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Ignition of Coals by Laser Pulses in the Free-Running Mode

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Abstract

The ignition thresholds and kinetic characteristics of the glow of flames under the action of nanosecond laser pulses (τi = 14 ns) of a YAG:Nd3+ laser (λ = 1064 nm) on coals of DG (long-flame gas), G (gas), Zh (fat), and K (coking) grades from the Kuznetsk Basin were measured. The stages associated with the evaporation of microprotrusions on the surface of particles and the development of an electron avalanche were distinguished. The threshold \(H_{{{\text{cr}}}}^{{(1)}}\) did not depend on the coal grade. The glow amplitude was a nonlinear function of H, and the kinetics of glowing contained two components with τ1 ~ 20 ns and τ2 ~ 1 μs. When the energy density \(H_{{{\text{cr}}}}^{{(2)}}\) was reached, glow in a microsecond time interval was observed due to the ignition of the coke residue. The ignition threshold \(H_{{{\text{cr}}}}^{{(2)}}\) decreased with an increase in the degree of coalification and a decrease in the volatile matter content.

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ACKNOWLEDGMENTS

We are grateful to A.N. Zaostrovskii for the provided coal samples and to N.I. Fedorova for performing the proximate analysis of the samples.

Funding

This work was carried out within the framework of a state contract at the Federal Research Center for Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences (project no. AAAA-A17-117041910150-2) using the equipment of the Center for Collective Use of the Federal Research Center for Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences.

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Authors and Affiliations

  1. Federal Research Center for Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences, 650000, Kemerovo, Russia

    B. P. Aduev, D. R. Nurmukhametov, G. M. Belokurov, Ya. V. Kraft & Z. R. Ismagilov

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  1. B. P. Aduev
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  2. D. R. Nurmukhametov
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  3. G. M. Belokurov
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  4. Ya. V. Kraft
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  5. Z. R. Ismagilov
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Correspondence to B. P. Aduev.

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Translated by V. Makhlyarchuk

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Aduev, B.P., Nurmukhametov, D.R., Belokurov, G.M. et al. Ignition of Coals by Laser Pulses in the Free-Running Mode. Solid Fuel Chem. 55, 194–199 (2021). https://doi.org/10.3103/S0361521921030022

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  • DOI: https://doi.org/10.3103/S0361521921030022

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