Modelling the biomass updraft gasification process using the combination of a pyrolysis kinetic model and a thermodynamic equilibrium model

Conversion of biomass into gas suitable for further exploitation is one the valuable renewable energy pathways due to wide distribution and availability raw materials. Biomass gasification a thermochemical process partial combustion in reduced oxygen environment that aims produce hydrogen-enriched syngas. Updraft gasifier design, with its advantages high efficiency, produces syngas higher hydrogen yield compared other designs. The main drawback updraft tars outflow decreasing lower heating value. Recently, significant research efforts have focused on optimization gasifiers operating conditions, especially by developing numerical models as complementary approach experiments. simplest modelling predicting behaviour thermodynamic equilibrium model. When describing an gasifier, special focus needs be given pyrolysis stage, since this type reactor products directly from gasifier. In work, pilot-scale was modelled using combination kinetic model To describe behaviour, CRECK-S-BIO two secondary gas-phase mechanisms distinct levels complexity were used. oxidation char through minimization Gibbs free approach. predicted results dry clean experimental data considering eleven different conditions. used detailed mechanism achieved generally average prediction errors. Although some discrepancies observed predictions, these preliminary show considered study represents good basis future development