Study on the flow behavior in spout-fluid bed with a draft tube of sub-millimeter grade silicon particles

Su, Guoliang; Huang, Guoqiang; Li, Ming; Liu, Chunjiang

doi:10.1016/j.cej.2013.10.029

Cited by 19 publications

(6 citation statements)

References 35 publications

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“…Meanwhile, the nucleating efficiency decreased with the modification. The result suggests that N-WPCB acted as nucleation agents in the PP matrix during nonisothermal crystallization of PP/N-WPCB composites [ 18 ]. The heterogeneous nucleation effect of N-WPCB can improve the crystallization capability of PP, thus improving the mechanical properties of composite.…”

Section: Resultsmentioning

confidence: 99%

“…Then, the crystallization and melting curves were obtained by cooling the samples from 200 to 30 °C at a rate of 10 °C·min −1 and heating the samples back to 200 °C at 10 °C·min −1 , respectively. The crystalline ratio

was calculated by the following Equation (1) [ 18 ]:

where

is the melting enthalpy of samples,

is the theoretical value of the melting enthalpy for a 100% crystalline PP, which is 209 J·g −1 , and φ is the weight fraction of WPCB in the sample.…”

Section: Methodsmentioning

confidence: 99%

“…Then, the crystallization and melting curves were obtained by cooling the samples from 200 to 30 • C at a rate of 10 • C•min −1 and heating the samples back to 200 • C at 10 • C•min −1 , respectively. The crystalline ratio X c was calculated by the following Equation (1) [18]:…”

Section: Measurement Of Propertiesmentioning

confidence: 99%

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Polypropylene Composites Reinforced by Nonmetallic from Waste Printed Circuit Boards Using Spout-Fluid Bed Coating with PP Particles Enhance Fluidization

Jiang

Meng

et al. 2021

Polymers

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Nonmetallic materials recycled from waste printed circuit boards (N-WPCBs) were modified by coating KH-550 in a spout-fluid bed. To improve the effect of the modification, PP particles were used to enhance the fluidization quality of the N-WPCB particles in the coating modification. Then, the modified N-WPCBs were used as fillers to fabricate PP/N-WPCB composites. The method of coating in a spout-fluid bed with PP particles enhanced fluidization and showed the best modification effect compared to other coating methods. The FT-IR and SEM results demonstrated that interfacial bonding between N-WPCBs and PP could be enhanced by modified N-WPCBs, which improved the mechanical properties of the composites. When the mass ratio of PP to N-WPCBs is 100:75 and the dose of KH-550 is 4 phr, the flexural strength, tensile strength, and impact strength of the composites increase by 16.60%, 23.22%, and 23.64%, respectively. This would realize the high-value utilization of N-WPCBs with coating modification in the spout-fluid bed.

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Section: Resultsmentioning

confidence: 99%

was calculated by the following Equation (1) [ 18 ]:

where

is the melting enthalpy of samples,

is the theoretical value of the melting enthalpy for a 100% crystalline PP, which is 209 J·g −1 , and φ is the weight fraction of WPCB in the sample.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Polypropylene Composites Reinforced by Nonmetallic from Waste Printed Circuit Boards Using Spout-Fluid Bed Coating with PP Particles Enhance Fluidization

Jiang

Meng

et al. 2021

Polymers

View full text Add to dashboard Cite

show abstract

“…In view of its excellent performance and widespread application, numerous experimental efforts have unsurprisingly focused on various aspects of this apparatus, spanning the hydrodynamics, solid circulation, particle velocity profile, pressure drop and fluctuation, flow reigme, maximum bed height, particle mixing, minimum spouting velocity, effect of draft plates, thermal behavior, and so on. In tandem with experimental investigations, the numerical simulation of the dense two‐phase flow has progressed too.…”

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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“…Experimental characterization of the hydrodynamics have included the solid circulation rate, voidage and particle velocity, pressure fluctuation, flow pattern and regime, spoutable height, gas mixing, particle mixing, draft plate or tube insertions, thermal behavior, spout evolution . Concurrently, numerical simulations, via either the two‐fluid model (TFM) or computational fluid dynamics coupled with discrete element method (CFD‐DEM), have also provided more understanding on the hydrodynamics of the spout‐fluid bed.…”

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

show abstract

Study on the flow behavior in spout-fluid bed with a draft tube of sub-millimeter grade silicon particles

Cited by 19 publications

References 35 publications

Polypropylene Composites Reinforced by Nonmetallic from Waste Printed Circuit Boards Using Spout-Fluid Bed Coating with PP Particles Enhance Fluidization

Polypropylene Composites Reinforced by Nonmetallic from Waste Printed Circuit Boards Using Spout-Fluid Bed Coating with PP Particles Enhance Fluidization

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

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