SOME ISSUES OF DETECTING THE DEVELOPMENT STAGES OF MINE FIRES

Abstract

Purpose. Consideration and analysis of the methodology for detecting fires occurring in coal mines in order to establish the main issues of temperature assessment and the stages of an extinguished fire. Methodology. The research methodology consists of analysing the methodology for detecting the stages of development and attenuation of endogenous and exogenous mine fires, as well as assessing their similarities and differences. Using the data obtained as a result of research, we consider the possible temperature in the source of a mine fire, its change in the process of burning and attenuation of the fire. A new approach to assessing the state of a fire is proposed in the form of a temperature-heat-conducting method for assessing its state and other solutions. Results. The main features of underground fire detection are the large length, branching of underground workings and the complexity of the ventilation system. Also, such physical parameters of the air jet are taken into account that are associated with heat and mass transfer (flow velocity, the magnitude of the temperature field, gas concentrations and the general composition of the gaseous medium) and not associated with heat and mass transfer (spectral characteristics, air density (or transparency), electromagnetic characteristics). Physical features are of the greatest interest from the point of view of detecting an underground fire. The most effective additional emergency criteria for early detection of an underground fire are the rate of increase in air temperature and the rate of increase in the concentration of carbon monoxide. The paper substantiates a method for assessing the state of a fire in a mine based on the dynamics of temperature increase in its source. After the write-off of the fire, reconnaissance of mine workings in an insulating fire area, control observations of the gas composition of the air and the absence of signs of spontaneous combustion of coal, the jumpers are dismantled and installation and restoration work is carried out according to a specially developed project. Scientific novelty. It has been established that the main stage of development of a mine fire can be most correctly established by the dynamics of temperature changes, the method of such an assessment is substantiated. Practical significance. The research results will be necessary to develop a method for establishing the main stage of development and attenuation of a mine fire.