Influence of process operating conditions on solvent thermal and oxidative degradation in post-combustion CO2 capture |
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| Affiliation: | 1. Chemical and Environmental Engineering Department, School of Engineering, University of Seville, C/Camino de los Descubrimientos s/n, 41092 Sevilla, Spain;2. Institute of Mechanical, Process and Energy Engineering (IMPEE), School of Engineering & Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK;3. Research Centre for Carbon Solutions (RCCS), School of Engineering & Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK;1. School of Applied Sciences and Engineering, Faculty of Science, Monash University, Australia;2. School of Applied and Biomedical Sciences, Faculty of Science and Technology, Federation University, Churchill, VIC 3842, Australia;3. School of Chemistry, Monash University, Clayton, VIC 3800, Australia;4. CSIRO Energy Technology – Advanced Coal Technology, Bayview Avenue, Clayton, VIC 3168, Australia;1. Chemical and Environmental Engineering Department, School of Engineering, University of Seville, C/Camino de los Descubrimientos s/n, 41092 Sevilla, Spain;2. Centre for Innovation in Carbon Capture and Storage (CICCS), School of Engineering and Physical Sciences, Heriot-Watt University, EH14 4AS, Edinburgh, UK |
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| Abstract: | The CO2 post-combustion capture with amine solvents is modeled as a complex system interconnecting process energy consumption and solvent degradation and emission. Based on own experimental data, monoethanolamine degradation is included into a CO2 capture process model. The influence of operating conditions on solvent loss is validated with pilot plant data from literature. Predicted solvent consumption rates are in better agreement with plant data than any previous work, and pathways are discussed to further refine the model. Oxidative degradation in the absorber is the largest cause of solvent loss while thermal degradation does not appear as a major concern. Using a single model, the process exergy requirement decreases by 10.8% and the solvent loss by 11.1% compared to our base case. As a result, this model provides a practical tool to simultaneously minimize the process energy requirement and the solvent consumption in post-combustion CO2 capture plants with amine solvents. |
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| Keywords: | Monoethanolamine thermal and oxidative degradation Process modeling Plant design Integrated experimental and modeling study |
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