The integration of Carbon Capture and Utilization (CCU) technologies into energy production systems represents a practical and effective approach to achieving near-zero CO 2 emissions. This research introduces an advanced energy system that synergistically combines power-to-gas (PtG) technology with CCU processes applied to the flue gases of a biomass-fueled Externally Fired Gas Turbine Cycle (EGTC). In this configuration, syngas generated from the gasification of municipal solid waste (MSW) is employed as fuel for the EGTC to produce electricity. The resultant flue gases are then subjected to multiple stages of heat recovery before entering a carbon capture unit for CO 2 separation. The captured CO 2 is subsequently combined with green hydrogen within a methane reactor (MR) to produce renewable natural gas (RNG), thereby transforming waste emissions into a valuable energy resource. Thermodynamic modeling of the system was carried out utilizing Engineering Equation Solver (EES), whereas Aspen HYSYS was employed to simulate the post-combustion CO 2 capture process. Furthermore, a parametric sensitivity analysis was conducted to evaluate the influence of key design parameters on the overall system performance. The findings reveal that the electrolyzer cycle and the EGTC are the principal sources of exergy destruction, accounting for 32.6% and 25.3%, respectively. The system delivers a net electrical output of 5521.896 kW and a thermal output of approximately 9,569 kW, while facilitating the annual production of approximately 6,817 tons of RNG and 26,697 tons of oxygen. The overall energy and exergy efficiencies are 68.57% and 43.4%, respectively. The implementation of CCU results in an annual reduction of approximately 16,644.7 tons per year of CO 2 emissions, underscoring the system’s significant potential for sustainable, lowcarbon energy generation.

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