Numerical Study on the Separation Performance of Hydrocyclones with Different Secondary Cylindrical Section Diameters

Hou, Duanxu; Liu, Peikun; Zhao, Qiang; Jiang, Lanyue; Cui, Baoyu; Wei, Dezhou

doi:10.3390/pr11092542

Cited by 4 publications

(1 citation statement)

References 44 publications

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“…In recent years, computational fluid dynamics (CFD) has been widely used in the design and optimization studies of classifiers [22,23]. In simulating particle motion, discrete phase model (DPM) and discrete element method (DEM) are commonly used.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study of a Pusher Feed Classifier Based on RNG-DPM Method

Zhou,

Zou,

et al. 2024

Processes

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The classifier is an essential tool for the development of contemporary engineering technology. The application of classifiers is to categorize mixed-sized particles into multi-stage uniform particle sizes. In current studies, the particles in the classifier obtain their initial velocity when feeding. The classification effect is impacted by the inability to precisely control the initial state of the particles. To solve this problem, a pusher feed classifier was designed in this study, and a numerical simulation was performed to investigate its flow field characteristics and classification performance using the RNG-DPM method. A pusher is utilized to achieve particle feeding without initial velocity and to precisely control the initial state of the particles in the classification flow field. A newly developed two-way air inlet structure is designed to provide a superimposed flow field and enable the five-stage classification. Our results show that this pusher feed classifier has the best classification effect when the vertical airflow velocity is 10 m/s and the horizontal airflow velocity is 3 m/s. Meanwhile, the classification size ratio (CSR) from outlet 1 to outlet 5 was 1.24, 0.55, 0.45, 0.39, and 0.15, respectively.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study of a Pusher Feed Classifier Based on RNG-DPM Method

Zhou,

Zou,

et al. 2024

Processes

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Effect of Operational and Geometric Variables in Hydrocyclones to Improve Separation Efficiency and Reduce Energy Consumption: A Review and New Insights

de Sa da Silva,

Morimoto,

de Oliveira Silva

et al. 2024

Mineral Processing and Extractive Metallurgy Review

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Design Methodology for a Low-Shear Rotating Swirler

Si,

Ji,

Chen

et al. 2023

Separations

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The tubular dynamic hydrocyclone (TDH) holds great potential for the pre-deoiling of offshore oil platforms. However, the shear and turbulence in the flow field can cause the oil droplets, the dispersed phase in water, to break up when the swirling flow is produced by the swirler. A design method is proposed for the low-shear rotary swirler (LSRS) of TDH, the aim of which is to reduce the shear force and local turbulence during the fluid forming swirling flow. The blade setting angle of the LSRS is calculated based on the relative velocity vector between the fluid and the swirler. The distribution characteristics of the tangential velocity and turbulence in the TDH with LSRS are simulated by Computational Fluid Dynamics (CFD). The maximum stable droplet diameter is analyzed. The results show that the shear stress and turbulence energy dissipation rates are reduced by 74.6% and 68.5%, respectively, and that the stable droplet diameter is increased by more than 60%, compared to the conventional rotating swirler. In addition, a TDH prototype with LSRS was tested in an offshore oil field by continuous operation for more than 36 h. The average separation efficiency was 83%, and the average underflow oil concentration was 27 mg/L. The research also found that the drastic changes in the tangential velocity along the axial direction were critical to shear. Moreover, the results make up for the deficiency of the spatial variation of the tangential velocity in the dynamic cyclone separator.

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Numerical Study on the Separation Performance of Hydrocyclones with Different Secondary Cylindrical Section Diameters

Cited by 4 publications

References 44 publications

Numerical Simulation Study of a Pusher Feed Classifier Based on RNG-DPM Method

Numerical Simulation Study of a Pusher Feed Classifier Based on RNG-DPM Method

Effect of Operational and Geometric Variables in Hydrocyclones to Improve Separation Efficiency and Reduce Energy Consumption: A Review and New Insights

Design Methodology for a Low-Shear Rotating Swirler

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