Investigation on dynamic movement of cylindrical biomass particles in a fast fluidized bed

Geng, Fan; Feng, Xinyue; Teng, Haixu; Yuan, Lang; Cai, Jie; Li, Tie; An, Jajun; Yuan, Shilong; Wu, Shuo

doi:10.1016/j.apt.2021.103397

Cited by 7 publications

(4 citation statements)

References 49 publications

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“…Since the speed of the particles in the sidewall region is significantly smaller than that near the center, the particles settle along the sidewalls and reflux occurs. This is similar and consistent with the findings of Geng 54 and Chen. 55 The tendency of particle aggregation to form agglomerates is different for different spatial locations of the lifting tube.…”

Section: Resultssupporting

confidence: 93%

Experimental Study on the Agglomeration Behavior of Elongated Biomass Particles in a Lifting Tube

Du,

Yang,

Tao

et al. 2024

ACS Omega

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Pneumatic conveying devices are commonly used in the fields of chemical industry, raw material transportation, and material processing. Elongated biomass particles are not evenly distributed in the lifting tube because biomass clumps during conveying. Pneumatic conveying test setup and measurement system were built in this paper in order to study the agglomeration behavior of elongated biomass particles in the lifting tube experimentally. Particle tracking velocimetry (PTV) was used to determine the area distribution and velocity distribution of particles at different apparent air velocities and mass flow rates. The results show that while keeping the mass flow rate constant at 46.50 g/s, the apparent gas velocity increased from 5.91 to 7.91 m/s and the maximum size of agglomerates decreased from 0.689 to 0.235. The apparent gas velocity was kept at 6.40 m/s, and the particle mass flow rate was adjusted from 56.50 to 16.20 g/s. The maximum size of the agglomerates was reduced to 0.115. Therefore, appropriately increasing the apparent gas velocity or decreasing the particle mass flow rate can improve the uniformity of the particle distribution in the lifting tube. The results would provide a reference for parameter adjustment of pneumatic conveying devices in industrial production.

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Section: Resultssupporting

confidence: 93%

Experimental Study on the Agglomeration Behavior of Elongated Biomass Particles in a Lifting Tube

Du,

Yang,

Tao

et al. 2024

ACS Omega

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“…Orientation is the major difference between spherical particles and nonspherical particles, and it can not only influence the hydrodynamics of gas-solid flow but also determine the whole characteristics of the system. 4 For elongated particles, the effects of orientations are more pronounced. Therefore, the verification of CG CFD-DEM for nonspherical particles should be premised on replicating particle orientations.…”

Section: Particle Orientationmentioning

confidence: 99%

“…Moreover, after pulverization and palletization, biomass particles in fluidized beds feature elongated shapes in nature. [4][5][6][7] Elongated particles have more complex inter-particle and fluid-particle interplays, and existing principles suitable for spherical particles cannot be straightforwardly assumed to be effective for elongated particles.…”

Section: Introductionmentioning

confidence: 99%

“…One of the challenges comes from the fact that complicated gas–solid two‐phase interactions involving mass, momentum, and energy transfer have not been well understood yet, which hinders the proper designing and upscaling of efficient reactors. Moreover, after pulverization and palletization, biomass particles in fluidized beds feature elongated shapes in nature 4–7 . Elongated particles have more complex inter‐particle and fluid‐particle interplays, and existing principles suitable for spherical particles cannot be straightforwardly assumed to be effective for elongated particles.…”

Section: Introductionmentioning

confidence: 99%

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Development and verification of coarse‐grain CFD‐DEM for nonspherical particles in a gas–solid fluidized bed

Zhou

Liu

et al. 2022

AIChE Journal

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Computational fluid dynamics coupled with discrete element method (CFD‐DEM) has been widely used to understand the complicated fundamentals inside gas–solid fluidized beds. To realize large‐scale simulations, CFD‐DEM integrated with coarse‐grain model (CG CFD‐DEM) provides a feasible solution, and has led to a recent upsurge of interest. However, when dealing with large‐scale simulations involving irregular‐shaped particles such as biomass particles featuring elongated shapes, current CG models cannot function as normal because they are all developed for spherical particles. To address this issue, a CG CFD‐DEM for nonspherical particles is proposed in this study, and the morphology of particles is characterized by the super‐ellipsoid model. The effectiveness and accuracy of CG CFD‐DEM for nonspherical particles are comprehensively evaluated by comparing the hydrodynamic behaviors with the results predicted by traditional CFD‐DEM in a gas–solid fluidized bed. It is demonstrated that the proposed model can accurately model gas–solid flow containing nonspherical particles, merely the particle dynamics are somewhat lost due to the scaleup of particle size. Finally, the calculation efficiency of CG CFD‐DEM is assessed, and the results show that CG CFD‐DEM can largely reduce computational costs mainly by improving the calculation efficiency of DEM. In general, the proposed CG CFD‐DEM for nonspherical particles strikes a good balance between efficiency and accuracy, and has shown its prospect as a high‐efficiency alternative to traditional CFD‐DEM for engineering applications involving nonspherical particles.

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Evolution of mesoscale structure in fluidized beds with non-spherical dry and wet particles

Ren¹,

Tang²,

He³

2022

Advanced Powder Technology

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Investigation on dynamic movement of cylindrical biomass particles in a fast fluidized bed

Cited by 7 publications

References 49 publications

Experimental Study on the Agglomeration Behavior of Elongated Biomass Particles in a Lifting Tube

Experimental Study on the Agglomeration Behavior of Elongated Biomass Particles in a Lifting Tube

Development and verification of coarse‐grain CFD‐DEM for nonspherical particles in a gas–solid fluidized bed

Evolution of mesoscale structure in fluidized beds with non-spherical dry and wet particles

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