Impacts of chemical fractionation on Zhundong coal's chemical structure and pyrolysis reactivity
Impacts of chemical fractionation on Zhundong coal's chemical structure and pyrolysis reactivity
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化学分馏对准东煤化学结构和热解反应活性的影响
DOI：
10.1016/j.fuproc.2016.05.011
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发表时间：
2017
影响因子：
7.5
通讯作者：
Sun Shao-Zeng
中科院分区：
文献类型：
--
作者：
Zhao Yan;Liu Li;Qiu Peng-Hua;Xie Xing;Chen Xi-Ye;Lin Dan;Sun Shao-Zeng
研究煤在热解过程中的结构变化是评价矿物在热解过程中催化作用的前提。首先对准东原煤进行了化学分馏处理，然后用热重分析仪(TGA)测定了原煤的热解反应活性。为了了解样品的化学结构，采用了傅里叶变换红外光谱(FT-IR)和一系列原始的红外结构参数。最后，建立了红外光谱结构参数与热解活性之间的关系。结果表明，准东煤的无机矿物组成和有机质化学结构与其他低变质煤不同。稀硫酸洗涤可以增加羧基和酚羟基的含量，但对脂肪氢含量、芳香氢含量和氢原子在脂肪族和芳香族结构中的分布影响不大。采用浓HCl/HF洗涤工艺可以进一步提高羧基含量，但对酚羟基含量影响不大。此外，洗涤还可以缩短脂肪族侧链和桥键，导致芳环融合程度降低，取代度提高。稀硫酸和浓HCl/HF洗涤提高了准东煤的热解活性。最后，回归了红外结构参数S与热解反应性之间的关系，证明该关系式对预测煤的热解反应性是有效的。
The investigation to the structure change of coal during demineralization is the prerequisite in evaluating the minerals' catalytic action in pyrolysis. In the study, Zhundong raw coal samples were first treated using the chemical fractionation method, and then the pyrolysis reactivities of the samples were measured on a thermogravimetric analyser (TGA). In order to understand the chemical structures of the samples, the Fourier transform infrared spectroscopy (FT-IR) and a series of original infrared structure parameters were employed. Finally, a correlation was established between the infrared structural parameters and the pyrolysis reactivity. It is indicated that the characteristic of Zhundong coal is different from other low-rank coals in inorganic mineral composition and chemical structure of organic matter. Dilute sulfuric acid washing can increase the carboxyl group and phenolic hydroxyl group contents, but has insignificant impacts on aliphatic hydrogen content, aromatic hydrogen content, and hydrogen atom distributions in aliphatic and aromatic structures. Washing process using concentrated HCl/HF can further increase the carboxyl group content but has little impact on the phenolic hydroxyl group content. In addition, the washing can also shorten the aliphatic side chains and bridge bonds, causing the aromatic ring fusing lower and substitution higher. Dilute sulfuric acid and concentrated HCl/HF washings increase the pyrolysis reactivity of Zhundong coal. Finally, a correlation was regressed between the infrared structural parameterSand the pyrolysis reactivity, which was proved to be effective to predict the pyrolysis reactivity of coal.
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影响因子：
7.4
作者：
Á. Linares-Solano;E. Hippo;P. Walker
通讯作者：
Á. Linares-Solano;E. Hippo;P. Walker
新疆准噶尔盆地准东大煤田煤炭地球化学与矿物学
影响因子：
5.6
作者：
Zhou, Jibin;Zhuang, Xinguo;Li, Jinghong
通讯作者：
Li, Jinghong
影响因子：
5.3
作者：
Le Wu;Y. Qiao;Ben Gui;Chao Wang;Jingying Xu;H. Yao;Minghou Xu
通讯作者：
Le Wu;Y. Qiao;Ben Gui;Chao Wang;Jingying Xu;H. Yao;Minghou Xu
影响因子：
11.4
作者：
Wu, Zhiqiang;Wang, Shuzhong;Meng, Haiyu
通讯作者：
Meng, Haiyu
DOI：
--
发表时间：
2005-08
期刊：
Guang pu xue yu guang pu fen xi = Guang pu
影响因子：
--
作者：
Y. Ju;B. Jiang;Quanlin Hou;Guiliang Wang
通讯作者：
Y. Ju;B. Jiang;Quanlin Hou;Guiliang Wang