Combining model-free and model-fitting methods for the determination of the global kinetics of cashew nut and coconut shells pyrolysis
2008 (English)In: 27th Annual International Conference on Thermal Treatment Technologies 2008, 2008, 688-708 p.Conference paper (Other academic)
Thermal characterisation of unique tropical biomass, as coconut (CcNS) and cashew nut shells (CNS) has been the main focus of a research being conducted by the authors of this study. In this work, the objective was assess avoid the influence of the compensation factor in the kinetics results obtained from model fitting approach. This was done by combining model-free methods and model fitting procedures for the determination of pyrolysis global kinetic parameters of these two tropical biomasses. Thus, thermogravimetric analysis was performed at 10, 30 and 100 K/min in an inert atmosphere. Data analysis was primarily performed using model-free methods. Then, results from these analyses were used as reference for the determination of the reaction order. The results were then compared with those obtained previously through Coats-Redfern method. A good agreement between all the results was achieved and the experimental data were predicted with high precision. The average frequency factor and activation energy for CcNS pyrolysis were 3.16E14 1/s and 195.73±8.29 kJ/mol, respectively. For CNS, they were 1.66E08 1/s and 122.34±18.48 kJ/mol, respectively.\br| The averaged deviation was 12.39 1/s for A and 15.233kJ/mol for Eact, in CNS pyrolysis, while for CcNS was 9.33 1/s for A and 12.661kJ/mol for Eact. It had been proved that model-free methods are reliable auxiliar tools for the determination of apparent kinetics especially, as input data in modelling techniques as well as for generating primary data for model-fitting techniques.
Place, publisher, year, edition, pages
2008. 688-708 p.
pyrolysis, kinetics, isoconversional, model-free, model-fitting methods
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-9139ScopusID: 2-s2.0-55849136212ISBN: 978-160560379-7OAI: oai:DiVA.org:kth-9139DiVA: diva2:25244
27th Annual International Conference on Thermal Treatment Technologies 2008. Montreal, QC. 12 May 2008 - 16 May 2008
QC 20100914. Updated from submitted to published, 201203152008-09-242008-09-242012-03-15Bibliographically approved