Spectral-Kinetic Characteristics of Laser Ignition of Pulverized Brown Coal


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In this study, we measured the spectral-kinetic characteristics of ignition of dustlike (pulverized) coal particles with a particle size of ≤100 μm using an yttrium-aluminum garnet laser with an admixture of neodymium operating in the free-running mode (120 μs). We discovered three stages of the process, each of which has a threshold character. During the laser pulse in the energy density range of 0.3–1.5 J/cm2, a rapid heating of the sample surface to 3000 K occurs due to the absorption of laser energy and initiation of a chemical reaction in the coal particles. In the energy density range of 1.6–2.1 J/cm2, the yield and ignition of volatile matter above the sample surface are observed in the time interval of 0.5–2 ms. In the emission spectra of the flame, we are able to distinguish bands associated with the combustion of volatile matter including the CO flame and the emission of excited H2O and H2 molecules. At H > 2 J/cm2, ignition and burning of the coke residue takes place in a time interval of 10–100 ms. Its emission spectrum corresponds to the emission spectrum of a black body at 1800 K.

作者简介

B. Aduev

Federal Research Center of Coal and Coal Chemistry

编辑信件的主要联系方式.
Email: lesinko-iuxm@yandex.ru
俄罗斯联邦, Kemerovo, 650000

D. Nurmukhametov

Federal Research Center of Coal and Coal Chemistry

Email: lesinko-iuxm@yandex.ru
俄罗斯联邦, Kemerovo, 650000

R. Kovalev

Federal Research Center of Coal and Coal Chemistry

Email: lesinko-iuxm@yandex.ru
俄罗斯联邦, Kemerovo, 650000

Ya. Kraft

Federal Research Center of Coal and Coal Chemistry

Email: lesinko-iuxm@yandex.ru
俄罗斯联邦, Kemerovo, 650000

A. Zaostrovskii

Federal Research Center of Coal and Coal Chemistry

Email: lesinko-iuxm@yandex.ru
俄罗斯联邦, Kemerovo, 650000

A. Gudilin

Prokhorov Institute for General Physics

Email: lesinko-iuxm@yandex.ru
俄罗斯联邦, Moscow, 119991

Z. Ismagilov

Federal Research Center of Coal and Coal Chemistry

Email: lesinko-iuxm@yandex.ru
俄罗斯联邦, Kemerovo, 650000

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