Enhancement of gasification in oxyfuel BECCS cycles employing a direct recycling CO2 utilisation process

A new method for improving the efficiency of oxyfuel gasification in biomass energy with carbon capture and storage (BECCS) cycles using dioxide recycled from exhaust gases is described modelled. Thermodynamic simulations ASPEN Plus show this process can increase indicated a representative cycle by up to 10.3 % part reducing oxygen requirements reaction. Details syngas production, cold gas (CGE), resulting system temperatures reveal thermodynamic mechanisms contributing observed trends overall efficiency. Exhaust recycling also shown have practical limit beyond which fuel becomes highly diluted, low combustion negatively influence process. For presented here, CO2-enhanced oxy–gasification thermodynamically limited equivalence ratios above λ = 0.13 equilibrium 576 °C. This case produced an 26.9 based on supplied lower heating value (LHV). Further both ideal detailed numerical models highlight several operational settings conditions Principally, coupling between temperatures, allothermal heat, quality are govern performance reactions.