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Experimental study on interaction and kinetic characteristics during combustion of blended coals

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Abstract

The combustion behaviors and kinetic parameters of three parent coals (A1, A2, and A3) and their blends (A1/A2 and A2/A3) have been evaluated under oxidizing atmosphere (O2 and N2 mixtures), using a non-isothermal thermo-gravimetric analyzer. The aim of this study is to investigate the interaction between the blended components during the process of co-combustion, and the effects of blending ratio and oxygen concentration (10, 15, and 21%) on combustion performance of blended coals. When high reactivity and low reactivity coals are co-combusted, double peaks are observed in the DTG curves, and significant interaction occurs in the temperature range between the two peaks (T p1 and T p2). The activation energies obtained by Coats–Redfern method indicate that the activation energies of blended coals are lower than that of parent coals. The combustibility index S is used to evaluate the combustion performance of blended coals, and the results show the non-additive effects of the combustion characteristics of blended coals. The increased oxygen concentration results in a significant improvement of combustion performance of blended coals. In addition, as the blending ratio of high reactivity coal is increased, the oxygen can greatly enhance the combustion stability of blended coals.

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Acknowledgements

The financial supports from National Natural Science Foundation of China (50676076) are gratefully acknowledged.

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Authors and Affiliations

  1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an, 710049, China

    Xiaoming Zhang, Yinhe Liu, Chang’an Wang & Defu Che

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  1. Xiaoming Zhang
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  2. Yinhe Liu
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  3. Chang’an Wang
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  4. Defu Che
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Correspondence to Defu Che.

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Zhang, X., Liu, Y., Wang, C. et al. Experimental study on interaction and kinetic characteristics during combustion of blended coals. J Therm Anal Calorim 107, 935–942 (2012). https://doi.org/10.1007/s10973-011-1657-8

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  • DOI: https://doi.org/10.1007/s10973-011-1657-8

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