Abstract
Pyrolysis kinetic analysis of forest combustible material plays an important role in modeling wildland fire. For the kinetic analysis method by using optimization calculations, there is a lack of a reliable method to determine the search ranges of the parameters. This work presents an effort for this problem, for which we propose a comprehensive method by the combined use of the Kissinger method, the model-free methods and a two-point method. For the comprehensive method, the Kissinger method is used to preliminarily evaluate the activation energy of the reaction steps corresponding to the DTG peaks, the model-free methods are used to compare the activation energy values for different pseudo-components, while the two-point method is used to preliminarily evaluate the lower limits of activation energy and pre-exponential factor for the first reaction step. By using this comprehensive method, reasonable search ranges of the activation energy and pre-exponential factor can be determined for optimization calculations. The thermogravimetric experimental data of pine bark at heating rates of 10, 15, 20, and 25 K/min under nitrogen atmosphere are used to check the reliability of the comprehensive method. The genetic algorithm (GA) method is used for optimization calculations. The results show that by the comprehensive method, the GA calculation performs more efficiently than the calculation by using blind range. In addition, if a part of the parameter range is improper, the search range can be further narrowed based on the comprehensive method.
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Abbreviations
- A :
-
Frequency factor (1/min)
- E :
-
Activation energy (kJ/mol)
- \(f(\alpha )\) :
-
Mechanism function
- m :
-
Sample mass (mg)
- n :
-
Reaction order
- r :
-
Contribution coefficient
- R :
-
Gas constant
- t :
-
Time (min)
- T :
-
Absolute temperature (K)
- \(\alpha\) :
-
Conversion fraction
- \(\beta\) :
-
Heating rate (K/min)
- \(0\) :
-
Initial value
- \(\infty\) :
-
Final value
- \({\text{acc}}\) :
-
Initially accelerate
- i :
-
Number of components
- j :
-
Number of experimental runs
- k :
-
Number of data points in each run
- p :
-
DTG peak
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Acknowledgements
This research is funded by the National Key Research and Development Plan (No. 2016YFC0800100) and the National Natural Science Foundation of China (No. 51625602). This work has also been supported by the USTC Fundamental Research Funds (Nos. WK2320000038 and WK2320000036).
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Zhu, H., Liu, N. (2020). Pyrolysis Kinetic Analysis of Forest Combustible Material: An Improved Method for Optimization Calculation. In: Wu, GY., Tsai, KC., Chow, W.K. (eds) The Proceedings of 11th Asia-Oceania Symposium on Fire Science and Technology. AOSFST 2018. Springer, Singapore. https://doi.org/10.1007/978-981-32-9139-3_45
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DOI: https://doi.org/10.1007/978-981-32-9139-3_45
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