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Numerical Modeling of Two-Phase Flow inside a Wet Flue Gas Absorber Sump

Author

Listed:
  • Nejc Vovk

    (Faculty of Mechanical Engineering, University of Maribor, 2000 Maribor, Slovenia
    These authors contributed equally to this work.)

  • Jure Ravnik

    (Faculty of Mechanical Engineering, University of Maribor, 2000 Maribor, Slovenia
    These authors contributed equally to this work.)

Abstract

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.

Suggested Citation

  • Nejc Vovk & Jure Ravnik, 2023. "Numerical Modeling of Two-Phase Flow inside a Wet Flue Gas Absorber Sump," Energies, MDPI, vol. 16(24), pages 1-17, December.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:24:p:8123-:d:1302309
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    References listed on IDEAS

    as
    1. Cataldo De Blasio & Gabriel Salierno & Donatella Sinatra & Miryan Cassanello, 2020. "Modeling of Limestone Dissolution for Flue Gas Desulfurization with Novel Implications," Energies, MDPI, vol. 13(23), pages 1-20, November.
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