Complete Equation-Oriented Approach for Process Analysis and Optimization of a Cryogenic Air Separation Unit

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• 作者：Qiwen Fu ; Lingyu Zhu ; Xi Chen
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：December 9, 2015
• 年：2015
• 卷：54
• 期：48
• 页码：12096-12107
• 全文大小：589K
• ISSN：1520-5045

文摘

A cryogenic air separation unit produces large volumes of high-purity oxygen, nitrogen, and argon through distillation. Such a complex process with a heat-coupling design, a high purity requirement, and a large-scale feature is difficult to analyze and optimize. In this study, a complete equation-oriented (EO) model, which includes a unit model and a thermodynamic model, is developed for cryogenic air separation involving a low-pressure column, a high-pressure column, and an argon side arm column. The EO approach is then applied to deal with the following three issues in air separation: thermodynamic parameter estimation, process analysis with heat-coupling design, and process optimization with varying load demands. The proposed EO method is superior to traditional sequential modular based commercial software in terms of convergence performance.