Clean Stack Technologies

APTECH CST is pleased to present timely information of interest to owners and operators of utility and industrial equipment concerned with emissions. We believe there will be a strong demand for a cost-effective method for NOX, SOX, mercury, and chlorides emissions removal and slag prevention. APTECH CST technologies will greatly benefit units of any size unit but may be particularly attractive for smaller coal units where other technologies are cost prohibitive. We currently have two patents granted and one pending.

When compared to other available technologies,
APTECH CST is far ahead in
what can be delivered at a
cost-effective price.

APTECH CST technologies can benefit those operators concerned about emissions, coal switching, etc, but do not want to spend valuable resources for scrubbers, SCR, etc. We believe that oil-fired units would have a similar need. Gas-fired units could use the technology for NOX reduction.

APTECH CST has successfully demonstrated a low cost technology to reduce SO2, SO3, NOX, mercury, chlorides, and prevent slagging. Reducing the parasitic power will also improve heat rate and reduce CO2. With the same amount of money, these echnologies can reduce about 9 times the emissions. This should be especially attractive for coal units 300 MW or less that will find it hard to justify the installations of scrubbers and SCR systems.

APTECH CST is confident this is the most cost-effective best available technology for new or retrofit applications, and will be extremely useful, effective, and inexpensive compared to scrubbers and SCR systems, and mercury reduction. The time to install is short. The cost per quantity of emissions removed is extremely attractive. There is also the added benefit of not wasting power to run these expensive alternatives.


We have summarized below what we believe can be achieved with these technologies Additional tests are planned to verify reductions of mercury, SO3, and chlorides.

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  • Reduction of SO2 >70%
  • Reduction of NOX >70% without the use of catalyst (SNCR)
  • Reduction of SO3 close to 100%
  • Reduction of HCl close to 100%
  • Reduction of Mercury. Not tested yet but >60% is possible and will be tested soon
  • No waste water produced
  • Less than 0.4% parasitic power required (compared to > 2% for scrubber and SCR)
  • CO2 reduced by the difference in parasitic power
  • Energy to the grid increased by the difference in parasitic power
  • About 1/8th operating and maintenance cost
  • Capital cost about 1/10th cost of Scrubber and SCR on a medium sized unit
  • Prevent or greatly reduce slagging in upper furnace and convective section which will reduce outages and increase availability


For more information about how we can apply these technologies to meet your needs, please contact Steve Torbov or Terry Rettig or call 650/941-3292.

APTECH CST, LLC Main office location is in Sunnyvale, California — in the heart of Silicon Valley, San Francisco Bay Area. 650/941-3292

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