Ignition of Coals with Continuous-Wave Lasers at Wavelengths of 450 and 808 nm

Author:

Aduev B. P.1,Belokurov G. M.1,Liskov I. Yu.1,Ismagilov Z. R.1

Affiliation:

1. Federal Research Center for Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences

Abstract

The kinetic and energy characteristics of the ignition of microparticle powders of coals of G (gas), Zh (fat), and K (coking) grades with a bulk density of 0.4 g/cm3 under the action of continuous-wave laser radiation at wavelengths λ = 450 and 808 nm with an exposure time of 1 s were measured. Coals were ignited only under irradiation, and the effect of flame propagation was absent. Ignition delay times were measured as a function of the radiation power density, and the critical values of the coal ignition energy density were determined. Energy consumption for the ignition of coals with radiation at λ = 808 nm was greater than that at λ = 450 nm for all grades of coals. It was established that the absorption of laser radiation by coal samples had a quantum character.

Publisher

The Russian Academy of Sciences

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