Patent ID: 6910879

Claim:
A method of combustion in a furnace comprising the steps of: i) injecting at least one fuel and at least one oxidizer separately, wherein said oxidizer comprises a primary oxidizer stream and a secondary oxidizer stream, wherein said primary oxidizer stream is further divided into at least two portions, wherein the first is a rapid-mixing stream and the second is a slow-mixing stream; ii) injecting the first rapid-mixing stream close to the fuel whereby generating a first incomplete combustion rapidly; iii) injecting the second slow-mixing stream at a distance d 1 from said first rapid-mixing stream, whereby the mixing of fuel and oxidizer occurs less rapidly than that of the first incomplete combustion; and iv) injecting said secondary oxidizer stream downstream from said primary oxidizer stream whereby entering into combustion with the portion of fuel that is diluted by the unreactive gases from the first incomplete combustion.