This article is cited in 2 papers

Laser physics and laser optics

Spectral characteristics of the glow of coal flames during the exposure to laser pulses

B. P. Aduev, D. R. Nurmuhametov, Ya. V. Kraft, Z. R. Ismagilov

The Federal Research Center of Coal and Coal-Chemistry of Siberian Branch of the Russian Academy of Sciences, 650000 Kemerovo, Russia

Abstract: The results of measuring the characteristics of the glow of coal flames at the initial moments of ignition under the action of laser pulses of a neodymium laser (1064 nm, 120 $\mu$s) are presented. In microparticles of coal grades DG, G, Zh, and K, when the corresponding critical energy densities are exceeded during a laser pulse, the surface ignites and flame propagates at a speed of $V\approx$ 50 m/s. The emission spectra of flames are contributed by the emission of emitted hot coal particles, excited H$_2^*$ and H$_2$O$^*$ molecules, as well as the flame emission arising from the oxidation of carbon (CO$^*$) and carbon monoxide (CO$_2^*$) by atmospheric oxygen.

Keywords: coal, laser, ignition, flame, volatile substances, degree of coalification, coke residue.

Received: 30.05.2022
Revised: 30.05.2022
Accepted: 10.06.2022

DOI: 10.21883/OS.2022.08.52905.3750-22

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