Pyrolysis of brown coal microparticles under the action of nanosecond first-harmonic pulses from a neodymium laser

B. P. Aduev, V. D. Volkov

Institute of Coal Chemistry and Chemical Materials Science, Federal Research Center of Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences, 650000, Kemerovo, Russia

Abstract: We report the results of a study of pyrolysis of pelletized coal grade 2B samples in argon under the action of laser pulses (1064 nm, 14 ns, 6 Hz, 0.2–0.5 J/cm²). The result of laser irradiation of coal samples is their ablation and the formation of H₂, CH₄, CO, CO₂, and C₂H₂ gaseous products. The dependence of the yield of the resulting gaseous products on the energy density of laser pulses is described within the framework of a model of a chain mechanism for the development of laser-initiated thermochemical reactions. The ablated mass of samples increases linearly with increasing radiation energy density when the threshold value is exceeded, H > 0.2 J/cm².

Keywords: pulsed laser, coal, pyrolysis, ablation, gaseous products, chain reactions.

The work was performed within the framework of the state assignment of the Institute of Coal Chemistry and Chemical Materials Science of the Federal Research Center of Coal and Coal Chemistry of the Siberian Branch of the Russian Academy of Sciences (project no. 121031500513-4) on the equipment of the Shared Facility Center of the Federal Research Center of Coal and Coal Chemistry of the Siberian Branch of the Russian Academy of Sciences.

Received: 12.10.2023
Revised: 16.11.2023
Accepted: 16.11.2023