Process optimization of CO2 membrane and cryogenic hybrid separation

HU Yongxin1 LIAO Zuwei2 WANG Jingdai2 DONG Hongguang3 YANG Yongrong2

(1.Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang, China 310027)
(2.State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang, China 310027)
(3.School of Chemical Engineering, Dalian University of Science and Technology, Dalian, Liaoning, China 116024)

【Abstract】Separation and purification of carbon dioxide is current research hotspot. With increasing needs for environmental protection, traditional single separation techniques are difficult to meet these discharge specifications. Integration of multiple separation methods has gradually gained research attention. Separation and recovery of carbon dioxide in the integrated gasification combined cycle (IGCC) process was studied by process simulation and polynomial state equations were obtained for such system. Furthermore, a mathematical superstructure model of hybrid membrane-cryogenic flash distillation was established. Optimal separation sequence was found by targeting minimal annual cost at pre-set lower specification of product purity and recovery. The optimized process show excellent separating performance of membrane after flash configuration and multistage membrane structure. Compared to control process, the optimized process not only guarantees the product recovery and purity but also decreases the total annual cost by almost 27%.

【Keywords】 carbon dioxide; recovery; membrane; hybrid; optimization of separation sequence; superstructure;

【DOI】

【Funds】 National Natural Science Foundation of China (91434205, 61590925) National Science Fund for Distinguished Young Scholars (21525627)

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(Translated by KANG GD)

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This Article

ISSN:0438-1157

CN: 11-1946/TQ

Vol 69, No. 03, Pages 943-950

March 2018

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Article Outline

Abstract

  • Introduction
  • 1 Membrane-cryogenic hybrid separation system
  • 2 Mathematical expression of the membrane-cryogenic hybrid separation superstructure
  • 3 Case analyses
  • 4 Conclusion
  • Nomenclatures
  • References