Fuel Tech, Inc. provides boiler optimization, efficiency improvement, and air pollution reduction and control solutions to utility and industrial customers worldwide. It operates in two segments, Air Pollution Control Technology and FUEL CHEM Technology. The Air Pollution Control Technology segment reduces nitrogen oxide (NOx) emissions in flue gas from boilers, incinerators, furnaces, and other stationary combustion sources by utilizing low and ultra low NOx burners; over-fire air systems; NOxOUT and HERT selective non-catalytic reduction systems; advanced selective catalytic reduction (SCR) systems; NOxOUT CASCADE and NOxOUT-SCR processes; ULTRA technology; and ammonia injection grid and graduated straightening grid systems. The FUEL CHEM Technology segment improves the efficiency, reliability, and environmental status of combustion units by controlling slagging, fouling, corrosion, opacity, and acid plume, as well as the formation of sulfur trioxide, ammonium bisulfate, particulate matter (PM2.5), carbon dioxide, and unburned carbon in fly ash through the addition of chemicals into the furnace using TIFI targeted in-furnace injection technology. This segment offers its FUEL CHEM program for plants operating in the electric utility, industrial, pulp and paper, waste-to-energy, university, and district heating markets, as well as to the owners of boilers, furnaces, and other combustion units. The company was founded in 1987 and is headquartered in Warrenville, Illinois.