This study presents a three-dimensional computational particle fluid dynamic (CPFD) simulation of sorption-enhanced gasification (SEG) using almond shells as feedstock. A detailed biomass characterization, including devolatilization behavior and gasification at two different steam-to-biomass ratios, was conducted. The devolatilization tests were performed at a temperature between 600 and 850 °C to derive the kinetic of this fundamental step. Then gasification tests were performed using a lab-scale fluidized bed reactor. A mixture of olivine and dolomite served as the bed material. Experimental data, including gas yield, tar formation, and hydrogen production, were used to tune and validate the CPFD model. Results showed that increasing the steam-to-biomass ratio from 0.5 to 1.0 increased hydrogen yield from 70.2 % to 78.8 %. In contrast, gas yield increased from 0.76 to 0.80 Nm3/kg confirming the positive impact of the in-situ CO2 capture on syngas quality with tar content ranging from 9.5 to 11.6 g/Nm3. Char yield decreased from 39.6 % to 36.0 %. The model closely predicted gasification behavior, though some discrepancies in tar formation were observed.
Three-dimensional computational fluid-dynamic simulation of sorption enhanced gasification
Di Nardo A.;Calchetti G.;
2025-01-01
Abstract
This study presents a three-dimensional computational particle fluid dynamic (CPFD) simulation of sorption-enhanced gasification (SEG) using almond shells as feedstock. A detailed biomass characterization, including devolatilization behavior and gasification at two different steam-to-biomass ratios, was conducted. The devolatilization tests were performed at a temperature between 600 and 850 °C to derive the kinetic of this fundamental step. Then gasification tests were performed using a lab-scale fluidized bed reactor. A mixture of olivine and dolomite served as the bed material. Experimental data, including gas yield, tar formation, and hydrogen production, were used to tune and validate the CPFD model. Results showed that increasing the steam-to-biomass ratio from 0.5 to 1.0 increased hydrogen yield from 70.2 % to 78.8 %. In contrast, gas yield increased from 0.76 to 0.80 Nm3/kg confirming the positive impact of the in-situ CO2 capture on syngas quality with tar content ranging from 9.5 to 11.6 g/Nm3. Char yield decreased from 39.6 % to 36.0 %. The model closely predicted gasification behavior, though some discrepancies in tar formation were observed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
