Analysis of quantitative and qualitative parameters of gas mixture in thermal processes of mine medium

Abstract The article examines the problem of the occurrence and spread of fires in mines caused by the increased emission of methane and coal dust. The method of mining space isolation with the help of fire-prevention stopping, reducing the oxygen concentration and creating an inert medium, was studied. It has been experimentally established that thermal action on coal without air access causes the formation of combustible gases such as methane, carbon monoxide, hydrogen and unsaturated hydrocarbons. The peculiarities of the formation of a multicomponent gas mixture in the temperature range from 400 to 900°C were determined. High temperature causes a gas phase yield rise, which leads to an increase in its heat of combustion according to a quadratic dependence. It was found that the methane yield increases up to 600°C, and then its decrease in the gas mixture is observed due to decomposition into hydrogen and atomic carbon at temperatures above 700°C.High values of combustion heat of gases are determined by methane at temperatures up to 800°C, after which the influence of hydrogen rises with high temperatures. The obtained data of the gas mixtures combustion heat make it possible to establish the qualitative and quantitative parameters of the thermal process occurring in the isolated mining space. This can be used to calculate the heat balance of the mining medium and to simulate the thermodynamic processes occurring during mining fires.