The Distribution Of Oxygen Concentration In Huo Luo Wan Mine22210Fully Mechanized Face Mined Area And Engineering Application

Aiming Jolo Bay22210mechanized Caving Gob of the actual situation, the use ofnumerical simulation and beam tube monitoring data, Gob studied changes in three bands.The method of fluid mechanics and porous media, the use of two-dimensional modelFluent establish goaf oxygen concentration field distribution, the distribution of threespontaneous combustion comparative analysis with numerical simulation and actualmeasurements. Three conditions for spontaneous combustion with the actual measuredcomplex, some of the parameters that are set in the simulation results are more idealistic,although there are some deviations from the measured results, but generally speaking, the yare divided three-band range and change substantially the same, it can be concluded thatnumerical simulation is divided Gob three with a certain accuracy, as subsequent researchherein by reference. Depending on the application the oxygen concentration field divisionof spontaneous combustion three belts, studied the change in supply air volume,lower-corner sealing, on the corner next corner seal plugging, on the corner next cornerseal plugging and change the supply air flow, a non-interval-type nitrogen injection caseGob change under three-band range, the results showed that:(1) Adjusting the working surface for air flow, the air velocity by a2.11m/s becomes1.6m/s, the cooling zone of5-43m, shortened7-19m,spontaneous combustion with amaximum width of160m, shortening the15m,suffocation with Face195m away from thearea later.(2) In the Face-corner sealing, air leakage significantly reduced, where the vastmajority of air leakage is closed by a wall of loose coal mined-out area outside of theinflow, through on the corners and into the return airway, spontaneous combustion with allthree goes some distance toward the face, namely the cooling zone s hortened by about16m,spontaneous combustion with reduced about10m, suffocation with a range of200m fromthe Face after.(3) the work surface, corner after corner under seal for plugging and changing wind, Gob three with distribution significantly reduced, cooling with reduced approximately21m,with a maximum reduction of spontaneous combustion35m, suffocation with a distanceFace After175m within range.(4) Non-Segmented nitrogen injection of3360m3/h, without changing the nitroge ninjection case, nitrogen injection position selected from Face30,40,50,60m, results showedthat: when D=50m, the mining Three empty area with the smallest range, spontaneouscombustion with the widest of65m, safe recovery rate of2.7m/d, less than the workingface of the advance, meet the requirements of safe production, to some extent, can reducethe risk of spontaneous combustion.