Study on spontaneous combustion characteristics and MgCl2 inhibition effect of air-dried coal soaked in water
This study delves into the spontaneous combustion characteristics of residual coal in goaf after water immersion and the inhib-itory effects of MgCl2 inhibitor on the oxidation of coal soaked in water.Utilizing a low temperature coal oxidation experimental system and Fourier Transform Infrared Spectroscopy(FTIR),we analyzed the variations in functional groups of original coal samples and those immersed for 30,90,and 150 days,as well as under the influence of MgCl2.Experimental result show that the longer the immersion time and the higher the content of fatty hydrocarbons,the stronger the low temperature oxidation activity of the coal body,and the inhibitory effect of the inhibitor gradually weakens.As the immersion time increases,the decrease in—CH2,—CH3,—OH,and—COOH content gradually expands,while the increase in C=O content gradually increases.In the early stage of oxidation and heating up,MgCl2 inhibi-tor has a better inhibitory effect on the coal oxidation process,but its inhibitory effect decreases in the later stage,and its inhibitory effect on the coal oxidation process gradually weakens.The longer the coal is immersed in water,the stronger the oxidation activity of the air-dried coal,and the higher the concentration of CO produced.The inhibitory effect of MgCl2 inhibitor on coal oxidation also weakens over time.Based on the above findings,it is suggested to enhance temperature monitoring in goaf and periodically supplement MgCl2 in-hibitors to long-term water-immersed and subsequently air-dried coal layers,thus reinforcing the suppression of coal oxidation processes and preventing spontaneous combustion in such coal seams within the goaf.
inhibitorcoal soaked in waterlow temperature oxidationfunctional groupsCO concentration
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