大隆煤升温氧化时煤表面的介观特性

采用内置样品电加热装置的原子力显微镜对低温氧化过程大隆矿-390 m煤样表面形态进行实验观测,得到不同氧化温度下煤表面形态特征.根据分形理论的功率谱密度法计算煤表面的分形维数,并进行了分析.结果表明,不同氧化温度下煤表面的分形维数值都在2～3,煤低温氧化过程符合一定的分形规律,随着氧化温度的增加,表面分形维数呈增大趋势,表明分形维数的大小可以反映煤氧化的不同程度.而采用原子力显微镜结合分形理论研究煤自燃氧化的微观结构的变化是一个新的研究途径.

Experiment analysis of coal surface mesoscopic-characteristic in lower temperature oxidation process

The surface of Dalong -390 m coal was observed in lower temperature oxidation process by atomic force microscope inside which an electric heating device was set. The conformation character of Dalong -390 m coal was obtained in different oxidation temperature. According the power spectral method based on fractal theory, the values of fractal dimension of coal were calculated and analyzed. The result indicated that the values of fractal dimension were in the range of 2 - 3. During lower temperature oxidation process of coal, there is obvious fractal characteristic and the value of fractal dimension increases when the oxidation temperature lifts. It is conclusion that the values of fractal dimension illuminated the degree of coal oxidation. Moreover, it is a new study method to study the microstructure of coal in sponta neous combustion process using AFM and combing fractal theory.