Grimm A, Gazzani M. A Machine Learning-Aided Equilibrium Model of VTSA Processes for Sorbents Screening Applied to CO
2 Capture from Diluted Sources.
Ind Eng Chem Res 2022;
61:14004-14019. [PMID:
36164596 PMCID:
PMC9501812 DOI:
10.1021/acs.iecr.2c01695]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 08/01/2022] [Accepted: 08/19/2022] [Indexed: 12/03/2022]
Abstract
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The large design space of the sorbents’ structure
and the
associated capability of tailoring properties to match process requirements
make adsorption-based technologies suitable candidates for improved
CO2 capture processes. This is particularly of interest
in novel, diluted, and ultradiluted separations as direct CO2 removal from the atmosphere. Here, we present an equilibrium model
of vacuum temperature swing adsorption cycles that is suitable for
large throughput sorbent screening, e.g., for direct air capture applications.
The accuracy and prediction capabilities of the equilibrium model
are improved by incorporating feed-forward neural networks, which
are trained with data from rate-based models. This allows one, for
example, to include the process productivity, a key performance indicator
typically obtained in rate-based models. We show that the equilibrium
model reproduces well the results of a sophisticated rate-based model
in terms of both temperature and composition profiles for a fixed
cycle as well as in terms of process optimization and sorbent comparison.
Moreover, we apply the proposed equilibrium model to screen and identify
promising sorbents from the large NIST/ARPA-E database; we do this
for three different (ultra)diluted separation processes: direct air
capture, yCO2 = 0.1%, and yCO2 = 1.0%. In all cases, the tool
allows for a quick identification of the most promising sorbents and
the computation of the associated performance indicators. Also, in
this case, outcomes are very well in line with the 1D model results.
The equilibrium model is available in the GitHub repository https://github.com/UU-ER/SorbentsScreening0D.
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