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Error evaluation on pyrolysis kinetics of sawdust using iso-conversional methods

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Abstract

Pyrolysis behavior and kinetic properties of sawdust with the heating rates (β) of 5, 10, 15 and 20 °C min−1 in nitrogen atmosphere were analyzed by using a thermogravimetric analyzer. The results showed that organics of sawdust mainly decomposed at 250–400 °C, and greater heating rate can move the peak of differential thermogravimetric curves toward higher temperature. Two iso-conversional methods, Flynn–Wall–Ozawa (FWO) method and Kissinger–Akahira–Sunose (KAS) method, were employed to analyze the non-isothermal pyrolysis kinetics of sawdust, and the range of apparent activation energies for sawdust pyrolysis is between 101.53 and 114.83 kJ mol−1 using FWO method and is between 95.94 and 114.87 kJ mol−1 using KAS method. Error limit from heating rate was first proposed to examine the reliability of two iso-conversional methods, and the error from heating rate cannot exceed the range of ±20 kJ mol−1 in this study. Overall, these results suggested that the experimental results and kinetic parameters provided useful information for the design of pyrolytic processing system using sawdust as feedstock, and error limits demonstrated the precision of these obtained apparent activation energies.

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Acknowledgements

These authors were supported by the Youth Top–notch Talent Support Program of the Central Organization Department (51522603).

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Authors and Affiliations

  1. State Key Laboratory of Coal Combustion, HuazhongUniversity of Science and Technology, Wuhan, 430074, People’s Republic of China

    Jinxing Wang & Haibo Zhao

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  1. Jinxing Wang
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  2. Haibo Zhao
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Correspondence to Haibo Zhao.

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Wang, J., Zhao, H. Error evaluation on pyrolysis kinetics of sawdust using iso-conversional methods. J Therm Anal Calorim 124, 1635–1640 (2016). https://doi.org/10.1007/s10973-016-5308-y

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  • DOI: https://doi.org/10.1007/s10973-016-5308-y

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