BIOMASS PYROLYSIS: THERMODYNAMIC PARAMETERS REVIEW AND DETERMINATION THROUGH TGA
Résumé
In this work, the focus is set on the development of thermochemistry models for hardwood (HW) pellets pyrolysis reaction at heating rates ranging from 10 to 60 K/min. Thermogravimetric Analysis (TGA) coupled with Differential Scanning Calorimetry (DSC) was used to determine the following parameters: Activation Energy (Ea), pre-exponential factor (A), order of reaction (n) and mass loss fractions of pseudo components (F_i). These parameters have been determined thanks to an optimization approach (Torres-Herrador et al. 2020) as well as isoconversional methods. Activation energies were determined for drying of water (30-35 kJ/mol), and for the pyrolysis of pseudo components hemicellulose (155-160 kJ/mol), cellulose (170-185 kJ/mol) and lignins (220-230 kJ/mol). Combined TGA/DSC results highlight the correlation between the degradation of the different compounds (cellulose, hemicellulose, lignins) and the heat flux released. The results were then juxtaposed with existing literature data using a comprehensive comparison graph. Comparison between the determination techniques and the associated results in literature was performed to determine their impact on the parameters found.
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