Prediction of cluster diameter for a wide range of particles for gas–solid dispersed phase in a fast fluidized‐bed reactor

Das, Mitali; Meikap, B.C.; Saha, Ranajit

doi:10.1002/apj.131

Cited by 6 publications

(2 citation statements)

References 19 publications

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“…As can be seen, above 1.76 to 2.26 m riser height, the apparent and real voidage profiles merge together. A similar results were reported by Das et al for prediction of cluster diameter calculation.…”

Section: Acceleration Lengthsupporting

confidence: 90%

Voidage and Pressure Profile Characteristics of Sand−Iron Ore−Coal−FCC Single-Particle Systems in the Riser of a Pilot Plant Circulating Fluidized Bed

Das

Meikap

Saha

2008

Ind. Eng. Chem. Res.

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Hydrodynamic behaviors of single system of particles were investigated in a circulating fluidized bed (CFB) unit. Particles belonging to Geldart groups A and B like sand of various sizes (80, 300, 417, 522, 599, and 622 µm), FCC catalyst (120 µm), iron ore (166 and 140 µm), and coal (335 and 168 µm) were used to study the hydrodynamic characteristics. Superficial air velocity used in the present study ranged between 2.01 and 4.681 m/s and corresponding mass fluxes were 12.5-50 kg/(m 2 s). A CFB needs the creation of some special hydrodynamic conditions, namely a certain combination of superficial gas velocity, solids circulation rate, particle diameter, density of particle, etc. which can give rise to a state wherein the solid particles are subjected to an upward velocity greater than the terminal or free fall velocity of the majority of the individual particles. The hydrodynamics of the bed was investigated in depth and theoretical analysis is presented to support the findings. Based on gas-solid momentum balance in the riser, a distinction between apparent and real voidage has been made. The effects of acceleration and friction on the real voidage have been estimated. Results indicated a 0.995 voidage for higher superficial gas velocity of 4.681 m/s.

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Section: Acceleration Lengthsupporting

confidence: 90%

Voidage and Pressure Profile Characteristics of Sand−Iron Ore−Coal−FCC Single-Particle Systems in the Riser of a Pilot Plant Circulating Fluidized Bed

Das

Meikap

Saha

2008

Ind. Eng. Chem. Res.

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“…fluidized bed chemical looping combustion1, 2 and fluidized bed membrane reactors,3 have become interest. The rapid increase of research interests on combustion and other new utilization of solid fuels in fluidized beds has highlighted needs for further exploring and understanding the basic physics of fluidized beds 4, 5. Solid mixing in fluidized beds, which has significant influence on the mass transfer and reactions, is neither fully understood nor predicted because of its complexity 6–8…”

Section: Introductionmentioning

confidence: 99%

Investigation of solid mixing mechanisms in a bubbling fluidized bed using a DEM—CFD approach

Liu¹,

Xiao²,

Chen³

et al. 2011

Asia-Pacific J Chem Eng

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Solid mixing has a great influence on heat transfer and reaction processes in fluidized bed reactors; however, a review shows that the quantitative results are scattered. In this work, the mechanisms of solid mixing in a bubbling fluidized bed are investigated by numerical simulation. A three-dimensional discrete element model (DEM)-computational fluid dynamic (CFD) simulation tool is developed and employed to investigate solid mixing behaviors due to the passage of isolated bubbles, continuous bubbles, and interacting bubbles. The vital role of bubbles on solid mixing has been clearly demonstrated. The results show that: (a) solid mixing in the vertical direction is dominant; (b) when a bubble forms near the air distributor, the continuous jet directly penetrates into the bubble, leading the bubble growing up; (c) lateral solid transport is promoted by bubble interaction, especially when the bubble sizes are different. 

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Investigations on dynamics of bubble in a 2D vibrated fluidized bed using pressure drop signal and high-speed image analysis

Zhang

Zhao

et al. 2020

Chemical Engineering Journal

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Prediction of cluster diameter for a wide range of particles for gas–solid dispersed phase in a fast fluidized‐bed reactor

Cited by 6 publications

References 19 publications

Voidage and Pressure Profile Characteristics of Sand−Iron Ore−Coal−FCC Single-Particle Systems in the Riser of a Pilot Plant Circulating Fluidized Bed

Voidage and Pressure Profile Characteristics of Sand−Iron Ore−Coal−FCC Single-Particle Systems in the Riser of a Pilot Plant Circulating Fluidized Bed

Investigation of solid mixing mechanisms in a bubbling fluidized bed using a DEM—CFD approach

Investigations on dynamics of bubble in a 2D vibrated fluidized bed using pressure drop signal and high-speed image analysis

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