Authors: Ya.V. Kraft, D.R. Nurmukhametov, B.P. Aduev, Z.R. Ismagilov

Title of the article: Pyrolysis of Kaichak lignite under the laser radiation exposure

Year: 2019, Issue: 3, Pages: 5-15

Branch of knowledge: 05.17.07 Chemical technology of fuel and high-energy substances

Index UDK: 66.092-977

DOI: 10.26730/1999-4125-2019-3-5-15

Abstract: The study of thermal decomposition of Kaichak lignite under the pulsed laser radiation exposure in the energy density range from 1.15 to 1.95 J/cm² was performed. The following pyrolysis gases were recorded by mass spectrometry method: H₂, CH₄, H₂O, CO, CO₂. The release of compounds with a molecular weight of more than 60 amu not found in products. It is shown that in the studied range of the laser radiation energy density, the H₂ concentration in the composition of the gaseous pyrolysis products increases with increasing exposure energy, and the CO₂ concentration, on the contrary, decreases. Concentrations of CO and CH₄ remain constant. The formation path of the pyrolysis registered products are proposed. The combustible gases yield per unit mass of the reacted sample increases linearly with increasing radiation energy density and reaches a value of 1.2·10³ cm³/g (1.2 m³/kg). The sum of combustible components in the mixture of gaseous pyrolysis products is 93%. With an increase in the laser radiation energy density, the mass loss of the sample increases linearly. The linear increase in mass loss indicates that the shielding effect of the sample surface by pyrolysis products is weak in the radiation energy density 1.15-1.95 J/cm².

Key words: coal laser pyrolysis laser mass spectrometry

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