Model-based experimental data evaluation of separation efficiency of multistage coarse particle classification in a zigzag apparatus

Mann, Hannes; Roloff, Christoph; Hagemeier, Thomas; Thévenin, Dominique; Tomas, Jürgen

doi:10.1016/j.powtec.2017.03.003

Cited by 16 publications

(18 citation statements)

References 16 publications

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“…Therefore, the particles are almost perfectly spherical. The particle density is specified by the manufacturer, ρ s = 2500 kg/m 3 .…”

Section: Glass Beadsmentioning

confidence: 99%

“…The estimation of the experimental grade efficiency values based on the experimental results is described in section 4. 3. The fit of the model to the experimental results is described in section 4.…”

Section: Separation Modelmentioning

confidence: 99%

“…The ZZS has a broad range of applications. It can be used to separate particulate materials based on different properties, such as size [1][2][3], density [4], and shape [5]. For instance, the ZZS is used for the separation and recycling of municipal waste [6], building rubble [4], shredded lithium-ion batteries [7] and thermoset composites [5].…”

Section: Introductionmentioning

confidence: 99%

“…the number, the bend angle, the depth, the width, and the length of the channel segments [6,8], the composition of the separated material [6,9,10], as well as the operating process parameters, such as the air velocity in the channel, and the mass stream of feed material [3,9,10]. Despite the particle loading having a significant effect on grade efficiency, only a few authors have analysed its effect for their specific experimental setup [3,9,11,12]. No good estimate of the particle loading for the separation with high feed mass stream is provided or incorporated in any of the current models.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of the grade efficiency of a zigzag separator

et al. 2020

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An experimental study is conducted on a pilot-scale zigzag air separator (ZZS) to study the effects of varying the solid feed mass stream, the mean channel air velocity, and the number of channel segments onto the grade efficiency. Spherical glass beads are classified. A straight pipe separator model (PSM) is modified for the ZZS and fitted to the experimental data to estimate the relative cutpoint settling velocity, the separation sharpness, the relative rise velocity, the diffusion coefficient, and the particle loading. The proposed model is thoroughly investigated with regard to all important parameters, e.g. the estimated particle loading is shown to be more precise than the ratio of the solid and air mass stream, used in many publications. Finally, the relative rise velocity is shown to be only a function of the particle loading, making the experimental results within the model collapse.

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“…Therefore, the particles are almost perfectly spherical. The particle density is specified by the manufacturer, ρ s = 2500 kg/m 3 .…”

Section: Glass Beadsmentioning

confidence: 99%

Section: Separation Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of the grade efficiency of a zigzag separator

et al. 2020

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“…Further development of such devices was presented by zigzag pneumatic classifiers [8,9], wherein centrifugal forces arise due to the gas flow turns, causing particle circulation. This effect reduces flow density and, consequently, increases the efficiency of the classification process.…”

Section: Literature Reviewmentioning

confidence: 99%

Ensuring the Reliability of Pneumatic Classification Process for Granular Material in a Rhomb-Shaped Apparatus

et al. 2019

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This article is devoted to a detailed description of the developed physical model of the pneumatic classification process for detecting the rotating suspended layer and ensuring the frequency of loading and unloading of a pneumatic classifier. The related mathematical model is developed for estimating the non-stationary concentration of fine particles in a gas-dispersed flow with respect to time and height of the working space of the apparatus. The research is aimed at developing a pneumatic classification method for granular materials using a rhomb-shaped apparatus and ensuring the reliability of the operating process based on the influence of the flow on the granular material concentrations. The obtained experimental results allow evaluating the rational geometrical parameters of the working space in pneumatic granulators, as well as verifying the proposed mathematical model based on the implementation of the quasi-linear regression procedure. It is shown that the rhomb-shaped pneumatic classifier provides effective separation of granular material, reaching up to 95% of the target fraction. As a result, the proposed methodology can be implemented for optimizing geometrical profiles of pneumatic classifiers in terms of defining the required technological parameters of the pneumatic classification process.

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