Stability and Global Emission Characteristics of Elliptic Burner Diffusion Flames in an Elliptic Co-Flow

2007 ◽  
Author(s):  
Sathish Chinthamony ◽  
Chendhil Periasamy ◽  
Subramanyam Gollahalli
Keyword(s):  
Diffusion Flames ◽  
Emission Characteristics ◽  
Global Emission

Effect of Elliptical Burner Geometry on Stability and Global Emission Characteristics of Pre-Mixed Flames

2002 ◽  
Author(s):  
Benjamin D. Baird ◽  
S. R. Gollahalli
Keyword(s):  
Aspect Ratio ◽  
Emission Reduction ◽  
Pollutant Emission ◽  
Emission Characteristics ◽  
Global Emission ◽  
Harmful Emissions ◽  
Reduction Of Emissions ◽  
Fuel Mixtures ◽  
The Stability ◽  
Stability Results

An important topic in combustion research today is pollutant emission reduction. With the current demand for large amounts of economical, clean power, there is a need for research in both the increase of combustion performance and the reduction of emissions. Two methods of the so-called ‘passive’ flame controls are the use of premixing the air and fuel and the variation of the geometry of the flame. Both mechanisms offer the promise of increasing efficiency as well as reducing harmful emissions. However, the effect of these controls on the stability of the flame has not been fully studied. This paper will attempt to fill in some of this gap and will study the effects of elliptical burner geometry on premixed flames. The study will present stability results for circular and 4:1 aspect ratio elliptical burner geometry for a range of fuel mixtures of propane and hydrogen. The paper will also report the emission indices of CO and NO of the 40% by mass hydrogen in propane mixture. It was found that the 4:1 aspect ratio burner had reduced blow-out stability, produced a much shorter flame, and, in general, produced more carbon monoxide and less nitric oxide than a circular burner.

NOx emission characteristics of counterflow syngas diffusion flames with airstream dilution

Fuel ◽  
2006 ◽  
Vol 85 (12-13) ◽  
pp. 1729-1742 ◽  
Author(s):  
D GILES ◽  
S SOM ◽  
S AGGARWAL
Keyword(s):  
Diffusion Flames ◽  
Nox Emission ◽  
Emission Characteristics

scholarly journals Numerical Study of the Structure and NO Emission Characteristics of N2- and CO2-Diluted Tubular Diffusion Flames

Energies ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1490
Author(s):  
Harshini Devathi ◽  
Carl A. Hall ◽  
Robert W. Pitz
Keyword(s):  
Diffusion Flames ◽  
Numerical Study ◽  
Reaction Pathway ◽  
Flame Structure ◽  
Reaction Rates ◽  
No Production ◽  
Emission Characteristics ◽  
No Emission ◽  
Nitrogen Radicals ◽  
Lower Temperature

The structure of methane/air tubular diffusion flames with 65 % fuel dilution by either CO2 or N2 is numerically investigated as a function of pressure. As pressure is increased, the reaction zone thickness reduces due to decrease in diffusivities with pressure. The flame with CO2-diluted fuel exhibits much lower nitrogen radicals (N, NH, HCN, NCO) and lower temperature than its N2-diluted counterpart. In addition to flame structure, NO emission characteristics are studied using analysis of reaction rates and quantitative reaction pathway diagrams (QRPDs). Four different routes, namely the thermal route, Fenimore prompt route, N2O route, and NNH route, are examined and it is observed that the Fenimore prompt route is the most dominant for both CO2- and N2-diuted cases at all values of pressure followed by NNH route, thermal route, and N2O route. This is due to low temperatures (below 1900 K) found in these highly diluted, stretched, and curved flames. Further, due to lower availability of N2 and nitrogen bearing radicals for the CO2-diluted cases, the reaction rates are orders of magnitude lower than their N2-diluted counterparts. This results in lower NO production for the CO2-diluted flame cases.

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