摘要
为了探究折叠塔板传质过程的微观细节特征,耦合基于液相总体积传质系数的传质模型和二阶不可逆化学反应动力学方程,应用计算流体动力学(CFD)理论对折叠塔板上乙醇胺(MEA)溶液吸收CO_(2)的传质过程进行数值模拟.结果表明:相较失效化学反应,化学吸收反应能够提高CO_(2)的吸收率,在表观气速分别为0.56、0.64和0.72 m/s的条件下,体积时间平均增强因子分别为32.9、31.4和29.2,与文献中相似流速条件的增强因子范围相同,这表明考虑整体传质系数的简化方式有更好的准确性;在表观气速、液体载荷、入口气体CO_(2)摩尔分数和入口液体MEA摩尔分数4种影响因素中,入口液体MEA摩尔分数的变化更能影响气相中CO_(2)的脱除率.
To investigate the micro-scale mechanisms of the mass transfer process in the folding sieve tray,the mass transfer model based on the volume-based overall liquid-phase mass transfer coefficient and the second-order irreversible chemical reaction kinetics equation were coupled.The computational fluid dynamics(CFD)methodology was employed to simulate CO_(2)absorption by monoethanolamine(MEA)solution on the folding sieve trays.The results show that compared with no chemical reaction,the CO_(2)absorption rate with chemical reactions is significantly improved.The average volumetric time enhancement factors are 32.9,31.4 and 29.2 for apparent gas velocities of 0.56,0.64 and 0.72 m/s,respectively,which are in the same range as those reported for similar flow rates.The simplification with considering overall mass transfer coefficient has good accuracy.Among the four affecting factors of apparent gas velocity,liquid load,mole fraction of inlet gas CO_(2)and mole fraction of inlet liquid MEA,the change of mole fraction of inlet liquid MEA exhibits the strongest influence on the removal rate of CO_(2)in the gas phase.
作者
张平
付桂友
ZHANG Ping;FU Guiyou(College of Mechanical and Power Engineering,Shenyang University of Chemical Technology,Shenyang,Liaoning 110142,China)
出处
《江苏大学学报(自然科学版)》
北大核心
2025年第5期604-612,共9页
Journal of Jiangsu University(Natural Science Edition)
基金
辽宁省自然科学基金资助项目(2022-MS-0310)。
关键词
折叠塔板
数值模拟
气液传质
增强因子
脱除率
folding sieve tray
numerical simulation
gas-liquid mass transfer
enhancement factor
removal rate
