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

YAN Zheng-hao; HE Run-xia; WANG Dan-dan; BAN Yan-peng; SONG Yin-min; LI Na; LIU Quan-sheng

Volume 47 Issue 4

Apr. 2019

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Article Navigation > Journal of Fuel Chemistry and Technology > 2019 > 47(4): 411-418

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.

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.

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.

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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

Funds:

the National Natural Science Foundation of China 21566028

the National Natural Science Foundation of China 21676149

More Information

Corresponding author: HE Run-xia, E-mail: runxiahe@imut.edu.cn; LIU Quan-sheng, E-mail:liuqs@imut.edu.cn
Received Date: 2018-11-12
Rev Recd Date: 2019-01-31

Available Online: 2021-01-23

Publish Date: 2019-04-10

Abstract

Abstract

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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