Design of gasification process flow sheet with the chemical looping blocks in aspen plus

In order to improve hydrogen yield and carbon dioxide capture from Nigeria's abundant agro-waste, a downdraft gasification model was simulated using Aspen Plus, with blocks representing decomposition, oxidation, reduction, and syngas separation. The study looked at the effects of gasification parameters like steam-to-biomass ratio (SBR), equivalency ratio (ER), and steam-to-air ratio (SAR) on syngas yield, heating value, and cold gas efficiency (CGE). The results indicate that while increasing SBR improves hydrogen production, ER has a significant impact on syngas quality and carbon conversion. Using FeO₃ as an oxygen carrier, the integration of chemical looping modules showed enhanced CO₂ capture and increased hydrogen generation, making the system more ecologically friendly and sustainable. The results highlight how gasification and chemical looping can be combined to generate renewable energy and reduce carbon emissions in Nigeria.