SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2014, Vol. 22 ›› Issue (8): 930-936.DOI: 10.1016/j.cjche.2014.06.004

• 分离科学与工程 • 上一篇    下一篇

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   

  1. Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China
  • 收稿日期:2013-05-29 修回日期:2013-07-24 出版日期:2014-08-28 发布日期:2014-11-04
  • 通讯作者: Limin Qiu
  • 基金资助:

    Supported by the Major State Basic Research Development Program of China (2011CB706501) and the National Natural Science Foundation of China (51276157).

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   

  1. Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China
  • Received:2013-05-29 Revised:2013-07-24 Online:2014-08-28 Published:2014-11-04
  • Supported by:

    Supported by the Major State Basic Research Development Program of China (2011CB706501) and the National Natural Science Foundation of China (51276157).

摘要: 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 m3·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 column.

关键词: Distillation, Cryogenic air separation, Structured packings, Hybrid model, Aspen

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 m3·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 column.

Key words: Distillation, Cryogenic air separation, Structured packings, Hybrid model, Aspen