LASER PYROLYSIS OF HIGH-GRADE METAMORPHIC COALS

Gaseous products formed in the pyrolysis of samples composed of the tableted K (coking) and A (anthracite) coal microparticles under the action of pulse-periodic laser radiation (with the parameters: 532 nm, 10 ns, 6 Hz, 0.2-0.6 J/cm2) in the argon environment have been studied. It is shown that the concentration of gaseous products increases exponentially with an increase in the laser radiation energy density. Exceeding the critical radiation energy density values (Hcr = 0.18 and 0.26 J/cm2 for K and A coal ranks, respectively) leads to ablation of coal samples.