Minimum fluidization velocities and maximum bed pressure drops for gas–solid tapered fluidized beds

Sau, D C; Mohanty, Swati; Biswal, K. C.

doi:10.1016/j.cej.2007.01.036

Cited by 84 publications

(50 citation statements)

References 16 publications

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“…Table 2.1. Sau et al (2007) concluded that variables such as the tapered angle affect the magnitude of the minimum fluidization velocity. Meanwhile, the bed height for this type of bed does not have a significant effect on the minimum fluidization velocity.…”

Section: Bed Height Effects In the Minimum Fluidization Velocitymentioning

confidence: 99%

“…Sau et al (2007) determined the minimum fluidization velocity for a gas-solid system in a tapered fluidized bed (conical fluidized bed) and studied the effects that bed geometry, specifically the tapered angle, had on the minimum fluidization velocity. They used three different angles (4.61, 7.47, and 9.52 degrees) to observe their effects on minimum fluidization velocity.…”

Section: Minimum Fluidization Velocitymentioning

confidence: 99%

See 1 more Smart Citation

Bed height and material density effects on fluidized bed hydrodynamics

Escudero

Heindel

2011

Chemical Engineering Science

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Section: Bed Height Effects In the Minimum Fluidization Velocitymentioning

confidence: 99%

Section: Minimum Fluidization Velocitymentioning

confidence: 99%

Bed height and material density effects on fluidized bed hydrodynamics

Escudero

Heindel

2011

Chemical Engineering Science

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“…Sau et al [3] determined the minimum fluidization velocity for a gas-solid system in a tapered fluidized bed and studied the effects that bed geometry, specifically the tapered angle, had on the minimum fluidization velocity. They used three different angles (4.61°, 7.47°, and 9.52°) to observe the effect on minimum fluidization velocity.…”

Section: Introductionmentioning

confidence: 99%

“…Sau et al [3] used a gas-solid conical tapered fluidized bed to find the minimum fluidization velocity and the pressure drop across the bed. The dimensions of the fluidized bed at the bottom were 48, 42, and 50 mm, the top of the bed measured 132, 174, and 212 nun, and the column heights were 520, 504 and 483 nun, respectively.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Field Effects on Minimum Fluidization Velocity in a 3D Fluidized Bed

Escudero

Heindel

2012

Volume 2: Fora

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Fluidized beds are used in a variety of process industries because they provide uniform temperature distributions, low pressure drops, and high heat/mass rates. Minimum fluidization velocity is an important factor in understanding the hydrodynamic behavior of fluidized beds, and this characteristic may be modified through high frequency (sound) vibrations. The effects caused by sound wave frequency on the minimum fluidization velocity in a 3D fluidized bed are investigated in this study. Experiments are carried out in a 10.2 cm ID cold flow fluidized bed filled with glass beads with material density of 2600 kg/m 3 , and particles sizes ranging between 212-600 μm. In this study, four different bed height-to-diameter ratios are examined: H/D = 0.5, 1, 1.5, and 2. Moreover, the sound frequency of the loudspeaker used as the acoustic source ranges between 50-200 Hz, with a sound pressure level fixed at 110 dB. Results show that the minimum fluidization velocity is influenced by the frequency change. As the frequency increases, the minimum fluidization velocity decreases until a specific frequency is reached, beyond which the minimum fluidization velocity increases. Thus, acoustic fields provide an improvement in the ease of fluidization of these particles. ABSTRACT Fluidized beds are used in a variety of process industries because they provide uniform temperature distributions, low pressure drops, and high heat/mass rates. Minimum fluidization velocity is an important factor in understanding the hydrodynamic behavior of fluidized beds, and this characteristic may be modified through high frequency (sound) vibrations. The effects caused by sound wave frequency on the minimum fluidization velocity in a 3D fluidized bed are investigated in this study. Experiments are carried out in a 10.2 em ID cold flow fluidized bed filled with glass beads with material density of 2600 kg/m 3 , and particles sizes ranging between 212-600 J.lm. In this study, four different bed height-todiameter ratios are examined: HID = 0.5, 1, 1.5, and 2. Moreover, the sound frequency of the loudspeaker used as the acoustic source ranges between 50-200 Hz, with a sound pressure level fixed at 110 dB. Results show that the minimum fluidization velocity is influenced by the frequency change. As the frequency increases, the minimum fluidization velocity decreases until a specific frequency is reached, beyond which the minimum fluidization velocity increases. Thus, acoustic fields provide an improvement in the ease of fluidization of these particles.

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“…In the recent past, fluidization in tapered bed is gaining importance in view of its potential application in gas-solid system involving continuously decreasing particle size in combustion and gasification of coal, reduction of iron ores [24], etc. Although some investigations have been carried out in conical bed [25,26]and tapered bed [27,28] for prediction of minimum fluidization velocity under ambient conditions, similar data at elevated temperature conditions in tapered bed are not available. In this present work, investigations have been carried out at elevated temperatures to obtain the correlation of minimum fluidization velocity (independent of bed voidage) in tapered bed for gas-solid system and the correlation has been compared with values obtained by equation of Sau et al [28] proposed for tapered bed in ambient conditions in gas-solid systems.…”

Section: Literature Surveymentioning

confidence: 99%

Hydrodynamic Studies on Conventional and Tapered Fluidized Bed

2016

IJSR

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Abstract:In this project the determination of maximum pressure drop, minimum fluidization velocity, minimum bubbling velocity and fluidization index for various powders are to be studied using a conventional cylindrical bed and a tapered bed. Tapered beds have a velocity gradient along the axis unlike conventional beds. They have been used as an alternative to conventional cylindrical beds to deal with problems such as slugging. Initially air at ambient conditions (310 K) is to be used as the fluidizing medium. High temperature studies will also be carried out using a High temperature fluidized bed (Air temperature up to 1173 K).

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Minimum fluidization velocities and maximum bed pressure drops for gas–solid tapered fluidized beds

Cited by 84 publications

References 16 publications

Bed height and material density effects on fluidized bed hydrodynamics

Bed height and material density effects on fluidized bed hydrodynamics

Acoustic Field Effects on Minimum Fluidization Velocity in a 3D Fluidized Bed

Hydrodynamic Studies on Conventional and Tapered Fluidized Bed

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