Fuel Tech, Inc. is a technology company. The Company 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 manage nitrogen oxides (NOx) emissions in flue gas from boilers, incinerators, furnaces and other stationary combustion sources. The FUEL CHEM technology segment uses chemical processes in combination with computational fluid dynamics (CFD) and chemical kinetics modeling (CKM) boiler modeling, for the control of slagging, fouling, corrosion, opacity and other sulfur trioxide-related issues in furnaces and boilers through the addition of chemicals into the furnace.