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Effect of CO2 Dilution on Flame Structure and Soot and NO Formations in CH4-Air Nonpremixed Flames

[+] Author and Article Information
Arindam Samanta

Department of Marine Engineering, Institute of Technology and Marine Engineering, South 24 Parganas, 743 368, West Bengal, India

Ranjan Ganguly, Amitava Datta

Department of Power Engineering, Jadavpur University, Salt Lake Campus, Kolkata 700 098, India

J. Eng. Gas Turbines Power 132(12), 124501 (Aug 24, 2010) (5 pages) doi:10.1115/1.4001809 History: Received January 27, 2010; Revised March 09, 2010; Published August 24, 2010; Online August 24, 2010

In the present work, a numerical analysis has been presented to show the variations in flame structure, flame radiation, and formations of soot and NO in methane-air laminar nonpremixed flames with different CO2 dilutions of fuel. It is observed that the flame length reduces as the dilution of the fuel stream by CO2 increases while maintaining constant fuel jet velocity at the burner tip. However, the flame length remains almost unchanged with different blends of CH4 and CO2 if the burner loading (i.e., fuel flow rate×heating value of fuel) is kept constant. Both soot and NO formations decrease monotonically when the CO2 fraction in the fuel is increased. The radiation from the flame also decreases when CO2 dilution of the fuel is increased, particularly, when the fuel jet velocity is maintained constant.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 1

Flame structure and temperature (K) distribution in the nonpremixed methane flame

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Figure 2

Variation in normalized flame length against methane mass fraction in the inlet fuel stream (flame length is normalized against the length of 100% methane flame): R2 value given in the figure represents the goodness of linear fit

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Figure 3

The difference (Tmethane−Tdiluted) of the local temperature fields produced by methane flame and the flames with 30% CO2 diluted fuel at (a) constant jet velocity and (b) constant burner loading

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Figure 4

Soot volume fraction (ppm) for (a) methane flame and (b) flames with 30% CO2 diluted fuel. In (b), the left half corresponds to the constant jet velocity case while the right half corresponds to the constant burner loading with methane.

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Figure 5

Volumetric generation rate (kmol m−3 s−1) of NO in the flame (left half) and the distribution of NO mass fraction across the flame zone (right half) in (a) methane flame and (b) methane with 30% CO2 at constant jet velocity



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