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Abstract <p>This paper presents the results of pyrolysis of pelletized microparticles (1 g/cm<sup>3</sup>) of brown (B), long-flame gas (LG), gas (G), fat (F), and coking (C) coals in argon upon exposure to laser pulses (1064 nm, 12 ns, 6 Hz, 0.2–0.5 J/cm<sup>2</sup>). During exposure to laser pulses, the following nonlinear processes occur: (1) explosive ablation of the samples with the ejection of 10–60 μm microparticles at a radiation energy density of 0.1–0.2 J/cm<sup>2</sup>; (2) optical breakdown at microprotrusions on the surface of coal particles, evaporation of microprotrusions, and deposition of a thin film of amorphous carbon on the reactor walls; (3) initiation of thermochemical reactions in breakdown channels, resulting in the release of gaseous products with concentrations increasing nonlinearly with an increase in the laser pulse energy density. Molecular gases of H<sub>2</sub>, CH<sub>4</sub>, C<sub>2</sub>H<sub>2</sub>, CO, and CO<sub>2</sub> were detected. The dependences of the composition of gaseous coal pyrolysis products on their technical and genetic characteristics were established.</p>

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Pyrolysis of Coal Microparticles upon Exposure to Nanosecond Laser Pulses

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • B. P. Aduev,
  • Ya. V. Kraft,
  • V. D. Volkov,
  • N. V. Nelyubina

摘要

Abstract

This paper presents the results of pyrolysis of pelletized microparticles (1 g/cm3) of brown (B), long-flame gas (LG), gas (G), fat (F), and coking (C) coals in argon upon exposure to laser pulses (1064 nm, 12 ns, 6 Hz, 0.2–0.5 J/cm2). During exposure to laser pulses, the following nonlinear processes occur: (1) explosive ablation of the samples with the ejection of 10–60 μm microparticles at a radiation energy density of 0.1–0.2 J/cm2; (2) optical breakdown at microprotrusions on the surface of coal particles, evaporation of microprotrusions, and deposition of a thin film of amorphous carbon on the reactor walls; (3) initiation of thermochemical reactions in breakdown channels, resulting in the release of gaseous products with concentrations increasing nonlinearly with an increase in the laser pulse energy density. Molecular gases of H2, CH4, C2H2, CO, and CO2 were detected. The dependences of the composition of gaseous coal pyrolysis products on their technical and genetic characteristics were established.