Enhancing CO2 capture efficiency: CFD investigation of gas-liquid self-suction reactor configurations

The separation and removal of industrial waste gases (such as CO2) has broad prospects. Efficient gas separation and removal equipment is the key to the purification of industrial waste gases. In this study, a new type of gas separation and purification reaction equipment was designed that can effectively improve the capture of CO2. The Propeller self-suction impeller coupled with the dynamic membrane-aeration impeller (Propeller + DMAI, also SDMSR) is the best impeller combination, achieving a gas holdup (epsilon G) of up to 11.4 % and a volume mass transfer coefficient (kLa) of up to 0.061 s- 1. Compared with other combinations, epsilon G and kLa are significantly improved. Additionally, compared with the dynamic membrane-stirred reactor (DMSR) and self-suction stirred reactor (SSR), SDMSR enhances CO2 mass transfer and gas recovery, with a CaCO3 nucleation rate constant of 1.37 s-1, which is 11.38 % and 52.22 % higher than DMSR and SSR, respectively. In summary, this study provides a reference for the separation and purification of special gases.