基于HRTEM的低阶烟煤微晶结构研究

为充分认识煤的微观结构，主要针对神府矿区张家峁煤的微晶结构进行研究。利用HRTEM对煤进行分析获得微晶的晶格条纹，利用基于FFT-IFFT的图像分析方法对晶格条纹进行解析，计算得到煤中微晶的长度及其分布，并与芳核结构参数进行关联。根据煤的微晶长度和芳香度，对煤的平均分子量及其分子量分布进行计算。研究结果表明，神府张家峁煤的微晶长度主要分布在0.25～1.00 nm，对应的多核芳环数在2～4。该煤的平均分子式为C24.63H16.68O4.55，其平均分子量为385.04，分子量主要分布在100～1 400。

Structural alignment of low rank coal using HRTEM technique

The coal microstructure is conducive to rationalizing coal reactivity.The present study is to make a quantitative evaluation on the microstructure of Zhangjiamao coal taken from Shenfu coal basin in terms of microcrystal.The digitized image acquired from HRTEM was processed to extract the lattice fringes of graphite crystal based on FFT-IFFT method.The distribution of microcrystal length was statistically calculated.On the basis of the microcrystal length and calculated aromaticity,the molecular weight of coal and its distribution could also be obtained.The results show that the length range of lattice fringe is 0.25-1.00 nm and the aromatic ring numbers are 2-4.The obtained elemental composition of Zhangjiamao coal is C24.63H16.68O4.55.The predicted average molecular weight is 385.04,and the distribution for the fringes is focused on 100-1 400.