文献类型：期刊文献

英文题名：CO2 gasification of char from raw and torrefied biomass: Reactivity, kinetics and mechanism analysis

作者：He, Qing[1];Guo, Qinghua[1];Ding, Lu[3];Wei, Juntao[1];Yu, Guangsuo[1,2]

机构：[1]East China Univ Sci & Technol, Inst Clean Coal Technol, Shanghai 200237, Peoples R China;[2]Ningxia Univ, State Key Lab High Efficiency Coal Utilizat & Gre, Yinchuan 750021, Peoples R China;[3]Tokyo Inst Technol, Dept Environm Sci & Technol, Midori Ku, 4259 Nagatsuta Cho, Yokohama, Kanagawa 2268503, Japan

年份：2019

卷号：293

外文期刊名：BIORESOURCE TECHNOLOGY

收录：;EI(收录号：20193607401193);WOS:【SCI-EXPANDED(收录号:WOS:000487836600076)】；

基金：This work was supported by National Natural Science Foundation of China (21878093).

语种：英文

外文关键词：Torrefaction; Gasification; Pyrolysis; Kinetics; Biomass char

摘要：In this study, the effect of torrefaction on the gasification reactivity of chars from raw and torrefied biomass was investigated. Three torrefaction temperatures and four pyrolysis temperatures were taken into consideration. It was found that the severe torrefaction (300 degrees C) would reduce the char gasification reactivity by at least 19% according to the normalized gasification rate. Moreover, the reduction of gasification reactivity appeared after the midterm stage. The gasification reaction were further analyzed by nucleation/growth model and model-free method. The activation energy increased by similar to 80 kJ/mol with conversion, indicating an enhancement of the reaction resistance. Furthermore, 800 degrees C pyrolysis was found to be a turning point, beyond which the gasification reactivity reduced significantly. These reactivity changes were implied by the bio-char structure evolution and active alkali and alkaline earth metals (AAEMs) contents variations. The research results provide insights into the effect of torrefaction on biomass gasification.