The structure and pyrolysis product distribution of lignite from different sedimentary environment
The structure and pyrolysis product distribution of lignite from different sedimentary environment
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DOI：
10.1016/j.apenergy.2015.10.166
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发表时间：
2016-02-01
期刊：
影响因子：
11.2
通讯作者：
Lu, Xilan
中科院分区：
文献类型：
--
作者：
Liu, Peng;Zhang, Dexiang;Lu, Xilan
褐煤低温热解是获得煤焦油和提高其燃烧热值的一种经济有效的方法。热解产物分布（特别是煤焦油产率）的研究对当前和未来的能源利用和经济发展具有重要意义。在管式反应器中，于873 K热解15 min，利用固体碳13核磁共振（NMR）和傅里叶变换红外光谱（FTIR）对褐煤进行结构表征。采用热重分析仪（TG）进行热分析。结果表明，不同沉积环境的褐煤热解产物分布与芳环分支结构的断裂有关。气体的产率和组成与羰基的分解和脂肪碳的断裂有关。褐煤热解焦油产率依次为：先锋褐煤（XF，13.67wt%）>小龙潭褐煤（XLT，7.97 wt.%）>内蒙古褐煤（IM，6.30重量%），主要受褐煤中脂肪碳含量、CH_2/H_3比和含氧官能团的影响。热解产水量取决于氧官能团的分解。IM具有最高含量的氧连接碳，使得源自IM的热解水产率最高（9.20重量%），远高于其他两种褐煤。(C)2015爱思唯尔有限公司版权所有。
Low-temperature pyrolysis is an economically efficient method for lignite to obtain coal tar and improve its combustion calorific value. The research on the distribution of pyrolysis product (especially coal tar yield) plays an important role in energy application and economic development in the now and future. Pyrolysis test was carried out in a tube reactor at 873 K for 15 min. The structure of the lignite was measured by solid C-13 nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FTIR). The thermal analysis was analyzed by thermo-gravimetric (TG) analyzer. The results show that the pyrolysis product distribution is related to the breakage of branch structures of aromatic ring in lignites from different sedimentary environment. The gas yield and composition are related to the decomposition of carbonyl group and the breakage of aliphatic carbon. The tar yield derived from lignite pyrolysis follows the order: Xianfeng lignite (XF, 13.67 wt.%) > Xiaolongtan lignite (XLT, 7.97 wt.%) > Inner Mongolia lignite (IM, 6.30 wt.%), which is mainly influenced by the aliphatic carbon contents, the CH2/H-3 ratio and the oxygen functional groups in lignite. The pyrolysis water yield depends on the decomposition of oxygen functional groups. IM has the highest content of oxygen-linked carbon so that the pyrolysis water yield derived from IM is the highest (9.20 wt.%), and is far more than that from the other two lignites. (C) 2015 Elsevier Ltd. All rights reserved.