文献类型：期刊文献

英文题名：Mechanism and interaction of alkaline-earth metal migration induced ash transformation and carbon structure evolution for single coal particle high-temperature gasification

作者：Zhang, Haigang[1,2];Shen, Zhongjie[1,2];Liang, Qinfeng[1,2];Liu, Haifeng[1,2]

机构：[1]East China Univ Sci & Technol, Natl Energy Coal Gasificat Technol Res & Dev Ctr, POB 272, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, POB 272, Shanghai 200237, Peoples R China

年份：2024

卷号：495

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20242716599899);WOS:【SCI-EXPANDED(收录号:WOS:001264348200001)】；

基金：Acknowledgements This study is supported by the National Natural Science Foundation of China (22378130 and U23B20170) , the National Key R & D Program of China (2022YFC3902502-04) , the Key R & D Program of Xinjiang Uygur Autonomous Region (2022B03026-1) , the Fundamental Research Funds of the Central Universities (JKB01241715) .

语种：英文

外文关键词：Single coal particle; Gasification; Alkaline-earth metal migration; Ca aggregation; Carbon structure

摘要：The current study focused on alkaline-earth metal migration induced ash transformation and carbon structure evolution for single coal particle high-temperature gasification, with visualization experiments and surface analysis techniques. The alkaline earth metals were found to aggregate to the peripheral reaction surface, while the rest remained in the initial scattered distribution. A migration index was defined and reached an extreme value in the middle reaction stage and increased with temperature, especially for the Ca element and followed by Mg. Raman spectra show the aggregation of Ca on the particle surface disrupted the carbon structure, leading to an increase in the disordered carbon content and improving the char reactivity. The aggregation behavior led to mineral transformation and melting to a liquid slag layer on the particle surface as a eutectic. Finally, a mechanism of the aggregation behavior of ionic Ca on a single particle scale was proposed in this study.