Fuel Tech, Inc. is a technology company. It is engaged in the development, commercialization, and application of technologies for air pollution control, process optimization, combustion efficiency and engineering services. It operates through two segments: Air Pollution Control technology and FUEL CHEM technology. The Air Pollution Control technology segment includes technologies to reduce oxides of nitrogen (NOx) emissions in flue gas generated by the firing of natural gas or coal from boilers, incinerators, furnaces and other stationary combustion sources. These include Over Fire Air systems, NOxOUT and HERT Selective Non-Catalytic Reduction systems, and Selective Catalytic Reduction systems. The FUEL CHEM technology segment uses chemical processes in combination with advanced computational fluid dynamics and chemical kinetics modeling boiler modeling, for the control of slagging, fouling, corrosion, opacity and other sulfur trioxide-related issues in coal-fired furnaces and boilers.