Effect of coal mine organic aerosol on the methane/air lower explosive limit

Autor: S. V. Valiulin, A. A. Onischuk, A. M. Baklanov, A. A. Bazhina, D. Yu. Paleev, V. V. Zamashchikov, A. A. Korzhavin, S. N. Dubtsov
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: International Journal of Coal Science & Technology, Vol 7, Iss 4, Pp 778-786 (2020)
Druh dokumentu: article
ISSN: 2095-8293
2198-7823
DOI: 10.1007/s40789-020-00313-4
Popis: Abstract Organic aerosol is formed in coal mines due to heat release and evaporation of organics from coal during the longwall operation. This frictional heating occurs when a metallic cutting bit strikes a rock. Thus formed organic aerosol can contribute significantly to the explosivity of methane/air atmosphere in coal mines. In this paper, the flammable limits for the methane–air mixtures with organic aerosol are determined. For this purpose, organic aerosol is synthesizes from the coal-tar pitch in a laboratory evaporation–nucleation flow chamber. Aerosol particles synthesized under laboratory conditions are aggregates consisting of small primary particles with the fractal-like dimension D f = 2.0 ± 0.1, which is close to D f = 2.1 ± 0.1 of coal mine aerosol. It is shown that the flammability of organic aerosol/methane mixture in air is in good agreement with the Le Chatelier additive principle. The lower ignition limit for the pure organic aerosol in air is 44 g/m3.
Databáze: Directory of Open Access Journals
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