Variation of the coal chemical structure and determination of the char molecular size at the early stage of rapid pyrolysis
Variation of the coal chemical structure and determination of the char molecular size at the early stage of rapid pyrolysis
复制标题
快速热解初期煤化学结构的变化及焦分子尺寸的测定
DOI：
10.1016/j.apenergy.2016.06.143
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发表时间：
2016-10-01
期刊：
影响因子：
11.2
通讯作者：
Wang, Fuchen
中科院分区：
文献类型：
--
作者：
Cui, Tongmin;Fan, Wenke;Wang, Fuchen
通过对褐煤、烟煤和无烟煤的快速热解（近似10（4）K/s）实验，研究了热过程对煤结构的影响。重点研究了热解初期（0-500 ms）和高温（1173-1773 K）时热解产物的化学结构变化，包括质量损失率、挥发分含量、元素含量和有机基团等。用一系列参数表征了其化学结构、CH 2/CH 3比、芳氢分数和芳香度（f（a））。基于环缩合度（R/C）（u）和芳香族单体的当量直径（D-C）来确定半焦的分子尺寸。这一结果表明，这五个化学结构参数（CSPs）的增加与热解时间和温度。三种煤种的对比表明，褐煤的煤样中硫含量比烟煤和无烟煤低，且增加快。(C)2016爱思唯尔有限公司版权所有
Rapid pyrolysis (similar to 10(4) K/s) experiments investigating lignite, bituminous coal and anthracite were conducted to study the effect of the thermal process on the coal structure. The interest was focused on the chemical structure variation occurring at the early stage of pyrolysis (0-500 ms) and high temperature (1173-1773 K), which includes the mass loss ratio, volatile content, element content and organic groups. A series of parameters was used to characterize the chemical structure, CH2/CH3 ratio, fraction of aromatic hydrogen and aromaticity (f(a)). The char's molecular size was determined based on both ring condensation degree (R/C)(u) and equivalent diameter of the aromatic monomer (D-C). This result demonstrated that these five chemical structural parameters (CSPs) increase with the pyrolysis time and temperature. The comparison of three types of coals reveals that the CSPs of lignite are lower and increase faster than those of bituminous coal and anthracite. (C) 2016 Elsevier Ltd. All rights reserved.