Initial temperature and spontaneous combustion tendency of 4# coal seam oxidation in Binchang mining area based on experimental analysis
In order to deeply study the influence of micro pores and functional group distribution of coal samples on coal spontaneous combustion under different initial temperatures,thermogravimetric analysis experiments,infrared spectroscopy experiments and mercury intrusion experiments were conducted at room temperature,30 ℃,40 ℃,50 ℃ and 60 ℃,respec-tively.It was found that the dry cracking temperature of coal samples at 40℃was much higher than that at other tempera-tures,and its growth rate was also the highest,The functional group of the coal sample at 40℃is in a small peak state.Cor-respondingly,the porosity of the coal sample at 40℃in the mercury intrusion test is also large,indicating that the pore vol-ume of the coal sample at this temperature is large,the more active structures are exposed to the air,the greater the degree of coal oxygen recombination,the greater the oxidation rate,the greater the exothermic intensity,the easier the heat is to ac-cumulate,and the stronger its spontaneous combustion.In addition,there are many holes in the small holes at 40℃,and their specific surface area is large,providing more adsorption points for oxygen,which is the main force for the increase of oxy-gen uptake.The thermogravimetric experiment results show that the coal sample treated at 40 ℃ has the highest oxygen uptake temperature and the largest oxygen uptake,which corresponds to the number of holes in the small holes of the coal sample at 40 ℃.From the perspective of thermogravimetric oxygen uptake,the 40 ℃ coal sample is also the most active.Therefore,the coal sample at high temperature for a long time has a greater tendency of spontaneous combustion,strong activity,and easy to promote coal spontaneous combustion process.
coal spontaneous combustionhigh temperature oxidationspectral peak intensitypore size distribution
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维普
