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

Authors

DOI:

https://doi.org/10.15587/1729-4061.2021.239122

Keywords:

granulation, fluidized bed, encapsulation, organic suspension, shell thickness, growth kinetics

Abstract

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.

Author Biographies

Ruslan Ostroha, Sumy State University

PhD

Department of Chemical Engineering

Mykola Yukhymenko, Sumy State University

PhD, Associate Professor

Department of Chemical Engineering

Jozef Bocko, Technical University of Kosice

PhD, Professor

Department of Applied Mechanics and Mechanical Engineering

Artem Artyukhov, Sumy State University

PhD, Associate Professor

Department of Marketing

Jan Krmela, Alexander Dubcek University of Trencin

PhD, Associate Professor

Department of Numerical Methods and Computational Modeling

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Published

2021-08-31

How to Cite

Ostroha, R., Yukhymenko, M., Bocko, J., Artyukhov, A., & Krmela, J. (2021). Determining the main regularities in the process of mineral fertilizer granule encapsulation in the fluidized bed apparatus. Eastern-European Journal of Enterprise Technologies, 4(6(112), 23–32. https://doi.org/10.15587/1729-4061.2021.239122

Issue

Vol. 4 No. 6(112) (2021): Technology organic and inorganic substances

Section

Technology organic and inorganic substances

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Copyright (c) 2021 Ruslan Ostroha, Mykola Yukhymenko, Jozef Bocko, Artem Artyukhov, Jan Krmela

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