Particle dynamics in a multi-staged fluidized bed: Particle transport behavior on micro-scale by discrete particle modelling

Diez, E.; Kieckhefen, Paul; Meyer, Katja; Bück, Andreas; Tsotsas, Evangelos; Heinrich, Stefan

doi:10.1016/j.apt.2019.05.025

Cited by 20 publications

(1 citation statement)

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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%