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本文将大同烟煤分为低(<1.4 g/cm~3)、中(1.4～2.0 g/cm~3)、高(>2.0 g/cm~3)3个密度段,进行不同密度原煤的工业和元素分析,利用热重分析仪研究了O_2/N_2、O_2/CO_2气氛(不同氧气浓度下)各样品的燃烧特性,并开展了反应动力学分析。结果显示在O_2/CO_2气氛下,随煤粉密度增加,煤粉最大失重速率减小,最大放热速率减小,燃尽温度升高;提高氧气浓度可降低燃尽温度。与O_2/N_2气氛相比,在氧气浓度相同的条件下,各样品在O_2/CO_2气氛下的着火温度、燃尽温度、表观活化能均升高。
In this paper, Datong bituminous coal is divided into three grades (low density 1.4 g / cm 3, medium density 1.4 g / cm 3 and high density 2.0 g / cm 3) And elemental analysis, the combustion characteristics of each sample in O 2 / N 2 and O 2 / CO 2 atmospheres (at different oxygen concentrations) were investigated by thermogravimetric analyzer, and the reaction kinetics analysis was carried out. The results show that under the O2 / CO2 atmosphere, with the increase of coal density, the maximum weight loss rate of coal decreases, the maximum heat release rate decreases, and the burnout temperature increases. Increasing the oxygen concentration can reduce the burnout temperature. Compared with O 2 / N 2 atmosphere, under the same oxygen concentration, the ignition temperature, the burnout temperature and the apparent activation energy of each sample increased in O 2 / CO 2 atmosphere.