盘江矿区焦煤和无烟煤的傅里叶红外光谱分析探讨  

Discussion on Fourier transform infrared spectroscopy analysis of coking coal and anthracite in Panjiang mining area

作　　者：苟仁涛 江成玉[1,2] 许石青 林华颖[1] 焦安军 王沉 GOU Rentao;JIANG Chengyu;XU Shiqing;LIN HuayingJIAO Anjun;WANG Chen(School of Mining,Guizhou University,Guiyang 550025,China;Guizhou Mining Safety Technology Engineering Center for Complex Geology,Guizhou Province,Guiyang 550025,China)

机构地区：[1]贵州大学矿业学院,贵州贵阳550025 [2]贵州省复杂地质矿山开采安全技术工程中心,贵州贵阳550025

出　　处：《冶金分析》2023年第6期69-76,共8页Metallurgical Analysis

基　　金：国家自然科学基金(52174072);贵州省科技计划(黔科合支撑[2021]一般354、黔科合支撑[2019]2887)。

摘　　要：煤的化学组分及结构与其理化性质密切相关。为探究贵州盘江矿区不同变质程度煤对煤体官能团分布特征及其结构参数差异的影响,选取贵州盘江矿区具有代表性的焦煤(中变质程度煤)和无烟煤(高变质程度煤),采用傅里叶红外光谱(FTIR)进行了测试分析,并结合分峰拟合技术对两种煤的官能团特征及结构参数进行了对比分析。FTIR分析表明:随着煤变质程度的加深,煤中的水分及挥发分质量分数由1.60%、28.8%减少到1.28%、9.10%,固定碳质量分数由60.59%增加至77.69%。通过分峰拟合分析可知,随着煤变质程度的加深,含氧结构的成分及甲基基团逐渐减少,拟合度总体比芳香烃结构和脂肪烃结构略低,亚甲基的含量高于甲基的含量,氧化过程中亚甲基表现得更为活跃。结构参数的计算结果表明,随着煤的变质程度的加深,芳香度(I)由0.43增加至1.12,芳香环缩聚程度(DOC)由2.18增加至5.90,成熟度(M)由0.81增加至0.97,说明脂肪链长程度逐渐减小,支链化程度不断增大,有机质也逐渐增多。The chemical composition and structure of coal are closely related to its physical and chemical properties.In order to explore the influence of different metamorphic degree of coal in Panjiang mining area of Guizhou on the distribution characteristics of functional groups and the difference of structural parameters of coal,the representative coking coal(medium metamorphic grade coal)and anthracite(high metamorphic grade coal)in Panjiang mining area of Guizhou were selected and tested by Fourier transform infrared spectroscopy(FTIR).Combined with peak fitting technology,the functional group characteristics and structural parameters of two kinds of coal were compared and analyzed.The results showed that with the deepening of coal metamorphism degree,the mass fraction of moisture and volatile matter in coal decreased from 1.60%and 28.8%to 1.28%and 9.10%,respectively.Meanwhile,the mass fraction of fixed carbon increased from 60.59%to 77.69%.It could be seen from the peak fitting analysis that the component of oxygen-containing structure and methyl group gradually decreased with the increase of coal metamorphism degree,and the fitting degree was slightly lower than that of aromatic hydrocarbon structure and aliphatic hydrocarbon structure.The content of methylene was higher than that of methyl,and methylene was more active in the oxidation process.The calculation results of structure parameter showed that the aromaticity(I)increased from 0.43 to 1.12 with the increase of coal metamorphism degree.Meanwhile,the aromatic ring condensation degree(DOC)increased from 2.18 to 5.90,and the maturity(M)increased from 0.81 to 0.97,indicating that the degree of aliphatic chain length gradually decreased,the degree of branching increased,and the organic matter also gradually increased.

关 键 词：傅里叶红外光谱(FTIR) 焦煤 无烟煤 煤化学结构 分峰拟合 

分 类 号：TQ533[化学工程—煤化学工程] O657.33[理学—分析化学]