STUDY OF THE DYNAMICS OF DISTRIBUTION OF INDICATOR GASES IN COAL MINES

Abstract

The purpose of the work is to study the dynamics of the distribution of indicator fire gases in the mining workings of a coal mine, as a basis for determining the location of the source of self-heating or self-ignition of coal. The Fire Dynamics Simulator software package was used to simulate the gasification of coal mine workings. Taking into account the geometric dimensions of workings, properties of coal, etc., typical for the western coal basin of Donbas, a model of a fragment of an emergency working of a coal mine was created, which allows to display the geometric and physical similarity to the processes in real mining workings. The simulation results for the studied scenarios with different air supply related to the detection and location of sources of self-heating or self-ignition in the workings of a coal mine were obtained and analysed. It has been established that fire gases, which have a low density, are concentrated in vault products, where they are slowly dissolved by air, the dissolution process is linear in nature. It was found that there is a possibility at an air speed of up to 0.67...0.7 m/s of the formation of streams of fire gases that move towards the ventilation stream almost without mixing with it – the phenomenon of bifurcation. Numerical parameters of the dynamics of fire gases in close to real conditions have been established, which can become the basis for identifying and locating the sources of endogenous thermodynamic processes in mining workings.