Modeling of a cyclic sorption-desorption unit for continuous high temperature CO2 capture from flue gas

• Type: Article in International Scientific Journal
• Date: 2022

Authors

Vanessa F. D. Martins (Author) Other; Carlos V. Miguel (Author) Other; Jonathan C. Gonçalves (Author) Other; Alírio E. Rodrigues (Author) Other; Luís Madeira (Author) FEUP

Journal

Title: Chemical Engineering Journal

Vol. 434

Pages: 1-12

ISSN: 1385-8947

Publisher: Elsevier

Indexing

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Associated Projects

HyGreen&LowEmissions - HyGreen&LowEmissions - Tackling Climate Change Impacts: the role of Green Hydrogen production, storage and use, together with low emissions energy systems

Other information

Authenticus ID: P-00W-1ME

DOI: 10.1016/j.cej.2022.134704

Abstract (EN): This study focuses on the modeling of a sorptive unit for CO2 capture at high temperatures, considering as casestudy the data obtained from experiments using a conventional post-combustion stream from coal power plants: 15% CO2/85% N-2 at 623 K and 134 kPa. A one-dimensional (1D) heterogeneous dynamic fixed-bed model able to predict the CO2 equilibrium and kinetics of adsorption on a K-promoted hydrotalcite was successfully developed and implemented in gPROMS (R) software. The bi-Langmuir model was chosen to describe the experimental equilibrium data, as it considers the two different adsorption sites on the K-promoted hydrotalcite. A loss of capacity was observed after the first cycle performed in dry conditions. An Elovich-type expression, accounting for the change in activation energy of adsorption and desorption for each site as a function of the surface coverage, was also introduced in the model. The two sites model was used and an excellent fit to the breakthrough curves of CO2 adsorption/desorption and temperature histories was obtained. In order to make the model more robust, it was additionally validated at 573 K, for a total pressure range between 134 and 200 kPa, in wet conditions. The model validation represents an important advance, since it will allow processes optimization, and consequently the industrial design.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12