Pyrolysis of Lignite under the Laser Radiation Exposure

The thermal decomposition of demineralized brown coal under the action of pulsed laser radiation in the energy density range from 1.15 to 1.95 J/cm
²
was studied. The following gaseous pyrolysis products were recorded by mass spectrometry: H
₂
., CH
₄
., H
₂
O., CO., CO
₂
. It is shown that in the studied range of laser radiation energy density, the concentration of carbon monoxide and hydrogen in the composition of gaseous pyrolysis products increases with increasing energy density in a pulse, and the concentration of carbon dioxide and water vapor, on the contrary, decreases. The methane concentration values are close to constant. The yield of combustible components from demineralized coal is much lower than from non-demineralized coal.