Process analysis of fine coal preparation using a vibrated gas-fluidized bed

Yang, Xuliang; Fu, Zhijie; Zhao, Jie; Zhou, Enhui; Zhao, Yuemin

doi:10.1016/j.powtec.2015.03.047

Cited by 33 publications

(11 citation statements)

References 25 publications

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“…gas-fluidized bed. The superficial air velocity (U) was found to have a more significant effect on the performance of density segregation, which is approximately consistent with the findings derived from the studies on VGFB cleaning [53]. The results proved that a moderate U at U/U mf = 2.0 could lead to optimal bubble size and particle movement which were in favor of the density segregation process.…”

Section: Gas-fluidized Bed Cleaningsupporting

confidence: 87%

“…Yang et al , , introduced vibration energy into a gas‐fluidized bed of Geldart D type particles in order to improve the fluidization behavior. In their study, an i‐Speed 3 high speed camera was adopted to examine the fluidization process.…”

Section: Density‐segregation Gas‐fluidized Bed Cleaningmentioning

confidence: 99%

“…In a conventional gas-fluidized bed, these particles are especially prone to form strong particulate force chains and then commence unfavorable fluidization phenomena such as channeling, dead zones, and large bubbles, leading to a poor performance of density segregation. Yang et al [53,56,57] introduced vibration energy into a gas-fluidized bed of Geldart D type particles in order to improve the fluidization behavior. In their study, an i-Speed 3 high speed camera was adopted to examine the fluidization process.…”

Section: Effects Of Vibration Energy and Cleaning Mechanismmentioning

confidence: 99%

“…As discussed above, the main unsolved problems associated with the recovery of fine medium solids hinders the development of the modified ADMFB cleaning. Some research works attempted to clean –6+1 mm fine coal based on the density segregation phenomenon in a gas‐fluidized bed. Density‐segregation gas‐fluidized bed cleaning does not use an external dense medium and clean coal fines depending on the difference in hindered settling velocities during fluidization.…”

Section: Density‐segregation Gas‐fluidized Bed Cleaningmentioning

confidence: 99%

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Dry Cleaning of Fine Coal Based on Gas‐Solid Two‐Phase Flow: A Review

Yang

Zhao

2017

Chem Eng & Technol

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Dry cleaning of coal becomes increasingly significant to improve energy efficiency and reduce air pollutant emissions. Fine coal dry cleaning processes are mostly based on gas‐solid two‐phase flow and mainly classified into the following three categories. Modified air‐dense medium‐fluidized bed cleaning has high cleaning accuracy, but confronts the problems of product purification and medium recovery. Density‐segregation gas‐fluidized bed cleaning does not use artificial medium solids and is characterized by a simple process and stable performance. However, its cleaning accuracy is relatively low. Air table cleaning also uses no artificial medium and separates fine coal depending on the differences in density and coefficient of friction. Its cleaning accuracy is approximate to that of density‐segregation gas‐fluidized bed cleaning but has more influential factors.

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Section: Gas-fluidized Bed Cleaningsupporting

confidence: 87%

Section: Density‐segregation Gas‐fluidized Bed Cleaningmentioning

confidence: 99%

Section: Effects Of Vibration Energy and Cleaning Mechanismmentioning

confidence: 99%

Section: Density‐segregation Gas‐fluidized Bed Cleaningmentioning

confidence: 99%

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Dry Cleaning of Fine Coal Based on Gas‐Solid Two‐Phase Flow: A Review

Yang

Zhao

2017

Chem Eng & Technol

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“…Luo et al [ 26 ] separated coal of 6−1 mm size fraction by use of air dense medium fluidized bed and analyze the particle force condition. Yang et al [ 27 , 28 ] used vibrated fluidized bed to separate coal of 6−3 and 3−1 mm size fractions without a dense medium. These abovementioned dry separation methods can effectively separate >0.5 mm fraction coal but present difficulty in separating <0.5 mm fraction coal and exhibit many limitations.…”

Section: Introductionmentioning

confidence: 99%

Separation Process of Fine Coals by Ultrasonic Vibration Gas-Solid Fluidized Bed

Wang

et al. 2017

International Journal of Analytical Chemistry

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Ultrasonic vibration gas-solid fluidized bed was proposed and introduced to separate fine coals (0.5–0.125 mm fraction). Several technological methods such as XRF, XRD, XPS, and EPMA were used to study the composition of heavy products to evaluate the separation effect. Results show that the ultrasonic vibration force field strengthens the particle separation process based on density when the vibration frequency is 35 kHz and the fluidization number is 1.8. The ash difference between the light and heavy products and the recovery of combustible material obtain the maximum values of 47.30% and 89.59%, respectively. The sulfur content of the heavy product reaches the maximum value of 6.78%. Chemical state analysis of sulfur shows that organic sulfur (-C-S-), sulfate-sulfur (-SO4), and pyrite-sulfur (-S2) are confirmed in the original coal and heavy product. Organic sulfur (-C-S-) is mainly concentrated in the light product, and pyrite-sulfur (-S2) is significantly enriched in the heavy product. The element composition, phase composition, backscatter imagery, and surface distribution of elements for heavy product show concentration of high-density minerals including pyrite, quartz, and kaolinite. Some harmful elements such as F, Pb, and As are also concentrated in the heavy product.

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Characterization of temporal and spatial distribution of bed density in vibrated gas-solid fluidized bed

Zhang

Dong

et al. 2018

Advanced Powder Technology

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Process analysis of fine coal preparation using a vibrated gas-fluidized bed

Cited by 33 publications

References 25 publications

Dry Cleaning of Fine Coal Based on Gas‐Solid Two‐Phase Flow: A Review

Dry Cleaning of Fine Coal Based on Gas‐Solid Two‐Phase Flow: A Review

Separation Process of Fine Coals by Ultrasonic Vibration Gas-Solid Fluidized Bed

Characterization of temporal and spatial distribution of bed density in vibrated gas-solid fluidized bed

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