Effects of bottom profile on the circulation and classification of particles in cylindrical hydrocyclones

Hou, Dong; Zhao, Q.; Liu, Peikun; Jiang, Lanyue; Cui, Baoyu; Wei, Dezhou

doi:10.1016/j.apt.2023.104050

Cited by 7 publications

(4 citation statements)

References 27 publications

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“…The flow field is the carrier of particle movement; changes in the structure of the cone-plate of the cyclone clarifier will inevitably cause changes in the behavior of the flow field, thus affecting cyclone separation of the particles [25,26]. Therefore, the effect of structural changes in the cone-plate of the cyclone clarifier on the flow field is first analyzed.…”

Section: Flow Fieldmentioning

confidence: 99%

Effect of Cone-Plate Radius on the Separation Performance of Cyclone Clarifier

Zhang,

Bai,

Xiao

et al. 2024

Water

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In order to further reduce the number of particles in the overflow port of a cyclone clarifier, a cone-plate structure with an equiproportionally varying cone-plate radius is proposed. This includes two structures, namely, an equal–proportional gradually shrinking cone-plate radius and an equal–proportional gradually expanding cone-plate radius. In this paper, numerical simulation is used to comparatively study the flow field characteristics and particle separation inside the traditional equal radius, the gradually shrinking radius, and the gradually expanding radius cone-plate cyclone clarifier. The simulation results show that compared with the traditional equal radius cone-plate structure, the gradual shrinking of the cone-plate structure, due to the bottom of the cone-plate radius being small, can better give full play to the cone-plate settling capacity. The gradually expanding cone-plate cyclone clarifier, due to the bottom of the cone-plate radius being large, results in more fine particles entering the overflow pipe and being discharged from the overflow port. Compared with the traditional cone-plate cyclone clarifier, the gradually shrinking cone-plate cyclone clarifier has a significant increase in the removal efficiency of particles of different sizes than the traditional cyclone clarifier overflow port. The removal efficiency of all particles at the overflow of the gradually shrinking cyclone clarifier was increased by 10.32% compared to the conventional cone-plate cyclone clarifier.

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Section: Flow Fieldmentioning

confidence: 99%

Effect of Cone-Plate Radius on the Separation Performance of Cyclone Clarifier

Zhang,

Bai,

Xiao

et al. 2024

Water

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“…Our team’s previous research suggests that a flat-bottomed structure contributes to the suppression of the bypass effect and the reduction in the mismatch of fine particles in underflows; moreover, coarse particles misplacement in overflow can be alleviated by optimizing the bottom wall to regulate the circulation flow of particles. Accordingly, a two cylindrical section hydrocyclone is proposed in terms of regulating the particle circulation flow, and further demonstrates that its separation effect is superior to flat-bottomed hydrocyclones. , Hence, exploring the effect of structural parameters on the separation performance of the two cylindrical section hydrocyclones based on the current work and carrying out structural optimization to further improve its separation performance are the priority of the current work.…”

Section: Introductionmentioning

confidence: 99%

“…Accordingly, a two cylindrical section hydrocyclone is proposed in terms of regulating the particle circulation flow, and further demonstrates that its separation effect is superior to flat-bottomed hydrocyclones. 26 , 27 Hence, exploring the effect of structural parameters on the separation performance of the two cylindrical section hydrocyclones based on the current work and carrying out structural optimization to further improve its separation performance are the priority of the current work.…”

Section: Introductionmentioning

confidence: 99%

Study on the Separation Performance of a Two Cylindrical Section Hydrocyclone under Various Height Ratios

Liu,

Chen,

Hou

et al. 2024

ACS Omega

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Two cylindrical section hydrocyclones can suppress particle misplacement by regulating the circulation flow, but few researchers have investigated the effect of the cylindrical height ratio. In this paper, numerical simulations and physical tests were conducted to investigate the effect of height ratio on the particle motion behavior and separation performance of the two cylindrical section hydrocyclone. According to the numerical simulation results, with increasing height ratio, the separation cut size decreased, the separation accuracy and recovery rate of medium and coarse particles in the underflow increased, the coarse particle misplacement in overflow decreased significantly, and the proportion of medium particle circulation flow gradually increased. According to the test results, the number of misplaced fine particles in underflow could be effectively reduced when H 1 /H 0 = 0.30. With increasing height ratio, the number of misplaced coarse particles in the overflow decreased and the classification efficiency of fine particles increased. The maximum separation efficiencies of medium and coarse particles could be obtained at H 1 /H 0 values of 0.47 and 0.17, respectively. Therefore, increasing the height ratio could inhibit coarse particle misplacement in overflow and improve the separation performance of two cylindrical section hydrocyclones.

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“…Tian et al [25] designed a hydrocyclone with a flowback device, and simulations found that with increasing underflow back pressure, the resistance of particles discharged through the spigot increases and the underflow flow ratio decreases. Hou et al [26,27] analyzed the feasibility of a flat-bottomed structure based on the theory of recirculating flow and researched the effects of the bottom contour and top opening size of hydrocyclone separation columns. Pathak et al [28] conducted experiments and found that an expanding spigot structure could effectively alleviate the roped discharging phenomenon under the condition of coarse-grained and high-concentration feeding.…”

Section: Introductionmentioning

confidence: 99%

Designing the Spigot Structure of Hydrocyclones to Reduce Fine Particle Misplacement in Underflow

Liu,

Chen,

Hou

et al. 2024

Water

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Hydrocyclones can be used to concentrate the entrained sands in sewage and alleviate the clogging and erosion of the drainage network, but in practical application, there are problems such as low concentrations of underflow and a high content of fine particles, which cause a significant load on the subsequent sand dewatering and recycling. This paper designs five spigot structures of hydrocyclones and investigates the separation performance by numerical simulation, aiming to improve the applicability of hydrocyclones in the sewage treatment process by optimizing the spigot structure. The research results show that a large cone spigot delays the external downward swirling flow and reduces fine particle content in the underflow, but its effective separation space is reduced, and the turbulence in the cone section area is more intensive, which influences the separation accuracy. An elongated spigot has a reduced underflow water distribution; fine particles are more enriched in the internal swirling flow, and the underflow recoveries of 1 μm and 5 μm particles drop by 2.34% and 2.31%. The spigot structure affects the downward fluid and air intake states; complicated spigot structures contribute to increasing the resistance of particle discharge through underflow, alleviating fine particle misplacement.

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Effects of bottom profile on the circulation and classification of particles in cylindrical hydrocyclones

Cited by 7 publications

References 27 publications

Effect of Cone-Plate Radius on the Separation Performance of Cyclone Clarifier

Effect of Cone-Plate Radius on the Separation Performance of Cyclone Clarifier

Study on the Separation Performance of a Two Cylindrical Section Hydrocyclone under Various Height Ratios

Designing the Spigot Structure of Hydrocyclones to Reduce Fine Particle Misplacement in Underflow

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