Fluidization characteristics and fine coal dry beneficiation using a pronation-grille baffle dense phase medium fluidized bed

Zhou, Enhui; Zhao, Yuemin; Chen, Duan; Yang, Xuliang; Yu, Xi; Li, Guofeng; Liufeng, Yongzheng; Fan, Xuchen; Zhang, Yadong

doi:10.1016/j.fuel.2016.08.029

Cited by 22 publications

(10 citation statements)

References 30 publications

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“…Because magnetite powder can be easily recovered and reused, it is primarily used for coal beneficiation in the gas-vibro fluidized bed. The bed density normally ranges from 1.8 to 2.3 g/ cm 3 if magnetite powder is used as the dense medium. As shown in Figure 2, due to the high bed density in a monodisperse particle system, it is necessary to investigate a method for decreasing separation density in the gas-vibro fluidized bed.…”

Section: Experimental System and Materialsmentioning

confidence: 99%

“…Meanwhile, the average ash content of coal with −1.6 g/cm 3 is 4.30%. In addition, coal with a density of −1.6 g/cm 3 accounts for the highest proportion, 72.53% of all samples. The aim of coal separation is to decrease the ash content to about 5%, while the separation density should be maintained near 1.6 g/cm 3 .…”

Section: Acs Omegamentioning

confidence: 99%

“…In addition, coal with a density of −1.6 g/cm 3 accounts for the highest proportion, 72.53% of all samples. The aim of coal separation is to decrease the ash content to about 5%, while the separation density should be maintained near 1.6 g/cm 3 . Therefore, we also attempted to explore the possibility of separation at a lower density in the gasvibro fluidized bed.…”

Section: Acs Omegamentioning

confidence: 99%

“…2 Gravity methods, such as cyclone and dense medium separation system, still play a crucial role in coal cleaning. 3−6 However, water shortage is an important problem in the western arid regions of China. In addition, investments are another factor for consideration when evaluating the technical feasibility.…”

Section: Introductionmentioning

confidence: 99%

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Studies on Bed Density in a Gas-Vibro Fluidized Bed for Coal Cleaning

et al. 2019

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Dry coal beneficiation has played a vital role during the initial stage of coal cleaning in recent years. Successful utilization of a gas–solid fluidized bed for >6 mm coal cleaning motivates scholars to explore the possibility of fine coal cleaning using dry beneficiation methods. In this study, pulsed flow was introduced into a fluidized bed to optimize bubble behavior, thus improving the density stability. The equation of minimum fluidization velocity ( U mfp ) in a gas-vibro fluidized bed for coal preparation was investigated theoretically. An equation has been proposed for predicting U mfp while considering changes in the friction coefficient ( C f ) in the gas-vibro fluidized bed. Based on two-phase theory, the correlation of bed density was determined by analyzing the bubble behavior in the gas-vibro fluidized bed. The theoretical bed density was then compared with experimental data of the bed density and separation density. The predicted bed density in monodisperse and binary dense medium systems was found to be consistent with the experimental results. Overall, the equation of bed density is suitable for estimating the separation density in the gas-vibro fluidized bed.

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Section: Experimental System and Materialsmentioning

confidence: 99%

Section: Acs Omegamentioning

confidence: 99%

Section: Acs Omegamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Studies on Bed Density in a Gas-Vibro Fluidized Bed for Coal Cleaning

et al. 2019

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“…However, fluidized bed reactors in the turbulent fluidization regime also have some inherent drawbacks like a high degree of gas solids back‐mixing with wide residence time distributions . As shown in Figure a, the performance of the first‐order reaction in a plug flow reactor (PFR) and mixed flow reactor (MFR) is compared .…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous catalysis in multi‐stage fluidized bed reactors: From fundamental study to industrial application

et al. 2019

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The multi-stage fluidized bed (MSFB) reactor with several stages connected in series prevents gas and solids back-mixing effectively and obtains the plug-flow reactor performance. Besides, different process steps can be accomplished in a single reactor by establishing different temperatures and/or concentrations in each stage. Therefore, multi-stage fluidized bed reactors are acknowledged as novel and flexible multi-phase flow reactors for heterogeneous catalytic processes, especially with the intermediates as the desired products. Typical process developments in the industry involve the methanol to aromatics (MTA), regeneration in fluid catalytic cracking (FCC), and hydrogenation of nitrobenzene to aniline. The purpose of this article is to provide a comprehensive review of the fundamental research as well as particular industrial applications on multi-stage fluidized bed reactors in the Fluidization Laboratory of Tsinghua University (FLOTU).

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Discrete element study of bubble behaviors in Type D particle fluidization with and without interparticle cohesive forces

Tian

Mei

2018

Granular Matter

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Fluidization characteristics and fine coal dry beneficiation using a pronation-grille baffle dense phase medium fluidized bed

Cited by 22 publications

References 30 publications

Studies on Bed Density in a Gas-Vibro Fluidized Bed for Coal Cleaning

Studies on Bed Density in a Gas-Vibro Fluidized Bed for Coal Cleaning

Heterogeneous catalysis in multi‐stage fluidized bed reactors: From fundamental study to industrial application

Discrete element study of bubble behaviors in Type D particle fluidization with and without interparticle cohesive forces

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