Performance analysis of solar-assisted CO2 adsorption capture system based on dynamic simulation

Abstract

Carbon Capture, Utilization and Storage (CCUS) is regarded as one of the most economical solutions to achieve reasonable emission reductions for small and medium-sized point sources in the IEA Clean Technology Scenario (CTS). In order to reduced dependency of fossil energy, the solar-assisted post-combustion CO2 capture system are proposed and studied in past decade. Nevertheless, the most of existing feasibility studies on solar-assisted CO2 capture system are steady-state analysis under certain fixed working conditions, which tend to ignore the impact of fluctuations in weather conditions and even lead to a misguiding on feasibility study. Hence, the dynamic simulation model is necessary as it could provide more detailed information and close to the actual situation. This study presents a design of a solar-assisted 5-step temperature-vacuum swing adsorption CO2 capture (SOL-TVSA) system for an industrial emission source. Verified by experiments of core unit, a dynamic simulation system is established and the influences of cyclic parameters on dynamic performance are evaluated. Results show that when vacuum pressure is lower than 6 kPa and desorption temperature exceeds 70 °C, the recovery rate and purity of TVSA system can exceed 95% and 85% respectively. When the volume-area ratio is below 0.3, the annual amount of CO2 captured by SOL-TVSA system could exceed 2.11 ton and solar fraction can exceed 38.81%. The maximum values of coefficient of performance and exergy efficiency can reach 2.20 and 9.81% respectively.