Simulation Of CO2 Capture From An Aluminium
Production Plant
Author(s)
S. Dayarathna , A. Weerasooriya , S. Hussain, M. Zarsav,
A. Mathisen, H. Sørensen & M. C. Melaaen
Abstract
Effective capture of CO2 from different industrial processes is considered as an
important strategy with the growing concern over the greenhouse gas emission
issue all around the world. The aluminium industry accounts for a large amount
of CO2 emissions into the atmosphere during its operations annually, generally at
low CO2 concentrations below 1 vol% which eventually makes the CO2 capture
process more difficult and costly. Therefore, the CO2 capture process at different
alternative flue gas streams having CO2 concentrations of 3, 4, 7 and 10 vol%
were simulated to analyze the effect of CO2 concentration and other process
parameters on re-boiler energy demand and the capture efficiency of the plant.
Post combustion capture together with chemical absorption has been selected
for this study and monoethanolamine (MEA) has been selected as the CO2
capture solvent. An open loop CO2 capture process was modeled and simulated
using rate based electrolyte NRTL property method in Aspen Plus in order to
observe the variation of specific re-boiler heat duty and the capture efficiency
with the different process parameters. The capture efficiency of the process was
kept at 85% and 90% to observe the effect of main process parameters including
absorber height, absorber diameter and stripper height on the specific re-boiler
heat duty at the stripper.
The results from the simulations indicated that the optimum specific re-boiler
heat duty for the flue gas CO2 concentrations from 3 to 10 vol% lies within the
range of 3.56 to 3.60 MJ/kg of CO2 captured for 85% efficiency and 3.59 to
3.61 MJ/kg of CO2 captured for 90% efficiency respectively. Optimum specific
re-boiler heat duty shows a small difference, between 3 and 10 vol% CO2
concentrations for a given capture efficiency and between 85% and 90% capture
Keywords
aluminium production plant, flue gas, post combustion, carbon dioxide capture, aspen plus, simulation, process optimization
Related Book
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