Modeling and experimental studies of mass transfer in the cavity zone of a rotating packed bed

Sang, Le; Luo, Yong; Chu, Guang‐Wen; Liu, Ya-Zhao; Liu, Xing-Zheng; Chen, Jianfeng

doi:10.1016/j.ces.2016.12.041

Cited by 54 publications

(42 citation statements)

References 26 publications

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“…A 3D CFD Eulerian-Lagrangian approach has been built by introducing a droplet breakup and coalescence model to investigate the droplet characteristics of RPB in H 2 S selective absorption into MDEA solution. Droplet characteristics such as droplet velocity, average residence time and average diameter in RPB have been analyzed by diagrams and correlations, which are compared with available experimental data in the literature [14,17]. The results show that the velocity increases with increasing rotating speed and radial position, but the opposite conclusion is made on the average residence time.…”

Section: Discussionmentioning

confidence: 99%

“…In the packing zone, the rotating speed is dominant for droplet velocity increasing and it illustrates that the droplet velocity increases along with rotating speed increasing. As a consequence, Equation (33) for predicting droplet velocity in RPB is proposed by considering the influence of initial droplet velocity, rotating speed and radial position; validation Equation (34), predicted from Sang [14], is implemented. Finally, the mathematic expression declares that rotating speed and radial position have the main impacts on droplet velocity.…”

Section: Effect Of Initial Droplet Velocity On Droplet Velocitymentioning

confidence: 99%

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

Wang

Yang

et al. 2019

Processes

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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.

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Section: Discussionmentioning

confidence: 99%

Section: Effect Of Initial Droplet Velocity On Droplet Velocitymentioning

confidence: 99%

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

Wang

Yang

et al. 2019

Processes

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“…The majority of liquid inside the packing zone under the high‐gravity environment existed as dispersed droplets by the strong shear and impingement of packing fibers based upon previous imaging studies of liquid flow in a RPB . Because droplets from the outer edge of the packing move into the cavity zone and impact upon the inner wall of the casing, lots of mother liquid droplets flows in the cavity zone, and liquid films would form on the inner wall of the casing and daughter droplets were generated in the cavity zone . The surface areas of droplets in the three zones and surface area of liquid film on the inner wall of the casing were therefore regarded as the gas–liquid effective interfacial area. The gas behavior, such as the gas flow, gas temperature, gas viscosity, and gas composition almost has no effect on the shape and flow path of liquid flow pattern.…”

Section: Model Developmentmentioning

confidence: 99%

“…24 Because droplets from the outer edge of the packing move into the cavity zone and impact upon the inner wall of the casing, lots of mother liquid droplets flows in the cavity zone, and liquid films would form on the inner wall of the casing and daughter droplets were generated in the cavity zone. 25 The surface areas of droplets in the three zones and surface area of liquid film on the inner wall of the casing were therefore regarded as the gas-liquid effective interfacial area.…”

Section: Introductionmentioning

confidence: 99%

A three‐zone mass transfer model for a rotating packed bed

et al. 2019

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A rotating packed bed (RPB) is recognized for its merits in chemical process intensification. In most studies of RPB mass transfer modeling, however, the effects of the end and cavity zones have not been taken into consideration, since it was very difficult to distinguish the end and bulk zones by hydrodynamics and mass transfer process. In this work, the radial thickness of the end zone was obtained by developing a probability method and imaging experiments to separate the end and bulk zones. A three-zone model, including end, bulk, and cavity zones, of the overall gas-side volumetric mass transfer coefficient (K G a)t was first established. Experiments of dissolved MEA chemisorption of CO 2 were carried out to validate the proposed three-zone mass transfer model. The results of the MEA-CO 2 absorption experiments showed that the experimentally obtained values of CO 2 absorption efficiency were in agreement within ±20% with the model predictions.

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“…contributes to the majority of mass transfer and mixing efficiency. 6 It is of great importance to elucidate the liquid flow behaviors in the packing zone for a profound understanding of the mass transfer and mixing process in a RPB reactor.…”

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confidence: 99%

Liquid jet impaction on the single‐layer stainless steel wire mesh in a rotating packed bed reactor

Liu

et al. 2019

AIChE Journal

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Liquid flow behaviors in the packing zone of a rotating packed bed reactor significantly affect the mass transfer performance. However, the interaction between the rotating packing and liquid is still not clear, due to packing's complex structure. In this work, liquid jet impaction on a rotating single-layer wire mesh was investigated to clarify the interaction and liquid flow behaviors after the impaction was observed and analyzed by visualization and simulation methods. Visual experiments showed that the interaction could be divided into the shearing action generated by vertical fibers and carrying action generated by horizontal fibers of wire mesh. A dimensionless number β was introduced as a criterion to evaluate the influence of these actions on the liquid dispersion. Simulation results agreed well with the experimental results of liquid dispersion. Dynamic liquid film behaviors on the fiber surface were further simulated and the average film thickness was 21-32 μm.

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Modeling and experimental studies of mass transfer in the cavity zone of a rotating packed bed

Cited by 54 publications

References 26 publications

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

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

A three‐zone mass transfer model for a rotating packed bed

Liquid jet impaction on the single‐layer stainless steel wire mesh in a rotating packed bed reactor

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