Influence of the Nanoaerosol Fraction Industrial Coal Dust on Methane-Air Combustion
S. V. Valiulin1,2, A. M. Baklanov1, S. N. Dubtsov1, V. V. Zamaschikov1,3, V. I. Klishin4,5, A. E. Kontorovich3,6, A. A. Korzhavin1, A. A. Onischuk1,2,3, D. Yu. Paleev4, P. A. Purtov1,3, L. V. Kuibida1,3
1Voevodsky Institute of Chemical Kinetics and Combustion, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
2Novosibirsk State Pedagogical University, Novosibirsk, 630126 Russia
3Novosibirsk State University, Novosibirsk, 630090 Russia
4Institute of Coal, Siberian Branch, Russian Academy of Sciences, Kemerovo, 650610 Russia
5Gorbachev Kuzbass State Technical University, Kemerovo, 650000 Russia
6A. A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
Keywords: угольный наноаэрозоль, горение метановоздушной смеси, образование аэрозоля в угольных шахтах, взрывы в угольных шахтах, coal nanoaerosol, methane-air combustion, aerosol formation in coal mines, explosions in coal mines
Abstract
The mechanism of formation of a nano-sized aerosol during mechanical destruction of coal from Kuzbass mines is studied. The concentration and size spectrum of aerosol particles in the mine tunnel with an operating shearer was measured using an aerosol spectrometer. It is found that 90% of the particles are less than 200 nm. In the nanometer range, there are two peaks corresponding to average diameters of 20 150 nm: the first of them is due to single particles, and the second to aggregates consisting of single particles. The formation of aerosol during mechanical crushing of coal in a continuous flow mill was studied. The spectrum and morphology of the particles produced in the laboratory mill are in qualitative agreement with those for the nanoaerosol formed in the mine. The effect of the coal aerosol on the combustion of gas mixtures was studied. Laboratory experiments have shown that the presence of nanoaerosol in a lean methane-air mixture significantly increases its explosiveness. This is manifested in an increase in the maximum pressure and a significant increase in the pressure rise rate during explosion. The study leads to the conclusion that the source of nanoaerosol is the organic components contained in coal and released into the gas phase during local heating of coal on the cutter teeth.
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