| 引用本文: | 刘冬冬,高继慧,吴少华,秦裕琨.热解过程煤焦微观结构变化的XRD和Raman表征[J].哈尔滨工业大学学报,2016,48(7):39.DOI:10.11918/j.issn.0367-6234.2016.07.006 |
| LIU Dongdong,GAO Jihui,WU Shaohua,QIN Yukun.XRD and Raman characterization of microstructure changes of char during pyrolysis[J].Journal of Harbin Institute of Technology,2016,48(7):39.DOI:10.11918/j.issn.0367-6234.2016.07.006 |
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| 摘要: |
| 为深入了解煤焦微观结构在热解过程的变化规律,对霍林河褐煤(HLH)、大同烟煤(DT)、鸡西烟煤(JX)和晋城无烟煤(JC)进行热解实验(25～1 600 ℃),采用X射线衍射(XRD)和拉曼光谱(Raman)获取煤焦微观结构信息,并对两者数据的关联性进行分析．结果表明,热解过程煤焦微观结构的变化存在明显的3个阶段,分别对应解聚与流动、热缩聚与芳构化、石墨化．当La＜3 nm, ID1/IG和ID4/IG随La的增大而增加;当La>3 nm,ID1/IG和ID4/IG随La的增大而减小,表明层片在不同尺寸内发生改变,其相互连接方式和缺陷数量也不相同．Lc分别与ID3/IG和Raman谱峰总积分面积成反比,表明无定形sp2碳原子多存在于芳香片层的夹层间,且与芳香结构活性有关．
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| 关键词: 煤热解 微观结构 X射线衍射 拉曼光谱 相关性 |
| DOI：10.11918/j.issn.0367-6234.2016.07.006 |
| 分类号:TQ530.2 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51276052) |
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| XRD and Raman characterization of microstructure changes of char during pyrolysis |
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LIU Dongdong, GAO Jihui, WU Shaohua, QIN Yukun
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(School of Energy Science and Engineering,Harbin Institute of Technology, Harbin 150001, China)
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| Abstract: |
| To deeply understand the changes of char microstructure, the pyrolysis experiments of Huolinghe lignite(HLH), Jixi bituminous coal(JX), Datong bituminous coal (DT) and Jincheng anthracite (JC) were carried out at 25～1 600 ℃. The microstructure information of char was obtained by X-ray diffraction (XRD) and Raman spectroscopy (Raman), of which the relationship was studied. The result demonstrates that the microstructure changes of char have obvious three stages: depolymerization and liquidity, thermal condensation and aromatization, and graphitization. When La ＜3 nm, ID1/IG and ID4/IG increase with the increase of La; When La>3 nm, ID1/IG and ID4/IG decrease with the increase of La, indicating that the mode of connection and the number of defects are relate to the change of the size of aromatic layers at different scales. Lc is inversely proportional to ID3/IG and the total integrated area of Raman, indicating that the amorphous sp2 carbon atoms exist in the interlayer of the aromatic layer, which is related to the activity of the aromatic structure.
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| Key words: coal pyrolysis microstructure structure X-ray diffraction raman spectroscopy correlation |
