To obtain the combustion characteristics of coal gangue in O2/CO2 atmospheres,the effects of O2 concentration,heating rate,and particle size on the combustion characteristics of coal gangue were considered,and kinetic analysis was conducted by two kinetic methods.The results indicated that with same O2 concentration,the combustion process of coal gangue in O2/CO2 atmosphere was delayed compared to O2/N2 atmosphere,and the decrease of O2 concentration weakened the influence of CO2 on the combustion behavior of coal gangue.The ignition temperature and burnout temperature of coal gangue in O2/CO2 atmosphere increased with the increase of heating rate,and the temperature range where weight loss occurred became wider.Compared with large-particle coal gangue,the combustion weight loss process of smaller-particle size was advanced,so reducing the particle size of coal gangue helped improve its combustion performance.Under the same conditions,the ignition temperature and burnout temperature of coal gangue in O2/CO2 atmosphere were higher than those in O2/N2 atmosphere,while the maximum weight loss rate and comprehensive combustion index were lower.Within the range of experimental O2 concentration,the combustion reaction of coal gangue in O2/CO2 atmosphere conformed to the first-order reaction kinetics model,and the apparent activation energy of coal gangue in O2/CO2 atmosphere was higher than that in O2/N2 atmosphere.
coal gangueO2/CO2 atmospherecombustion characteristicsorder of reactionactivation energy
万方数据
