Cooling Process Intensification for Granular Mineral Fertilizers in a Multistage Fluidized Bed Device

Yukhymenko, Mykola; Ostroha, Ruslan; Lytvynenko, Andrii; Mikhajlovskiy, Yakov; Bocko, Jozef

doi:10.1007/978-3-030-50491-5_24

Cited by 5 publications

(6 citation statements)

References 11 publications

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“…Despite the variety of granulation and drying devices (an overview of methods for obtaining granulated dispersed materials is given, for example, in [5][6][7][8][9][10][11][12]), multistage devices with vertical sectioning of the working space did not receive a wide distribution for drying. The effectiveness of such devices has been proven by the example of various classifiers and granular devices [13][14][15][16][17][18], which confirms the relevance of their further implementation in the drying technology. The authors of this work attempted a theoretical description [19], experimental studies of the fluidized bed configuration [20], and the conditions for the implementation of heat-mass transfer processes [21] in other devices with the directed motion of the dispersed phase -vortex granulators [22].…”

Section: Introductionmentioning

confidence: 61%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Artyukhova,

Krmela,

Krmelová

et al. 2021

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The article deals with studying the hydrodynamic characteristics of the fluidized bed in gravitation shelf dryers. The algorithm to calculate hydrodynamic characteristics of the fluidized bed in the dryer's workspace is described. Every block of the algorithm has a primary hydrodynamic characteristics theoretical model of calculation. Principles of disperse phase motion in various areas in the gravitation shelf dryer are established. The software realization of the author's mathematic model to calculate disperse phase motion trajectory in a free and constrained regime, disperse phase residence time in the dryers' workspace, polydisperse systems classification is proposed in the study. Calculations of disperse phase motion hydrodynamic characteristics using the software product ANSYS CFX, based on the author's mathematic model, are presented in the article. The software product enables automating calculation simultaneously by several optimization criteria and visualizing calculation results in the form of 3D images. The disperse phase flow velocity fields are obtained; principles of a wide fraction of the disperse phase distribution in the workspace of the shelf dryer are fixed. The way to define disperse phase residence time91 in the workspace of the shelf dryer in free (without consideration of cooperation with other particles and dryer's elements) and con-strained motion regimes is proposed in the research. The calculation results make a base for the optimal choice of the gravitation shelf dryer working chamber sizes.

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Section: Introductionmentioning

confidence: 61%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Artyukhova,

Krmela,

Krmelová

et al. 2021

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“…Work [38] shows that in the production of granular superphosphate at the stages of pellet processing, energy losses are 5-10 % of the total energy consumption. It has been experi-mentally proven [22] that for a shelf pneumatic classifier, the specific air flow rate is 0.45-0.6 m 3 /kg against 1.1 m 3 /kg for fluidized bed separators. Therefore, the use of a shelf pneumatic classifier operating at lower air consumption is one of the directions for the development of energy-saving technologies for obtaining granular fertilizers.…”

Section: Discussion Of Results Of the Study Of The Regularities Of Th...mentioning

confidence: 99%

“…Therefore, for these purposes, it is most expedient to use a pneumatic classifier of the shelf type. In the shelf apparatus, the granular product is simultaneously cooled on the lower shelf contacts [22]. At the same time, there is no need to install a separate fluidized bed cooler in the technological scheme.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Design of a shelf pneumatic classifier for separating a polydisperse mixture of granulated superphosphate

Yukhymenko

Ostroha

Bocko

2022

EEJET

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The object of this study is a polydisperse mixture of granular superphosphate. It is emphasized that existing technologies of granulation and processing of granules lead to the formation of dusty fractions of small particles. The content of small fractions in the finished product should be minimal and, in connection with this problem, the task is to remove small particles from the mixture. The purpose of the current experimental study is to classify a polydisperse mixture of granular superphosphate in a pneumatic classifier. The device includes an inclined perforated shelf with an unloading space between its end and the wall of the apparatus. It has been experimentally revealed that the maximum efficiency of extraction into the entrainment of small particles is achieved with a width of the discharge space equal to 0.5 of the length of the cross-sectional side of the apparatus; the degree of perforation of the shelf is 5 %; the angle of inclination of the shelf is 25–30°; the speed of the gas flow in the free section of the apparatus is 3.7 m/s. It is shown that the degree of extraction into the entrainment of a small fraction less than 1 mm in size reaches 70–75 %, the content of the small fraction in the carry-over is 96–98 %, and the large fraction is less than 5 %. By processing experimental data, an empirical equation was built that makes it possible to determine the concentration of particles in the gas stream for individual fractions of the material. It is shown that due to the implementation of an active aerodynamic weighing mode, the shelf pneumatic classifier works at specific loads for air flow rate less than the typical designs of fluidized bed separators. It is noted that the effective operation of the shelf pneumatic classifier in the production of granular mineral fertilizers is ensured at a productivity of no more than 10–12 t/h. With greater productivity, there is a need to install several devices in the technological line

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“…Despite the complexity of this spatial-dimension model, the following one-dimensional model with unchanged velocity U 0 and diffusion coefficient D 0 is practically applied in studying problems of filtration through porous medium [27], the energy efficiency of liquidvapor ejectors [28], inertial-filtering separation of gas-liquid mixtures [29], and pneumatic classification of granular material [30]:…”

Section: The Traditional Modelmentioning

confidence: 99%

Parameter Identification of the Fractional-Order Mathematical Model for Convective Mass Transfer in a Porous Medium

Pavlenko,

Ochowiak,

Włodarczak

et al. 2023

Membranes

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Fractional calculus is an essential tool in studying new phenomena in hydromechanics and heat and mass transfer, particularly anomalous hydromechanical advection–dispersion considering the fractal nature of the porous medium. They are valuable in solving the urgent problem of convective mass transfer in a porous medium (e.g., membranes, filters, nozzles, convective coolers, vibrational prillers, and so on). Its solution allows for improving chemical engineering and technology workflows, refining process models for obtaining porous granular materials, realizing the convective cooling of granular and grain materials, and ensuring the corresponding apparatuses’ environmental safety. The article aims to develop a reliable convective mass transfer model for a porous medium and proposes a practical approach for its parameter identification. As a result, a general scientific and methodological approach to parameter identification of the fractional convective mass transfer model in a porous medium was proposed based on available experimental data. It mainly used Riemann–Liouville fractional time and coordinate derivatives. The comprehensive application of the Laplace obtained the corresponding general solution transform with respect to time and a coordinate, the Mittag-Leffler function, and specialized functions. Different partial solutions in various application case studies proved this solution. Moreover, the algorithm for practically implementing the developed approach was proposed to evaluate parameters for the considered model by evaluation data. It was reduced to the two-parameter model and justified by the available experimental data.

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Cooling Process Intensification for Granular Mineral Fertilizers in a Multistage Fluidized Bed Device

Cited by 5 publications

References 11 publications

Bulletin of the Polish Academy of Sciences: Technical Sciences

Bulletin of the Polish Academy of Sciences: Technical Sciences

Design of a shelf pneumatic classifier for separating a polydisperse mixture of granulated superphosphate

Parameter Identification of the Fractional-Order Mathematical Model for Convective Mass Transfer in a Porous Medium

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