林清侠, 汪澍, 金龙哲, 欧盛南. 基于13C−NMR和FTIR的煤尘润湿性定量表征[J]. 工程科学学报, 2022, 44(11): 1844-1851. DOI: 10.13374/j.issn2095-9389.2021.03.23.001
引用本文: 林清侠, 汪澍, 金龙哲, 欧盛南. 基于13C−NMR和FTIR的煤尘润湿性定量表征[J]. 工程科学学报, 2022, 44(11): 1844-1851. DOI: 10.13374/j.issn2095-9389.2021.03.23.001
LIN Qing-xia, WANG Shu, JIN Long-zhe, OU Sheng-nan. Quantitative characterization of coal dust wettability based on 13C−NMR and FTIR[J]. Chinese Journal of Engineering, 2022, 44(11): 1844-1851. DOI: 10.13374/j.issn2095-9389.2021.03.23.001
Citation: LIN Qing-xia, WANG Shu, JIN Long-zhe, OU Sheng-nan. Quantitative characterization of coal dust wettability based on 13C−NMR and FTIR[J]. Chinese Journal of Engineering, 2022, 44(11): 1844-1851. DOI: 10.13374/j.issn2095-9389.2021.03.23.001

基于13C−NMR和FTIR的煤尘润湿性定量表征

Quantitative characterization of coal dust wettability based on 13C−NMR and FTIR

  • 摘要: 为从微观角度研究煤尘润湿性影响因素,探究分子结构参数与煤尘润湿性之间的定量关系,选取3种不同煤阶的煤样进行煤质特征分析以及煤尘润湿性接触角测定,同时通过13C核磁共振(13C−NMR)和红外光谱(FTIR)实验,获得了煤分子结构参数,利用SPSS进行煤分子结构参数与接触角的相关性分析,最后,通过MATLAB进行在3种不同类型表面活性剂作用下的煤尘润湿性定量表征方程的构建。结果表明:在不同类型表面活性剂的作用下,影响煤尘润湿性的主要因素不同,主要为: 13C−NMR结构参数中的季碳、亚甲基和次甲基(f_\textal^\textH)、酚或芳醚碳(f_\texta^\textP)、桥接芳碳(f_\texta^\textB),FTIR结构参数中的酯基(−COO−)、醚基(−O−)、羰基(C=O),可依据构建的定量表征方程,利用煤尘微观分子结构数据,快速进行煤尘润湿性的表征,进一步丰富了煤尘润湿的微观机理。

     

    Abstract: Improving the wettability of coal dust is commonly used for dust control in coal mines. The wettability of coal dust can be affected by various factors. This study aims to explore the quantitative relationship between coal dust molecular structure parameters and wettability at a micro level. We selected three samples with different coal ranks, which were labeled as the Shangwan nonstick coal (BN), Zhaolou gas-fast coal (QF), and Yangquan anthracite coal (WY) respectively, and were crushed to coal dust with a particle size of less than 200 mesh (74 μm). Three different types of surfactants, i.e., alkylphenol polyoxyethylene ether (OP-10), sodium diethylhexyl sulfosuccinate (rapid penetrant T), and hexadecyl trimethyl ammonium-chloride (1631), were used for wetting coal dust. Carbon-13 nuclear magnetic resonance (13C-NMR) and infrared spectroscopy (FTIR) tests were conducted to obtain the microscopic molecular structure parameters of the coal samples. Then the relativity between the contact angle and 13C-NMR structural parameters/FTIR structural parameters were analyzed via the SPSS software to determine the principal factors. Finally, quantitative characterization equations describing the relationship between the wettability and molecular structure parameters of the studied samples were established through multiple linear regressions. Results revealed that under the action of different surfactants, the main factors affecting the wettability of coal dust are different. These factors mainly include quaternary carbon (f_\textal^\text\textH), oxygen-connecting aliphatic carbon (f_\texta^\text\textP), and aromatic bridge carbon (f_\texta^\text\textB) in 13C−NMR experiments and the ester group (−COO−), ether group (−O−), and carbonyl group (C=O) in FTIR experiments. The quantitative characterization equations established in this study provide a micro insight to understanding the affecting mechanism of coal dust wettability, which could facilitate the selection of surfactants and improve the reduction efficiency of coal dust.

     

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