Special Features of the Release of Indicator Fire Gases at the Nitrogen Supply to the Foci of Coal Spontaneous Combustion


The most common method for monitoring the processes of spontaneous combustion of coal in the mines is the analysis of the composition of the mine atmosphere to detect gases released from coal when the temperature rises. Carbon monoxide and hydrogen are usually used as the main indicators. In recent years, nitrogen is widely used to prevent and extinguish the underground fires. It reduces the oxygen concentration in the fire area and can affect the indicator gases release. To study this effect, the samples of coal with a fraction of 1–3 mm, and the samples of coal dust with a particle size of 0.2–0.4 mm were used. Nitrogen with an admixture of oxygen was supplied to the heated samples. Studies showed that the carbon monoxide and hydrogen are released from the coal dust much more intensively than from the coal. Therefore, high concentrations of these indicator gases may point to the spontaneous combustion of the coal dust. As the proportion of oxygen in the mixture with nitrogen decreases, the release of carbon monoxide and hydrogen from the heated samples of coal and coal dust decreases. This can make it difficult to assess the state of spontaneous combustion foci in an inert environment. 

To determine the coal temperature when nitrogen with different oxygen content is supplied, the ratio of carbon monoxide and hydrogen concentrations can be used. In the coal dust it turns out to be the same as in the coal only at 3 % oxygen content. With an increase in the oxygen concentration, this ratio for the coal dust changes significantly. This fact can be used for the identification of fire foci.

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DOI: 10.24000/0409-2961-2022-4-47-52
Year: 2022
Issue num: April
Keywords : mine centers of spontaneous-combustion endogenous fire hydrogen nitrogen spontaneous combustion detection indicator fire gases control of the foci state inert gases carbon monoxide
  • Portola V.A.
    Dr. Sci. (Eng.), Prof., T.F. Gorbachev Kuzbass State Technical University, Kemerovo, Russian Federation
  • Bobrovnikova A.A.
    Cand. Sci. (Chem.), Head of the Department T.F. Gorbachev Kuzbass State Technical University, Kemerovo, Russia
  • Sin S.A.
    Research Associate T.F. Gorbachev Kuzbass State Technical University, Kemerovo, Russia
  • Igishev V.G.
    Dr. Sci. (Eng.), Prof. AO «NTs VostNII», Kemerovo, Russia