초록 ▼

A novel burner and burner method has been invented which burns an ultra lean premixed fuel-air mixture with a stable flame. The inventive burning method results in efficient burning and much lower emissions of pollutants such as oxides of nitrogen than previous burners and burning methods. The inven

A novel burner and burner method has been invented which burns an ultra lean premixed fuel-air mixture with a stable flame. The inventive burning method results in efficient burning and much lower emissions of pollutants such as oxides of nitrogen than previous burners and burning methods. The inventive method imparts weak swirl (swirl numbers of between about 0.01 to 3.0) on a fuel-air flow stream. The swirl, too small to cause recirculation, causes an annulus region immediately inside the perimeter of the fuel-air flow to rotate in a plane normal to the axial flow. The rotation in turn causes the diameter of the fuel-air flow to increase with concomitant decrease in axial flow velocity. The flame stabilizes where the fuel-air mixture velocity equals the rate of burning resulting in a stable, turbulent flame.

대표청구항 ▼

[ I claim:] [1.] A method of burning fuel efficiently and with minimal emission of pollutants comprising,a) injecting fuel continuously into a mixing zone;b) injecting an oxygen-containing gas continuously into said mixing zone to produce a fuel and gas mixture which flows in a stream toward an exit

[ I claim:] [1.] A method of burning fuel efficiently and with minimal emission of pollutants comprising,a) injecting fuel continuously into a mixing zone;b) injecting an oxygen-containing gas continuously into said mixing zone to produce a fuel and gas mixture which flows in a stream toward an exit;c) swirling the resulting fuel and gas mixture downstream of said mixing zone using swirling means with sufficient force to impart rotational motion to the periphery of, and in a plane normal to the flow of, said fuel and gas stream, but without inducing recirculation therein;d) burning said swirling mixture downstream of the mixing zone and swirling means.