A Comparison of the Exergy Efficiencies of Various Heat-Integrated Distillation Columns

Areej Javed, Afaq Hassan, Muhammad Babar, Umair Azhar, Asim Riaz, Rana Mujahid, Tausif Ahmad, Muhammad Mubashir, Hooi Ren Lim, Pau Loke Show, Kuan Shiong Khoo

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7 Scopus citations

Abstract

Distillation has relatively low thermodynamic efficiency, so it is a prime target for process intensification studies. The current research aims to study exergy losses in various heat-integrated distillation columns. A conventional industrial-scale i-butane/n-butane fractionator has been selected as a case study for the comparison of the performances of various heat-integrated designs. The Aspen Plus® process simulator is used to perform steady-state simulations and exergy analyses of the conventional distillation column (CDC), internally heat-integrated distillation column (iHIDiC), externally heat-integrated double distillation columns (EHIDDiC), and vapor recompression (VRC) systems. The results of these exergy analyses show that a modified VRC system (ηE = 10.69%) is the most efficient design for this separation. The exergy efficiency of the conventional VRC system is the same as that of the CDC (ηE = 9.27%). The EHIDDiC system (ηE = 9.77%) is somewhat better than the CDC, whereas iHIDiC shows poor exergy efficiency (ηE = 8.09%), even lower than the CDC.

Original languageBritish English
Article number6498
JournalEnergies
Volume15
Issue number18
DOIs
StatePublished - Sep 2022

Keywords

  • exergy
  • heat integrated distillation column
  • simulation

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