Combustion – Process of combustion or burner operation – Flame shaping – or distributing components in combustion zone
Patent
1993-03-19
1998-04-07
Bennett, Henry A.
Combustion
Process of combustion or burner operation
Flame shaping, or distributing components in combustion zone
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
Bennett Henry A.
Martin Paul R.
Ross Pepi
The Regents University of California
Tinker Susanne C.
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