Performance Prediction of Structured Packing Column for Cryogenic Air Separation with Hybrid Model

Xiaobin Zhang; Jiakai Zhu; Zhao Wu; Wei Xiong; Xuejun Zhang; Limin Qiu

doi:10.1016/j.cjche.2014.06.004

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Performance Prediction of Structured Packing Column for Cryogenic Air Separation with Hybrid Model

分离科学与工程 | Updated：2026-01-06

- Performance Prediction of Structured Packing Column for Cryogenic Air Separation with Hybrid Model
- Chinese Journal of Chemical Engineering Vol. 22, Issue 8, Pages: 930-936(2014)
- Affiliations：
  
  Institute of Refrigeration and Cryogenics, Zhejiang University,Hangzhou,China,310027
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2014.06.004
  CLC：
- Published：2014
- Accepted：
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Xiaobin Zhang, Jiakai Zhu, Zhao Wu, Wei Xiong, Xuejun Zhang, Limin Qiu. Performance Prediction of Structured Packing Column for Cryogenic Air Separation with Hybrid Model[J]. Chin.J.Chem.Eng., 2014, 22(8): 930-936.
DOI：

Xiaobin Zhang, Jiakai Zhu, Zhao Wu, Wei Xiong, Xuejun Zhang, Limin Qiu. Performance Prediction of Structured Packing Column for Cryogenic Air Separation with Hybrid Model[J]. Chin.J.Chem.Eng., 2014, 22(8): 930-936. DOI： 10.1016/j.cjche.2014.06.004.

摘要

Abstract

A detailed investigation of a thermodynamic process in a structured packing distillation column is of great importance in prediction of process efficiency. In order to keep the simplicity of an equilibrium stagemodel and the accuracy of a non-equilibrium stage model

a hybrid model is developed to predict the structured packing column in cryogenic air separation. A general solution process for the equilibrium stage model is developed to solve the set of equations of the hybrid model

in which a separation efficiency function is introduced to obtain the resulting tri-diagonal matrix and its solution by the Thomas algorithm. As an example

the algorithm is applied to analyze an upper column of a cryogenic air separation plant with the capacity of 17000 m

·h

-1

. Rigorous simulations are conducted using Aspen RATEFRACmodule to validate the approach. The temperature and composition distributions are in a good agreementwith the two methods. The effects of inlet/outlet position and flowrate on the temperature and composition distributions in the column are analyzed. The results demonstrate that the hybrid model and the solution algorithms are effective in analyzing the distillation process for a cryogenic structured packing colum

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