Three-dimensional Numerical Simulation Research On Correlation Of Gas And Spontaneous Combustion Disaster In Goaf

The goaf oxygen consumption rate, goaf air transport rule, rule and rule of goaf caving goaf gas emission, which were obtained from Daxing mine closed oxygen consumption heating experiment were combined. We applied the FLUENT software on the N2-706 face of Daxing Coal Mine Goaf on Numerical Simulation of air flow field simulation. We made some improvements on the hulking coefficient formula goaf caving in 3D space distribution in the simulation. The return of the quantitative relation was given by the simulation of strength condition of 3D mining width change rule, oxidation and spontaneous combustion zone width is negative exponential or Hyperbolic Attenuation along with the increase of gob gas emission intensity, in spontaneous combustion oxidation zone of different gas emission. Thus can predict such as sudden igneous rock or fault in the process of coal mining goaf gas emission caused by the special geological conditions such as changes in the goaf spontaneous combustion caused by the change of oxidation zone width. Simulation studied on the distribution of gob gas and oxygen concentrations in the overhead mining and inclined mining conditions, and drew a conclusion that when inclined mining spontaneous combustion oxidation zone width will be shortened, overhead mining spontaneous combustion belt width will increase, is not conducive to the spontaneous combustion prevention. By further simulation, high gas extraction at the same time of overhead mining],can make the goaf spontaneous combustion oxidation zone width narrow down, the oxygen concentration in the deep down,and reduce the danger of spontaneous combustion in deep space area, but it has increased the oxygen concentration in shallow goaf. Research has enriched the goaf gas and spontaneous combustion hazard of relevance theory.