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Optimal configuration of ternary distillation columns using heat integration with external heat exchangers

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  • Khalili, N.
  • Kasiri, N.
  • Ivakpour, J.
  • Khalili-Garakani, A.
  • Khanof, M.H.

Abstract

The subject of energy saving in distillation column sequencing is of critical importance. Heat integration in a multicomponent separation can be industrialized by saving considerable energy and cost. In this work, external heat-integrated distillation column with external heat exchanger has been studied and the annual cost function has been optimized using Genetic Algorithm. Introducing the layout and binary matrices enabled the investigation of all possible locations for the heat exchanger arrangement successfully. Moreover, exchangers heat loads and compressors pressure, have also been considered as optimization variables. Benzene, toluene, xylene and n-alkanes, separations have been studied as case studies. It has been demonstrated that the proposed optimization method in the alkane separation case decreased the total annual cost by 22.6% in comparison with the proposed thermally coupled distillation sequence columns. The heat integration of external heat exchangers in an external heat-integrated distillation column configuration and the proposed dived-wall column resulted in decreasing the total annual cost by 17% and 39% respectively, in comparison with conventional distillation columns.

Suggested Citation

  • Khalili, N. & Kasiri, N. & Ivakpour, J. & Khalili-Garakani, A. & Khanof, M.H., 2020. "Optimal configuration of ternary distillation columns using heat integration with external heat exchangers," Energy, Elsevier, vol. 191(C).
    • Handle: RePEc:eee:energy:v:191:y:2020:i:c:s0360544219321747
    DOI: 10.1016/j.energy.2019.116479
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    References listed on IDEAS

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    1. Khalili-Garakani, Amirhossein & Ivakpour, Javad & Kasiri, Norollah, 2016. "A new search space reduction method based on exergy analysis for distillation columns synthesis," Energy, Elsevier, vol. 116(P1), pages 795-811.
    2. Shahandeh, Hossein & Jafari, Mina & Kasiri, Norollah & Ivakpour, Javad, 2015. "Economic optimization of heat pump-assisted distillation columns in methanol-water separation," Energy, Elsevier, vol. 80(C), pages 496-508.
    3. Olujić, Ž. & Sun, L. & de Rijke, A. & Jansens, P.J., 2006. "Conceptual design of an internally heat integrated propylene-propane splitter," Energy, Elsevier, vol. 31(15), pages 3083-3096.
    4. Kiss, Anton A. & Flores Landaeta, Servando J. & Infante Ferreira, Carlos A., 2012. "Towards energy efficient distillation technologies – Making the right choice," Energy, Elsevier, vol. 47(1), pages 531-542.
    5. Shahandeh, H. & Ivakpour, J. & Kasiri, N., 2014. "Internal and external HIDiCs (heat-integrated distillation columns) optimization by genetic algorithm," Energy, Elsevier, vol. 64(C), pages 875-886.
    6. Suphanit, B., 2010. "Design of internally heat-integrated distillation column (HIDiC): Uniform heat transfer area versus uniform heat distribution," Energy, Elsevier, vol. 35(3), pages 1505-1514.
    7. Shahandeh, Hossein & Ivakpour, Javad & Kasiri, Norollah, 2014. "Feasibility study of heat-integrated distillation columns using rigorous optimization," Energy, Elsevier, vol. 74(C), pages 662-674.
    8. Suphanit, B., 2011. "Optimal heat distribution in the internally heat-integrated distillation column (HIDiC)," Energy, Elsevier, vol. 36(7), pages 4171-4181.
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