文献类型：期刊文献

英文题名：Variation of the coal chemical structure and determination of the char molecular size at the early stage of rapid pyrolysis

作者：Cui, Tongmin[1];Fan, Wenke[1];Dai, Zhenghua[1];Guo, Qinghua[1];Yu, Guangsuo[1];Wang, Fuchen[1]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, Minist Educ, Key Lab Coal Gasificat & Energy Chem Engn, Shanghai 200237, Peoples R China

年份：2016

卷号：179

起止页码：650

外文期刊名：APPLIED ENERGY

收录：;EI(收录号：20162902619055);WOS:【SCI-EXPANDED(收录号:WOS:000383291800053)】；

基金：This work was supported by the National Natural Science Foundations of China (21376079 and 21376081).

语种：英文

外文关键词：Rapid pyrolysis; Char; Chemical structure; Molecular size

摘要：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.