FIR BURNER TARGETS NOx REDUCTION IN THE STEEL INDUSTRY

摘要

Under more stringent environmental regulations, the U.S. steel industry is positioned tornaddress NOx control at its steelmaking facilities. A significant part of NOx emissions comes fromrngas-fired boilers. In steel plants, byproduct gases – blast furnace gas and coke oven gas – arernwidely used together with natural gas to fire furnaces and boilers. GTI plans to expand its highlyrnsuccessful low-Nox forced internal recirculation (FIR) burners, which have been developed forrnnatural gas-fired boilers, into facilities that utilize these fuels. For natural gas firing, thesernburners have been shown to reduce NOx emissions from typical uncontrolled levels of 80-100rnvppm to single-digit levels (9 vppm). This is done without the efficiency penalties incurred byrnalternative NOx control methods such as external flue gas recirculation and water injection. Thisrnpaper will address the development and demonstration of a simple, low-cost, energy-efficientrnburner that can reduce NOx by more than 90%.