Ultralean low swirl burner

Combustion – Process of combustion or burner operation – Flame shaping – or distributing components in combustion zone

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Details

431185, 122 14, 110260, F23M 304

Patent

active

057356815

ABSTRACT:
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.

REFERENCES:
patent: 4021188 (1977-05-01), Yamagishi et al.
patent: 4297093 (1981-10-01), Morimoto et al.
patent: 5092762 (1992-03-01), Yanig
patent: 5127821 (1992-07-01), Keller

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