Effects of the Temperature Bulge in CO2 Absorption from Flue Gas by AqueousMonoethanolamine

摘要

Pilot plant data for CO2 absorption by aqueous monoethanolamine have been simulatedwith the RateSep model and a dynamic model implemented in gPROMS. RateSep is thesecond generation rate-based model in AspenPlus. Due to the phenomena of combinedabsorption and water vaporization and condensation, a temperature bulge will appear in theabsorber. The present study addresses the effects of column parameters including L/G, heatof absorption, height of packing and flue gas CO2. The temperature bulge is quantified byits magnitude and location and how these affect the absorber performance. When the bulgeis located in the top or bottom of the column, the magnitude is close to the limiting valuesof the temperature in the liquid and gas, respectively, leaving the column. The magnitude ismaximized when the bulge is located approximately in the middle of the column. Theabsorber performance seems independent of the bulge location when it is located in the topor in the bottom of the column, while it might affect the performance when located in themiddle.