文献类型：期刊文献

英文题名：Effects of CO2 on coal rapid pyrolysis behavior and chemical structure evolution

作者：Chang, Qinghua[1];Gao, Rui[1];Li, Hongjun[1];Dai, Zhenghua[1];Yu, Guangsuo[1];Liu, Xia[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：2017

卷号：128

起止页码：370

外文期刊名：JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS

收录：;EI(收录号：20174504370257);WOS:【SCI-EXPANDED(收录号:WOS:000417657600042)】；

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：Coal pyrolysis; CO2; Char structure; FT-IR; Oxy-fuel combustion

摘要：Rapid pyrolysis of Shenfu bituminous coal was conducted with a wall temperature 1073-1473 K and residence time 0-750 ms in both CO2 and N-2 atmospheres to study the pyrolysis mechanism in CO2 atmosphere. The interest was focused on mass loss, gas yield, element content of chars and a series of chemical structure parameters (CH2/CH3, Har/H, fa and (R/C).) obtained by FT-IR analyses. The results show that varied impacts dominated on pyrolysis at different temperatures in CO2 atmosphere. Mass loss decreased at 1073 K but increased at 1273 and 1473 K. Both heterogeneous reaction of CO2 with char and homogeneous reactions of CO2 with volatile occurred during pyrolysis in CO2 atmosphere. The combined effect of enhanced polycondensation of aromatic rings and C-CO2 reaction has been found to increase the mass loss of char. More H-containing free radicals generated during polycondensation, which consequenctly increase combination possibility with other radical fragments to inhibit the cross-linking reaction.