文献类型：期刊文献

英文题名：Effects of thermal dissolution in different solvents on structural characteristics and pyrolysis behaviors of lignite

作者：Li, Yanling[1];Huang, Sheng[1,2];Wu, Youqing[1,2];Wu, Shiyong[1,2];Gao, Jinsheng[1,2]

机构：[1]East China Univ Sci & Technol, Dept Chem Engn Energy Resources, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Minist Educ, Key Lab Coal Gasificat & Energy Chem Engn, Shanghai 200237, Peoples R China

年份：2019

卷号：241

起止页码：550

外文期刊名：FUEL

收录：;EI(收录号：20185106280136);WOS:【SCI-EXPANDED(收录号:WOS:000458760500055)】；

基金：We gratefully acknowledge financial support of this work by the National Natural Science Foundation of China (Grant No. 21506060) and the Fundamental Research Funds for the Central Universities (Grant No. 222201718003). The authors would like to thank Jiashu Qian for her enthusiastic help in detection and correction of this paper.

语种：英文

外文关键词：Lignite; Thermal dissolution; Pyrolysis; Low molecular weight compounds

摘要：Thermal dissolution (TD) of Xilinhaote lignite (XL) in n-hexane, toluene and methanol were carried out, and then the residues of thermal dissolution (RTDs) and XL were pyrolyzed at a low temperature of 550 degrees C to explore the effect of TD on structural characteristics and pyrolysis behaviors of XL. Results show that RTDs present higher aromatic carbon content (fa), lower aliphatic carbon (f(al)) and oxygen-linked carbon content (f(O)), indicating that the molecular structure of XL becomes more ordered after TD, especially that in n-hexane. Among three RTDs, the RTD in methanol obtained at 290 degrees C (RTDM,290) exhibits the largest aromatic cluster size. The influences of TD at 290 degrees C on the pyrolysis behaviors of XL are remarkable. Compared with XL, the pyrolysis of RTDs obtained at 290 degrees C (RTD(290)s) present higher char yields, lower tar, gas and water yields. The pyrolysis of RTD in n-hexane obtained at 290 degrees C (RTDH,290) exhibits extremely low tar yield, suggesting that the low molecular weight compounds (LMWCs) isolated from XL during TD can transport into tar and/or act as hydrogen donors to stabilize the radical fragments during pyrolysis processes. Although the methanol soluble portion (SP) yield is up to 9.45% at 290 degrees C, the tar yield of RTDM,290 is almost equal to that of XL, indicating that the swelling effect of XL in methanol is significant and it is conducive to the production of tar.