CFD-DEM modelling of circulation frequencies and residence times in a prismatic spouted bed

Pietsch, Swantje; Kieckhefen, Paul; Heinrich, Stefan; Müller, Michael; Schönherr, Michael; Jäger, Frank

doi:10.1016/j.cherd.2018.01.013

Cited by 27 publications

(12 citation statements)

References 28 publications

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“…Future studies will be concerned with the application of different granulator geometries, like spouted beds that are used for coating (Pietsch et al, 2018), and scale-up to pilot-scale granulators with different mixing times (Diez et al, 2019), as well as utilization of the CFD-DEM method (Kieckhefen et al, 2020) to correlate mixing times and particle-scale drying conditions with the resulting surface structures.…”

Section: Discussionmentioning

confidence: 99%

Correlating Granule Surface Structure Morphology and Process Conditions in Fluidized Bed Layering Spray Granulation

Orth

Kieckhefen

Pietsch

et al. 2022

KONA

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A workflow for developing a multidimensional, linear correlation between the process conditions during fluidized bed spray granulation and the surface morphology of the resulting granules is presented. Spray coating experiments with Cellets ® 500 particles and sodium benzoate solution were performed in a lab-scale fluidized bed varying liquid spray rate, fluidization air flow rate, fluidization air temperature, spray air temperature and spray atomization pressure. To characterize the surface structure, the surface roughness of the coated particles was quantified using confocal laser-scanning microscopy. The roughness was correlated to the process conditions, and the resulting correlation was rigorously analyzed for the importance and co-linearities of the individual process parameters using a principal component analysis. The surface roughness is strongly dependent on the spray rate of the coating solution, the fluidization air temperature and the atomization pressure at the nozzle. In general, wet process conditions and large droplets with a low initial velocity favor the formation of particles with a rough surface structure, while dry conditions and fine droplets with a high velocity result in granules with a smooth and compact coating layer.

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Section: Discussionmentioning

confidence: 99%

Correlating Granule Surface Structure Morphology and Process Conditions in Fluidized Bed Layering Spray Granulation

Orth

Kieckhefen

Pietsch

et al. 2022

KONA

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“…Initially, Aparicio‐Mauricio et al 19 developed a method to describe concentration and temperature profiles in an industrial PBR under the influence of different hydrodynamic conditions. On the other hand, as the technology of processors developed, it was found that computational fluid dynamics (CFD) simulations can be exploited as an economic and quick approach to achieve a better understanding of PBCs 20–25. As one of the earliest CFD studies, Sørensen and Stewart simulated creeping flow in a PBR containing four simple spherical packings 26.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer at a Particle‐Tube Wall Contact Point: Impact of Catalyst Configuration on Hot Spots

2021

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Hot spots tend to cause serious problems owing to probable damages to the reactor wall in intense endothermic reactions leading to safety concerns and enormous repairing costs. The heat transfer of a single cylindrical particle is studied empirically and numerically to evaluate hot spot creation close to the bed wall. Computational fluid dynamcis (CFD) methodology is used to solve the momentum, continuity, and energy equations simultaneously. The newly developed experimental method is applied to validate simulation data using the Chilton‐Colburn analogy. The particle rotation over the X, Y, and Z axes is studied and analysis of variance (ANOVA) is employed to statistically investigate the particle rotation effects on the dimensionless maximum temperature of the reactor wall.

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“…Spouted beds have several advantages and potential applications compared to moving beds. They can handle granular particles with a wide size distribution range, provide an efficient mixing between the solid and gas phases and significant rates of heat and mass transfer [1][2][3][4][5][6][7][8]. Inert particles spouted bed reactor (IPSBR) is a spouted bed in which a gas jet is injected at the bottom of a conical vessel containing liquid and inert particles [9].…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Optimization of the Dispersion of Mixing Particles in an Inert-Particle Spouted-Bed Reactor (IPSBR) System

et al. 2021

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Effective gas dispersion and liquid mixing are significant parameters in the design of an inert-particle spouted-bed reactor (IPSBR) system. Solid particles can be used to ensure good mixing and an efficient rate of mass and heat transfer between the gas and liquid. In this study, computational fluid dynamics (CFD) coupled with the discrete phase model (DPM) were developed to investigate the effect of the feed gas velocity (0.5–1.5 m/s), orifice diameter (0.001–0.005 m), gas head (0.15–0.35 m), particle diameter (0.009–0.0225 m), and mixing-particle-to-reactor-volume fraction (2.0–10.0 vol.%) on the solid mass concentration, average solid velocity, and average solid volume fraction in the upper, middle, and conical regions of the reactor. Statistical analysis was performed using a second-order response surface methodology (RSM) with central composite design (CCD) to obtain the optimal operating conditions. Selected parameters were optimized to maximize the responses in the middle and upper regions, and minimize them in the conical region. Such conditions produced a high interfacial area and fewer dead zones owing to good particle dispersion. The optimal process variables were feed gas velocity of 1.5 m/s, orifice diameter of 0.001 m, gas head of 0.2025 m, a particle diameter of 0.01 m, and a particle load of 0.02 kg. The minimum average air velocity and maximum air volume fraction were observed under the same operating conditions. This confirmed the novelty of the reactor, which could work at a high feed gas velocity while maintaining a high residence time and gas volume fraction.

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CFD-DEM modelling of circulation frequencies and residence times in a prismatic spouted bed

Cited by 27 publications

References 28 publications

Correlating Granule Surface Structure Morphology and Process Conditions in Fluidized Bed Layering Spray Granulation

Correlating Granule Surface Structure Morphology and Process Conditions in Fluidized Bed Layering Spray Granulation

Heat Transfer at a Particle‐Tube Wall Contact Point: Impact of Catalyst Configuration on Hot Spots

Comprehensive Optimization of the Dispersion of Mixing Particles in an Inert-Particle Spouted-Bed Reactor (IPSBR) System

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