Patent ID: 6394790
Filing Date: 2002-05-28
Classification: F23C,F23L,Y02E

Abstract:
A method for carrying out combustion while achieving reduced generation of nitrogen oxides comprising:(A) injecting primary fuel and primary oxidant into a combustion zone in a ratio within the range of from 5 to 50 percent of stoichiometric, said primary oxidant being a fluid having an oxygen concentration of at least 30 volume percent; (B) injecting secondary oxidant into the combustion zone at a point spaced from where said primary fuel and primary oxidant are injected into the combustion zone; (C) combusting primary oxidant and primary fuel mixed with products of complete combustion within the combustion zone separate from the secondary oxidant to produce combustion reaction products; (D) mixing secondary oxidant with combustion reaction products within the combustion zone and thereafter combusting secondary oxidant with combustion reaction products; and wherein said primary fuel is injected at a velocity sufficient to promote mixing with products of complete combustion in the combustion zone such that the temperature of combustion is lowered.