Conference article

Population balance modelling for fertilizer granulation process

Ludmila Vesjolaja
Department of Electrical Engineering, IT and Cybernetics, University of South-Eastern Norway, Norway

Bjørn Glemmestad
Process Modeling and Control Department, Yara Technology Center, Norway

Bernt Lie
Department of Electrical Engineering, IT and Cybernetics, University of South-Eastern Norway, Norway

Download articlehttp://dx.doi.org/10.3384/ecp1815395

Published in: Proceedings of The 59th Conference on Simulation and Modelling (SIMS 59), 26-28 September 2018, Oslo Metropolitan University, Norway

Linköping Electronic Conference Proceedings 153:14, p. 95-102

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Published: 2018-11-19

ISBN: 978-91-7685-494-5

ISSN: 1650-3686 (print), 1650-3740 (online)

Abstract

Few granulation plants are operated optimally. It is common to operate granulation plants below their maximum design capacity, and in many cases, periodic instabilities may also occur. From a process control and optimization point of view, it is desirable to develop a dynamic model that can show the dominating dynamics of a granulation process and can be used for design of optimal operation of the granulation plant. In this paper, a dynamic model of a drum granulator is developed using population balance (PB). Different simulation scenarios are used to analyze various granulation mechanisms that are characteristic to drum granulators. Simulation results show that for the drum granulator, the particle agglomeration has a greater impact on the change in particle size distribution (PSD) compared to the particle growth due to layering. In addition, coarser particles are produced when a sizedependent agglomeration kernel is used in the granulator model. For combined processes, i.e., processes where the particle growth due to layering and agglomeration are considered simultaneously, coarser particles with a wider PSD are obtained with the size-dependent agglomeration kernel.

Keywords

granulation, population balance, agglomeration, layering

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