Research On The Spontaneous Combustion "Three Zone"Mining Of Fully Mechanized Caving Face

Mine coal fire as one of the five natural disasters,not only will cause a lot of waste of coal resources,but also pose a threat to the security and safety of miners producing mines.Mine fire, spontaneous combustion of coal Gobs proportion accounted greatly.Thus, through the study of the mined area to be divided "three zones",as well as distribution in different situations,either Gobs of coal spontaneous combustion provide predictive and preventive measures.In this paper, the data analysis stage, data sources tashan8102gas concentration inside the mine goaf through the face6f the beam tube monitoring system to measure the concentration of gas inside the mined area and the data using MATLAB processing, you can get a three-dimensional distribution of oxygen concentration Gob Gob plane diagram and oxygen concentration equivalent curve. ORIGIN use to fit the oxygen concentration of each measuring point, the equation can be fitted curve for each measuring point, by fitting equation can be solved oxygen concentration of18%,15%,11%,7%each measuring point position inside the mined area, and ultimately to determine distribution of "three zones"; numerical simulation phase, first of all, for the8102through GAMBIT modeling goaf using FLUENT computational fluid dynamics software to simulate the oxygen concentration in goaf distribution, in order to get a more accurate range of its division in the mined-out area20meters to set the model’s four-point lateral longitudinal intervals, analyzing the oxygen concentration of these points,to give the interior contours of oxygen concentration distribution, through the an oxygen concentration of18%,7%to determine the contours of the final divided range may be determined. The resulting data analysis and numerical analysis of the obtained results were compared with the simulation results are some differences between the two, but closer to the divided ranges and trends can explain the accuracy of the results. Then, in the adjustment face conditions for air volume, its internal oxygen concentration distribution simulation, and with no change in the distribution of oxygen concentration in the air volume before the comparison and analysis on changing the amount of wind conditions for, the scope of the "three-zone" affected. Finally, in the case of the mined area to continuously inject nitrogen, using8102face beam tube monitoring system to collect goaf gas injection internal nitrogen concentration data, the data processing using MATLAB, you can get a three-dimensional mining empty oxygen concentration distribution area and flat gob oxygen concentration equivalent curve. To fit the oxygen concentration of each measuring point by ORIGIN, can be fitted curve equation for each measuring point, by fitting equation can be solved oxygen concentration of18%,15%,11%,7%each measuring point position inside the mined area, and ultimately determine nitrogen injection after "three zones" distribution. Results under conditions of nitrogen injection, gob "three zones " in the cooling zone, greatly reduce the scope of the oxidation zone, so that left the mined coal spontaneous combustion zone is not easy.Through research, can provide a better measure of the mined-out area of fire prevention, and spontaneous combustion of coal mined-out area of prevention effect.