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Title: The effect of oxygen enrichment on soot formation and thermal radiation in turbulent, non-premixed methane flames

Abstract

Non-premixed oxy-fuel combustion of natural gas is used in industrial applications where high-intensity heat is required, such as glass manufacturing and metal forging and shaping. In these applications, the high flame temperatures achieved by oxy-fuel combustion increase radiative heat transfer to the surfaces of interest and soot formation within the flame is desired for further augmentation of radiation. However, the high cost of cryogenic air separation has limited the penetration of oxy-fuel combustion technologies. New approaches to air separation are being developed that may reduce oxygen production costs, but only for intermediate levels of oxygen enrichment of air. To determine the influence of oxygen enrichment on soot formation and radiation, we developed a non-premixed coannular burner in which oxygen concentrations and oxidizer flow rates can be independently varied, to distinguish the effects of turbulent mixing intensity from oxygen enrichment on soot formation and flame radiation. Local radiation intensities, soot concentrations, and soot temperatures have been measured using a thin-film thermopile, planar laser-induced incandescence (LII), and two-color imaging pyrometry, respectively. The measurements show that soot formation increases as the oxygen concentration decreases from 100% to 50%, helping to moderate a decrease in overall flame radiation. An increase in turbulence intensity hasmore » a marked effect on flame height, soot formation and thermal radiation, leading to decreases in all of these. The soot temperature decreases with a decrease in the oxygen concentration and increases with an increase in turbulent mixing intensity. Altogether, the results suggest that properly designed oxygen-enriched burners that enhance soot formation for intermediate levels of oxygen purity may be able to achieve thermal radiation intensities as high as 85% of traditional oxy-fuel burners utilizing high-purity oxygen.« less

Authors:
 [1];  [1]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1326771
Alternate Identifier(s):
OSTI ID: 1419562
Report Number(s):
SAND-015-7299C
Journal ID: ISSN 1540-7489; PII: S154074891630164X
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Proceedings of the Combustion Institute
Additional Journal Information:
Journal Volume: 36; Journal Issue: 3; Conference: Proposed for presentation at the Fall 2015 Meeting of the Western States Section of the Combustion Institute, Provo, UT (United States), 5-6 Oct 2015; Journal ID: ISSN 1540-7489
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 03 NATURAL GAS; oxy-fuel; flame; methane; soot; radiation

Citation Formats

Shaddix, Christopher R., and Williams, Timothy C. The effect of oxygen enrichment on soot formation and thermal radiation in turbulent, non-premixed methane flames. United States: N. p., 2016. Web. https://doi.org/10.1016/j.proci.2016.06.106.
Shaddix, Christopher R., & Williams, Timothy C. The effect of oxygen enrichment on soot formation and thermal radiation in turbulent, non-premixed methane flames. United States. https://doi.org/10.1016/j.proci.2016.06.106
Shaddix, Christopher R., and Williams, Timothy C. Tue . "The effect of oxygen enrichment on soot formation and thermal radiation in turbulent, non-premixed methane flames". United States. https://doi.org/10.1016/j.proci.2016.06.106. https://www.osti.gov/servlets/purl/1326771.
@article{osti_1326771,
title = {The effect of oxygen enrichment on soot formation and thermal radiation in turbulent, non-premixed methane flames},
author = {Shaddix, Christopher R. and Williams, Timothy C.},
abstractNote = {Non-premixed oxy-fuel combustion of natural gas is used in industrial applications where high-intensity heat is required, such as glass manufacturing and metal forging and shaping. In these applications, the high flame temperatures achieved by oxy-fuel combustion increase radiative heat transfer to the surfaces of interest and soot formation within the flame is desired for further augmentation of radiation. However, the high cost of cryogenic air separation has limited the penetration of oxy-fuel combustion technologies. New approaches to air separation are being developed that may reduce oxygen production costs, but only for intermediate levels of oxygen enrichment of air. To determine the influence of oxygen enrichment on soot formation and radiation, we developed a non-premixed coannular burner in which oxygen concentrations and oxidizer flow rates can be independently varied, to distinguish the effects of turbulent mixing intensity from oxygen enrichment on soot formation and flame radiation. Local radiation intensities, soot concentrations, and soot temperatures have been measured using a thin-film thermopile, planar laser-induced incandescence (LII), and two-color imaging pyrometry, respectively. The measurements show that soot formation increases as the oxygen concentration decreases from 100% to 50%, helping to moderate a decrease in overall flame radiation. An increase in turbulence intensity has a marked effect on flame height, soot formation and thermal radiation, leading to decreases in all of these. The soot temperature decreases with a decrease in the oxygen concentration and increases with an increase in turbulent mixing intensity. Altogether, the results suggest that properly designed oxygen-enriched burners that enhance soot formation for intermediate levels of oxygen purity may be able to achieve thermal radiation intensities as high as 85% of traditional oxy-fuel burners utilizing high-purity oxygen.},
doi = {10.1016/j.proci.2016.06.106},
journal = {Proceedings of the Combustion Institute},
number = 3,
volume = 36,
place = {United States},
year = {2016},
month = {7}
}

