Control of Particle Size and Porosity in Continuous Fluidized‐Bed Layering Granulation Processes

Neugebauer, C. J.; Bück, Andreas; Kienle, Achim

doi:10.1002/ceat.201900435

Cited by 8 publications

(5 citation statements)

References 13 publications

(29 reference statements)

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“…While layering growth is most commonly described in terms of the particle diameter [15][16][17], the agglomeration term is predominantly given with respect to the volume coordinate [14,18]. In the present contribution we choose to transform the layering growth term and model the complete PBE in volume coordinates, i.e., x = v and n = n(t, v).…”

Section: Process Modelmentioning

confidence: 99%

Stability of Combined Continuous Granulation and Agglomeration Processes in a Fluidized Bed with Sieve-Mill-Recycle

2023

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Particle formation in fluidized beds is widely applied in an industrial context for the solidification of liquids and size enlargement of granular materials. The two main size-enlargement mechanisms are layering growth and agglomeration. For continuous process configurations with sieve-mill-recycle and layering growth only, the occurrence of undesired self-sustained oscillations in the particle size distribution under certain process conditions is well-known. This contribution investigates the stability of the practically relevant process with additional particle agglomeration by means of a model-based numerical bifurcation analysis. It is shown that the occurrence of stable limit cycles is inhibited by an increased rate of particle agglomeration for a variety of different process conditions and different agglomeration kinetics. These results enhance the understanding of the agglomeration and layering growth dynamics and are relevant for the process design and operation.

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Section: Process Modelmentioning

confidence: 99%

Stability of Combined Continuous Granulation and Agglomeration Processes in a Fluidized Bed with Sieve-Mill-Recycle

2023

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“…In [21], a new conceptual model for the simultaneous control of a particle size and porosity in the fluidized bed granulation process was proposed, which ensured stable operation of the process, automatic adjustment of the desired properties of the finished product, and prevention of unforeseen violations of the technological mode. However, regulation of the particle size was carried out by auxiliary processes -grinding and sieving of the finished granules.…”

Section: Problem Statementmentioning

confidence: 99%

Hydraulic Regularities of Fluidized Bed During Encapsulation of Organo-mineral Fertilizers

Ostroha¹,

Yukhymenko²,

Mandryka³

2023

AMS

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The advantages of using encapsulated organo-mineral fertilizers are presented. It is proposed to use a fluidized bed apparatus for coating carbamide granules with an organic shell. Importance of the fluidized bed hydraulic characteristics and their influence on the energy costs of the process are emphasized. Experimental study results prove that irrigation density of granular layer with the suspension has significant influence on the hydraulic resistance of a fluidized bed. It is proposed an analytical dependence for determining the hydraulic resistance of a fluidized bed, which takes into account influence of the organic suspension flow rate.

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“…In work [12], a new conceptual model of simultaneous control over the size and porosity of particles in the process of granulation in the fluidized bed was proposed, which ensured stable process operation, automatic adjustment of the desired properties of the finished product, and prevention of unforeseen violations of the technological regime. However, the particle size was adjusted by auxiliary processesgrinding and sifting of the finished granules and not by the influence of the regime and technological parameters of the main granulation process.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Determining the main regularities in the process of mineral fertilizer granule encapsulation in the fluidized bed apparatus

Ostroha

Yukhymenko

Bocko

et al. 2021

EEJET

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This paper has substantiated the expediency and prospects of obtaining organomineral fertilizers by encapsulating mineral granules with an organic suspension in fluidized bed apparatuses. An overview of existing approaches to the mathematical description of the kinetics of granule growth in granulation processes in fluidized bed apparatuses is presented. A mathematical model of the kinetics of the formation of a hard shell around granules in a fluidized bed has been built. It shows that the kinetics depend on the size of the retour particles, the specific flow rate of the suspension, the density of the suspension and granules, and the time of the process. Equations have been derived for determining the thickness of the hard shell and the specific flow rate of the suspension for individual granulation stages in a multi-stage granulator of the fluidized layer. Analytically, graphical dependences were built, which showed an increase in the thickness of the hard shell due to an increase in the specific flow rate of the suspension, the diameter of the retour particles, and the time of the encapsulation process. The equations make it possible to determine the rational regime and technological parameters of the encapsulation process in order to obtain a coating of the predefined thickness at the surface of the granules. This ensures that a quality product is obtained, with a granulometric composition in a narrower range of particle size. To obtain granules of 2.5–4 mm in size, it is necessary to carry out the process in three- or four-stage granulators of the fluidized bed at specific suspension consumption of (10–20)∙10-4 kg/(kg∙s.). It is shown that with uniform growing of granules with a constant increase in the thickness of the shell in multistage granulators, the suspension consumption decreases by 2‒3 times from the first stage to the subsequent ones. This approach reduces the operating and energy costs of the process.

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Control of Particle Size and Porosity in Continuous Fluidized‐Bed Layering Granulation Processes

Cited by 8 publications

References 13 publications

Stability of Combined Continuous Granulation and Agglomeration Processes in a Fluidized Bed with Sieve-Mill-Recycle

Stability of Combined Continuous Granulation and Agglomeration Processes in a Fluidized Bed with Sieve-Mill-Recycle

Hydraulic Regularities of Fluidized Bed During Encapsulation of Organo-mineral Fertilizers

Determining the main regularities in the process of mineral fertilizer granule encapsulation in the fluidized bed apparatus

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