Study on gas-liquid counter-current characteristics of cryogenic fluids on surfaces of structured packings with different inclination angles
The computational Fluid Dynamics(CFD)method is employed to establish a model for local counter-current flow in structured packing.Through the analysis of flow patterns like wetting rates,liquid holdup,the study examines the impact of counter-current gas flow on the flow characteristics of cryogenic nitrogen-oxygen on 45°and 60° inclined packings.The results in-dicate that counter-current gas promotes the wettability of water at ambient temperature but has a negative effect on cryogenic working fluids.For cryogenic fluids,45° packing provides more than 86％wetted area,with the wetting rate decreasing by 6.90％under the influence of counter-cur-rent gas,while the wetting rate for 60° packing decreases only by 0.40％,but its wetted area is approximately 67％.The pressure drop for 60° packing is less than 50 Pa/m,significantly lower than the 45° packing,effectively reducing the pressure drop losses,making it more suitable for the cryogenic distillation process of large processing system.
NETL
NSTL
万方数据
