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Title: Numerical modeling of two-phase flow inside a wet flue gas absorber sump ID Vovk, Nejc (Author)ID Ravnik, Jure (Author) energies-16-08123.pdf (41,41 MB)MD5: CE5646FD56B786C2482CF0ECC9185545  https://www.mdpi.com/1996-1073/16/24/8123 English Article 1.01 - Original Scientific Article FS - Faculty of Mechanical Engineering A numerical model of a flue gas scrubber sump is developed with the aim of enabling optimization of the design of the sump in order to reduce energy consumption. In this model, the multiphase flow of the continuous phase, i.e., water, and the dispersed phase, i.e., air bubbles, is considered. The air that is blown in front of the agitators, as well as the influence of the flow field of the agitators on the distribution of the dispersed phase and the recirculation pumps as outlet, is modeled. The bubble Sauter mean diameter is modeled using the population balance model. The model is used to analyze operating parameters such as the bubble retention time, the average air volume fraction, bubble Sauter mean diameter, the local distribution of the bubble size and the amount of air escaping from the pump outlets at two operating points. The purpose of the model is to simulate the two-phase flow in the sump of the flue gas scrubber using air dispersion technology with a combination of spargers and agitators, which, when optimized, reduces energy consumption by 33%. The results show that the homogeneity of air is lower in the bottom part of the absorber sump and that the amount of air escaping through recirculation pipes equals 1.2% of the total air blown into the absorber sump. The escaping air consists mainly of bubbles smaller than 6 mm. Additional operating point results show that halving the magnitude of the linear momentum source lowers the air retention, as well as the average homogeneity of the dispersed air flue gas scrubbing, air dispersion, numerical model, OpenFoam Published Version of Record 11.12.2023 14.12.2023 18.12.2023 https://www.mdpi.com/ 2023 2023 17 str. Vol. 16, iss. 24, [article no.] 8123 20.500.12556/DKUM-86594 519.6:662.963 1996-1073 178077955 10.3390/en16248123 19.12.2023 248 17 Misc. Copy citation

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## Record is a part of a journal

Title: Energies Energies Molecular Diversity Preservation International 1996-1073 518046745

## Document is financed by a project

Funder: ARIS - Slovenian Research and Innovation Agency P2-0196-2020 Raziskave v energetskem, procesnem in okoljskem inženirstvu

## Licences

License: CC BY 4.0, Creative Commons Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

## Secondary language

Language: Slovenian čiščenje dimnih plinov, disperzija zraka, numerični model