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Method and apparatus for reducing the nitrogen oxide component from the oxygen-poor combustion products of a hydrocarbon fuel combustion device, which product would ordinarily contain an undesirable excess quantity of oxides of nitrogen. The method and apparatus include the means for associating gas

Method and apparatus for reducing the nitrogen oxide component from the oxygen-poor combustion products of a hydrocarbon fuel combustion device, which product would ordinarily contain an undesirable excess quantity of oxides of nitrogen. The method and apparatus include the means for associating gaseous hydrocarbon compounds in said products of combustion at a sufficiently high temperature in a related selected contained volume such that a degree of acceleration of the reduction of oxides of nitrogen is obtained so that the NO is reduced to an acceptable level within a selected reaction time related to said volume which reaction time, volume and temperature are reasonably associated with or present within said combustion device.

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In a hydrocarbon-fueled combustion device wherein oxygen-starved combustion products contain an excess of nitrogen oxide relative to an equilibrium value defined by the pressure, temperature and composition parameters of said products of combustion, the improvement which consists of: a source of unb

In a hydrocarbon-fueled combustion device wherein oxygen-starved combustion products contain an excess of nitrogen oxide relative to an equilibrium value defined by the pressure, temperature and composition parameters of said products of combustion, the improvement which consists of: a source of unburned hydrocarbon, mixing means for producing a mixture of said oxygen-starved combustion products and a quantity of unburned hydrocarbon from said source, and means for maintaining said mixture at a temperature of at least 2200 degrees Rankine thereby reducing the level of nitrogen oxide toward its equilibrium value. The method for reducing the oxides of nitrogen contained in the oxygen-starved combustion products of a hydrocarbon fuel combustion device, said oxides of nitrogen having an excess concentration relative to an equilibrium value defined by the pressure temperature and composition parameters of said products of combustion, which consists of (a) mixing with said oxygen-starved combustion products a given quantity of hydrocarbon at a time when the oxides of nitrogen exceed the equilibrium value; and (b) maintaining the resultant mixture at a temperature of at least 2200 degrees Rankine for a period of time to effect a desired accelerated reduction of the oxides of nitrogen toward the equilibrium value.