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Open AccessArticle

Droplet Characteristics of Rotating Packed Bed in H2S Absorption: A Computational Fluid Dynamics Analysis

School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China
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Processes 2019, 7(10), 724; https://doi.org/10.3390/pr7100724
Received: 7 August 2019 / Revised: 5 October 2019 / Accepted: 8 October 2019 / Published: 11 October 2019
Rotating packed bed (RPB) has been demonstrated as a significant and emerging technology to be applied in natural gas desulfurization. However, droplet characteristics and principle in H2S selective absorption with N-methyldiethanolamine (MDEA) solution have seldom been fully investigated by experimental method. Therefore, a 3D Eulerian–Lagrangian approach has been established to investigate the droplet characteristics. The discrete phase model (DPM) is implemented to track the behavior of droplets, meanwhile the collision model and breakup model are employed to describe the coalescence and breakup of droplets. The simulation results indicate that rotating speed and radial position have a dominant impact on droplet velocity, average residence time and average diameter rather than initial droplet velocity. A short residence time of 0.039–0.085 s is credited in this study for faster mass transfer and reaction rate in RPB. The average droplet diameter decreases when the initial droplet velocity and rotating speed enhances. Restriction of minimum droplet diameter for it to be broken and an appropriate rotating speed have also been elaborated. Additional correlations on droplet velocity and diameter have been obtained mainly considering the rotating speed and radial position in RPB. This proposed formula leads to a much better understanding of droplet characteristics in RPB.
Keywords: rotating packed bed; natural gas desulfurization; droplet characteristic; Eulerian–Lagrangian approach; computational fluid dynamics rotating packed bed; natural gas desulfurization; droplet characteristic; Eulerian–Lagrangian approach; computational fluid dynamics
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MDPI and ACS Style

Wang, Z.; Wu, X.; Yang, T.; Wang, S.; Liu, Z.; Dan, X. Droplet Characteristics of Rotating Packed Bed in H2S Absorption: A Computational Fluid Dynamics Analysis. Processes 2019, 7, 724.

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