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Deoxygenation of Chinese long-flame coal in low-temperature pyrolysis

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Abstract

Long-flame coal is a typical low-ranked coal that is not fully utilized and has a huge global reserve. High-content oxygen is a significant negative factor for low-rank coal utilization. The TG–FTIR–GC/MS method was applied to investigate the migration behavior of oxygen and the variation in the properties of Chinese long-flame coal during low-temperature pyrolysis. It was found that the oxygen migration ratios in long-flame coal toward gas and tar were 47.7 and 5.2%, respectively, at 550 °C, that the initial oxygen migration temperatures of hydroxyl, carboxyl, carbonyl and ether bonds were 500, 200, 300 and 350 °C, respectively, that the decomposition rates were 8.2, 90, 99.2 and 86% at 550 °C, respectively, that the oxygen in gas existed mainly in the form of CO2 and CO, and that the oxygen in tar existed mainly in the form of phenolic compounds. The further removal of oxygen was due to the decomposition of hydroxyl and a small amount of stable ether bonds. Furthermore, deoxygenation suggested that the decrease in oxygen had a positive effect on coal liquefaction and resulted in a decrease in its hydrophilicity.

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Acknowledgements

Financial support by from the National Key R&D Program (Project No. 2016YFB0601501) is gratefully acknowledged. The authors also thank for the suggestion of Dr. Sen Li on this work.

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Authors and Affiliations

  1. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan, 063210, Hebei, People’s Republic of China

    Zibing Wang & Running Kang

  2. School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing, 102206, People’s Republic of China

    Chao Wang

  3. State Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China

    Running Kang, Feng Bin & Xiaolin Wei

  4. School of Engineering Science, University of Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China

    Xiaolin Wei

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  1. Zibing Wang
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  2. Chao Wang
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  4. Feng Bin
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  5. Xiaolin Wei
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Correspondence to Xiaolin Wei.

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Wang, Z., Wang, C., Kang, R. et al. Deoxygenation of Chinese long-flame coal in low-temperature pyrolysis. J Therm Anal Calorim 131, 3025–3033 (2018). https://doi.org/10.1007/s10973-017-6753-y

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  • DOI: https://doi.org/10.1007/s10973-017-6753-y

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