Fuel Tech, Inc. is engaged in the development, commercialization, and application of technologies for air pollution control, process optimization, combustion efficiency and engineering services. Its segments include Air Pollution Control technology and FUEL CHEM technology. 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. The FUEL CHEM technology segment 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 through chemicals into the furnace using TIFI Targeted In-Furnace Injection technology.