【摘要】 为提升碳捕集效率，针对吸收塔核心设备，研究了气相入射角度对双接触式吸收床内气液两相流场特性的影响。采用FLUENT数值模拟的方法模拟气相入射角自垂直气相入射、15°、30°、45°、60°和75°逐渐增大时双接触式碳捕集气液两相吸收床的流场特性，研究其对混合相压力、气相压降、压降系数和液相流速的影响。结果表明：混合相压力在高度0.2～0.55 m范围内压力在25～180 Pa快速变化，在高度0.55～1.15 m范围内混合相压力在0～25 Pa变化缓慢；气相压降方面，不同气相入射角度的气相压降均呈现先剧烈增大后趋于平稳的趋势。气相压降系数方面，在75°大角度入射时，压降系数最低，仅为194.24 Pa/m,在15°小角度入射时，压降系数最大，为212.7 Pa/m,显著低于常见的填料塔。液相流速方面，在垂直气相入口入射和15°入射时，液相回落位置主要发生在气相入口一侧，45°入射和60°入射时液相回落位置主要发生在气相入口的对侧，30°入射和75°入射时液相回落位置分别发生在气相入口的两侧，且液相回流面积随入射角度的增大有着明显差异。由此可见气相入射角度对双接触式碳捕集气液两相吸收床流场有着显著影响，研究可为后续大型设备增通量、减压降提供研究基础。更多还原

【Abstract】 To enhance carbon capture efficiency, the impact of the gas phase incidence angle on the characteristics of the gas-liquid two-phase flow field within a dual contact absorption bed is studied, targeting the core equipment of the absorption tower. In this paper, FLUENT numerical simulation is used to simulate the flow field characteristics of the dual-contact carbon capture gas-liquid two-phase bed when the gas-phase incidence angle gradually increases from vertical gas-phase incidence, 15°, 30°, 45°, 60° and 75°, and to study its effects on the mixed-phase pressure, gas-phase pressure drop, pressure drop coefficient and liquid-phase flow rate. The results showed that the mixed-phase pressure varied rapidly from 25 Pa to 180 Pa within the height range of 0.2-0.55 m, and slowly from 0 Pa to 25 Pa within the height range of 0.55-1.15 m. The gas-phase pressure drop showed a tendency to increase dramatically and then stabilise at different gas-phase incidence angles. In terms of gas-phase pressure drop coefficient, the lowest pressure drop coefficient was 194.24 Pa/m at 75° large angle of incidence, and the largest pressure drop coefficient was 212.7 Pa/m at 15° small angle of incidence, which was significantly lower than that of the common packed tower. In terms of liquid-phase flow rate, the liquid-phase fallback position mainly occurs on one side of the gas-phase inlet at vertical gas-phase inlet incidence and 15° incidence, the liquid-phase fallback position mainly occurs on the opposite side of the gas-phase inlet at 45° incidence and 60° incidence, the liquid-phase fallback position occurs on the two sides of the gas-phase inlet at 30° incidence and 75° incidence, and the liquid-phase reflux area is significantly different with the increase in the angle of incidence. It can be seen that the gas-phase incidence angle has a significant effect on the flow field of the gas-liquid two-phase absorber bed with dual-contact carbon capture, and this study can provide a research basis for the subsequent large-scale equipment to increase the flux and reduce the pressure drop.更多还原