Hydrodynamic Characteristics of a Novel Annular Spouted Bed with Multiple Air Nozzles

Gong, Xiwu; Hu, Guoxin; Li, Yanhong

doi:10.1021/ie051381y

Cited by 12 publications

(8 citation statements)

References 32 publications

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“…To overcome this issue, the alignment of several interconnected chambers in parallel holds much promise for scaling up capacity. Several experimental and numerical reports have investigated the scale‐up of other types of spouting apparatus, such as the multiple spouted bed with multiple spouting inlet, the annular spouted bed with multiple air nozzles, the conically spouted bed, flat‐bottom spouted bed, and the slot‐rectangular spouted bed . Although these reports did not focus specifically on the spout‐fluid bed, the results collectively demonstrate that the presence of several inlets leads to significant interactions between chambers.…”

Section: Introductionmentioning

confidence: 99%

CFD–DEM investigation into the scaling up of spout‐fluid beds via two interconnected chambers

et al. 2016

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The hydrodynamics and chamber interaction in a three-dimensional spout-fluid bed with two interconnected chambers are investigated via computational fluid dynamics coupled with discrete element method (CFD-DEM), because multiple interconnected chambers are key to scaling up spout-fluid beds. The overall solid motion, spouting evolution, and spoutannulus interface is studied, followed by time-averaged hydrodynamics, particle-scale information, spout-annulus interaction, and inter-chamber interaction. The results show that inter-chamber interactions lead to unique characteristics distinct from that for a single-chamber system, including (1) asymmetry of the hydrodynamics within each chamber, (2) alternative spouting behavior in the two chambers, (3) smaller pressure drop in terms of magnitude and fluctuations, (4) two peaks in the solid residence time (SRT) frequency histogram of the annulus, (5) average SRT in the spout is twice that in a single-chamber, and (6) larger solid dispersion in all three directions. The results provide meaningful understanding for the scale-up of spout-fluid beds.In view of its excellent performance and widespread application, numerous experimental efforts have unsurprisingly focused on various aspects of this apparatus, spanning the hydrodynamics, 11,12 solid circulation, 13,14 particle velocity profile, 15 pressure drop 16 and fluctuation, 17 flow reigme, 18-20 maximum bed height, 21 particle mixing, 22 minimum spouting velocity, 23 effect of draft plates, 24-26 thermal behavior, 27 and so on. In tandem with experimental investigations, the numerical simulation of the dense two-phase flow has progressed too. As is well-acknowledged, two approaches, namely, the twofluid model (TFM) and computational fluid dynamics combined with discrete element method (CFD-DEM), are available to model the dense gas-solid flow. 28,29 The critical difference between these two approaches lies in the resolution of the solid motion: the solid phase is treated as a continuum and tracked individually in the Lagrangian framework in TFM and CFD-DEM, respectively. Zhong et al. 30 numerically explored the gas/solid flow in the three-dimensional (3-D) spout-fluid bed using TFM, wherein the kinetic theory of granular flow provided the closures. The results demonstrated that the simulation results are strongly affected by the restitution

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Section: Introductionmentioning

confidence: 99%

CFD–DEM investigation into the scaling up of spout‐fluid beds via two interconnected chambers

et al. 2016

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“…To overcome these issues, an alternative approach for scale‐up is to align multiple single‐chamber beds side‐by‐side to enable a larger operational capacity. Experimental and numerical efforts have focused on such a scale‐up approach for the conically spouted bed, annular spouted bed, rectangular spouted bed . However, reports on the scaling of the spout‐fluid bed are limited.…”

Section: Introductionmentioning

confidence: 99%

Improving the operational stability of the multi‐chamber spout‐fluid bed via the insertion of a submerged partition plate

et al. 2016

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The effect of a submerged partition plate on improving the gas–solid flow robustness and stability in a three‐dimensional spout‐fluid bed with multiple inter‐connected chambers is numerically investigated by means of computational fluid dynamics coupled with discrete element method (CFD‐DEM). Notably, multiple‐chamber beds are necessary in scaling up the spout‐fluid bed. The influence of plate height on gas–solid distribution, spout‐annulus interaction and chamber interaction are also studied to optimize the design. The results demonstrate that inserting a partition plate with height above a certain threshold can effectively improve the stability of spouting and uniformly re‐distribute the flux load in each chamber, giving rise to parallel fountains and lower circulation flux of the solid phase. Results indicate that the plate height should be at least 80% of the packed bed height investigated, with the most optimal being about 92% based on steady spouting, and the maximum solid and gas exchanging fluxes between the chambers. © 2016 American Institute of Chemical Engineers AIChE J, 63: 485–500, 2017

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“…The results demonstrated that the lower emission of CO in the multiple-spouted bed can be obtained with under-bed feeding as compared with that of over-bed feeding of the rice husk fuel. Gong et al [10] conducted an experiment in a spouted bed with multiple air nozzles to study the particle hydrodynamics and the effect of air flow on the pressure drop of the multiple-spouted bed. The results illustrated that three distinct spouting stages can be observed with enlarging the gas hold-up.…”

Section: Introductionmentioning

confidence: 99%

Parallel CFD–DEM modeling of the hydrodynamics in a lab-scale double slot-rectangular spouted bed with a partition plate

Yang

Luo

Fang

et al. 2014

Chemical Engineering Journal

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Hydrodynamic Characteristics of a Novel Annular Spouted Bed with Multiple Air Nozzles

Cited by 12 publications

References 32 publications

CFD–DEM investigation into the scaling up of spout‐fluid beds via two interconnected chambers

CFD–DEM investigation into the scaling up of spout‐fluid beds via two interconnected chambers

Improving the operational stability of the multi‐chamber spout‐fluid bed via the insertion of a submerged partition plate

Parallel CFD–DEM modeling of the hydrodynamics in a lab-scale double slot-rectangular spouted bed with a partition plate

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