Isoconversional kinetic study of the thermal decomposition of sugarcane straw for thermal conversion processes

Abstract

The aim of this work was investigate the kinetics of the thermal decomposition reaction of sugarcane straw. The thermal decomposition experiments were conducted at four heating rates (1.25, 2.5, 5 and 10°C/min) in a thermogravimetric analyzer using nitrogen as inert atmosphere. The kinetic analysis was carried out applying the isoconversional method of Friedman, and the activation energies obtained varied from 154.1kJ/mol to 177.8kJ/mol. The reaction model was determined through master plots, corresponding to a two-dimensional diffusion. The pre-exponential factor of 1.82*10(9)s(-1) was determined by linearization of the conversion rate equation as a function of the inverse of absolute temperature, concerning to activation energy of 149.7kJ/mol, which are in the order of magnitude for biomass thermal decomposition reported in literature. Finally, the theoretical and experimental conversion data showed a very good agreement, indicating that these results could be used for future process modeling involving sugarcane straw.

Production and Physical-Mechanical Characterization of Briquettes from Coconut Fiber and Sugarcane Straw

“…Na literatura, foram encontrados valores entre 8,42 e 13,5% de o teor de umidade da palha de cana-de-açúcar. 22 Hansted, 21 produziu briquetes com três diferentes teores de umidade, e encontrou que 12% de umidade foi o melhor ajuste para a formação dos briquetes. São preferidas biomassas para briquetagem com teor de umidade entre 10% e 15%.…”

“…Na literatura, encontrou-se que a fibra de coco e palha de cana-de-açúcar possuem valores de 77,00% e 86,64% para teor de voláteis, 2,96% e 3,85% para cinza, 20,05% e 9,51% carbono fixo, respectivamente. 22,27 Pode-se notar que alguns resultados encontrados nesse estudo foram similares aos valores de referência.…”

Thermal degradation behavior of cellulose nanofibers and nanowhiskers

“…The cellulose devolatilization temperature is between 250 and 350°C. Above 400°C, the carbonization stage begins, and the char is formed, which is the main component of the final solid residue in the pyrolysis process [5]. Pyrolysis offers a rapid route to cracking all of the complex polymeric structures, and it can vary according to the heating rates and gas velocities and the particle size.…”

Dependence of Pyrolysis Rate of Coal on Temperature

“…It is connected with both a bigger intensiveness on the whole and with influence increase of porous structure of fuel particles on process kinetics. The received data are coordinated with values presented in literature for analogous coals [4][5][6].…”

“…The same factors -temperature, pressure, oxidation environment content influence their efficiency differently, which makes the research process more difficult. Other parameters of pyrolysis are strongly influenced by parameters of burning, gasification and other transformational processes [5]. Nowadays apparatuses with chamber division for different processes have being worked out which makes study of these processes more important [6]: pyrolysis, gasification and burning.…”