A model for predicting bubble rise velocity in a pulsed gas solid fluidized bed

Dong, Liang; Zhao, Yuemin; Z, Luo; Chen, Duan; Wang, Yingwei; Yang, Xuliang; Zhang, Bo

doi:10.1016/j.ijmst.2013.04.015

Cited by 37 publications

(15 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this study, we replaced the continuous air flow in ADMFB with an active pulsating air flow to generate a pulsing dense-phase gas–solid fluidized bed (PDGFB). − A vibrational energy is introduced into the fluidized bed using the vibration of the pulsating air flow. With this novel design, the pulsating air flow is expected to reduce the minimum fluidization velocity, modify the motion of heavy medium, decrease bubble size, and enhance the stability of the bed density.…”

Section: Introductionmentioning

confidence: 99%

Fluidization Characteristics of a Pulsing Dense-Phase Gas–Solid Fluidized Bed for High-Density Separation of Fine Anthracite

et al. 2016

Self Cite

View full text Add to dashboard Cite

Coal is one of the most important primary energy sources worldwide that requires an economic, effective, and clean preparation method. As the shortage of water resources increases, the wet beneficiation technology became questionable. The air dense medium fluidized bed (ADMFB) is a good alternative for dry coal beneficiation processes that require no water. In this account, a pulsating air flow was introduced into the ADMFB system to generate a pulsing dense-phase gas–solid fluidized bed (PDGFB). The effects of the pulsating air flow on the minimum fluidization velocity, stability of the bed density, and motion of the heavy medium were investigated. The pulsating air flow is shown to reduce the minimum of the fluidization velocity, modify the stability of the bed density, and regularize the motion of the heavy medium. Fine anthracite of −6 + 1 mm size is cleaned using PDGFB at elevated separation densities with a true value of 2.03 g/cm3 and probable error (E) of 0.09 g/cm3. In comparison to vibrated fluidized beds, PDGFB has no mechanical vibration and, hence, is advantageous in terms of the mechanical structure, easy operation, and susceptibility to lower failure.

show abstract

Section: Introductionmentioning

confidence: 99%

Fluidization Characteristics of a Pulsing Dense-Phase Gas–Solid Fluidized Bed for High-Density Separation of Fine Anthracite

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…In addition, it significantly reduces the environmental pollution due to the combustion of oil shale. [11][12][13] Because of the similarity between some of the physical properties of coal and oil shale, the separation method for coal cleaning can also be applied to the beneficiation of oil shale. [14,15] In the present study, oil shale particles of sizes <6 mm were separated using a compound dry separation apparatus.…”

Section: Introductionmentioning

confidence: 99%

Separation of <6 mm oil shale using a compound dry separator

et al. 2017

Separation Science and Technology

Self Cite

View full text Add to dashboard Cite

A large amount of fine granular materials (<6 mm) are produced during the mining of oil shale. The combustion characteristics of oil shale improve with decreasing size of these materials, for which reason fine-grain oil shale has a high utility value. However, fine oil shale also contains a significant amount of inorganic mineral impurities which can be reduced by physical separation to improve the oil quality. Based on an analysis of the physical properties of oil shale, this paper proposes a compound dry separation process for the cleaning of <6 mm oil shale grains. The effects of the vibration intensity, air velocity, and back angle of the employed separator on the separation results and oil content of the cleaned oil shale were systematically analyzed. Under the optimal vibrational conditions defined by a vibration intensity of 25.76 (amplitude = 4.0 mm, frequency = 40 Hz), air velocity of 0.66 m/s, and back angle of 45°, the yield comprised 35.8% concentrate and 64.2% tailings, with corresponding oil contents of 10.02% and 0.85%, respectively. The probable error of the highest intensity of segregation achieved was 0.155. The proposed compound dry separation of oil shale particles of up to 6 mm was found to be more efficient compared with conventional methods, and the separated fine grade material can be comprehensively utilized by further pyrolysis treatment. ARTICLE HISTORY

show abstract

“…Numerous coal cleaning technologies associated to de-watering [6][7][8][9][10] and de-ashing [11][12][13][14] processes have been proposed to sustainably utilize these lignites. However, most of them were not yet widely practiced by the power industry considering the high consumption of energy required during cleaning processes.…”

Section: Introductionmentioning

confidence: 99%