文献类型：期刊文献

英文题名：Experimental study on the effect of temperature and oxygen on pyrolysis-gasification decoupling characteristics of Yili coal

作者：Zhang, Haigang;Shen, Zhongjie[1];Dong, Zizheng;Yang, Yiru;Xu, Jianliang;Liang, Qinfeng;Liu, Haifeng

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

年份：2023

卷号：172

外文期刊名：JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS

收录：;EI(收录号：20232014088742);WOS:【SCI-EXPANDED(收录号:WOS:001005856800001)】；

基金：This study is supported by the National Key R & D Program of China (2022YFC3902502-04) , the Shanghai Pujiang Program (21PJ1402300) , the Fundamental Research Funds of the Central Universities (JKB01211715 and JKB01221677) .

语种：英文

外文关键词：Pyrolysis; Gasification; Decoupling; Gas component regulation; Char reactivity

摘要：Pyrolysis, as the initial process of coal clean utilization, is essential to ensure the operation of pyrolysisgasification decoupling technology. This paper aims to investigate the effects of temperature and oxygen content on coal pyrolysis product distribution and the char structure and reactive properties. Results demonstrate that in the range of 800-1100 degrees C, the increase in temperature is conducive to the release of volatiles and tar cracking, to enhance the gas phase yield and syngas concentration. However, as Raman spectroscopy analysis shows, higher temperature (>900 degrees C) will intensify the graphitization of char, which is not conducive to the next gasification step. In addition, oxygen introduction at 900 degrees C can accelerate the release of volatiles and intensify the occurrence of depolymerization reaction, which increased the gas yields of CO and CO2 in the gaseous product. Besides, the presence of trace oxygen in the pyrolysis process reduces the degree of coal char graphitization and improves the gasification reactivity. However, at high oxygen content (8 %) conditions, combustion occurs on the surface of the char as SEM results show, which destroys the structure and reduces the gasification activity of the char. Hence, the pyrolysis product distribution and post-pyrolysis char gasification activity can be adjusted by introducing trace oxygen in pyrolysis-gasification decoupling technology.