Stability and performance of a spouted bed in drying skimmed milk: Influence of the cone angle and air inlet device

Perazzini, Maisa Tonon Bitti; Freire, Fábio Bentes; Ferreira, María do Carmo; Freire, José Teixeira

doi:10.1080/07373937.2017.1331240

Cited by 23 publications

(9 citation statements)

References 33 publications

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“…Spout deflection is a typical instability phenomenon in spouted and spout-fluidized beds. It can cut-off the normal particle movement circulation, which is the resort of high interaction efficiency of the gas–solid phases in spouted and spout-fluidized beds. − Thus, to eliminate the spout deflection and achieve stable spouting quality, various modifications to the reactor geometry have been tried, such as adjusting the gas inlet device shape, − adjusting the slot angle, ,, and installing draft plates. − However, these modifications have side effects on the hydrodynamics of gas–solid systems, such as lowering the solid circulation velocity or enhancing the spout incoherence . Moreover, the fundamentals related to spout deflection have not been well understood, especially under various operational conditions.…”

Section: Introductionmentioning

confidence: 99%

Particle-Scale Study of the Effect of Operating Conditions on Spout Deflection Behavior in a Flat-Bottomed Spout-Fluidized Bed

Yue

Shen

2019

Ind. Eng. Chem. Res.

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Spout deflection is a common instability phenomenon in spout-fluidized beds. The hydrodynamics of spout deflection under several key operating variables, including static bed height (H 0), background velocity (U bg), and reactor column width (W), is investigated by means of the computational fluid dynamic-discrete element method (CFD-DEM) coupling approach. The results show that non-alternating spout deflection can be easily observed when the H 0 is larger than 236 mm or the W is less than 0.14 m in this study. For alternating spout deflection, first, there is an upper limit for its amplitude because of the self-locking phenomenon in the bottom corner. Large W promotes the regularity, while the effects of H 0 on regularity is neglectable. Thirdly, the main frequency of the alternating spout deflection reduces with increasing H 0 and increasing U bg and finally stabilizes at 1.7 Hz. This study sheds light on the design, optimization, and operation of spout-fluidized beds.

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Section: Introductionmentioning

confidence: 99%

Particle-Scale Study of the Effect of Operating Conditions on Spout Deflection Behavior in a Flat-Bottomed Spout-Fluidized Bed

Yue

Shen

2019

Ind. Eng. Chem. Res.

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“…Such hysteresis is typical of the conventional spouted bed, being attributed to the loosening effect by decreasing the air flow. 36,40 Overall, the mechanical stirring spouted bed presents a behavior similar to the conventional spouted bed. This result is probably due to the geometry and position of the mechanical stirrer, which was placed in the center of the bed.…”

Section: Resultsmentioning

confidence: 90%

“…When the spouting regime ceases, there is a sharp increase in pressure drop, which presents a much smaller peak than the maximum pressure drop reached by increasing the air flow. Such hysteresis is typical of the conventional spouted bed, being attributed to the loosening effect by decreasing the air flow. , …”

Section: Results and Discussionmentioning

confidence: 96%

Fluid Dynamic Analysis of a Modified Mechanical Stirring Spouted Bed: Effect of Particle Properties and Stirring Rotation

AzevedoBarros

Brito

Freire

et al. 2020

Ind. Eng. Chem. Res.

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The purpose of this study is to perform the fluid dynamic analysis of a modified mechanical stirring spouted bed, which has been proposed as a promising alternative to the conventional spouted bed. Thus, a comparison is also performed between the dynamic behaviors of such equipment. The addition of the stirrer to the spouted bed enhanced the movement of particles in the bed. The mechanical stirring spouted bed presented better performance than the conventional configuration at stirrer rotations above 90 rpm. Small particles were less susceptible to the effect of stirrer rotation than large particles, demanding a higher rotation to provide a lower minimum air flow rate. The proposed model provided good predictions in terms of maximum pressure drop and minimum air velocity in the modified mechanical stirring spouted bed. The findings of this study contribute to the development of versatile and promising equipment for different processes and operations, providing the key parameters for an appropriate design.

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“…In these applications, the conical spouted beds are advantageous alternatives due to their short gas residence times with narrow distribution [15]. Operation of conical spouted beds is sensitive to various parameters such as bed geometry, operating conditions as well as gas and solid properties [16][17][18][19][20][21][22][23][24][25]. For a combination of these parameters, stable spouting occurs only over a limited range of operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Detecting stability of conical spouted beds based on information entropy theory

et al. 2019

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Where a licence is displayed above, please note the terms and conditions of the licence govern your use of this document. When citing, please reference the published version. Take down policy While the University of Birmingham exercises care and attention in making items available there are rare occasions when an item has been uploaded in error or has been deemed to be commercially or otherwise sensitive.

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Stability and performance of a spouted bed in drying skimmed milk: Influence of the cone angle and air inlet device

Cited by 23 publications

References 33 publications

Particle-Scale Study of the Effect of Operating Conditions on Spout Deflection Behavior in a Flat-Bottomed Spout-Fluidized Bed

Particle-Scale Study of the Effect of Operating Conditions on Spout Deflection Behavior in a Flat-Bottomed Spout-Fluidized Bed

Fluid Dynamic Analysis of a Modified Mechanical Stirring Spouted Bed: Effect of Particle Properties and Stirring Rotation

Detecting stability of conical spouted beds based on information entropy theory

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