Abstract:

Accurate division of spontaneous combustion in goaf of "three zones", to guide the on-site fire-fighting has important significance. According to the actual situation at the scene observed partial known parameters (flow, pressure and goaf size etc.), FLUENT software was used to simulate the blasting mining working face goaf of oxygen concentration field, the simulation results and field measured data (oxygen concentration) were compared and analyzed, and the simulation parameters are adjusted suitably, until the simulation results with the field measured data can be retrieved, correct simulation parameters (porosity, permeability and viscosity resistance etc.), eventually to simulate oxygen concentration field, velocity field, the distribution of the gas concentration and pressure distribution, through the double indicator method (upper air wind velocity 0.004m/s and lower oxygen concentration 8%) division of Gob Spontaneous Combustion "three belt", on the analysis of simulation results can be obtained by goaf spontaneous combustion with a maximum width of 58m, and the calculation of work safety advanced speed of 2.3m/d, for the prevention of spontaneous combustion of coal in goaf provides scientific basis.

Key words: ”Three Zones”of spontaneous combustion, double index, numerical simulation of FLUENT, gas distribution.Blasting mining face