Membrane Wetting Performance Simulation Study of Ammonia Water Absorption of CO2 Based on Hollow Fiber Membrane Contactor
The membrane contactor absorption(membrane absorption)technology combines the advantages of membrane separation and gas absorption,exhibiting significant potential in carbon capture technology.However,membrane wetting is a significant obstacle restricting its development and application.The wetting of the membrane in the process of CO2 absorption by ammonia water based on hollow fiber membrane contactor is emphatically studied.In this paper,by introducing the concept of wetting fraction,a two-dimensional stable non-wetting membrane absorption model was established by COMSOL,and the influence of membrane wetting on the CO2 absorption performance under different operating parameters was investigated.The results indicate that membrane wetting significantly affects mass transfer performance,with CO2 removal efficiency and mass transfer rate decreasing by 38.5%and 32.5%,respectively,under fully wetted conditions compared to non-wetted conditions.Changes in gas phase parameters have a greater impact on the non-wetted state,while liquid phase parameters have a more pronounced effect on the wetted state.
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