Modeling CO2 capture with aqueous monoethanolamine |
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| Authors: | Jorge M Plaza David Van Wagener Gary T Rochelle |
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| Institution: | 2. CSIRO Manufacturing, Clayton, Victoria 3168, Australia;3. CSIRO Energy, Newcastle, NSW 2300, Australia;1. Process/Energy Systems Engineering Group, School of Engineering, University of Hull, HU6 7RX, UK;2. Telemark Technological Research and Development Centre (Tel-Tek), Norway;1. CSIRO Energy, 10 Murray Dwyer Circuit, Mayfield West, NSW 2304, Australia;2. Department of Chemical Engineering, Curtin University of Technology Australia, GPO Box U1987, Perth, WA 6845, Australia;1. Laboratory of Fluid Separations, Department of Biochemical and Chemical Engineering, TU Dortmund University, Emil-Figge-Str. 70, 44227 Dortmund, Germany;2. Department of Heat and Mass Transfer, Department of Environmental and Process Engineering, Lodz Technical University, Lodz, Poland |
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| Abstract: | Hilliard completed several thermodynamic models in Aspen Plus® for modeling CO2 removal with amine solvents, including MEA–H2O–CO2. This solvent was selected to make a system model for CO2 removal by absorption/stripping. Both the absorber and the stripper used RateSep? to rigorously calculate mass transfer rates. The accuracy of the new model was assessed using a recent pilot plant run with 35 wt.% (9 m) MEA. Absorber loading and removal were predicted within 6%, and the temperature profile was approached within 5 °C. An average 3.8% difference between measured and calculated values was achieved in the stripper. A three-stage flash configuration which efficiently utilizes solar energy was developed. It reduces energy use by 6% relative to a simple stripper. Intercooling was used to reach 90% removal in the absorber at these optimized conditions. |
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