Integration between biomass gasification and high-temperature electrolysis for synthetic methane production

The energy system analysis of an integrated process producing synthetic natural gas (SNG) from woody biomass has been carried out. Two different configurations have proposed and modeled, considering the integration between gasification, solid oxide electrolysis (SOEC) catalytic reactors for methane synthesis. two investigated differ in size SOEC unit. In first configuration, unit is sized to increase H2 content produced syngas satisfy methanation reaction stoichiometric requirement. second provides gasifier requested amount oxygen. For this additional section composed a water shift (WGS) reactor carbon capture sequestration (CCS) required adjust reacting composition thus ensure proper stoichiometry process. compared at same gasification condition. modeled studied choose parameters' appropriate values, as equivalence ratio steam-to-biomass ratio, their impact on outlet temperature composition. whole analyzed thermodynamic standpoint. After thermal streams plant, efficiency calculated both configurations: one (SOEC hydrogen requirement) presented 71.7 %, while oxygen showed 66.8 %.