that no dust or materials from the hopper loading operation enter the water. Areas near waterways often have increased wind conditions that complicate controlling the dust. DSI combines Dry Fog System technology with DustTamer Wind Screen Systems as shown in the photo. The DustTamer fabric screen is installed on the perimeter of the hopper typically on three sides. The DustTamer fabric serves several purposes:Smelter-Dust-Hopper-Windscreen

  1. Due to the fabrics engineered porosity, ambient wind is directed away from the hopper pocket by allowing some air bleed-through that equalizes the pressure on both sides of the screen. The equalization of pressure outside to inside the hopper prevents the wind from rushing into the hopper and instead passes by the hopper seeking out lower pressure zones. If a solid material with no porosity is used in-place of the porous screen, the wind will hit the solid wall and seek out the low pressure zone inside the hopper, forcing the dust out of the pocket.
  2. This same pressure equalization effect allows for the Dry Fog to stay in the pocket along with the airborne dust for a long enough period of time for the micron size fog droplets to attach to like size airborne dust particles. The agglomerated particles increased mass will make the slightly wetted particles to fall back into the hopper without wetting the material inside the hopper.
  3. The fabric will also help capture larger wetted particles that due to there mass and velocity try to escape the containment area.
  4. If the loading of the hopper is from a large and sudden dump (grab bucket or E-Crane) the screen helps contain the fog that is generated at the hopper prior to the dump. This Pre-fog provides a large reservoir of fog droplets in a high concentration that scrubs the air when the dump occurs and air displacement projects dust particles into the air.
    alt GreenPort Magazine Article Nov/Dec 2008 149.95 Kb

    Dock-Hopper-CroppedHoppers located near waterways face certain challenges. Regulations often require that no dust or materials from the hopper loading operation enter the water. Areas near waterways often have increased wind conditions that complicate controlling the dust. DSI utilizes it Dry Fog System in conjunction with DustTamer Wind Screen Systems as shown in the photo. The DustTamer fabric screen is installed on the perimeter of the hopper typically on three sides. The fabric serves several purposes:

    1. Due to the fabrics porosity, ambient wind is directed away form the hopper pocket by allowing some air bleed through that equalizes the pressure on both sides of the screen. If the screen were solid the wind will hit the solid wall and seek out the low pressure inside the hopper. This air movement pushes the dust out of the pocket.
    2. This same pressure equalization effect allows for the Dry Fog to stay in the pocket along with the airborne dust for a long enough period of time for the micron size droplets to attach to like size airborne dust particles. The agglomerated particles will then fall back into the hopper without wetting the material.
    3. The fabric will also help capture larger particles that become airborne form the the loading of the hopper.
    4. If the loading of the hopper is from a large and sudden dump (grab bucket or E-Crane) the screen helps contain the fog that is generated at the hopper prior to the dump. This "pre-fog" provides a large reservoir of fog droplets in a high concentration that scrubs the air when the dump occurs and air displacement can project dust particles into the air.

    pdf Green Port Magazine Article on Dry Fog Dust Suppression

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