Closed Oxygen Consumption Experiment Of Coal Spontaneous Combustion And Its Application

Coal spontaneous combustion has become a major problem in coal mine safety.In recent years,the research on spontaneous combustion of coal has been carried out continuously.At present at home and abroad mainly through coal oxidation test bed for coal oxidation spontaneous combustion characteristics,0.85t-15t coal loading of large experimental platform,80g～100g small coal open Program Temperature test,1g～50g small coal sample thermogravimetry test.For experiments that are easy to replace,it is possible to do multiple experiments at the same time and to have a coal-representative medium coal sample(several kg to ten kg),still in the exploration.2.5kg medium coal sample closed oxygen consumption experimental platform was established,the oxygen consumption rate under different oxygen concentration was obtained,according to the characteristics of the oxygen concentration in the sealed coal sample tank.And the different temperature and different coal closed oxygen consumption experiments was conducted to analysis of oxygen consumption characteristics of coal with oxygen consumption rate,CO production rate and CO production ratio as an indicator.The oxygen consumption rate of W-722 coal samples in Xiaonan Mine was obtained by oxygen consumption.The oxygen concentration of the asphyxial zone was 8.1%.The numerical simulation of CFD mined-out area was carried out with the experimental results.The distance from choking zone boundary line of goaf in inlet side to working face is 160m.The distance of site measurement from choking zone boundary line of goaf in inlet side to working face is 148m,and the corresponding asphyxia oxygen concentration is 8.5%,the position and calibrated oxygen concentration value of choking zone are closed to the simulation results.Therefore,the spontaneous combustion characteristics of coal with coal seam can be easily obtained by the closed oxygen consumption experiment with coal medium coal sample,which provides a reliable basis for other numerical simulation based on coal spontaneous combustion parameters and in-depth study,and is of great significance to prevent of spontaneous combustion in goaf and ensure safe production...