Laser ignition of coal-petn mixtures composition

摘要

Laser ignition (λ = 1064 nm, 120 μs) of the fraction of lignite particles ≤0.1 mm in diametre, as well as lignite-petn mixtures, was studied. It was found that with an increase in the petn inclusions in the range from 0 to 50 wt. %, the ignition threshold of the mixtures decreases monotonically from 2.9 to 2 J/cmSUP2/SUP, and the combustion temperature increases from 1800°K to 2100°K. At an inclusions concentration of 50 to 90 wt. %, the ignition threshold is weakly dependent on the energy density of the laser radiation. With an increase in the inclusions concentration from 90 to 99.5%, a sharp increase in the ignition threshold is observed.