283156 Comparisons of Solvents for Post-Combustion CO2 Capture Using a Multi-Objective Analysis Approach

Tuesday, October 30, 2012: 2:24 PM
302 (Convention Center )
Anita S. Lee and John R. Kitchin, Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA

Gas scrubbing using amine solvents is one of the most promising first generation technologies for post-combustion CO2 capture.  However, the high parasitic energy demand associated with the leading commercially available amine solvent, monoethanolamine, has motivated the development of new amine solvents.  1-2  As new solvents are developed, the need arises to be able to quantify and compare improvements in energy and utility demands of CO2 capture at the process level.   In this work we uses ASPEN Plus to model the CO2 capture and compression process for three different amines, monoethanolamine (MEA), diethanolamine (DEA), and Amino-2-methyl-1-propanol (AMP).  Utilizing  ModeFrontier and the modeling framework of Eslik and Miller3 we identify amine specific optimal operating and process conditions, considering energy demands, water consumption, and capital costs as design objectives. These solutions provide the basis of comparison of performance between amines.  Additionally, we analyze trade-offs between design objectives for each amine.  This work illustrates the complexities associated with the CO2 capture process and identifies an approach to comparing the performance of different solvents.

(1) Singh, D.; Croiset, E.; Douglas, P. L.; Douglas, M. A., Techno-economic study of CO2 capture from an existing coal-fired power plant: MEA scrubbing vs. O-2/CO2 recycle combustion. Energ Convers Manage 2003, 44 (19), 3073.

(2) NETL, Cost and Performance Baseline for Fossil Energy Plants. 2010.

(3) Eslick, J. C.; Miller, D. C., A multi-objective analysis for the retrofit of a pulverized coal power plant with a CO(2) capture and compression process. Computers & Chemical Engineering 2011, 35 (8), 1488.

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