Influence of contactor geometry and draft tube configuration on the cycle time distribution in sawdust conical spouted beds

Saldarriaga, Juan F.; Atxutegi, Aitor; Altzibar, Haritz; Bilbao, Javier; Olazar, Martı́n

doi:10.1016/j.cherd.2015.05.042

Cited by 26 publications

(21 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…18,19,25,26 A change in ΔP b is also observed with the variation of particle size. 23 Use of porous DT (with peripheral holes) further adds to the insight, accounting for the probable losses of energy through the various porous channels. 20,23,27 Computational fluid dynamics (CFD) simulation findings are seen to effectively describe the solid circulation and particle velocity profiles along with the distribution of gas phase through various regions of DT-SB, highlighting the solid−fluid interactions at various flow conditions.…”

Section: Introductionmentioning

confidence: 99%

“…23 Use of porous DT (with peripheral holes) further adds to the insight, accounting for the probable losses of energy through the various porous channels. 20,23,27 Computational fluid dynamics (CFD) simulation findings are seen to effectively describe the solid circulation and particle velocity profiles along with the distribution of gas phase through various regions of DT-SB, highlighting the solid−fluid interactions at various flow conditions. 22−24,28−34 H e is reported to be the key influencing design parameter on ΔP b for a nonporous DT-assisted SB followed by the height of static bed (H 0 ) and cone angle (γ c ).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Critical Assessment of Performance of a Draft Tube Configured in a Spouted Bed for Various Fluid–Particle Properties

Mollick

Pandit

Vijayan

et al. 2019

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The present study assesses the performance of a draft tube in a spouted bed when its suitability is questioned over a conventional spouted bed for an efficient operation. It has been carefully identified that there always is a critical combination of diameter of the draft tube and the entrainment height below the draft tube, which decides the operational efficiency. The static height of particulate bed is also seen to dictate efficient combination of the draft tube diameter as well as the entrainment height due to the variation in solid pressure. However, such efficient combination is seen to be ineffective if the spouting gas is switched from one to another (here, argon to nitrogen) for a similar particulate bed. Computational fluid dynamics simulation was performed for detailed understanding of the flow behavior of the gas phase, and snapshots of the 2D beds were taken to understand the solid flow pattern.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Critical Assessment of Performance of a Draft Tube Configured in a Spouted Bed for Various Fluid–Particle Properties

Mollick

Pandit

Vijayan

et al. 2019

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…It is well reported in the previous literature that the porous or open-sided DT ease the higher fraction of gas flow into the annular region. − As a matter of fact, the gas pressure drop increases across the DT with the increase in porosity or the open area of the DT. At the same time, U ms is expected to increase when the DT is switched from nonporous to the porous and open-sided one.…”

Section: Introductionmentioning

confidence: 84%

“…Measurement of gas phase residence time (τ g ) has also been reported in the literature for the case of DTSB. τ g is seen to have a higher value for higher H e , and it is reduced obviously with an increase in U . − Average normalized pressure ( P A /Δ P b ) in the annular and the spout has been experimentally found in the case of a DTSB and compared with suitable simulation results. P A /Δ P b is seen to vary nearly linearly with H 0 both in the case of the spout and the annular region .…”

Section: Introductionmentioning

confidence: 99%

Novel Porous Draft Tube To Manipulate Fluid Throughput from Spout to Annulus in a Spouted Bed

Mollick

Pandit

Mukherjee

et al. 2020

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

A porous draft tube (DT) with suitable converging and diverging angles having varying porosity is newly introduced in a spouted bed (SB) for manipulating the fluid exchange rate from the spout to the annular region and thus to enhance the fluid residence time in the annular region. A comparative study of the exchange of the spouting gas (argon) into the bed of zirconia and glass beads in a conventional, nonporous, and porous DT-fitted SB with different converging and diverging angles of 9 and 18° is reported here. Computational fluid dynamics simulation using “Fluent, v-15.0” was performed to identify hydrodynamic phenomena inside the DT as well as in the bed for converging and diverging porous DT designs. Experimental findings for the efficient combination of converging and diverging angles have been compared with the simulation results.

show abstract

“…The mass flow rate in the spout, together with the average particle cycle time, have been adopted as standard parameters for assessing the circulation of solids in spouted beds 13, 14. The particle circulation in the spouted beds is directly related to heat and mass transfer rates 15, 16, so it is a key factor to consider in their modeling and design 17. Moreover, to make effective use of conical spouted beds in industrial facilities, an improved fundamental understanding of their hydrodynamics is required 18.…”

Section: Introductionmentioning

confidence: 99%

Multiple‐Output Artificial Neural Network to Estimate Solid Cycle Times in Conical Spouted Beds

et al. 2021

Self Cite

View full text Add to dashboard Cite

Knowledge of cycle times is essential to design spouted beds. Although experiments for determining cycle times are time‐consuming, there is hardly any mechanistic or empirical model for their prediction. Two types of artificial neural networks, namely, single‐ and multiple‐output ones, have been developed to estimate particle cycle times in conical spouted beds. They provide satisfactory cycle time predictions under different configurations. A comparison of single‐output neural networks with multiple‐output ones proves that, although the former fit slightly better the experimental data, the latter provide a reasonable prediction of all cycle times, and therefore, only one neural network is sufficient for their prediction. The maximum cycle is the one of highest sensitivity to all the parameters analyzed.

show abstract

Influence of contactor geometry and draft tube configuration on the cycle time distribution in sawdust conical spouted beds

Cited by 26 publications

References 56 publications

Critical Assessment of Performance of a Draft Tube Configured in a Spouted Bed for Various Fluid–Particle Properties

Critical Assessment of Performance of a Draft Tube Configured in a Spouted Bed for Various Fluid–Particle Properties

Novel Porous Draft Tube To Manipulate Fluid Throughput from Spout to Annulus in a Spouted Bed

Multiple‐Output Artificial Neural Network to Estimate Solid Cycle Times in Conical Spouted Beds

Contact Info

Product

Resources

About