Abstract
The luminescence spectra of coal fractions with dimensions d ≤ 63 μm were studied directly during the action of neodymium laser pulses (τi = 120 μs). Depending on the radiation energy density H, the luminescence spectra have a different character. The glow at minimum values of the laser pulse energy density \(H_{{{\text{cr}}}}^{{(1)}}\) is associated with the ignition of fine coal particulates (~1 μm) present in the fractions, and with the ignition of reactive microprotrusions on the surface of larger coal particles. The luminescence spectra at this stage are of a non-thermal nature and are associated with the radiation of volatile molecules in the gas phase and their oxidation products. With an increase in the laser pulse energy density H, a thermal glow of the surface of larger coal particles is observed, which is described by the Planck formula at T = 3100 K. When H = \(H_{{{\text{cr}}}}^{{(2)}}\) is reached, the surface of the coal particles ignites during the action of the laser pulse. Contributions to the spectra are the glow of the surface of coal particles, emitted carbon particles, and the glow associated with the emission of excited molecules H2, H2O, and CO2. With an increase in H > \(H_{{{\text{cr}}}}^{{(2)}}\), the processes leading to the glow of coal particles during a laser pulse are similar to those described above for \(H_{{{\text{cr}}}}^{{(2)}}\), but the glow intensity increases.
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REFERENCES
J. C. Chen, M. Taniguchi, K. Narato, and K. Ito, Combust. Flame 97, 107 (1994). https://doi.org/10.1016/0010-2180(94)90119-8
A. F. Glova, A. Ju. Lysikov, and M. M. Zverev, Quantum Electron. 39, 537 (2009). https://doi.org/10.1070/QE2009v039n06ABEH013906
M. Taniguchi, H. Kobayashi, K. Kiyama, and Y. Shimogori, Fuel 88, 1478 (2009). https://doi.org/10.1016/j.fuel.2009.02.009
V. M. Boiko, P. Volan’skii, and V. F. Klimkin, Combust. Explos. Shock Waves 17, 545 (1981). https://doi.org/10.1007/BF00798143
T. X. Phuoc, M. P. Mathur, and J. M. Ekmann, Combust. Flame 93, 19 (1993). https://doi.org/10.1016/0010-2180(93)90081-D
V. A. Pogodaev, Combust. Explos. Shock Waves 20, 46 (1984).
A. V. Kuzikovskii and V. A. Pogodaev, Combust. Explos. Shock. Waves 13, 666 (1977). https://doi.org/10.1007/BF00742231
T. X. Phuoc, M. P. Mathur, and J. M. Ekmann, Combust. Flame 94, 349 (1993). https://doi.org/10.1016/0010-2180(93)90119-Ng
B. P. Aduev, D. R. Nurmukhametov, N. V. Nelyubina, R. Y. Kovalev, and Z. R. Ismagilov, Russ. J. Phys. Chem. B 10, 963 (2016).
B. P. Aduev, D. R. Nurmukhametov, R. Y. Kovalev, Ya. V. Kraft, and Z. R. Ismagilov, Opt. Spectrosc. 125, 293 (2018).
B. P. Aduev, D. R. Nurmukhametov, Ya. V. Kraft, and Z. R. Ismagilov, Opt. Spectrosc. 128, 429 (2020).
L. V. Levshin and A. M. Saletskii, Luminescence and Its Measurements (Mosk. Gos. Univ., Moscow, 1989) [in Russian].
Q. Yang and Z. Peng, Int. J. Hydrogen Energy 35, 4715 (2010). https://doi.org/10.1016/j.ijhydene.2009.12.045
A. Gaydon, Spectroscopy and Combustion Theory (Springer, New York, 1942).
R. Pearse and A. Gaydon, The Identification of Molecular Spectra (Springer, Netherlands, 1976).
ACKNOWLEDGMENTS
The authors are grateful to A.N. Zaostrovskii for the provided coal samples, N.I. Fedorova for technical analysis of samples, and S.A. Sozinov for the microphotography.
Funding
The work was financially supported by the Russian Foundation for Basic Research (project no. 20-43-420019р_а) and was carried out within the framework of the State Assignments of the Institute of Coal Chemistry and Material Science of Siberian Branch of the Russian Academy of Sciences, of Federal Research Center of Coal and Coal Chemistry of Siberian Branch of the Russian Academy of Sciences (project AAAA-A17-117041910150-2, head B.P. Aduev) on the equipment of the Center for Collective Use of the Federal Research Center of Coal and Coal Chemistry of Siberian Branch of the Russian Academy of Sciences.
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Translated by V. Selikhanovich
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Aduev, B.P., Nurmukhametov, D.R., Kraft, Y.V. et al. Glow Spectral Characteristics of the Hard Coal Particles Surface during the Action of Laser Pulses in the Free Generation Mode. Opt. Spectrosc. 128, 2008–2014 (2020). https://doi.org/10.1134/S0030400X20120838
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DOI: https://doi.org/10.1134/S0030400X20120838