文献类型：期刊文献

英文题名：Studying effects of solid structure evolution on gasification reactivity of coal chars by in-situ Raman spectroscopy

作者：Yu, Junqin[1];Guo, Qinghua[1];Ding, Lu[1,2];Gong, Yan[1];Yu, Guangsuo[1,3]

机构：[1]East China Univ Sci & Technol, Inst Clean Coal Technol, Shanghai 200237, Peoples R China;[2]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China;[3]Ningxia Univ, State Key Lab High Efficiency Coal Utilizat & Gre, Yinchuan 750021, Ningxia, Peoples R China

年份：2020

卷号：270

外文期刊名：FUEL

收录：;EI(收录号：20201108295898);WOS:【SCI-EXPANDED(收录号:WOS:000520029100065)】；

基金：This work was supported by the National Natural Science Foundation of China (21878093) and National Key R&D Program of China (2017YFB0602601).

语种：英文

外文关键词：Coal gasification; In-situ Raman spectroscopy; Structure evolution; Gasification reactivity

摘要：This study focuses on characteristics of structure evolution during pyrolysis and subsequent char gasification of lignite and bituminous coal. Coal pyrolysis was conducted on induction-heating reactor. As pyrolysis temperature increased, the graphitization degree of char increased, and the amount of C-O and -CH in char decreased, resulting in poorer gasification reactivity of char. Char gasification was conducted by thermogravimetric analyzer (TGA), high-temperature stage microscope (HTSM) and in-situ Raman system to investigate gasification reactivity, in-situ evolution of morphology structure and in-situ evolution of carbon structure, respectively. As gasification proceeded, the projected area of char particle decreased rapidly first and then kept consistent, and degree of graphitization of char gradually increased. In-situ Raman parameters indicated difference in increasing rate of graphitization between lignite char and bituminous char decreased with increasing temperature. Higher temperature deactivated the alkali metals, leading to attenuation of their inhibitory effect on graphitization. Gasification reactivity index R-0.9 was in positively correlated with in-situ ID1/IG value, and corresponding correlation coefficient (R-2) for TGA and HTSM were 0.8108 and 0.9829, respectively. The higher R-2 for HTSM was due to the weaker diffusion effect. In-situ Raman parameter was more suitable for predicting gasification reactivity of single particle char.