Stage Characteristics Of Coal Spontaneous Combustion And Zone Variation Law Of Goaf Spontaneous Combustion

In order to study mechanism of phase variation of the coal spontaneous combustion, researched the process of coal spontaneous combustion, explored the basic conditions of the coal seam spontaneous combustion, coal combustion process and geological features of the shallow Tibet seam by theoretical analysis. By the experimental of temperature programmed、adiabatic oxidation、and the TG-FTIR to comparison and study the variation of the indicator gas in the low-temperature phase of the different coals、TGA variation of coal spontaneous combustion tendency and high-temperature phase of the coal combustion process、characteristics of disasters gas characteristics of changes. So study of coal spontaneous combustion reactions and structural properties of the various stages based on the different experiments, and provide data support such as heat source、oxygen source for numerical simulation of Gob "three zones". By the combination of Xing Tao coal mining work surface overlying rock fissures simulation, analysis the permeability coefficient of variation of goaf area (fractured zone, the caving zone, the deformation zone), to reveal the main air leakage characteristics of the mine. According to goaf seam tendency (horizontal) direction, established a mathematical model of permeability coefficient of variation, provide data support for the goaf penetration field simulation. Based on the theoretical analysis in papers, established coal spontaneous combustion mathematical model of goaf, and combined with Visual C++development visualization goaf fire localization numerical simulation software V1.0, by the experimental basis data, simulation the different circumstances changes of spontaneous combustion region, and found a comprehensive prevention and treatment programs for the coal spontaneous combustion. The results show that:by the elemental analysis of coal can be predicted coal various stages of feature points and their gas concentration, provide a reliable decision-making for fire prevention of the goaf by numerical Simulation, and provide the management theory and technical support for the goaf’s prediction, prevention, forecasting.