Abstract
The object of this paper is to study the specificity of the dynamics of carbon monoxide in mining to determine the location of the source of coal self-heating or spontaneous combustion. The Fire Dynamics Simulator software package was used to model the gas hazard of coal mine workings. Given the typical details for the western coal basin of Donbas geo metric dimensions of workings, properties of coal, etc., a model of a fragment of emergency mining of a coal mine was created, which allows for the display of geometric and physical similarity to processes in actual mine workings. The results of the simulation for the studied scenarios with different air supply systems related to the detection and location of sources of self-heating or spontaneous combustion in the coal mine workings were obtained and analysed. It was established that low-density fire gases are concentrated in the vault of the workings, where they slowly dissolve in the air, with the dissolution process being linear. It was revealed that air velocity up to 0.67 to 0.7 m/s contributes to the formation of fire gas flows, which move towards the ventilation flow, almost without mixing, which is referred to as bifurcation. Numerical parameters of fire gas dynamics in near-real conditions were established, which can become a basis for the detection and location of sources of endogenous thermodynamic processes in mine workings.
Highlights
Underground fires in coal mines significantly complicate mining operations, lead to the loss of mineral reserves and expensive coal mining equipment prepared for extraction
With the help of the Fire Dynamics Simulator (FDS) program, it is possible to consider the dynamics of gas distribution, namely carbon monoxide (CO), along the working over a period for each of the proposed scenarios
To study the dynamics of the movement of carbon monoxide in mining workings to determine the location of the source of self-heating or spontaneous combustion of coal was simulated using the software package Fire Dynamics Simulator
Summary
Underground fires in coal mines significantly complicate mining operations, lead to the loss of mineral reserves and expensive coal mining equipment prepared for extraction. They cause enormous economic damage associated with fire extinguishing. Extinguishing endogenous fires caused by the spontaneous combustion of coal in hard-to-reach places is especially complicated. The economic damage from endogenous fires during this period ranged from 2.7. A significant proportion of endogenous fires, from 33% to 70%, occur annually in the worked-out areas, which makes it difficult to detect them at an early stage of development, and locate the foci coordinates (CHPMMRS, 2016). Due to the lack of reliable data on the state and location of the fire, the efficiency of supplying fire-extinguishing substances is sharply reduced, and insulation methods or insulation-based combined methods are used for extinguishing
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