期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 52, 期 23-24, 页码 5330-5338出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2009.06.038
关键词
Distillation; Packed column; Simulation; Computational fluid dynamics (CFD); Diffusivity
资金
- National Natural Science Foundation of China [20736005]
- State Key Laboratories for Chemical Engineering (Tianjin University)
A numerical method is proposed for modeling the distillation process in a randomly packed column. The proposed model is able to predict the axial and radial concentration distributions along the column without introducing the empirical turbulent Schmidt number or the experimentally measured turbulent mass transfer diffusivity. The present model involves the differential mass transfer equation set and the accompanied computational fluid dynamics (CFD) formulation with the conventional k - epsilon model. For the clop sure of mass transfer equation, the recently developed two-equation model is adopted, which consists of the equations for expressing the fluctuating concentration variance (c(2)) over bar and its dissipation rate epsilon(c) [Z.M. Sun, B.T. Liu, X.G. Yuan, Q. Liu, K.T. Yu, New turbulent model for computational mass transfer and its application to a commercial-scale distillation column, Ind. Eng. Chem. Res. 44 (12) (2005) 4427-4434]. The validity of the proposed model was testified by applying to a commercial scale randomly packed column of 1.22 m internal diameter and packed with 50.8 mm metal Pall rings in 3.66 m bed height for sepumarating cyclohexane/n-heptane mixture under total reflux and 165.5 kPa [A. Shariat, J.G. Kunesh, Packing efficiency testing on a commercial scale with good (and not so good) reflux distribution, Ind. Eng. Chem. Res. 34 (4) (1995) 1273-1279]. Satisfactory agreements were found between the model prediction and the published experimental measurement on the axial concentration distributions, the HETP and the turbulent mass transfer diffusivity along the radial and axial directions. (C) 2009 Elsevier Ltd. All fights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据