Experimental Study on the Inhibition of Spontaneous Combustion of Low Rank Coal by I-AO Ultrafine Particle Aerosol
Aiming at the problem of coal spontaneous combustion disaster,an efficient composite ultrafine particle aerosol for inhibiting coal spontaneous combustion was synthesized by using iodine-containing inorganic salts(NaI and KI)and antioxidant N-phenyl-1-naphthylamine.The changes of spontaneous combustion characteristics of coal samples as well as the distribution and quantity of functional groups were analyzed by simultaneous thermal analysis(TG-DTG-DSC)and FTIR spectroscopy.The surface pore structure changes of coal samples during low-temperature oxidation were observed by scanning electron microscopy.The experimental results show that the activation energy of coal samples treated with iodized salt and antioxidants increased by 7.22%,11.14%and 47.77%respectively in the three stages of water evaporation,pyrolysis and combustion.In addition,the number of-OH groups decreased by an average of 27.89%,and the number of oxygen-containing functional groups mainly including carbon-oxygen bonds(Ar-O-C),carboxyl(—COOH)and C=O bonds decreased by an average of 40.62%.These results indicate that the composite ultrafine particle aerosol formed by the combination of iodine-containing inorganic salts and antioxidants has a significant inhibitory effect on the whole combustion process of lignite,and has a good potential in the field of prevention and control of coal spontaneous combustion in goaf.