Finite Rate Reaction Mechanism Adapted for Modelling Pseudo-Equilibrium Pyrolysis of Cellulose

This manuscript is related to a formulation for modelling cellulose pyrolysis with a pseudo-equilibrium approach. The objective is to model the kinetics of the cellulose pyrolysis with a semi-global mechanism obtained from the literature in order to obtain the yield and the rate of formation, mainly...

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Bibliographic Details
Published in:Processes 2022-10, Vol.10 (10), p.2131
Main Author: Chandía, Tomás Mora
Format: Article
Language:English
Subjects:
Analysis
Biomass
Carbon
Carbon dioxide
Cellulose
Chemical reaction, Rate of
Decomposition
Devolatilization
Equilibrium
Gases
Hemicellulose
Kinetics
Lignin
Lignocellulose
Mathematical models
Modelling
Nonlinear differential equations
Pyrolysis
Reaction mechanisms
Solid phases
Tar
Vapor phases
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Summary:This manuscript is related to a formulation for modelling cellulose pyrolysis with a pseudo-equilibrium approach. The objective is to model the kinetics of the cellulose pyrolysis with a semi-global mechanism obtained from the literature in order to obtain the yield and the rate of formation, mainly that of char. The pseudo-equilibrium approach consists of the assumption that the solid phase devolatilisation can be described kinetically—at a finite rate—thus preserving the competitive characteristic between the production of char and tar, while the gas phase can be described directly by means of chemical equilibrium. The aforementioned approach gives a set of ordinary, linear, and nonlinear differential equations that are solved numerically with a consistent numerical scheme (i.e., the Totally Implicit Euler method). Chemical equilibrium was solved using CANTERA coupled with a code written in MATLAB. The results showed that the scheme preserved the tar-gas competitive characteristic for cellulose pyrolysis. The gas phase was defined as a mixture of CO2, CO, H2O, CH4, H2, and N2, showing a similar composition compared to models from the literature. Finally, the extension of the model to biomass in general is straightforward for including hemicellulose and lignin. The formulation is described in detail throughout the document in order to be replicated and evaluated for other biological components.
ISSN:2227-9717
2227-9717
DOI:10.3390/pr10102131