不同变质程度煤尘润湿性差异的13C-NMR特征解析

为探究不同变质程度煤尘微观分子结构参数对其润湿性的影响，利用13C-NMR试验获取了6种不同变质程度煤尘的碳骨架结构参数，采用光学法液滴形态分析系统对不同煤种煤尘的润湿接触角进行了测定。根据试验结果，得到了芳碳和脂碳结构参数随变质程度的变化规律，并利用SPSS软件分析得到了煤尘润湿性的主要影响因子为f〖KG-*6〗′〖KG-*2〗a，f〖KG-*6〗Ha，f〖KG-*6〗Ba，f〖KG-*6〗Pa，f〖KG-*6〗Hal，f〖KG-*6〗Oal。针对芳碳，随着f〖KG-*6〗′〖KG-*2〗a，f〖KG-*6〗Ba，f〖KG-*6〗Ha含量的增加，f〖KG-*6〗Pa含量的减小，煤尘的疏水性增强；针对脂碳，随着f〖KG-*6〗Hal与f〖KG-*6〗Oal含量的减少，煤尘的亲水性减弱。最终，通过煤尘润湿性影响因子变化率的分析，得到了不同变质程度煤尘润湿性差异的微观机理，实现了对传统煤尘润湿理论的改进与拓展。

Characteristic analysis of 13C-NMR for the wettability difference of coal dust with diverse degrees of metamorphism

To explore the effect of microscopic molecular structure parameters’ changes on the wettability of coal dust with the different degrees of metamorphism,a 13C-NMR experiment was conducted to obtain the structural parameters of the carbon skeletons of six kinds of coal dust with varying metamorphic degrees,and an optical droplet shape analysis system was used to determine the wetting contact angles of the coal dust.According to the test results,the structural parameters’ variation of aromatic carbon and aliphatic carbon with metamorphic grades was achieved,which shows that the main impact factors of coal dust wettability are f〖KG-*6〗′〖KG-*2〗a,f〖KG-*6〗Ha,f〖KG-*6〗Ba,f〖KG-*6〗Pa,f〖KG-*6〗Hal and f〖KG-*6〗Oal from the analysis of the SPSS software.For aromatic carbon,with the increase of f〖KG-*6〗′〖KG-*2〗a,f〖KG-*6〗Ba,f〖KG-*6〗Ha and the decrease of f〖KG-*6〗Pa,the dust hydrophobic was enhanced;with the decrease of f〖KG-*6〗Hal and f〖KG-*6〗Oal for aliphatic carbon,the dust hydrophilic was weakened.Finally,with the analysis of the changing rates of coal dust wetting impact factors,the microscopic mechanism about the wettability difference of different coal dust was achieved,which is useful for improving and expanding the traditional wetting theory of coal dust.