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Fast Pyrolysis of Biomass Residues in a Twin-screw Mixing Reactor

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Oxytree Pruned Biomass Torrefaction: Process Kinetics.

Kacper Świechowski¹, Sylwia Stegenta-Dąbrowska², Marek Liszewski³

¹Faculty of Life Sciences and Technology, Institute of Agricultural Engineering, Wrocław University of Environmental and Life Sciences, 37/41 Chełmońskiego Str., 51-630 Wrocław, Poland. kacper.swiechowski@upwr.edu.pl.

Materials (Basel, Switzerland)

|October 17, 2019

Summary

This study determined the torrefaction kinetics of Oxytree biomass, finding temperature significantly impacts mass loss and reaction rates. Cultivation methods and soil types showed no significant effect on these torrefaction parameters.

Keywords:

Oxytree Paulownia activation energy brownfields energy crops fast-growing biomass kinetics parameters pruned biomass renewable energy torrefied biomass valorization

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Area of Science:

Biomass energy conversion
Renewable energy sources
Thermochemical processing

Background:

Oxytree (Paulownia clon in Vitro 112) is a rapidly growing C4 energy crop.
Efficient biomass valorization is crucial for sustainable energy production.
Understanding torrefaction kinetics is key to optimizing biomass conversion.

Purpose of the Study:

To determine the torrefaction kinetic parameters of pruned Oxytree biomass.
To investigate the influence of cultivation method and soil class on these parameters.
To provide data for optimizing waste-to-energy and waste-to-carbon processes.

Main Methods:

Laboratory-scale batch reactor torrefaction of Oxytree biomass.
Temperature range: 200–300 °C under anaerobic conditions.
Continuous mass loss measurement and kinetic parameter analysis.

Main Results:

Relative mass loss increased from 1.22% to 19.56% with rising temperature.
First-order reaction rate constant (k) increased from 1.26 × 10⁻⁵ s⁻¹ to 7.69 × 10⁻⁵ s⁻¹.
Average activation energy was 36.5 kJ·mol⁻¹; cultivation and soil type had no significant effect (p < 0.05).

Conclusions:

Torrefaction temperature is a primary factor influencing Oxytree biomass conversion kinetics.
Oxytree biomass shows potential for efficient energy and carbon valorization.
Cultivation and soil conditions do not significantly alter torrefaction kinetics, simplifying process optimization.