Supercritical Water Gasification of Tunisian Agricultural Waste for Energy Recovery: Comparative thermodynamic study of sustainable H2 rich syngas production using ASPEN PLUS

Valorization of various Tunisian agricultural wastes via super-critical water gasification (SCWG) for sustainable hydrogen-rich syngas production is stimulated and discussed using AspenOne software. The considered biomass wastes include dates palm residues (DPR), dates palm seed (DPS), olive solid waste (OSW), olive pomace (OP) and pine sawdust (PS). The model results are compared to experimental data from literature for validation. It is found that temperature and biomass feedstock concentration affect considerably the proportion of hydrogen in the producer gases, the hydrogen yield, the hydrogen efficiency (HE), the carbon efficiency (CE) and the gasification efficiency (GE). Olive solid waste, which contains the highest hydrogen percentage of 8.3 wt%, was found to be the most promising biomass. A maximum hydrogen yield of 111.61 mol/kg could be obtained by 1200 K gasifier temperature and 5%wt feedstock.