Energy consumption and economic analysis of CO2 2 capture from flue gas by membrane separation coupled with hydrate method

Hydrate-based CO2 2 capture (HBCC), as a new gas separation technique, has been widely studied. CO2 2 hydrate formation requires a higher pressure and lower temperature. In this study, a novel integrated process using membrane separation coupled with hydrate method was proposed to improve the efficiency of CO2 2 capture. The CO2 2 separation process from flue gas was simulated and optimized using Aspen Plus, revealing that the CO2 2 concentration was increased from 15 % to 42.32 % after membrane separation, and further rose to 87.35 % following Hydrate-based gas separation. The energy consumption for CO2 2 capture was calculated to be 2.81 GJ/ tCO2, 2 , with an exergy loss during the hydrate-based separation stage reaching up to 33.26%. The total cost of CO2 2 capture, including equipment investment, was determined to be 82.35 $/t, with an estimated payback period of approximately 6 years. Thus, the process using membrane separation coupled with hydrate method was reasonable and feasible through the energy, exergy and economic analysis. This research introduces a promising large-scale industrial CO2 2 capture process for the advancement of Hydrate-based CO2 2 capture technology.