A method for burning a fuel, containing chemically bound nitrogen, in a two-stage, rich-lean combustion process, including: introducing the fuel and at least one stream of primary air into a primary combustion region at a fuel-air ratio above the stoichiometric ratio and in a manner to intimately mix...http://www.google.es/patents/US4900246?utm_source=gb-gplus-sharePatente US4900246 - Apparatus for burning nitrogen-containing fuels
