Thermal decomposition of sugarcane straw, kinetics and heat of reaction in synthetic air

Yesid Javier Rueda-Ordóñez; Katia Tannous

doi:10.1016/j.biortech.2016.03.035

Thermal decomposition of sugarcane straw, kinetics and heat of reaction in synthetic air

Bioresour Technol. 2016 Jul:211:231-9. doi: 10.1016/j.biortech.2016.03.035. Epub 2016 Mar 10.

Authors

Yesid Javier Rueda-Ordóñez¹, Katia Tannous²

Affiliations

¹ School of Chemical Engineering, University of Campinas, 500 Albert Einstein Avenue, Campinas, SP, 13083-852, Brazil.
² School of Chemical Engineering, University of Campinas, 500 Albert Einstein Avenue, Campinas, SP, 13083-852, Brazil. Electronic address: katia@feq.unicamp.br.

PMID: 27019126
DOI: 10.1016/j.biortech.2016.03.035

Abstract

The aim of this work was to analyze the thermal decomposition, kinetics and heat of reaction of sugarcane straw in synthetic air by thermogravimetry (TG) and differential scanning calorimetry (DSC). The TG and DSC experiments were carried out using heating rates of 2.5°C/min, 5°C/min, and 10°C/min, and particle diameter of 0.250mm. In the study of the smoldering reaction were identified three consecutive stages, drying, oxidative pyrolysis, and combustion. Thus, the kinetic pathway was composed by six independent parallel reactions, three for each stage after drying, in which the activation energies were 176, 313, 150, 80, 150, and 100kJ/mol. The heat of reaction in synthetic air was completely exothermic releasing 8MJ/kg. The modeled curves of thermal decomposition of sugarcane straw presented good agreement with experimental data. Then, the kinetic parameters obtained could be used to analyze different processes involving smoldering.

Keywords: Activation energy; Biomass; Combustion; Pyrolysis; Thermogravimetry.

MeSH terms

Calorimetry, Differential Scanning
Heating
Kinetics
Models, Theoretical
Saccharum / chemistry*
Thermogravimetry