煤微观基团与自然发火危险性相关分析
Correlation analysis of coal micro-groups and spontaneous combustion risk
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摘要: 为了研究煤微观基团与煤自然发火过程中放热特征之间的联系，采用差示扫描量热实验和红外光谱实验研究了不同变质程度煤样在煤自燃过程中的热特征参数与微观基团变化。结果表明：随着变质程度的增大，弱黏煤、肥煤、焦煤、无烟煤的芳香族化合物含量逐渐增大，分别为33.7%、39.8%、47.5%、65.4%，而含氧官能团的含量则逐渐降低，分别为53.2%、50.5%、43.6%、24.6%。利用高斯混合模型确定了煤放热过程中的燃点温度，结果表明高变质程度煤有更高的燃点和更低的自燃危险性。利用皮尔逊相关系数法确定了煤燃点与微观基团之间的关系，结果表明含取代苯，-C=C-，和-CH3更多的煤的燃点温会更高，自燃危险性会减小，而含有更多-CH2和-COOH的煤则恰好相反。Abstract: In order to investigate the link between the microscopic groups of coal and the exothermic characteristics of coal during spontaneous combustion, the thermal parameters and microscopic groups of coal samples with different degrees of metamorphism were investigated by differential scanning calorimetry and infrared spectroscopy during the spontaneous combustion of coal. The results show that the content of aromatic hydrocarbon compounds in weakly caking coal, fat coal, coking coal and anthracite gradually increases with the increasing degrees of metamorphism, at 33.7%, 39.8%, 47.5% and 65.4%, respectively, while the content of oxygen-containing functional groups gradually decreases, at 53.2%, 50.5%, 43.6% and 24.6%, respectively. A Gaussian mixing model was used to determine the ignition point temperature of the coal during exothermic process. The results indicate that coal with high degree of metamorphism have higher ignition point and lower risk of spontaneous combustion. More recently, the relationship between coal ignition point and microscopic groups was determined by using Pearson correlation coefficient method. The results indicate that coals containing more substituted benzene, -C=C-, and -CH3 will have a higher ignition point temperature and a reduced risk of spontaneous combustion, while the opposite is true for coals containing more -CH2 and -COOH.
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