Dewatering Bins

Dewatering Bins allow storage of bottom ash for up to several days before unloading. Water drains from the bins through stainless steel dewatering screens. When dewatering is complete ash is discharged into trucks, rail cars, or barges for final disposal.

  • Custom designed & sized to meet customer storage & discharge requirements
  • Highly efficient operation – bin design, with inlet baffle and strategically located dewatering screens, minimizes ash carryover
    • Full diameter overflow weir with baffle ring minimizes ash carryover
    • Removable/replaceable target plate and inlet baffle controls reduce turbulence
    • Center & lower dewatering elements enhance the dewatering process and minimize carryover of fines
    • Back flush nozzles keep lower screens clear of fines
    • Hydraulic cylinder-operated discharge gates assure simple, dependable unloading operation; a specially engineered, low-leak gate is available as an option.
  • Reduced replacement costs –
    • Stainless steel dewatering screens resist corrosion
    • Heavy plate steel construction allows for corrosion and extends service life
  • Lower erection costs – plate steel portions of the bins are pre-assembled, match marked and shipped knocked down in easy to handle sections
  • Reduced danger of failure in cold climates – optional bin heaters provide freeze protection

  1. Where are Dewatering bins used?[+]

    Since Dewatering bins remove most of the water from the ash, they can be used wherever ash ponds are not available or where ever a “dry” bottom ash solution is required.

  2. How many Dewatering bins are necessary?[+]

    In most installations, UCC recommends two redundant Dewatering bins to allow for one to dewater while the other fills & stores material.

  3. What is a center dewatering element and how does it affect efficiency?[+]
    Water from the ash. UCC developed the center dewatering element to work along with the other dewatering elements, and it extends down through the center of the bin. It is constructed of stainless steel screen sections on a carbon steel support structure. In typical applications, the addition of center dewatering elements has reduced dewatering times by more than 50%. Reduced Dewatering Time = Increased Bin Availability
  4. How can ash carry over and plugging be minimized? [+]

    Dewatering bin elements are located in the center of the bin where the coarse ash settles. As the water drains toward the center of the bin, the pile of coarse ash acts as a filter bed capturing the finer particles before they reach the center. Therefore, ash retention is improved, resulting in minimized carryover.

  5. What is the optimum dewatering sequence? [+]

    Optimum dewatering can be achieved by first using the lower external elements to drop the water level below the apex of the ash cone. Then, while the lower elements remain open, the center dewatering element drain is opened to speed dewatering without allowing excessive amounts of particulate carryover.

Submerged Flight Conveyor

The Submerged Flight Conveyor (SFC) is a proven bottom ash system and the most cost-effective compared with other alternatives.

 

Pneumatic Systems

UCC pioneered the first dry bottom ash system using pneumatic technology in 1920. The PAX Pneumatic Ash Extractor added new technology to this time-proven vacuum system design and offers many benefits over wet bottom ash systems.

Vibratory Systems

The VAX system is the latest evolution in dry bottom ash technology which delivers superior heat recovery, lower installed cost, higher reliability and less maintenance compared with conventional moving belt designs.

 

Recirculation

Ideal for converting wet sluice systems into a “dry” ash system without change to the existing bottom ash hoppers.