Discrete Element Method Model Optimization of Cylindrical Pellet Size

Rozbroj, Jiří; Zegzulka, Jiří; Nečas, Jan; Jezerská, Lucie

doi:10.3390/pr7020101

Cited by 8 publications

(7 citation statements)

References 27 publications

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“…Discrete element method (DEM) is proven as a powerful tool with the capabilities of monitoring the behavior of individual particles inside a system resulting in understanding the bulk material behavior. Recently, researchers applied DEM to study the flow properties of cylindrical pellets [11], mixing and transportation of wood pellets [12], and durability characteristics of biomass pellets [13]; however, fragmentation of biomass pellets have been scarcely investigated by modeling and simulations. A recent study addresses the modeling of deformation and breakage behavior of biofuels wood pellets [14] using the finite element method (FEM).…”

Section: Introductionmentioning

confidence: 99%

Breakage behavior of biomass pellets: an experimental and numerical study

2020

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The presence and generation of fines and dust in the bulk of biomass pellets have inflicted several problems in the supply chain during transportation and storage, and the breakage behavior of pellets has been scarcely studied so far. Fines and dust are the consequences of impact and abrasive forces through the whole supply chain; however, the breakage happens at the particle level. Therefore, to study the fines generation, first, the breakage behavior of individual pellets should be understood, and then, the behavior of the bulk materials in operational conditions can be investigated. This paper aims to investigate the breakage behavior of individual pellets under experimental compression tests and to introduce a calibrated numerical model using discrete element method (DEM) in order to pave the way for further studies on pellet breakage. For that purpose, seven different types of biomass pellets were studied experimentally, and then, a calibrated model was introduced via the Timoshenko-Ehrenfest beam theory using DEM. Results show that the model could reasonably predict the breakage behavior of pellets under uniaxial and diametrical compressions. The findings could help to develop a new design of the equipment for transportation and handling of biomass pellets with the aim to reduce the amount of generating fines and dust.

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Section: Introductionmentioning

confidence: 99%

Breakage behavior of biomass pellets: an experimental and numerical study

2020

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“…Following this scheme, Hlosta et al (2020a) combined the experimental results obtained from several apparatus with numerical simulations in order to validate the values of different interaction coefficients (i.e., the static friction coefficient, the rolling friction coefficient or the coefficient of restitution) required to develop a DEM model. Rozbroj et al (2019) used DEM simulations to conduct a sensitivity analysis of the length accuracy grade of cylindrical pellets with the optimal calibration of time and velocity during the discharge of a cylindrical vessel.…”

Section: Introductionmentioning

confidence: 99%

Determination of mechanical properties for wood pellets used in DEM simulations

Gallego¹,

Fuentes²,

Ruíz³

et al. 2020

Int. Agrophys.

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“…All virtual particulate materials were calibrated by the use of the static angle of repose (S-AoR) and the dynamic angle of repose (D-AoR) and the discharge from the calibration model hopper. The issues of discharge calibration of the particles in the DEM are described in the study of Rozbroj et al (2019) [33]. These input data were additionally specified more exactly.…”

Section: Numerical Modellingmentioning

confidence: 99%

DEM Investigation of the Influence of Particulate Properties and Operating Conditions on the Mixing Process in Rotary Drums: Part 2—Process Validation and Experimental Study

et al. 2020

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The process of homogenization of particulates is an indispensable part of many industrial processes, and, therefore, it is necessary to pay a special attention to this area and develop it. This paper deals with a complex study of homogenization of particulate matters in a rotary drum in terms of shape, size, and density of particles. In addition, the influence of operating parameters, such as drum filling capacity, rotational speed, and drum filling pattern are also investigated. Studies of reproducibility of discrete element method simulations, effects of rotary drum sizes or effects of drum volumetric filling to the mixture homogeneity index were also carried out. In general, the least satisfactory values of the homogeneity index resulted from the mixing of particles with different densities. The dominating factor of homogenization was the drum filling-up degree. The course of the homogeneity index in 140, 280, and 420 mm drums was very similar and after five revolutions of the drum, identical values of the homogeneity index were achieved for all the drum diameters. The optimal drum filling-up degree is at 40–50% for the spherical particles and 30–40% for the sharp-edged particles. The repeatability of simulations showed the maximum relative standard deviation of the homogeneity index at 0.6% from ten simulation repetitions with the same parametric conditions.

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Discrete Element Method Model Optimization of Cylindrical Pellet Size

Cited by 8 publications

References 27 publications

Breakage behavior of biomass pellets: an experimental and numerical study

Breakage behavior of biomass pellets: an experimental and numerical study

Determination of mechanical properties for wood pellets used in DEM simulations

DEM Investigation of the Influence of Particulate Properties and Operating Conditions on the Mixing Process in Rotary Drums: Part 2—Process Validation and Experimental Study

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