Power generation from fossil fuel-fired power plants is the largest singlesource of CO2 emissions. Post combustion capture via chemical absorption isviewed as the most mature CO2 capture technique. This paper presents a study ofthe post combustion CO2 capture with monoethanolamine (MEA) based on dynamicmodelling of the process. The aims of the project were to compare two differentapproaches (the equilibrium-based approach versus the rate-based approach) inmodelling the absorber dynamically and to understand the dynamic behaviour ofthe absorber during part load operation and with disturbances from the stripper.A powerful modelling and simulation tool gPROMS was chosen to implement theproposed work. The study indicates that the rate-based model gives a betterprediction of the chemical absorption process than the equilibrium-based model.The dynamic simulation of the absorber indicates normal absorber columnoperation could be maintained during part load operation by maintaining theratio of the flow rates of the lean solvent and flue gas to the absorber.Disturbances in the CO2 loading of the lean solvent to the absorbersignificantly affect absorber performance. Further work will extend the dynamicmodelling to the stripper for whole plant analysis.
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