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TG-FTIR study on co-combustion of bituminous coal semicoke and lignite

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Abstract

The combustion behaviors and pollutants emission characteristics during co-combustion of bituminous coal semicoke and lignite were investigated by thermogravimetric analyzer coupled with Fourier transform infrared spectrometer (TG-FTIR). Results showed the addition of lignite could lower the ignition and burnout temperature and also enhance the comprehensive combustion performance of blends. High heating rate could improve the combustion intensity and corresponding combustion characteristic indexes. The activation energy analysis by distributed activation energy model (DAEM) and Ozawa–Flynn–Wall (OFW) methods at lignite blend ratio of 40% indicated its distribution was consistent with the combustion process of blends. An obvious activation energy jump occurred at conversion rate range of 0.4–0.55 due to the poor ignition performance of semicoke. The average activation energy obtained by DAEM and OFW methods was 101.69 kJ mol−1 and 109.12 kJ mol−1, respectively. With the increase of lignite blend ratios, CO and CO2 emission gradually decreased. Meanwhile, NO emission increased, while NO2 and SO2 emission ascended after an initial decline. Semicoke had certain suppression effect on NOx and SO2 emission. The minimum NO2 and SO2 emission was obtained at lignite blend ratio of 20%.

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Acknowledgements

This work was supported by the National Key R&D Program of China (Grant No. 2017YFB0602003), National Natural Science Foundation of China (Grant No.U1610254) and Director Innovation Fund of Key Laboratory of Biofuels Chinese academy of Science (Grant No. Y372081100).

Funding

This study was funded by National Key R&D Program of China (Grant No. 2017YFB0602003), National Natural Science Foundation of China (Grant No.U1610254) and Director Innovation Fund of Key Laboratory of Biofuels Chinese academy of Science (Grant No. Y372081100).

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Authors and Affiliations

  1. Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China

    Ruidong Zhao, Jianguang Qin, Tianju Chen & Jinhu Wu

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  1. Ruidong Zhao
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  2. Jianguang Qin
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  3. Tianju Chen
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  4. Jinhu Wu
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Ruidong Zhao, Jianguang Qin and Tianju Chen. The first draft of the manuscript was written by Ruidong Zhao, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Ruidong Zhao or Jinhu Wu.

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Zhao, R., Qin, J., Chen, T. et al. TG-FTIR study on co-combustion of bituminous coal semicoke and lignite. J Therm Anal Calorim 147, 1849–1858 (2022). https://doi.org/10.1007/s10973-020-10405-7

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