文献类型：期刊文献

英文题名：Upgrading Effects of Supercritical Carbon Dioxide Extraction on Physicochemical Characteristics of Chinese Low-Rank Coals

作者：Li, Hongjun[1,2];Chang, Qinghua[1,2];Dai, Zhenghua[1,2];Chen, Xueli[1,2];Yu, Guangsuo[1,2];Wang, Fuchen[1,2]

机构：[1]East China Univ Sci & Technol, Key Lab Coal Gasifict & Energy Chem Engn, Minist Educ, POB 272,130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Engn Res Ctr Coal Gasificat Shanghai, POB 272,130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2017

卷号：31

期号：12

起止页码：13305

外文期刊名：ENERGY & FUELS

收录：;EI(收录号：20175204585418);WOS:【SCI-EXPANDED(收录号:WOS:000418783800022)】；

基金：This work has been supported by the National Natural Science Foundation of China (21376079 and 21376081).

语种：英文

外文关键词：Fourier transform infrared spectroscopy - Bituminous coal - Thermogravimetric analysis - Supercritical fluid extraction - Carbon dioxide - Coal combustion

摘要：The effects of supercritical carbon dioxide (SCCO2) extraction on coal composition, coal rank, pore structure, and combustion reactivity of three typical Chinese low-rank coals (LRCs) were investigated in this study. The results show that the SCCO2 extraction process has significantly reduced the moisture content and increased the fixed carbon content of LRCs. The oxygen/carbon atomic ratio of upgraded LRCs decreases, indicating that the coal rank of upgraded LRCs improves after SCCO2 extraction, which is consistent to the findings from Fourier transform infrared spectroscopy. The specific surface area and total pore volume of upgraded Hu Lun Bei Er (HLBE) and Zhao Tong (ZT) lignite increase significantly with extraction time and temperature. Thermogravimetric analysis shows that the combustion process of upgraded LRCs is moving toward the high temperature region and its burnout temperature (T-b) increases. The average reactivity rate (k(mean)), maximum reactivity rate (k(max)), and comprehensive reactivity parameter (S) increase obviously for upgraded HLBE and ZT lignite, whereas they decrease slightly for upgraded Xin Jiang sub-bituminous coal, indicating that the combustion reactivity of upgraded lignite is enhanced by the SCCO2 extraction process.