CATALYTIC EFFECT OF THE MINERAL PART OF BROWN COAL ON THE COMBUSTION OF COAL MICROPARTICLES UNDER THE INFLUENCE OF LASER RADIATION

The effect of mineral components of brown coal on the efficiency of coal microparticle combustion under pulsed periodic exposure to laser radiation (1064 nm, 120 μs, 3 Hz) has been studied. The experimental samples were pressed tablets with a density of 1 g/cm3. Under microparticle irradiation with the same doses, the burnt mass is larger in samples with higher ash content, which indicates the catalytic effect of the mineral part of coal on burnout rate. The morphology of the surface and transverse chips of the samples after irradiation was studied by scanning electron microscopy. It has been found that the fused drops of minerals are observed on the surface of high-ash samples, and the channels of burnt organic part are observed on the transverse chips, along with the formation of calcium oxide phase.