Ignition of anthracite microparticles by continuous laser radiation with wavelengths of 450 and 808 nm

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Abstract

The energy and spectral-kinetic characteristics of ignition of anthracite microparticle powders with a bulk density of 0.5 g/cm3 were measured when exposed to continuous laser radiation at wavelengths λ = 450 and 808 nm with an exposure time of 1 second. Ignition delay times were measured depending on the radiation power density and critical values of the ignition energy density of anthracite samples were determined. The energy cost of igniting anthracite for radiation with λ = 450 nm is less than for radiation with λ = 808 nm. In the emission spectra of anthracite resulting from the absorption of laser radiation, there is a glow associated with the release and ignition of volatile substances (flame CO, glow of excited molecules CO, C2 and H2O) and thermal glow associated mainly with the heated surface of the samples, as well as the flight of incandescent carbon particles.

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About the authors

B. P. Aduyev

FSBSC The Federal Research Center of Coal and Coal-Chemistry of Siberian Branch of the Russian Academy of Sciences (FRC CCC SB RAS)

Author for correspondence.
Email: lesinko-iuxm@yandex.ru
Russian Federation, Kemerovo, 650000

G. M. Belokurov

FSBSC The Federal Research Center of Coal and Coal-Chemistry of Siberian Branch of the Russian Academy of Sciences (FRC CCC SB RAS)

Email: lesinko-iuxm@yandex.ru
Russian Federation, Kemerovo, 650000

I. Y. Liskov

FSBSC The Federal Research Center of Coal and Coal-Chemistry of Siberian Branch of the Russian Academy of Sciences (FRC CCC SB RAS)

Email: lesinko-iuxm@yandex.ru
Russian Federation, Kemerovo, 650000

D. R. Nurmukhametov

FSBSC The Federal Research Center of Coal and Coal-Chemistry of Siberian Branch of the Russian Academy of Sciences (FRC CCC SB RAS)

Email: lesinko-iuxm@yandex.ru
Russian Federation, Kemerovo, 650000

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2. Fig. 1. Functional diagram of an experimental setup for measuring kinetic, energy, and spectral characteristics: 1 – glass neutral filters, 2 – transparent glass plate, 3 – photodiode, 4 – rotating mirror, 5 –lens, 6 – sample, 7 – lens, 8 – slit (0.1 × 3 mm), 9 – photomultiplier, 10 – oscilloscope, 11 – pulse generator, 12 – spectrometer, 13 – light guide, 14 – computer.

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3. Fig. 2. Typical oscillograms of the dependence of the luminescence intensity of anthracite samples on time: near-surface luminescence (a), flame luminescence at a distance of 1 mm from the sample surface (b) under laser exposure λ = 808 nm with a power density We = 130 W/cm2.

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4. Fig. 3. The dependence of the ignition delay time tz on the power density of laser radiation Wp absorbed by anthracite samples: 1 – λ = 808 nm; 2 – λ = 450 nm.

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5. Fig. 4. Dependences of the ignition probability P on the radiation power density Wp absorbed by anthracite samples (a); dependences of the ignition probability P on the number of absorbed photons n per unit time per unit area for anthracite samples: 1 – λ = 808 nm; 2 – λ = 450 nm (b).

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6. Fig. 5. The luminescence spectrum of the sample is integral in time in the range Δt = 0-100 ms from the beginning of laser irradiation (a); the luminescence spectrum of the sample is integral in time in the range Δt = 900-1000 ms from the beginning of laser irradiation (b).

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