The global energy crisis and escalating environmental concerns are driving the development of clean

renewable energy sources. However

significant variability in the quality of biomass conversion products hinders widespread biomass utilization. This study proposes an integrated system combining biomass gasification

water electrolysis

and methanation to enable the stable production of high-purity methane (CH4) from diverse biomass feedstocks. Through rigorous process modeling using Aspen Plus

key factors influencing integrated system performance were identified

with particular emphasis on the synergistic coupling between the water electrolysis

biomass gasification

and methanation units. Results indicate that elevated temperatures in both the electrolyzer and gasifier enhance carbon conversion efficiency and CH4 production rate. Under optimized conditions

the CH4 volumetric fraction in the product gas exceeds 99.7%

while the overall system efficiency reaches 55%. This integrated approach not only enhances biomass conversion efficiency but also reduces energy consumption and processing costs. Furthermore

it provides crucial theoretical insights and technical support for designing and implementing scalable

multiinput renewable energy systems that coutilize biomass and green electrolytic hydrogen (H2) for sustainable fuel production.