Method of combusting nitrogen-containing fuels

Details Method of combusting nitrogen-containing fuels Method of combusting nitrogen-containing fuels

F - Mech Eng,Light,Heat,Weapons

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F23N 1/02 (2006.01) F23C 6/00 (2006.01) F23C 6/04 (2006.01) F23C 13/00 (2006.01)

Patent

CA 1054919

METHOD OF COMBUSTING NITROGEN- CONTAINING FUELS Abstract of the Invention A method for combusting nitrogen-containing fuel by: combusting a first fuel-air mixture in the presence of a catalyst in a first stage, operated fuel-rich so that the amount of air in the first stage is substantially less than the amount needed for complete combustion; adding additional air to the effluent gas from the first stage to form a second mixture with an amount of air at least sufficient to combust fully the effluent from the first stage; and then combusting the second mixture in a second stage. The first mixture is sufficiently fuel-rich, and the second mixture contains sufficient additional air, so that the combustion tempera- ture in the first stage is below a temperature that would result in any substantial formation of oxides of nitrogen or other fixed nitrogen compounds from atmospheric nitrogen present in the mixture being combusted, and the second stage temperature also is below that for substantial nitrogen oxide formation therefrom. The method serves to suppress formation of nitrogen oxides from the nitrogen-containing compounds in the fuel.

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