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Thermal analysis and kinetics of coal during oxy-fuel combustion

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Abstract

The pyrolysis and oxy-fuel combustion characteristics of Polish bituminous coal were studied using non-isothermal thermogravimetric analysis. Pyrolysis tests showed that the mass loss profiles were almost similar up to 870°C in both N2 and CO2 atmospheres, while further mass loss occurred in CO2 atmosphere at higher temperatures due to char-CO2 gasification. Replacement of N2 in the combustion environment by CO2 delayed the combustion of bituminous coal. At elevated oxygen levels, TG/DTG profiles shifted through lower temperature zone, ignition and burnout temperatures decreased and mass loss rate significantly increased and complete combustion was achieved at lower temperatures and shorter times. Kinetic analysis for the tested coal was performed using Kissinger-Akahira-Sunose (KAS) method. The activation energies of bituminous coal combustion at the similar oxygen content in oxy-fuel with that of air were higher than that in air atmosphere. The results indicated that, with O2 concentration increasing, the activation energies decreased.

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Acknowledgments

This work was financially supported by the National Science Centre (Poland) under grant No. N N512 457940 and the Ministry of Science and Higher Education (Poland) under the statutory funds (BS-1-103-3020/2016). The support is gratefully acknowledged.

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Authors and Affiliations

  1. Institute of Thermal Machinery, Czestochowa University of Technology, Armii Krajowej 21, 42-201, Czestochowa, Poland

    Monika Kosowska-Golachowska

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  1. Monika Kosowska-Golachowska
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Kosowska-Golachowska, M. Thermal analysis and kinetics of coal during oxy-fuel combustion. J. Therm. Sci. 26, 355–361 (2017). https://doi.org/10.1007/s11630-017-0949-0

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  • DOI: https://doi.org/10.1007/s11630-017-0949-0

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