Title: Performance of rich solvent flashing for MEA-based post-combustion CO₂ capture

Authors: Ali Hasnain; Usman Ali; Muhammad Imran

Addresses: Department of Chemical Engineering, University of Engineering and Technology, G.T. Rd, Lahore 54890, Pakistan ' Department of Chemical Engineering, University of Engineering and Technology, G.T. Rd, Lahore 54890, Pakistan ' Department of Chemical Engineering, University of Engineering and Technology, G.T. Rd, Lahore 54890, Pakistan

Abstract: High energy demand has led to the increased power production from the fossil power plants which are the largest source of CO₂. Monoethanolamine-based post-combustion CO₂ capture is a developed technology to mitigate CO₂, however, it still needs attention towards process modification concerning energy requirements. Rich solvent flashing is the suggested modifications which is discussed in the present work and is used to minimise the overall energy. The minimum reboiler duty was observed at 20%, 30% and 40% split of the lean solvent at certain approach temperatures. The reboiler duty of 3.201 MJ/kg CO₂ was observed at the approach temperatures of 5°C and 10°C with the split fraction of 40%. The system is also modelled using single, double and three flash drums where three flash drums indicates the minimum duty with 5% decrease from the base case model.

Keywords: post-combustion CO₂ capture; PCC; rich solvent flashing; RSF; MEA; flash drum.

DOI: 10.1504/IJGW.2021.113876

International Journal of Global Warming, 2021 Vol.23 No.3, pp.331 - 354

Received: 11 May 2020
Accepted: 28 Oct 2020
Published online: 31 Mar 2021 *

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