Citation: LI Hai-jie, LI Xiao-hong, FENG Jie, LI Wen-ying. Effect of preheating treatment on oxygen migration during lignite pyrolysis[J]. Journal of Fuel Chemistry and Technology, ;2019, 47(1): 1-7. shu

Effect of preheating treatment on oxygen migration during lignite pyrolysis

Training Base of State Key Laboratory of Coal Science and Technology Jointly Constructed by Shanxi Province and Ministry of Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China

Corresponding author: FENG Jie, fengjie@tyut.edu.cn
Received Date: 9 August 2018
Revised Date: 1 October 2018

Fund Project: the National Natural Science Foundation Youth Project 21706174Key Projects supported by the National Natural Science Foundation of China U1361202The project was supported by the National Key Research and Development Program of China (2016YFB0600305) and Key Projects supported by the National Natural Science Foundation of China (U1610221, U1361202) and the National Natural Science Foundation Youth Project (21706174)the National Key Research and Development Program of China 2016YFB0600305Key Projects supported by the National Natural Science Foundation of China U1610221

Figures(9)

The effect of preheating treatment (140-230 ℃) on the oxygen migration rule of Hulunbuir lignite which is pyrolyzed at 650 ℃ has been discussed by using the proximate and ultimate analyses, the Fourier transform-infrared spectroscopy, and the gas chromatography-mass spectrometry analysis. Results show that the amount of oxygen migrated to the pyrolysis water and semi-coke is decreased by 7.55% and 1.43%, respectively due to the effect of preheating at 200 ℃. Furthermore, the amount of oxygen transferred to tar and gas is increased by 6.66% and 1.61% respectively, and phenolic oxygen in tar is getting doubled. The decrease of hydrogen bonding and the increase of phenolic compounds are noted as the result of preheating process of lignite, as evidenced by in-situ infrared diffuse reflectance spectroscopy, this could be due to the dissociation of OH…π, OH…N bonds. Hydroxyl self-association hydrogen bonds have also broken down and transformed during the preheating process with the formation of free OH·, which result in the increase of phenol and cresol contents.
- preheating treatment,
- lignite,
- pyrolysis,
- oxygen migration,
- hydrogen bond
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