Pyrolysis Kinetic Modelling of Wheat Straw from the Pannonian Region

The pyrolysis/devolatilization is a basic step of thermochemical processes and requires fundamental characterization. In this paper, the kinetic model of pyrolysis is specified as a one-step global reaction. This type of reaction is used to describe the thermal degradation of wheat straw samples by...

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Bibliographic Details
Published in:Journal of Combustion 2016-01, Vol.2016 (2016), p.221-230
Main Authors: Pesenjanski, Ivan, Miljkovic, Biljana, Vicevic, Marija
Format: Article
Language:English
Subjects:
Analysis
Approximation
Atoms & subatomic particles
Biomass
Cellulose
Chemical properties
Chemical reactions
Decomposition
Devolatilization
Heat
Heating rate
Investigations
Mathematical analysis
Mathematical models
Observations
Potassium
Pyrolysis
Straw
Thermal properties
Wheat
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Summary:The pyrolysis/devolatilization is a basic step of thermochemical processes and requires fundamental characterization. In this paper, the kinetic model of pyrolysis is specified as a one-step global reaction. This type of reaction is used to describe the thermal degradation of wheat straw samples by measuring rates of mass loss of solid matter at a linear increase in temperature. The mentioned experiments were carried out using a derivatograph in an open-air environment. The influence of different factors was investigated, such as particle size, humidity levels, and the heating rate in the kinetics of devolatilization. As the measured values of mass loss and temperature functions transform in Arrhenius coordinates, the results are shown in the form of saddle curves. Such characteristics cannot be approximated with one equation in the form of Arrhenius law. For use in numerical applications, transformed functions can be approximated by linear regression for three separate intervals. Analysis of measurement resulting in granulation and moisture content variations shows that these factors have no significant influence. Tests of heating rate variations confirm the significance of this impact, especially in warmer regions. The influence of this factor should be more precisely investigated as a general variable, which should be the topic of further experiments.
ISSN:2090-1968
2090-1976
DOI:10.1155/2016/9534063