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为了研究煤样挥发分、氧化程度及燃烧时氧气浓度对煤样燃烧难易程度的影响,设计并完成有关相应影响因素的3组热重分析(TGA)试验。采用等转化率法和特征温度分析法进行数据分析。结果表明:特征温度法显示煤燃烧时高挥发分煤样的特征温度较其他煤样低;等转化率法显示高挥发分煤样的各转化率下活化能也均低于其他煤样。2种方法的分析结果一致,都显示挥发分含量高的煤样较其他煤样易于燃烧。分析不同氧化程度下的煤样燃烧热重曲线和不同燃烧时氧浓度情况下的热重曲线得出,氧化程度越高,燃烧时氧浓度越高,煤越早开始燃烧,燃烧速度也越快。
In order to study the influence of the volatiles and the degree of oxidation of coal samples on the combustion ease of coal samples, three TGA tests were designed and completed. Equal conversion method and characteristic temperature analysis were used for data analysis. The results show that the characteristic temperature method shows that the characteristic temperature of high volatile coal samples is lower than that of other coal samples when the coal is burned. The equal conversion rate method shows that the activation energy of each high conversion coal sample is also lower than that of other coal samples. The results of the two methods are consistent, showing that coal samples with high volatile content are more likely to burn than other coal samples. The thermogravimetric curves of coal combustion at different oxidation levels and the oxygen concentration at different combustion stages were analyzed. The higher the degree of oxidation, the higher the oxygen concentration at combustion, the earlier the coal began to burn, the faster the combustion rate .