FTEK 2007 
FTEK featured
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AIR POLLUTION CONTROL NOxOUT® (brochure)
The NOxOUT® process is Fuel Tech's urea-based Selective Non-Catalytic Reduction (SNCR) process for reduction of oxides of nitrogen (NOx) from stationary combustion sources. The process requires precisely engineered injection of stabilized urea liquor into combustion flue gas temperatures as high as 2500ºF. Fuel Tech customizes the design and injection strategy for each application since most NOx reduction occurs in a temperature range between 1650ºF - 2100ºF. As diagrammed below, the injection is typically multi-level and controlled automatically to adjust urea injection in response to boiler load changes and changing furnace conditions.
Fuel Tech’s NOxOUT applications rely heavily on the use of Computational Fluid Dynamics (CFD) models and Chemical Kinetics Modeling and their resulting visualization utilizing proprietary software. Our NOxOUT SNCR technology is sufficiently flexible to apply to a variety of commercial and process combustion units, as detailed below.
Fuels
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- Refinery Crude Heaters and CO Boilers
- Sludge Combustors
- Industrial Power Boilers
- Municipal Waste Combustors
- Incinerators
- Circulating Fluidized Bed Boilers
- Stoker-Fired Boilers Burning Wood and Coal
- Package Boilers
- Tangentially-Fired Utility Boilers
- Cyclone-Fired Utility Boilers
- Wall-Fired Utility Boilers (wet & dry)
Process Combustion Units
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From a compliance standpoint, the NOxOUT process has been used to satisfy Best Available Control Technology (BACT) requirements for Municipal Solid Waste combustors, coal-fired Independent Power Producer (IPP) units, and fluidized bed boilers. The process has been used to comply with Reasonably Available Control Technology (RACT) requirements in ozone non-attainment areas and Administrative Compliance Orders in specific locales.
A primary feature of the NOxOUT process is the ease of combination with other NOx reduction technologies. Combinations that have been retrofit with the NOxOUT process are low NOx burners, overfire air, combustion tempering, neural network controls, and gas reburn. Fuel Tech’s patented NOxOUT CASCADE® process combines the NOxOUT SNCR process with a compact Selective Catalytic Reduction (SCR) component to provide SCR-type reductions at a fraction of the cost of conventional SCR systems.