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Determination of pyrolysis reaction kinetics of raw and torrefied biomass

Uhrig, Alena (2014) Determination of pyrolysis reaction kinetics of raw and torrefied biomass.

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Abstract:In this research, pyrolysis reaction kinetics of raw chips, torrefied chips and torrefied pellets of mixed waste wood have been studied. Research goals were to investigate the influence of torrefaction as well as densification on pyrolysis reaction rate, activation energy and pre-exponential factor of the Arrhenius relation. Experiments with the three materials were conducted at four temperature profiles and three particle sizes in order to investigate the maximum particle size for which the reaction is still in the kinetic regime. A cyclonic thermogravimetric analyzer, designed at the University of Twente, was used to simulate (fast) pyrolysis conditions. Results show that the maximum particle size for kinetic control is 200 μm for all three material types. For this range, the experimental trend shows that the reaction rate is larger for raw than for torrefied material, indicating a faster reaction of the former. The activation energy is lower for raw than for torrefied material. While the reaction rate is larger, the activation energy and pre-exponential factor are smaller for torrefied pellets than for torrefied chips, denoting an influence of densification on these parameters.
Item Type:Essay (Bachelor)
Faculty:ET: Engineering Technology
Subject:50 technical science in general
Programme:Mechanical Engineering BSc (56966)
Link to this item:http://purl.utwente.nl/essays/65486
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