Steam gasification of biomass integrated with CO2 capture in a dual fluidized bed with carbon sequestration has several advantages including: (I) Enhanced H2 production due to a shift in the key equilibrium reactions of gasification. (II) Production of a concentrated stream of CO2, suitable for storage. (III) The exothermic carbonation reaction can supply most of the heat demand of the endothermic gasification reactions (IV). Limestone particles show some catalytic activity for tar cracking and reforming. In this study: • A relatively simple model is developed to capture the essence of integrated biomass gasification with cyclic CO2 capture in a dual fluidized bed reactor. • A stoichiometric equilibrium model models conversion of solid biomass particles to dominant gaseous products. • An empirical kinetic model for the carbonation rate of limestone particles was adopted. • The effect of sorbent loss of reactivity due to sintering during cyclic operation was taken into account.

Keywords