Experimental Study of Soot Volume Fraction Applied in Laminar Diffusion Flames

N. R. Caetano, F. M. Pereira, H. A. Vielmo, F. T. van der Lann

Federal University of Rio Grande do Sul, DEMEC-UFRGS, Porto Alegre, Brazil.

DOI: 10.4236/mme.2013.34019                

Abstract

The soot emission has been the focus of many studies due to applications in industry and the prejudicial effects caused to the environment. The presence of soot is important to the heat transfer in boilers and combustion chambers, contributing significantly to efficiency increases. In controversy, the inhaled soot may cause respiratory system damage and even cancer. Another important point is the contribution to the greenhouse effect. Therefore, the aim of this work is to analyse the soot emission in laminar diffusion flames produced from commercial fuels stabilized on a burner representative of industrial applications. Methane, vehicular natural gas and liquid petroleum gas are considered as fuels. An experimental setup was constructed to implement the technique of laser light extinction and laser-induced incandescence. These non-intrusive techniques provide instant information, in real time, about soot volume fraction. The measurements were calibrated and validated using methods and results of studies available in the literature, and also the uncertainty is analysed and suitably minimized. The results will contribute to the database for projects of combustion systems optimization, aiming to increase the efficiency and soot emissions control.

Keywords

Soot Emissions; Laminar Diffusion Flames; Commercial Fuels

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	R. T. Wainner and J. M. Seitzman, “Soot Diagnostics using LII in Flames and Exhaust Flows,” American Institute of Aeronautics and Astronautics, 1999.
[2]	P. O. Witze, S. A. Shimpi, R. P. Durrett and L. A. Farrell, “Time-Resolved Laser-Induced Incandescence Measurements for the EPA Heavy-Duty Federal Test Procedure,” JSME International Journal, Series B: Fluids and Thermal Engineering, Vol. 48, No. 4, 2005, pp. 632-638.
[3]	E. Geraque, “Fuligem Corresponde Por Terco do Aquecimento Global,” Folha de Sao Paulo, 2009.
[4]	A. Boiarciuc, F. Foucher, B. Moreau, O. Pajot and C. Mounaim-Rousselle, “Simultaneous Spatial and Temporal Resolved Laser-Induced Incandescence to Study the Soot Particles Formation,” Ph.D. Thesis, University of Orléans, Orléans, 2004.
[5]	L. G. Barreta and M. E. Sbampato, “Imaging of Laser-Induced Fluorescence in an Ethanol Atmospheric Flame,” 30th Encontro Nacional de Física da Matéria Condensada, 2007.
[6]	A. C. Eckbreth, “Effects of Laser-Modulated Particulate Incandescence on Raman Scattering Diagnostics,” Journal of Applied Physics, Vol. 48, No. 11, 1977 pp. 44734483. http://dx.doi.org/10.1063/1.323458
[7]	L. A. Melton, “Soot Diagnostics Based on Laser Heating,” Applied Optics, Vol. 23, No. 13, 1984, p. 2201. http://dx.doi.org/10.1364/AO.23.002201
[8]	R. L. Vander Wal and K. J. Weiland, “Laser-Induced Incandescence: Development and Characterization towards a Measurement of Soot-Volume Fraction,” Applied Physics, Vol. 59, No. 4, 1994, pp. 445-452.
[9]	R. L. Vander Wal, T. M. Ticich and B. Stephens, “Can Soot Primary Particle Size Be Determined Using LaserInduced Incandescence?” Combustion and Flame, Vol. 116, No. 1-2, 1999, pp. 291-296. http://dx.doi.org/10.1016/S0010-2180(98)00040-6
[10]	M. Y. Choi, G. W. Mulholland, A. Hamins and T. Kashiwagi, “Comparison of the Soot Volume Fraction using Gravimetric and Light Extinction Techniques,” Combustion and Flame, Vol. 102, No. 1-2, 1995, pp. 161-169. http://dx.doi.org/10.1016/0010-2180(94)00282-W
[11]	C. Shaddix, “Laser-Induced Incandescence Measurements of Soot Production in Steady and Flickering Methane, Propane, and Ethylene Diffusion Flames,” Combustion and Flame, Vol. 107, No. 4, 1996, pp. 418-452. http://dx.doi.org/10.1016/S0010-2180(96)00107-1
[12]	S. P. Burke and T. E. W. Schumann, “Diffusion Flames,” Combustion Symposium, Vol. 20, 1928, pp. 998-1004.
[13]	T. C. Willians, C. R. Shaddix, K. A. Jensen and J. M. SuoAnttila, “Measurement of the Dimensionless Extinction Coefficient of Soot within Laminar Diffusion Flames,” International Journal of Heat and Mass Transfer, Vol. 50, No. 7-8, 2007, pp. 1616-1630. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2006.08.024