Ultralean low swirl burner
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.
- Inventors:
-
- Kensington, CA
- Issue Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- OSTI Identifier:
- 871456
- Patent Number(s):
- 5735681
- Assignee:
- Regents, University of California (Oakland, CA)
- Patent Classifications (CPCs):
-
F - MECHANICAL ENGINEERING F23 - COMBUSTION APPARATUS F23C - METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN {A CARRIER GAS OR} AIR
F - MECHANICAL ENGINEERING F23 - COMBUSTION APPARATUS F23D - BURNERS
- DOE Contract Number:
- AC03-76SF00098
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- ultralean; swirl; burner; novel; method; invented; burns; ultra; lean; premixed; fuel-air; mixture; stable; flame; inventive; burning; results; efficient; emissions; pollutants; oxides; nitrogen; previous; burners; methods; imparts; weak; 01; flow; stream; recirculation; causes; annulus; region; immediately; inside; perimeter; rotate; plane; normal; axial; rotation; diameter; increase; concomitant; decrease; velocity; stabilizes; equals; rate; resulting; turbulent; plane normal; air flow; flow velocity; air mixture; fuel-air mixture; axial flow; flow stream; inventive method; lean premixed; method results; mixed fuel; swirl burner; premixed fuel; /431/110/122/126/
Citation Formats
Cheng, Robert K. Ultralean low swirl burner. United States: N. p., 1998.
Web.
Cheng, Robert K. Ultralean low swirl burner. United States.
Cheng, Robert K. Thu .
"Ultralean low swirl burner". United States. https://www.osti.gov/servlets/purl/871456.
@article{osti_871456,
title = {Ultralean low swirl burner},
author = {Cheng, Robert K},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1998},
month = {Thu Jan 01 00:00:00 EST 1998}
}