Macro-TGA Steam-Assisted Gasification of Lignocellulosic Wastes

ANABEL FERNANDEZ BRIZUELA; JOSÉ M. SORIA; ROSA A. RODRÍGUEZ; JAN BAEYENS; GERMÁN D. MAZZA

JOURNAL OF ENVIRONMENTAL MANAGEMENT

ACADEMIC PRESS LTD-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2019 vol. 233 p. 626 - 635

0301-4797

The kinetics of the steam-assistedgasification for three different agro-industrial solid wastes (sawdust, olive andplum pits) was studied by macro thermo-gravimetric analysis (macro-TGA) atdifferent heating rates (5, 10 and 15 K/min). The progressive CO release wasmoreover monitored to fully identify each step of the global gasificationprocess. A single-step kinetics modeling was applied by using the Coats-Redfernmethod, with both a first order model for pyrolysis and a Ginstling -Brounstein 3D-diffusion model for the gasification stages, respectively. Acomparison between macro-TGA and previous TGA results for the same bio-wasteswas performed. Results indicated that the reaction proceeds in three well-definedand subsequent stages, involving water evaporation [298-473 K], biomass de-volatilization[473-648 K] with the highest production of CO, and char gasification as finalstep. Reaction rate parameters of the Arrhenius equation were determined forboth the pyrolysis and gasification steps.