Aerosol formation in ethanolamines based post combustion CO2 capture plants
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Date
2019-01
Authors
Saparov, Ablay
Journal Title
Journal ISSN
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Publisher
Nazarbayev University School of Engineering and Digital Sciences
Abstract
In recent years, capture of carbon dioxide released from fuel-combustion
has become one of the most important field operations. A commonly used
process for carbon dioxide capture is applying a post-combustion-CO2-capture
(PCCC) column with solvents like aqueous methyldiethanolamine (MDEA),
monoethanolamine (MEA), and other amines. There are several reports
indicating formation of aerosol in amine based PCCC columns, which in turn is
associated with solvent losses.
The purpose of this work was to investigate the mechanism of nucleation
(leading to an aerosol or particulate matter formation) for three solvents (MEA,
MDEA, and a mixture of MEA and MDEA) using the molecular dynamic
simulations. Additionally, two cases with different solvent compositions,
corresponding to industrial usage, were simulated. Using the simulations, role
of different solvents were analyzed in order to identify the mechanism and rate
of aerosol formation. The results provide insights to the structure and
composition of the aerosol. In particular, we observed a highest growth for the
case with aqueous MDEA solution, whereas nucleation was fast for MEA
solutions. Furthermore, the rate of formation of aerosol increased with
increasing CO2 concentrations. The formed aerosols mainly consisted of water,
CO2, and the ethanolamines. Taken together, the result from this work
contributes to better understand aerosol formation in PCCC columns.
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Citation
Saparov, Ablay (2019) Aerosol formation in ethanolamines based post combustion CO2 capture plants. Nazarbayev University School of Engineering