Environmental
Fly Ash Technologies
Vacuum, pressure and combination systems
Fly Ash Systems
Pugmill Recycler
- Provides an economical way to recycle FGD water in the fly ash which is sent to the landfill for disposal
- Minimizes fugitive dust during operation by using flexible isolation curtains
- Optimal mix to avoid unabsorbed water in transport vehicle
- Overlapping paddle configuration minimizes ash buildup
- Nozzles specifically target mixing area with fine mist of water
- Easy access for routine maintenance
- Water meter and valve for precise water flow control
Vacuum System
- Uses air as transport media below atmospheric pressure to entrain and convey material
- Vacuum source is located at the discharge end of the conveying system
- Ideal for shorter transport distances (< 1500 ft)
- Safest design for indoor and hazardous environments
- Uses fewer components
- Less clearance required under hoppers
- Low initial system cost
Vacuum/Pressure Combination System
- Used for long conveying distances where vacuum system benefits are desirable in confined or hazardous locations, then transfer to pressure system for long distance
- Initial material discharge from hoppers is by a vacuum system
- Requires an intermediate collection vessel/transfer station
- Pressurized conveyance system to storage silo
Pressure System
- Can convey over longer distances (1000 to 10,000 ft
- Simpler ash/air separation equipment at the storage silo
- Airlock is required to transfer material from collecting hoppers to high pressure conveying line
- Lower cost silos and related equipment
- Lower operating costs
- Eductor-based pneumatic system available for special applications
Dense-Phase Transport System
- Variation of pressurized system but operates at higher ash-to-air ratios
- Smaller transport line sizes, for intermediate material transport rates, will often be the lowest initial and operating cost system
- Long distance conveyance, same capabilities as pressure transport systems