Experimental study on inhibiting effect of N2 and CO2 on coal spontaneous combustion
In order to study the effects of CO2 and N2 on inhibiting coal spontaneous combustion oxidation,based on the adsorption and low temperature oxidation experimental system,the change law of free radicals in coal under dry air,N2+dry air mixture and CO2+dry air mixture were studied,as well as the production process of the marker gas CO.The experiment shows that the adsorption capacity of coal for different gases increases linearly with the adsorption pressure during the pressure rise stage of 0-0.1 MPa;the physical adsorp-tion capacity of coal to gas satisfies the relationship of CO2＞O2＞N2,and both free radical concentration and CO concentration increase with the increase of temperature,but the growth rate and range under inert conditions are significantly lower than those under dry air condition.It can be seen that inert gas can inhibit the low temperature oxidation of coal.Through the numerical comparison of the inhibi-tion effect,the inhibition effect of CO2 at each temperature stage is better than that of N2.The research results are of great significance to guide the prevention and control of spontaneous combustion in goaf.
inert gaslow temperature oxidation of coalfree radicalCO concentration
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