Nonisothermal drying kinetics of biomass fuels by thermogravimetric analysis under oxidative and inert atmosphere

FERNANDEZ A; SAFFE A.; GERMÁN MAZZA; ROSA RODRIGUEZ

DRYING TECHNOLOGY

TAYLOR & FRANCIS INC

Lugar: Londres; Año: 2017 vol. 35 p. 163 - 172

0737-3937

An in-depth investigation of nonisothermal drying kinetic, the first stage of thermal decomposition, was conducted using thermogravimetric analysis. The studied biomass wastes were peach pits, marc and stalk from the canning, jam and wine industries, respectively. The experimental data have been obtained under oxidative and inert atmosphere at different heating rate (5, 10 and 15K/min), in order to fit to different models to describe drying behavior of agro-industrial wastes. These models were evaluated based on diferent statistical parameters.The Jander?s model showed the best fitting for all experiments, assuming that the tridimensional diffusion is the controlling step of the drying rate. The calculated activation energy values are between 20.31 and 48.41kJ/mol for all agro-industrial wastes at different experimental conditions. Heating rates have a slightly effect on the activation energy. Calculated kinetic parameters for the nonisothermal drying under nitrogen atmosphere are generally higher than those for this phenomenon under air atmosphere.