Abstract
In view of the difficulty of traditional hydrocyclones to meet the requirements of fine classification, a double-overflow three-product (internal overflow, external overflow and underflow) hydrocyclone was designed in this study. Numerical simulation and experimental research methods were used to investigate the effects of double-overflow flow field characteristics and structural parameters (i.e., internal vortex finder diameter and insertion depth) on separation performance. The research results showed that the larger the diameter of the internal vortex finder, the greater the overflow yield and the larger the cut size. The finest internal overflow product can be obtained when the internal vortex finder is 30 mm longer than the external vortex finder. The separation efficiency is highest when the internal vortex finder is 30 mm shorter than the external vortex finder.
Highlights
A hydrocyclone is a device for sorting materials of either different particle sizes, densities, or both, by the principle of centrifugal sedimentation [1,2,3]
A large number of studies have been carried out on conventional single-overflow hydrocyclones, and consistent conclusions and research results have been obtained on the effects of structural parameters and operational parameters on the separation performance [37,38]
It is necessary to investigate the influence of the structural size of the internal vortex finder on the separation performance, in order to provide the basis and reference for the optimal design of the hydrocyclone with double-vortex finder
Summary
A hydrocyclone is a device for sorting materials of either different particle sizes, densities, or both, by the principle of centrifugal sedimentation [1,2,3]. Particles with small particle size and low density move under the action of centripetal buoyancy to the axis of lower pressure, forming an internal swirling flow in the spiral direction and are discharged from the overflow port [6]. Particles with large particle size and a high density move to the sidewall of the hydrocyclone under the action of centrifugal force, forming an external swirling flow spiraling downward along the wall of the hydrocyclone and discharging from the underflow port, thereby completing the separation process [7]. It is worth noting that the working principle of hydrocyclones determines that the separation process is not a complete separation [18] This will make the particles with sizes close to the cut size either enter the overflow or enter the underflow, resulting in the classification accuracy not meeting fine grading requirements [19]. The findings from the present study are expected to provide a theoretical basis and reference values for multi-product hydrocyclone separation processes and an insight into the hydrocyclone separation mechanism
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