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Exploring thermokinetic behaviour of Jurassic coal during pyrolysis and oxidation

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Abstract

The thermokinetics and gaseous products of Jurassic coals collected from northern Shaanxi, China at four different heating rates were determined via thermogravimetry-Fourier transform infrared spectroscopy experiments. The results showed that the trends of thermogravimetric pyrolysis and oxidation curves were divided into three stages and five stages, respectively, and presented the same variations. As the heating rate increased, their curves moved the high temperature. In addition, the characteristic temperatures indicated that the coal samples had a relatively significant spontaneous combustion tendency. In the stage of water evaporation and gas desorption, the rates of formation of CO and CO2 went up promptly, and gaseous water produced during the oxidation reaction began to increase, but its generation rate was lower than that in the stage of oxygen absorption and mass increase. The apparent activation energy (Ea) showed a characteristic jump with increasing temperature, and the optimal mechanism function was chosen by integration and differentiation. Moreover, the relationship between Ea and lnA was linear, which indicated that there was a kinetic compensation effect.

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Acknowledgements

This work was sponsored by National Key R&D Program of China (Grant No. 2018YFC0807900), National Natural Science Foundation of China (No. 51974234), and Shaanxi Province Innovative Talent Promotion Plan-Youth Science, Technology New Star Project (No. 2019KJXX-050).

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Authors and Affiliations

  1. School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an, 710054, Shaanxi, People’s Republic of China

    Caiping Wang, Yanan Hou, Zujin Bai & Jun Deng

  2. Shaanxi Key Laboratory of Prevention and Control of Coal Fire, Xi’an University of Science and Technology, 58, Yanta Mid. Rd, Xi’an, 710054, Shaanxi, People’s Republic of China

    Caiping Wang, Yanan Hou, Zujin Bai & Jun Deng

  3. Center for Loss Prevention and Industrial Disaster Prevention, National Yunlin University and Technology, Douliou, Yunlin, 64002, Taiwan

    Chi-Min Shu

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  1. Caiping Wang
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Correspondence to Zujin Bai or Chi-Min Shu.

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Wang, C., Hou, Y., Bai, Z. et al. Exploring thermokinetic behaviour of Jurassic coal during pyrolysis and oxidation. J Therm Anal Calorim 147, 1439–1453 (2022). https://doi.org/10.1007/s10973-020-10429-z

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  • DOI: https://doi.org/10.1007/s10973-020-10429-z

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