Study And Application Position Technology For Spontaneous Combustion Source In Coal Mine

Suffering from the synergy of heat storage and dissipation environment, the power and intensity of air leakage, and the oxygen distribution of the loose coal, there is hyperthermia of coal block in roadway deformation bands, up-and-down bands and area of crossing stress concentration. And then spontaneous combustion happens. It's hard to realize early warning due to concealment of early hyperthermia. This paper analyses affect of critical factors, including moisture, porosity etc, on spontaneous combustion temperature field,confirms loose coal gas percolation continuity equation, oxygen concentration field and temperature field model based on Darcy's law,Fick law, energy conservation equation and continuity equation, establishes coal block and goaf spontaneous combustion hyperthermia determination model and gives spontaneous combustion necessary and sufficient conditions based on coal oxidation theory. It simulates displacement rule of coal block and goaf spontaneous combustion internal temperature under the affect of external air velocity,wall temperature and other physical and chemical parameters with computational fluid dynamics (CFD), develops drilling temperature probing rods,measure the temperature and gradient in drill with drilling temperature probing rods and infrared thermal imager, determines and analyzes gas composition in 1226 goaf with bundle tube monitoring system. And research on the way to locate fire with them and goaf temperature change regularity during mining and in the nearby stopping line of working face with temperature sensor in 1019 working face. At last, it summarizes relevance among index gases, temperature field and related roadway physical parameters which has great significance on hidden fire location in goaf and coal block and catastrophe development control.