Hydrodynamic performance of spouted beds with different types of draft tubes

Nagashima, Hiroshi; Suzukawa, Kazumi; Ishikura, Toshifumi

doi:10.1016/j.partic.2013.01.007

Cited by 33 publications

(13 citation statements)

References 25 publications

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“…Furthermore, the Δ P DT slowly increases as the U s decreases in the spouting state (Figure b). This phenomenon can be explained by a change in the bed condition to an unstable state with intermittent spouting when U s decreases to nearly the terminal velocity of a single particle ( U t ) . Consequently, the holdup of solid particles within the draft tube and the Δ P DT gradually increase during dramatic fluctuations.…”

Section: Resultsmentioning

confidence: 99%

“…This phenomenon can be explained by a change in the bed condition to an unstable state with intermittent spouting when U s decreases to nearly the terminal velocity of a single particle (U t ). [31] Consequently, the holdup of solid particles within the draft tube and the DP DT gradually increase during dramatic fluctuations. If U s decreases further, the spouts become clogged by the solid particles within the draft tube at the minimum spouting velocity.…”

Section: Pressure Drop Versus Spouting Gas Velocitymentioning

confidence: 99%

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A new empirical equation for minimum spouting/spout‐fluidization velocity in draft tube spout‐fluid beds at elevated temperature

Guo

Xie

et al. 2015

Can J Chem Eng

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Draft tube spout‐fluid beds have been widely used in drying, coating, and granulation processes. In these processes, the spout‐fluid reactor is always operated at gas temperatures that exceed ambient conditions. Therefore, one objective of draft tube spout‐fluid bed research is to determine the critical factors that affect the minimum spouting velocity (Ums) and the minimum spout‐fluidization velocity (Umsf) at high temperatures. In this study, four types of particles were used to study the resulting pressure drops. Ums and Umsf were used in a conical draft tube spout‐fluid bed at temperatures of 293–500 K. In addition, a series of operating conditions and geometric configurations were investigated to systematically study the factors that affect Ums and Umsf. Overall, Ums and Umsf increased as the static bed height, entrainment zone height, draft tube diameter, and particle diameter increased. In contrast, Ums decreased as the superficial fluidizing gas velocity and spout nozzle diameter increased. In addition, Umsf increased as the superficial fluidizing gas velocity, spout nozzle diameter, and temperature increased. Furthermore, as the fluidizing gas flow increased, the minimum spouting velocity shifted from increasing to decreasing as the temperature gradually increased. Two general correlations between the Ums and Umsf values and the above factors were proposed. In addition, the influences of operating conditions and geometrical parameters on the minimum spouting velocity should be considered in the design and use of draft tube spout‐fluid beds.

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Section: Resultsmentioning

confidence: 99%

Section: Pressure Drop Versus Spouting Gas Velocitymentioning

confidence: 99%

A new empirical equation for minimum spouting/spout‐fluidization velocity in draft tube spout‐fluid beds at elevated temperature

Guo

Xie

et al. 2015

Can J Chem Eng

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“…It assumes that velocity of the single particle represents the velocity of the moving bed in the cylindrical part of the annular section [5]. ISCR results of different particle sizes in the DTSB set-up are represented in Figure 3-(a).…”

Section: Internal Solid Circulation Rate (Iscr)mentioning

confidence: 99%

“…Different configuration of spouted beds were applied to improve the spouting performance, gas-solid contact, solid circulation rate and gas flow distribution [3,4,5]. Cylindrical-conical [6,7], rectangular-pyramidal [8,9] and conical configurations [4] are the examples of modifications on conventional spouted beds.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of a draft tube spouted bed for effects of geometric parameters on operation

Azizaddini¹,

Lin²,

Dam‐Johansen³

2016

AIP Conference Proceedings

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“…Mathur and Gishler [19] developed a spouted bed which can effectively deal with coarse particles with the same efficiency as a conventional fluidized bed. Since then, spouted beds have been used extensively in wheat drying, coating, granulation, coal gasification, combustion and wastewater treatment [20].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical regeneration of a graphite adsorbent loaded with Acid Violet 17 in a spouted bed reactor

Liu

Roberts²,

Martin

et al. 2016

Chemical Engineering Journal

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h i g h l i g h t sA two-phase reactor is a promising alternative to traditional three-phase reactor. The spouted bed region defined an interesting operating domain. Study of current density and the liquid flow rate on the system performance. A model is developed for the adsorption and electrochemical regeneration process. a b s t r a c tA novel spouted bed reactor is evaluated for water treatment by an adsorption and electrochemical regeneration process. The adsorbent is a bisulphate graphite intercalation compound with low specific surface area but high electrical conductivity, suitable for adsorption of contaminants and simultaneous electrochemical regeneration within a single unit. The effects of current density and liquid flow rate on Acid Violet 17 removal were investigated. The hydrodynamic behaviour of the liquid spouted bed reactor was characterised by a flow regime map. A four-parameter model has been developed to describe the adsorption and electrochemical regeneration process in the liquid spouted bed reactor. It was found that the experimental data of dye removal agrees well with the modelled simulations.

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Hydrodynamic performance of spouted beds with different types of draft tubes

Cited by 33 publications

References 25 publications

A new empirical equation for minimum spouting/spout‐fluidization velocity in draft tube spout‐fluid beds at elevated temperature

A new empirical equation for minimum spouting/spout‐fluidization velocity in draft tube spout‐fluid beds at elevated temperature

Experimental investigation of a draft tube spouted bed for effects of geometric parameters on operation

Electrochemical regeneration of a graphite adsorbent loaded with Acid Violet 17 in a spouted bed reactor

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