Research on the inhibitory effect of flue gas on the spontaneous combustion characteristics of residual coal in goaf
To study the inhibitory effect of flue gas on the spontaneous combustion of residual coal in goaf,the influences of various components in flue gas on the gas release characteristics of residual coal in the low-temperature oxidation process of Sandaogou goaf,and the adsorption capacity and competitive adsorption selectivity of coal were analyzed,on the basis,the competitive adsorption and dilution effects of flue gas components on the inhibition of coal spontaneous combustion characteristics during low-temperature oxidation were explored,revealing the inhibitory effect mechanism of flue gas on the coal spontaneous combustion characteristics.The results indicated that flue gas could preferentially occupy adsorption sites through the competitive adsorption effect of key component CO2,while reducing the concentration of O2 in the environment through the dilution effect of flue gas,thereby reducing coal oxygen contact,inhibiting coal oxygen composite reactions,and slowing down the low-temperature oxidation process of residual coal.By numerical simulation,the changes of oxidation zone under different injection conditions in the goaf was studied,which showed that the width of the oxidation zone decreased after gas injection and moved towards the working face,and the optimal gas injection position was finally determined to be 156 m away from the working face on the inlet side,and the optimal gas injection flow rate was 1 205 m3/h.
residual coal in goafcoal spontaneous combustionpower plant flue gascompetitive adsorptiondilution
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