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NATURAL GAS REBURNING FOR NOX CONTROL ON A CYCLONE-FIRED BOILER
Citation:
Hall, R., R. Borio, R. Lewis, AND R. Booth. NATURAL GAS REBURNING FOR NOX CONTROL ON A CYCLONE-FIRED BOILER. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/D-91/146.
Description:
The paper discusses natural gas reburning (fuel staging) for nitrogen oxide (NOx) control on a cyclone-fired boiler. eburning is an in-furnace NOx combustion modification technology that has been shown to reduce NOx by 50-60%. eburning is accomplished by injecting fuel downstream of the primary combustion zone, creating a reducing zone in which NOx formed in the primary zone reacts with hydrocarbon radicals to form molecular nitrogen and water vapor. Burnout air is added downstream of the reburn zone to complete the combustion process at a lower temperature. ench- and pilot-scale tests in the l980s provided results on the importance of stoichiometry in the reburn zone, residence time, and the fuel nitrogen content of the reburn fuel. o apply reburn technology to a full-scale boiler, a reburn demonstration has been initiated on a 108 MWe cyclone-fired boiler at Ohio Edison's Niles station. yclone boiler was selected because it is an inherently high NOx emitter and most low NOx combustion modification technologies are not applicable to cyclone and other wet-bottom boilers. arametric tests have shown that NOx can be reduced by 50-60% with acceptable boiler operation by injecting natural gas into the reburn zone to account for 15-18% (fuel equivalent) of the boiler's heat load.