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AssigneeNoxtech, Inc.
InventorsBruce C. Sudduth, Ralph J. Slone, Vishwesh Palekar, Madhu Ramavajjala
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Gas-phase methods and systems for reducing NOx emissions and other contaminants in exhaust gases, and industrial processes using the same, are disclosed. In accordance with the present invention, hydrocarbon(s) autoignite and autothermally heat an exhaust gas from an industrial process so that NH.sub.3, HNCO or a combination thereof are effective for selectively reducing NOx autocatalytically. Preferably, the reduction of NOx is initiated/driven by the autoignition of hydrocarbon(s) in the exhaust gas. Within the temperature range of about 900-1600.degree. F., the introduced hydrocarbon(s) autoignite spontaneously under fuel-lean conditions of about 2-18% O.sub.2 in the exhaust gas. Once ignited, the reactions proceed autocatalytically, heating the exhaust gas autothermally.
A method for reducing NOx from an exhaust gas, comprising autothermally heating the exhaust gas using one or more hydrocarbons in the presence of NH.sub.3, HNCO or a combination thereof, wherein the autothermal heating results in autocatalytic conditions effective for NOx reduction by NH.sub.3 and/or HNCO.
A method comprising the steps of:
A method for selectively reducing oxides of nitrogen in an exhaust gas using NH.sub.3, HNCO or a combination thereof while hydrocarbons(s) autoignite and heat the exhaust gas autothermally to a temperature in the range of about 1400-1550.degree. F., sustaining autocatalytic reactions that substantially deplete residual concentrations of unburned hydrocarbons, CO, HNCO and NH.sub.3.
Dependencies are inferred from the claim text.