Abstract: The combustion experiments of Xiaolongtan young brown coal and Fuyuan bituminous coal were carried out by a simultaneous thermal analyzer at different oxygen volume fractions under the mixed O2/CO2 atmosphere, and the combustion and kinetic parameters of the two pulverized coals determined based on experimental results. The results showed that when O2 concentration increased from 21% to 80%(j), the ignition temperature of two coals was reduced from 591.65 and 756.15 K to 561.55 and 722.45 K, and the combustion temperature from 898.75 and 984.95 K to 721.05 and 872.45 K, respectively. The burning time was shorten and the composite combustion characteristic index increased with increasing of the oxygen concentration. In addition, there was an upward trend of the frequency factor of two coal samples. Specifically, the activation energy of Xiaolongtan young brown coal increased, and the activation energy of Fuyuan bituminous coal in the high temperature stages became flat as the oxygen concentration was 30% or above. The activation energy and frequency factor of Fuyuan bituminous coal were higher than those of another coal. Kinetic compensation effect existed clearly between the activation energy and frequency factor under different oxygen concentrations.

Key words: pulverized coal, mixed O2/CO2 atmosphere, combustion, thermogravimetry, kinetics, compensation effect

摘要： 在同步热分析仪上分别对年轻褐煤(小龙潭煤)和烟煤(富源煤)进行了不同O2含量下的O2/CO2燃烧特性实验，确定其燃烧特性参数及动力学参数. 结果表明，随氧气浓度从21%增大到80%(j)，小龙潭年轻褐煤和富源烟煤的着火温度分别从591.65和756.15 K降到561.55和722.45 K，燃尽温度分别从898.75和984.95 K降到721.05和872.45 K，燃烧时间缩短，综合燃烧特性指数增大，煤粉的频率因子呈上升趋势，小龙潭年轻褐煤的活化能增大，高温段富源烟煤在氧气浓度达30%(j)及以上时活化能变化趋于平缓，后者的反应活化能和频率因子高于前者. 在不同氧气浓度下，两种煤粉的活化能E和频率因子A之间存在动力学补偿效应.

关键词: 煤粉, O2/CO2气氛, 燃烧, 热重分析, 动力学, 补偿因子