Determination of effective moisture diffusivity and thermodynamic properties variation of lignocellulosic biomass wastes under different atmosphere using thermogravimetric analysis

FERNANDEZ A.; ROMÁN C; MAZZA G.,; RODRIGUEZ R

Case Studies in Thermal Engineering

Elsevier

Lugar: Londres; Año: 2018 vol. 12 p. 248 - 257

2214-157X

During the thermal process to transform lignocellulosic wastes in energy, the drying process is an important stage because it requires energy and decreases overall process yield.Furthermore, drying process contributes to a cleaner production with a significant reduction in the cost of transport. Moisture diffusivity is an important factor that is considered essential to understand for design, analysis, and optimization of drying processes. In this work, this parameter was analyzed at non-isothermal condition and considering the process under inert and oxidative atmospheres. Lower diffusivities were obtained under low heating rates, due to the disfavoring the moisture diffusion in the particles. Higher Deff values when the drying is carried out under the atmosphere oxidative. Moreover, the thermodynamic parameters and DTA curves were determined. ΔH values are positive in all cases, showing that the drying process is endothermic. ΔG are positive and ΔS negative, indicating that the process is non-spontaneous. DTA curves show that the drying process is endothermic, coinciding with the calculated ΔH.