Study on the distribution characteristics of flexible filamentous particle clusters in a fluidized bed dryer

Wu, Kai; Li, Bin; Gao, Linyu; Yuan, Zhulin; Luo, Dongmei; Guan, Lei; Gu, Conghui

doi:10.1016/j.powtec.2018.02.040

Cited by 18 publications

(3 citation statements)

References 19 publications

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“…Although talcum powder is lubricious and extremely unstable, a spiral particle deposition zone is formed on the inner wall of the 1st-cyclone cylinder. It strongly shows the phenomenon of particle clustering during particle separation similar to the results observed in the literature and the simulation results. − The particle deposition area formed around the two-stage cyclone base plate and the particle deposition area formed by the bottom plate center hopper are also similar to the simulation results.…”

Section: Resultssupporting

confidence: 84%

Effect of Inlet Air Volumetric Flow Rate on the Performance of a Two-Stage Cyclone Separator

2018

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It is very important to improve the cyclone separator separation efficiency for fine particles. On the basis of the Reynolds stress model (RSM), a new two-stage cyclone separation device is modeled and the model is simulated under six kinds of air volumetric flow rate conditions. The two-stage cyclone separator was then tested in the laboratory and the experimental data were compared with the simulation data. The results show that the RSM model can predict the performance of the two-stage cyclone separation device with high accuracy. Increasing of the air volumetric flow rate can not only improve the separation efficiency of the two-stage cyclone separator, but also effectively change the classification range. Because of the centrifugal force, even if the pressure drop is low, the 1st-cyclone can completely separate particles above 5.0 μm. When the air volumetric flow rate is more than 290 m 3 /h, the 2nd-cyclone can effectively separate the particles below 2.0 μm. The study also confirmed the nonlinear relationship between the pressure drop and the cut-off particle size and the maximum particle size. When the pressure drop exceeds a certain value, there is no longer any effect on the cut-off particle size and the maximum particle size.

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Section: Resultssupporting

confidence: 84%

Effect of Inlet Air Volumetric Flow Rate on the Performance of a Two-Stage Cyclone Separator

2018

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“…In this study, the grey‐scale value of a certain pixel is the average of a certain range X around the pixel. The pixel grey‐scale parameter (Gr) in the selected range is defined as follows [ 43 ] :

Gr = \frac{δ_{\max} - δ_{a}}{δ_{\max} - δ_{\min}}

where δ max and δ min are the maximum grey‐scale value and the minimum grey‐scale value, respectively, and δ a presents the average grey value in the range X. When the grey‐scale parameter (Gr) is larger than thresholding value (Ft), the pixel or pixels can be regarded as the bubble point.…”

Section: Bubble Identification Methodsmentioning

confidence: 99%

“…In this study, the grey-scale value of a certain pixel is the average of a certain range X around the pixel. The pixel grey-scale parameter (Gr) in the selected range is defined as follows [43] :…”

Section: Bubbles Identificationmentioning

confidence: 99%

Bubble behaviour investigation in a wet fluidized bed using digital image analysis

Yuan

Guan

et al. 2021

Can J Chem Eng

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Due to the presence of liquid bridge forces, wet particles reveal totally different fluidization behaviours than dry fluidized beds. This paper studies the bubble dynamics of wet Geldart‐D particles in a wet 2D fluidized bed. A digital image analysis method is adopted to identify bubbles and extract bubble properties based on MATLAB software. During fluidization, the bubble feature analysis of optimized binary images captures the bubble size variation, bubble fraction, and bubble shape. The results show that the increasing liquid saturation promotes the gas holding capacity of the emulsion phase, leading to the decreasing bubble fraction. When the particle size grows, the stability of the emulsion phase is promoted and hence the average bubble diameter increases. As the liquid saturation increases, the enhancing liquid bridge forces limit the bubble growth and promote the bubble breakage, which contributes to the small bubbles. With respect to the wet particles, of which the diameter is 1 mm and the liquid saturation is over 15%, slugging is likely to be observed, resulting in the increasing equivalent bubble diameter. The growing liquid saturation increases the wide aspect ratio, decreases the shape factor, and disperses the dependence between the two parameters. This indicates that small and irregular bubbles are likely to be seen in wet fluidized beds.

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Clusters identification and meso-scale structures in a circulating fluidized bed based on image processing

Yin

Zhong

Song

et al. 2019

Advanced Powder Technology

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Study on the distribution characteristics of flexible filamentous particle clusters in a fluidized bed dryer

Cited by 18 publications

References 19 publications

Effect of Inlet Air Volumetric Flow Rate on the Performance of a Two-Stage Cyclone Separator

Effect of Inlet Air Volumetric Flow Rate on the Performance of a Two-Stage Cyclone Separator

Bubble behaviour investigation in a wet fluidized bed using digital image analysis

Clusters identification and meso-scale structures in a circulating fluidized bed based on image processing

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