Effects of Vitrinite in Low-Rank Coal on the Structure and Combustion Reactivity of Pyrolysis Chars

热解 反应性(心理学) 燃烧 秩(图论) 煤级 镜质组 化学 有机化学 数学 医学 组合数学 病理 替代医学
作者
Yanmei Xu,Qingyun Fu,Yingmin Hong,Ying Zhang,Liang Wang,Ke Bei,I‐Ming Chou,Haoquan Hu,Zhiyan Pan
出处
期刊:ACS omega [American Chemical Society]
卷期号:5 (28): 17314-17323 被引量:15
标识
DOI:10.1021/acsomega.0c01542
摘要

Pyrolysis is a highly promising technology for the efficient utilization of low-rank coal. The structure of coal plays an important role in its utilization. In this paper, the evolution of the char structure during heat treatment (200–800 °C) of Naomaohu coal and its different vitrinite-rich fractions was studied. The functional group structure, aromatic ring structure, and crystallite size of chars were determined by Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, and X-ray diffraction (XRD) spectroscopy, respectively. The results indicated that minerals inhibit the condensation reaction of aromatic rings during pyrolysis. The high vitrinite content in coal is conducive to the formation of larger char crystallite average sizes (La). The relationship between La (1.69–3.10 nm) and the Raman band area ratio A(GR+VL+VR)/AD or AD/Aall was established. In addition, the combustion performance and kinetics of chars were also investigated. The results showed that the char from high contents of the liptinite fraction has lower combustion reactivity, and demineralization treatment has significantly reduced the combustion reactivity of char.

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