Experimental Investigation and CFD Simulation of Top Spray Fluidized Bed Coating System

Seyedin, Seyed Hadi; Ardjmand, Mehdi; Safekordi, Ali Akbar; Raygan, Shahram

doi:10.3311/ppch.8611

Cited by 6 publications

(6 citation statements)

References 32 publications

(30 reference statements)

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“…The authors in [20] prove the crucial influence of such factors as the height of the fluidized bed and the solid particles circulation on the granule coating process. It is shown that regulation of these parameters leads to a change of the particle coating thickness.…”

Section: Problem Statementmentioning

confidence: 95%

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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Section: Problem Statementmentioning

confidence: 95%

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

Ostroha¹,

Yukhymenko²,

Mandryka³

2023

AMS

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“…The authors in work [11] prove the importance of the influence exerted on the process of coating the granules by such factors as the height of the fluidized bed and the rate of circulation of solid particles in the layer. It is shown that the regulation of these parameters leads to a change in the thickness of the particle coating.…”

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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“…Despite the advantages of CFD tools to predict general flow behavior (see, e.g. [19]), the model setup and the computation requires a significant effort, not to mention parametric runs. The price of high-fidelity results of CFD comes at a price of scenario-based simulation and a lack of general understanding of the tendencies due to parameter variation.…”

Section: Introductionmentioning

confidence: 99%

An Experimental and Numerical Analysis on the Dynamical Behavior of a Safety Valve in the Case of Two-phase Non-flashing Flow

Burhani

Hős

2020

Period. Polytech. Chem. Eng.

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Pressure Relief Valves (PRVs) are key elements of any hydraulic system in the process industry, especially in chemical plants or hydraulic power transmission systems. Their task is to maintain the system pressure beneath a prescribed maximum pressure and vent the excessive fluid in an emergency scenario. This paper addresses the static and dynamic behavior of a Direct Spring-Operated PRV of conical shape in the presence of two-phase non-flashing flow, that is, water-air mixture. First, experimental results on the force and discharge characteristics of such a valve in a wide range of the air-to-water mass fraction are presented. Our test facility includes a custom-designed PRV with 42.5 mm inlet pipe diameter, an inlet pressure up to 6.6 bar(g) and a maximum lift of 10 mm. Additionally, the empirical results on the static characteristics, notably fluid force on the valve disc and discharge coefficients are reported as a function of the liquid mass fraction and valve lift. In the second part of the paper, we present the development of a Matlab-based simulation tool that is capable of predicting the dynamics and stability of such a valve in the case of two-phase, non-flashing, frozen-mixture flow. Moreover, the effect of system parameters, such as spring stiffness and reservoir capacity are recorded. Finally, we also present results on the stability of the opening and closing the multi-phase flow influence on the stability of the blowdown process.

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Experimental Investigation and CFD Simulation of Top Spray Fluidized Bed Coating System

Abstract: Experimentally investigated in this work is the hydrodynamics

Cited by 6 publications

References 32 publications

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

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

An Experimental and Numerical Analysis on the Dynamical Behavior of a Safety Valve in the Case of Two-phase Non-flashing Flow

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