An Investigation on Process of Seeded Granulation in a Continuous Granulator using DEM

Rahmanian, Nejat; Ghani, Nur Fardina Bt Abdul

doi:10.3850/978-981-07-2518-1_380

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“…The work presented here was firstly initiated at the Universiti Teknologi PETRONAS where the corresponding author did the research and also presented the work in 5th Asian Particle Technology Forum [36]. The work was later on extended, adapted and modified in the current form in collaboration with the University of Leeds.…”

Section: Acknowledgementmentioning

confidence: 99%

An investigation on process of seeded granulation in a continuous drum granulator using DEM

Behjani

Rahmanian

Ghani

et al. 2017

Advanced Powder Technology

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Numerical simulation of wet granulation in a continuous granulator is carried out using Discrete Element Method (DEM) to discover the possibility of formation of seeded granules in a continuous process with the aim of reducing number of experimental trials and means of process control. Simple and scooped drum granulators are utilized to attain homogenous seeded granules in which the effects of drum rotational speed, particles surface energy, and particles size ratio are investigated. To reduce the simulation time a scale-up scheme is designed in which a dimensionless number (Cohesion number) is defined based on the work of cohesion and gravitational potential energy of the particles. Also a mathematical/numerical method along with a MATLAB code is developed by which the percentage of surface coverage of each granule is predicted precisely. The results show that use of continuous granulator is promising provided that a high level of shear is considered in the granulator design, i.e. using baffles inside drum granulators is essential for producing seeded granules. It is observed that the optimum surface energy for seeded granulation in scooped granulator (used in this study) with rotational speed of 50 rpm is 3 J/m 2 , which is close to the value predicted by the concept of Cohesion number.It is also shown that increasing the seed/fine size ratio enhances the seeded granulation both quantitatively (60% increase in seeds surface coverage) and qualitatively (more homogeneous granules).

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Section: Acknowledgementmentioning

confidence: 99%