Pulp and Paper

Bail Breaker

paper recycle

Paper recycling facilities can create large amounts of fine dust. Dry Fog can be applied at the point of dust creation at Truck Tippers, Material Handling Transfer Points, De-wire Machines and Bail Breakers to agglomerate the dust as it is being generated, before it can escape into the building. Low flow Dry Fog Nozzles can be regulated to prevent material wetting. DustTamer and Vinyl curtains can be supplied to help contain the dust while it is agglomerated and falls back into the process.




Truck Tipper

Truck Tippers are commonly used at Pulp and Paper facilities for wood chips, sawdust and hog fuel. DSI has many years of experience in dealing with these difficult dust sources.

At the truck tipper, our system is designed to suppress dust using two stages of attack. First by filling the dump pocket with fog prior to the actual dump from the truck. This "pre-fog" will supply a reservoir of fog-charged air that, when displaced by the falling material will attach to the airborne dust particles and settle them out in the hopper due to their increased mass. To do this, the fog manifolds at the dump hopper activate as soon as the tipper platform starts to rise.

Stage two is the same foggers operating during the complete dump cycle until the platform rests back on the ground. This stage will attack the creation of additional dust at the dump as the truck continues to dump.

Dry Fog is also used at the hopper discharge to the take-away conveyor and transfer points down-stream.

Truck Tipper with no dust control
Dry Fog resevoir inside a Truck Tipper Hopper
Truck Tipper with Dry Fog System
Head Chute of Hog Fuel Conveyor

Conveyor Transfer Points can easliy generate concentrations of dust that exceed safe limits for both respirable and explosive dust. At Fuel Handling Systems, the risk of fires, explosions increase significantly with fuel sources like PRB Coal. Meeting Fire and Safety Regulations can be a challenge. However, there is a Dry Fog Solution.

Dry Fog works by injecting sub-micron water droplets into the air at the point of dust creation. The fog droplets attach to like size airborne dust particles. The slightly wetted particles agglomerate to other particles, adding sufficient mass to settle the dust back into the conveyed product within the covered transfer point. Used at truck tippers, screens, yard & plant conveyors, including reclaim, gallery, tripper conveyors and silos.

Nozzle fog Trans Alta Gallery
Dry Fog at load point of  Hog Fuel Bolier Feed Conveyor

Storage Piles

DustTamer installed at a wood chip storage pile

Preventing dust generation at Storage Piles is becoming an important issue. DustTAMER Wind Fence Systems can reduce the the amount of dust generated by stacking and working a storage pile.

DustTAMER is a much less expensive alternative to Domes and Buildings. Our fabric is designed to withstand winds in excess of 100 MPH and is resistant to the effects of UV Rays. Some installations are approaching 20 Years of service with no significant fabric deterioration.  DSI can help with the fence layout and supply the fabric and attachment hardware.

Fuel Pile Windfence offset for equipment access

Ash Handling

Airborne dust is "scrubbed" by a mass of micron sized droplets inside the truck bed

Controling dust from Ash Handling can be challenging. Adding enough moisture to the ash to prevent dust is difficult if not impossible. Mixing the ash with water often creates maintenance issues, including broken paddles and mixing screws.The Hydrophobic nature of ash typically results in some percentage of ash being over-wetted and the balance not wetted at all. Over-wetted ash spilled onto the ground drys out, creates a secondary source of dust and must be cleaned up. If used for structural landfill, over-wetting can take ash out of specification.Dry Fog Systems use very little water and can bring your operation into Environmental Compliance while meeting ash compaction specs. It will reduce the mess,and increase truck haul capacities. One plant has reduced haul trips by 19%. Big Savings!

Dry Fog systems can operate in temperatures well below freezing. The system can be protected from freezing and fog will not freeze in most environments. As the photos show, the fog is injected into the truck bed at the discharge point. The truck bed acts as reservoir for the fog to attach to the airborne dust particles as they try to escape from the truck bed area. The airborne dust particles become more cohesive and attach to other slightly wetted particles until the increase mass of the larger agglomerated dust particles makes them fall back into the truck bed.

Strip Curtains help direct Dry Fog into the truck bed creating a "Fog Reservoir"

DSI can provide Strip Curtains and DustTAMER Wind Screen materials and mounting hardware to help reduce the effects of ambient wind and displaced air form the ash being discharged into the truck.