Logo


Our Proprietary Separation Solution

Why Separation Technologies’ Electrostatic Process is the best solution

Our electrostatic technology processes high carbon fly ash to make it usable in concrete. The difference in our technology is that we do this in an eco-friendly manner that requires no additional chemicals and produces no emissions. This technology has many business advantages for power plants, since it is the most flexible, cleanest, fly ash processing solution, with the longest record of proven commercial success. 

 

Unlike other technologies, electrostatic technology is:

  • Fully proven, fully commercialized, and fully operational across many plants and discrete separator units.
  • Compact, clean, and requires a relatively small footprint at the power plant site.
  • Much lower-cost than any alternative solution.
  • Much more flexible in dealing with future developments.

Electrostatic separation process also has many technology advantages:

  • Each separator can process up to 40 tons of fly ash per hour, which means that one separator can meet most plant/market requirements and a second or third separator can be easily and cost effectively added to handle any plant/market situation.
  • The separator uses very low power to operate, consuming 1-2 kWh for each processed ton
  • The separator process generates no gas or liquid emissions
  • The separator also produces a high carbon product that can be readily reburned, to recover the fuel value of the unburned carbon.
  • The electrostatic separator can readily process a wide range of fly ash LOIs (Loss on Ignition, or unburned carbon content) — from 30% on down — producing a consistent 2% LOI product that easily meets all standards for use in concrete.

The ProAsh product delivered is of consistent quality e.g. 2% +/- 1/2% LOI,
from a variable LOI feed stock

Our processed fly ash meets all ASTM C-618 /AASHTO M295 specifications and state DOT requirements.

How Our Technology Works

Our separation technology follows this process:

  • Fly ash is fed into a thin gap between parallel planar electrodes
  • Unburned carbon particles in ash take on positive (+) charges; minerals take on negative (-) charges through particle-to-particle contact
  • Charged particles are attracted to electrode plate of opposite charge
  • High speed open mesh belt moves differently charged particles in opposite directions

 

Our Ammonia Solution: Why and How?

In recent years, more coal plants have committed to emissions control measures to manage NOx or particulate emissions, which expose the plant’s fly ash to ammonia. These emission control measures include Selective Catalytic Reduction or Selective Non Catalytic Reduction systems to control NOx emissions; and flue gas conditioning systems to improve electrostatic precipitator efficiency. Operation of these systems may mean that the fly ash would contain ammonia. Concentrations of ammonia on fly ash at levels of 100 parts per million (ppm) or greater is unacceptable in the concrete market, because the chemical reactions in the poured concrete could create unpleasantly strong ammonia gas odors.

  • To meet this important need, we developed a patented Ammonia Removal Process that is capable of reducing ammonia on ash from more than 2,000 ppm to less than 50 ppm. The end product fly ash meets ASTM C-618 specifications as a high performance concrete additive; the process safely recycles ammonia back to the utility.
  • This breakthrough technology can be installed as a stand-alone operation or combined with our carbon removal process in a single installation. The ammonia removal system enables power plants to continue to meet their goals for recycling and/or environmentally benign disposal of fly ash.
  • One of the key benefits of our ammonia removal process is its flexibility. Many power plants do not yet know, specifically, how SCRs will impact their coal combustion byproducts or how they will change out catalysts. For these power plants, our ammonia removal process is easily accessible if and when it is needed, without forcing a premature decision — and unnecessary costs or risk.

 

 

_______________________________________________________

©Separation Technologies LLC. 2008 All rights reserved.
ProAsh is a registered trademark of Separation Technologies LLC.
Terms of Use | Privacy Statement