Title: Exergetic simulation study of CO₂ separation by cryogenic distillation

Authors: Y. Nandakishora; Ranjit K. Sahoo; S. Murugan; Sai Gu

Addresses: Department of Mechanical Engineering, National Institute of Technology, Rourkela, India ' Department of Mechanical Engineering, National Institute of Technology, Rourkela, India; National Institute of Technology Meghalaya, India ' Department of Mechanical Engineering, National Institute of Technology, Rourkela, India ' Department of Chemical Engineering, University of Warwick, UK

Abstract: A cryogenic process for CO₂ separation is developed, with exergy minimisation using Aspen Plus software. The RadFrac distillation model is used for the separation of CO₂ from a CO₂/N₂ gas mixture. The process is modified to minimise the energy penalty of CO₂ separation. The comparative study is focused on energy savings, exergy losses, and economic and environmental factors. The energy penalty of the optimised process is approximately 1.049 MJ/kg-CO₂ with purity and recovery of 99.9% and 98%, respectively. The exergy loss in the optimised process is approximately 14% lower than in the basic design.

Keywords: distillation; CO₂ separation; exergy analysis; heat integration.

DOI: 10.1504/IJEX.2023.131892

International Journal of Exergy, 2023 Vol.41 No.3, pp.241 - 256

Received: 22 Jun 2022
Received in revised form: 18 Feb 2023
Accepted: 19 Feb 2023
Published online: 04 Jul 2023 *

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