Citation: YAN Zheng-hao, HE Run-xia, WANG Dan-dan, BAN Yan-peng, SONG Yin-min, LI Na, LIU Quan-sheng. Study on the transformation characteristics of microstructure in Shengli lignite during low-temperature oxidation[J]. Journal of Fuel Chemistry and Technology, ;2019, 47(4): 411-418. shu

Study on the transformation characteristics of microstructure in Shengli lignite during low-temperature oxidation

College of Chemical Engineering, Inner Mongolia University of Technolegy, Inner Mongolia Key Laboratory of High-Value Funtional Utilization of Low Rank Carbon Resources, Huhhot 010051, China

Corresponding author: HE Run-xia, runxiahe@imut.edu.cn LIU Quan-sheng, liuqs@imut.edu.cn
Received Date: 12 November 2018
Revised Date: 31 January 2019

Fund Project: the National Natural Science Foundation of China 21676149the National Natural Science Foundation of China 21566028The project was supported by the National Natural Science Foundation of China(21566028, 21676149) and Major Basic Research Open Programs of Inner Mongolia and Program on Scientific Research Project of Inner Mongolia

Figures(7)

A Shengli lignite from Inner Mongolia was selected as the research object, with which the low-temperature oxidation experiments were carried out at different temperatures (200-300℃) in a fixed bed reactor. The structure of coal samples after oxidation treatment was characterized by FT-IR, Raman and XPS. The effects of low-temperature oxidation at different temperatures on the microstructure and mass change of lignite were investigated and the combustion performance was determined by TGA. The results show that the temperature has a significant influence on mass change rate of Shengli lignite during low-temperature oxidation. The mass change rate of lignite is very limited when temperature is below 220℃ and it changes obviously when the temperature is higher than 220℃. Especially at 220-230℃, the mass change rate of coal samples is changed from 5.80% (220℃) to 42.55% (230℃). The FT-IR/Raman/XPS characterization results show that the analogous benzoquinone structure forms after oxidized at 220℃, and these lead to the stretching vibration absorption peak of the aromatic C=C shift to lower wavenumber. In Raman spectra, the position of the D peak shifts, and the distance between the peaks of D and G increases. The content of C-O-and C=O on the surface of coal samples increases at oxidation temperature lower than 220℃. It is speculated that the jump of mass change rate of coal samples at 220-230℃ is mainly related to the oxidative decomposition of analogous benzoquinone structure.
- Shengli lignite,
- low-temperature oxidation,
- microstructure,
- transformation characteristics,
- mass change rate
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