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Title: 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:
 [1]
  1. (Kensington, CA)
Issue Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA
OSTI Identifier:
871456
Patent Number(s):
5735681
Assignee:
Regents, University of California (Oakland, CA) LBNL
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 = {1998},
month = {1}
}

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