Combustion of solid aerosol particles subjected to CO2-laser radiation

Kuzikovskii, A. V.; Pogodaev, V. A.

doi:10.1007/bf00742231

Cited by 12 publications

(3 citation statements)

References 2 publications

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“…The area of the laser spot on the sample was S = 0.03 cm 2 . Sample glow was collected with lens (8) and recorded with the help of a photoelectron multiplier Hamamatsu H10721-20 (9) and oscillograph LeCroy WaveJet WJ332A (10). The time of laser radiation exposure was governed with the help of pulse generator G5-56 (11).…”

Section: Samples and Experimental Proceduresmentioning

confidence: 99%

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Ignition of Low-Metamorphized Coal with Continuous Lasers at Wavelengths 450 nm and 808 nm

Aduev

Belokurov

Liskov

et al. 2022

Eurasian Chem. Tech. J.

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The paper presents the results of a comparative investigation into the kinetic and energy characteristics of the ignition of microparticles of low-metamorphized coal ranks (lignite coal and high volatile C bituminous coal) under the impact of laser radiation at the wavelengths λ = 450 nm and λ = 808 nm with an exposure time of 1 sec. Coal ignition is carried out only during irradiation. There is no transition to stationary combustion. The ignition delay time decreases monotonically with increasing radiation power density. It is established that the energy costs of ignition of the studied coal ranks may be made more economical by using laser radiation with a wavelength of λ = 450 nm. It is concluded from the results of measuring the energy characteristics of coal ignition that the absorption of radiation has a quantum nature. Two components contribute to the coal particles emission spectra measured at the initial stage of ignition: CO (CO2*) flame and thermal glow associated with emitted carbon particles heated to T>2000 K for both coal ranks. At subsequent stages, only the glow of heated carbon particles with the thermal spectrum at T~2000 K is observed in the spectra.

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Section: Samples and Experimental Proceduresmentioning

confidence: 99%

“…Pulverized coal ignition with laser radiation is a very promising method. At present, works aimed at the studies of kinetic and energy characteristics of pulverized coal ignition with the help of pulsed neodymium and continuous CO 2 -lasers are carried out [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Ignition of Low-Metamorphized Coal with Continuous Lasers at Wavelengths 450 nm and 808 nm

Aduev

Belokurov

Liskov

et al. 2022

Eurasian Chem. Tech. J.

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“…При исследовании начальных механизмов воспламенения углей в качестве источника зажигания может использоваться лазерное излучение. Имеется достаточно большое количество работ с использованием CO 2 -и неодимовых лазеров [1][2][3][4][5][6][7][8]. Основные выводы, которые следуют из этих работ, сводятся к тому, что в результате поглощения лазерного излучения происходит нагрев поверхности частиц углей, выход и воспламенение летучих веществ в газовой фазе и зажигание нелетучего остатка.…”

Section: Introductionunclassified

Спектральные Характеристики Свечения Поверхности Частиц Каменных Углей Во Время Воздействия Лазерных Импульсов В Режиме Свободной Генерации

Адуев¹,

Нурмухаметов²,

Крафт³

et al. 2020

Журнал Технической Физики

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In this work, we investigated the glow spectra of coal fractions with dimensions 63 μm directly during the action of neodymium laser pulses (120 μs). Depending on the radiation energy density H, the emission spectra have a different character. The glow at the minimum values of the laser pulse energy density Hcr (1) is associated with the ignition of small coal particles (~ 1 μm) present in the fractions and the ignition of reactive microprotrusions on the surface of the larger coal particles. The glow spectra at this stage are of a non-thermal nature and are associated with the emission of molecules of volatile substances in the gas phase and the products of their oxidation. With an increase in the laser pulse energy density H, a thermal glow of the surface of larger coal particles is observed, which is described by the Planck formula at T = 3100 K. When H = Hcr (2) is reached, the surface of the coal particles is ignited during the action of the laser pulse. Contributions to the spectra are the glow of the surface of coal particles, emitted carbon particles, and the glow associated with the emission of excited molecules H2, H2O, CO2. With an increase in H> Hcr (2), the processes leading to the glow of coal particles during a laser pulse are similar to those described above for Hcr (2), but the glow intensity increases

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