易自燃煤漫反射红外光谱特征

Infrared diffuse reflectance spectral signature of spontaneous combustion coal

为了更好地模拟煤低温氧化阶段的化学结构变化，分析了漫反射及透射红外谱图，利用漫发射红外光谱分析了自燃倾向性不同的煤样原煤及低温氧化煤的化学基团，探讨了煤样中芳烃、脂肪烃和含氧官能团在低温氧化过程中的变化规律．结果表明：漫反射红外光谱法在研究颗粒表面氧化过程中的化学成分变化比透射法更加灵敏，得出了易自燃煤与不易自燃煤低温氧化前后的微观结构差异，其中，1596～1604cm^-1处的芳香烃（C=C），1640～1650cm^-1处的酰氨（-CO—N-），1736～1722cm^-1含氧官能团（C=0）和1900～1910cm^-1处的脂肪烃（C—C）存在明显差异．

For better simulating chemical construction change of coal at low temperature oxidation, analyzed the similarities and differences between infrared diffuse reflectance and transmission spectrophotometry, using infrared diffuse reflectance spectrum, analyzed the chemistry radical of the original and the low-temperature oxidation coal which has different spontaneous combustion tendency, and discussed the variational law of the aromatic hydrocar- bon, aliphatic hydrocarbon, and oxygenous functional group from coal in the process of low-temperature oxidation. The results show that diffuse reflectance is more sensitive than transmission spectrophotometry in the study of the process of grain surface oxidation. It gets micromechanism differences between free-burning and apyrous run coal for low temperature oxidation from beginning to end, thereinto, aromatic hydrocarbon （C = C ） in 1 596 1 604 cm^-l, acylamino（-CO-N-） in 1 640 - 1 650 cm^-1 , oxygenous functional group （C = O） in 1 736- 1 722 cm^-1 and aliphatie hydrocarbon （C-C） in 1 900 -1 910 cm^-1 have obvious discrepancy.