Influence of bubbles on the segregated stability of fine coal in a vibrated dense medium gas–solid fluidized bed

Zhou, Enhui; Zhang, Yadong; Zhao, Yuemin; Tian, Qingqing; Chen, Zengqiang; Lv, Guannan; Yang, Xuliang; Dong, Liang; Chen, Duan

doi:10.1016/j.partic.2021.03.018

Cited by 14 publications

(3 citation statements)

References 31 publications

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“…Gravity separation is one of the main methods used for coal separation. It includes heavy medium [ 2 , 3 ], water medium [ 4 , 5 ], and air medium [ 6 , 7 ] separation. The water-medium separation methods include jigging separation [ 8 ], coarse slime interference bed separation (TBS) [ 9 ], and the spiral separation technique [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Research on prediction of coal water medium separation effect based on multi-models

Chen,

Wang,

Wang

et al. 2024

Heliyon

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Section: Introductionmentioning

confidence: 99%

Research on prediction of coal water medium separation effect based on multi-models

Chen,

Wang,

Wang

et al. 2024

Heliyon

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“…They discovered that the movement characteristics of bubbles significantly influence the separation effect of fine-grained coal. Moreover, vibration has been found to reduce the size of bubbles, which in turn enhances the separation of fine-grained coal [14]. Based on this, the researchers delved deeper into the inhibitory effects of vibration energy on bubbles and proposed an assessment of vibration for enhancing the quality of bed fluidization [8,15].…”

Section: Introductionmentioning

confidence: 99%

Study on the Separation and Mixing Characteristics of Wide-Grained Dense Medium in Vibration Separation Fluidized Bed

Fan,

Guo,

Guo

et al. 2023

Preprint

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Vibro-fluidized dry coal beneficiation involves the unavoidable mixing of -1 mm coal dust into the fluidized bed, which compromises the stability and homogeneity of the bed density and reduces the effectiveness of fine-grained coal separation. In order to understand the features of coal powder separation and mixing (-1 mm) in a vibrating fluidized bed, as well as to achieve a uniform and stable bed density, a wide-grained dense medium consisting of -1 mm coal dust and 0.3-0.15 mm magnetite powder was homogeneously mixed in this work. The degree of density separation in the entire bed was examined, as well as the local mixing properties of the Wide-grained Dense Medium. It was discovered that when low vibrational energy was introduced at the same gas velocity, particle separation was enhanced in comparison to the usual fluidized bed. Little bubbles were found to ensnare fine coal dust and migrate upward, increasing density separation. The introduction of high vibrational energy leads to particle disorder within the bed and an increase in the level of particle mixing. The beneficial effects of vibration on the bed are diminished when the gas velocity is gradually increased under specified vibration circumstances. This causes big bubbles to develop more frequently, which increases particle mixing. Among them, the 1-0.5 mm fine-grained coal exhibits the best mixing state; it is less impacted by variations in air velocity and vibration levels, whereas the -0.5 mm coal dust is more affected by each of these variables. Furthermore, a wide range of air velocity regulation without a significant segregation state change was discovered to be achievable by the particle system under vibration circumstances of f=25Hz A=1mm and f=25Hz A=2mm.

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“…Finally, the internal stability of the fluidized bed with Geldart B particles is poor, and bubble movement is irregular [34]. Furthermore, the height of traditional fluidized beds is lower than 30 mm, which means there is not enough space for the expansion of the emulsion phase [35][36][37]. Therefore, the separation efficiency can be further improved.…”

Section: Introductionmentioning

confidence: 99%

Estimation of Bed Expansion and Separation Density of Gas–Solid Separation Fluidized Beds Using a Micron-Sized-Particle-Dense Medium

Fan

Zhou

2021

Separations

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Coal is the dominant energy resource in China. With the Chinese policy of committing to reducing peak carbon dioxide emissions and achieving carbon neutrality, coal separation has recently become a hot topic, especially the fluidized separation of fine particles. In this study, micron-sized particles were introduced to ameliorate the properties of the traditional fluidized bed. The expansion characteristics of the micron-sized-particle-dense medium were explored. A bed expansion prediction model of the micron-sized-particle-dense medium was established, and the prediction error was about 10%, providing a theoretical basis for understanding the distribution characteristics of the bed. This model also helped predict the bed density in the presence of a micron-sized-particle-dense medium, and the prediction accuracy was between 85% and 92%, providing a theoretical basis for selecting and popularizing fluidized beds for industrial separation.

show abstract

Influence of bubbles on the segregated stability of fine coal in a vibrated dense medium gas–solid fluidized bed

Cited by 14 publications

References 31 publications

Research on prediction of coal water medium separation effect based on multi-models

Research on prediction of coal water medium separation effect based on multi-models

Study on the Separation and Mixing Characteristics of Wide-Grained Dense Medium in Vibration Separation Fluidized Bed

Estimation of Bed Expansion and Separation Density of Gas–Solid Separation Fluidized Beds Using a Micron-Sized-Particle-Dense Medium

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