摘要
应用计算流体动力学(CFD)的研究方法,对氨气(尿素醇解法合成碳酸乙烯酯工艺的副产物)在磷酸中化学吸收的气液两相流过程进行了数值模拟。模拟计算采用了多重参考系(MRF)模型和流体体积函数(VOF)多相流模型,通过建立气泡流动的准三维流场和加载传质及非均相反应UDF程序来进行。结果表明,在强烈机械搅拌下进行鼓泡吸收时,NH3气泡不断进行旋转涡流运动,两相流动的湍动程度因漩涡流的存在而提高;并且,在强湍动流场的作用下,气泡被拉伸、破裂,气液相界面积大幅增加,气相向液相的传质速率大大加快,NH3的化学吸收得到强化。
The gas-liquid two-phase flow process of chemical absorption of ammonia(a by-product of alcoholysis of urea into ethylene carbonate)in phosphoric acid was numerically simulated using the Computational Fluid Dynamics(CFD)method.The Multi-Reference System(MRF)model and Volume of Fluid(VOF)multiphase flow model were used for the simulation calculation.The quasi-three—dimensional flow field of bubble flow was established and the UDF program of fixed boundary conditions was loaded.The results showed that when the bubble absorption was carried out under strong mechanical agitation,the NH_(3) bubble continuously whirled and the degree of turbulence in the two-phase flow was increased due to the existence of vortex flow.In addition,the bubble was stretched and broken under the action of strong turbulent flow field,the gas-liquid boundary area increased significantly,the mass transfer rate of gas-liquid phase was greatly accelerated,and the chemical absorption of NH_(3) was strengthened.
作者
张海亮
郑晓明
何小荣
ZHANG Hai-liang;ZHENG Xiao-ming;HE Xiao-rang(School of Petrochemical Engineering,Lanzhou Petrochemical Polytechnic,Lanzhou 730060,China)
出处
《兰州石化职业技术学院学报》
2021年第1期1-4,共4页
Journal of Lanzhou Petrochemical Polytechnic
关键词
化学吸收
气液两相流
CFD
数值模拟
chemical absorption
gas-liquid two-phase flow
CFD
numerical simulation
