The Influence of Mineral Inclusions on the Laser Ignition Characteristics of Grade 2B Coal
B. P. Aduev, A. Yu. Mitrofanov, N. V. Nelyubina
Federal Research Center of Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences, Kemerovo, Russia
Keywords: laser, coal, laser ignition, combustion, glow dynamics
Abstract
The effect of potassium, calcium, magnesium, and iron chloride inclusions on the critical energy density of laser radiation sufficient for igniting pre-demineralized grade 2B brown coal using millisecond laser pulses with a wavelength of 1070 nm and an intensity in the range of 6.4-52 kW/cm² was studied. For minimum radiation intensities, additional calcium and magnesium concentrations of 5-7% increase the critical ignition energy density by 2-4 times. Potassium increases the critical energy density by less than 20%, while iron reduces it by approximately 2 times, with a tendency to saturate as the inclusion concentration increases to 7%. The effect of the inclusions used decreases with increasing radiation intensity and virtually ceases at a radiation intensity of 52 kW/cm².
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