Document Type and Number:
Japanese Patent JPS5646046
Kind Code:
B2
Abstract:
Fuel and less than the amount of air for stoichiometric combustion are injected into a combustion chamber so that the fuel rich mixture burns as a core in the combustion chamber. The balance of the air for substantially stoichiometric combustion is injected coaxially and rotationally as a sheath or vortex which surrounds the core. Where the core is hot and rich, there is little mixing of the sheath air and core gases and the available oxygen combines preferentially with fuel components other than nitrogen so that little nitrogen oxides are produced. After some heat is extracted from the gases in the core, more complete mixing of the sheath air and core gases occurs. Under these lean and cool combustion conditions, production of nitrogen oxides is also unsubstantial. Means for mixing the gas streams may be disposed adjacent the exit end of the combustion chamber when necessary to promote turbulence and further mixing of the air and hot gases for bringing about complete combustion of any residual combustibles. In the larger combustion systems within long furnaces means of promoting turbulence may not be required to complete combustion.
Application Number:
JP12128273A
Publication Date:
October 30, 1981
Filing Date:
October 30, 1973
Export Citation:
International Classes:
F23C99/00; F23C6/00; F23C6/04