Modeling and analysis of CO2 capture by aqueous ammonia + piperazine blended solution in a spray column
dc.contributor.author
Xu, Yin
dc.contributor.author
Chen, Xiaole
dc.contributor.author
Zhao, Yongling
dc.contributor.author
Jin, Baosheng
dc.date.accessioned
2021-04-13T05:54:36Z
dc.date.available
2021-04-13T03:09:31Z
dc.date.available
2021-04-13T05:54:36Z
dc.date.issued
2021-07-15
dc.identifier.issn
1383-5866
dc.identifier.other
10.1016/j.seppur.2021.118655
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/478382
dc.description.abstract
Chemical scrubbing using NH3/PZ solution is a promising pathway for mitigating CO2 emission from fossil-fuel combustion. Herein, we developed an advanced model that can predict CO2 absorption using the blended solvent in a spray column. The model was established in the computational fluid dynamics framework coupled with the properties of the blended solvent. The blended properties were evaluated using the linear combination of each single solvent. The established model was also verified by our previous experimental results. The deviations were found to be within ±15%. Further case studies revealed crucial characteristics of the scrubbing process. Due to the entrainment effect, intensive back-mixing behavior was observed in the gas flow. Energy analysis showed that the heat for water warming-up and evaporation mainly comes from the heat released by the CO2 absorption. The profiles of the gaseous species demonstrated that gaseous concentrations of NH3 and H2O vapor quickly approached their equilibrium values, whereas gaseous CO2 concentration exhibited different variation trends along the column. We also found that the gas-side mass-transfer coefficient was two orders of magnitude greater than the liquid-side. Moreover, the spatial separation of the maximum mass-transfer coefficients and the driving force led to a low CO2 absorption rate. The comparisons of the upward and downward spraying schemes indicated that the upward spraying can mitigate the spatial separation and increase droplet residence time and volume fraction, significantly improving the CO2 removal efficiency from 48.2% to 55.9%.
en_US
dc.language.iso
en
en_US
dc.publisher
Elsevier
en_US
dc.subject
Post-combustion CO2 capture
en_US
dc.subject
CFD modeling
en_US
dc.subject
Spray tower
en_US
dc.subject
NH3/PZ blended solution
en_US
dc.subject
Chemical scrubbing
en_US
dc.title
Modeling and analysis of CO2 capture by aqueous ammonia + piperazine blended solution in a spray column
en_US
dc.type
Journal Article
dc.date.published
2021-03-27
ethz.journal.title
Separation and Purification Technology
ethz.journal.volume
267
en_US
ethz.pages.start
118655
en_US
ethz.size
12 p.
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Amsterdam
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2021-04-13T03:09:47Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2021-04-13T05:54:47Z
ethz.rosetta.lastUpdated
2023-02-06T21:41:13Z
ethz.rosetta.versionExported
true
ethz.COinS
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Journal Article [133576]