Pyrolysis of Brown Coal under the Action of Frequency-Pulse Nanosecond Laser Radiation

In this work we studied the effect of pulsed nanosecond laser radiation (532 nm, 14 ns, 6 Hz, 0.2-0.6 J/cm2) on brown coal samples in an argon medium. H2, CH4, C2H2, CO and CO2 were found in the composition of gaseous products formed in the pyrolysis of coal samples. It is shown that with an increase in the laser radiation energy density, the volume fraction of acetylene in the composition of gaseous products of coal pyrolysis increases, while the volume fractions of methane and carbon dioxide, on the contrary, decrease. The volume fractions of hydrogen and carbon monoxide in the studied range of laser radiation energy density are close to constant. The volume of combustible gases formed per unit mass of the reacted coal sample increases with increasing laser radiation energy density in the range of 0.2-0.5 J/cm2. With a further increase in the energy density of laser radiation, the volume of combustible gases formed per unit mass of the reacted coal sample remains practically unchanged.