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Works referenced in this record:

A review of air separation technologies and their integration with energy conversion processes
journal, May 2001


Air separation and liquefaction: recent developments and prospects for the beginning of the new millennium
journal, January 2002


Air separation by pressure swing adsorption
journal, September 1990


Mixed ionic–electronic conducting (MIEC) ceramic-based membranes for oxygen separation
journal, July 2008


Current status of ceramic-based membranes for oxygen separation from air
journal, October 2010

  • Hashim, Salwa Meredith; Mohamed, Abdul Rahman; Bhatia, Subhash
  • Advances in Colloid and Interface Science, Vol. 160, Issue 1-2
  • DOI: 10.1016/j.cis.2010.07.007

Highly Porous and Stable Metal−Organic Frameworks: Structure Design and Sorption Properties
journal, February 2000

  • Eddaoudi, Mohamed; Li, Hailian; Yaghi, O. M.
  • Journal of the American Chemical Society, Vol. 122, Issue 7, p. 1391-1397
  • DOI: 10.1021/ja9933386

Enhanced O 2 Selectivity versus N 2 by Partial Metal Substitution in Cu-BTC
journal, March 2015

  • Sava Gallis, Dorina F.; Parkes, Marie V.; Greathouse, Jeffery A.
  • Chemistry of Materials, Vol. 27, Issue 6
  • DOI: 10.1021/cm5042293

Effect of Metal in M 3 (btc) 2 and M 2 (dobdc) MOFs for O 2 /N 2 Separations: A Combined Density Functional Theory and Experimental Study
journal, March 2015

  • Parkes, Marie V.; Sava Gallis, Dorina F.; Greathouse, Jeffery A.
  • The Journal of Physical Chemistry C, Vol. 119, Issue 12
  • DOI: 10.1021/jp511789g

Modelling nongrey gas-phase and soot radiation in luminous turbulent nonpremixed jet flames
journal, August 2005


Experimental investigation of the natural gas confined flames using the OEC
journal, March 2011

  • Bandeira Santos, Alex Álisson; Torres, Ednildo Andrade; de Paula Pereira, Pedro Afonso
  • Energy, Vol. 36, Issue 3
  • DOI: 10.1016/j.energy.2011.01.011

Oxygen-enhanced/natural gas flame radiation
journal, July 1997


A Study of the Influence of Oxygen Index on Soot, Radiation, and Emission Characteristics of Turbulent Jet Flames
journal, July 2002


Laser diagnostics and their interplay with computations to understand turbulent combustion
journal, January 2007


One-dimensional tomography: a comparison of Abel, onion-peeling, and filtered backprojection methods
journal, January 1992


Measurement of the dimensionless extinction coefficient of soot within laminar diffusion flames
journal, April 2007


Optical Properties in the Visible of Overfire Soot in Large Buoyant Turbulent Diffusion Flames
journal, February 2000

  • Krishnan, S. S.; Lin, K. -C.; Faeth, G. M.
  • Journal of Heat Transfer, Vol. 122, Issue 3
  • DOI: 10.1115/1.1288025

Wavelength and temperature dependences of the absorption and scattering cross sections of soot
journal, July 2010


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    Formation of Soot in Oxygen-Enriched Turbulent Propane Flames at the Technical Scale
    journal, January 2020

    • Edland, Rikard; Allgurén, Thomas; Normann, Fredrik
    • Energies, Vol. 13, Issue 1
    • DOI: 10.3390/en13010191