The exergy analysis of energy efficiency of the technology of granulated phosphorus-potassium fertilizers

Yukhimenko, Nikolay; Vakal, Serhii Vasylovych

doi:10.15587/1729-4061.2016.77182

Cited by 6 publications

(5 citation statements)

References 9 publications

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“…At the same time, a clear classification is provided in shelf pneumatic classifiers at specific loads of 15-20 kg/m 2 s, which significantly exceeds the specific loads of 0.1-1.5 kg/m 2 s for fluidized bed separators. 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.…”

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

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

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 initial mixture of the granulated superphosphate with amount of 3 kg was weighed on an electronic scale with an accuracy of 0.1 g. The mixture was heated to 90-95 • C in the loading hopper with electric heating elements (it corresponds to the temperature at the outlet of the drum granulator dryer [49]) and fed by the belt feeder into the device on the upper shelf. The moisture content of the granules was less than 1 wt% at this temperature, not affecting the heat transfer process [50].…”

Section: Methodsmentioning

confidence: 99%

Multistage Shelf Devices with Fluidized Bed for Heat-Mass Transfer Processes: Experimental Studies and Practical Implementation

et al. 2021

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The article deals with the theoretical description and experimental study of the hydrodynamic and heat transfer properties regarding the operation of multistage gravitational devices of the fluidized bed with inclined perforated shelves. The peculiarities of the work and the implementation field of the multistage shelf units are described. A theoretical model to define the solubilizer’s velocity above the perforation holes, in the above-shelf space of the device and in the outloading gap, as well as the residence time of the dispersed phase at the stage (perforated shelf contact) of the device is presented. The results of experimental studies regarding the influence, made by the structural parameters of the perforated shelf contacts, on the distribution pattern of single-phase and gas-dispersed flows in the workspace of the device, on the intensity of interphase heat transfer are presented. The conditions to create active hydrodynamic operating modes of multistage gravitational shelf devices, which provide higher efficiency of heat-mass transfer processes, and with lower gas consumption and hydraulic resistance compared to typical fluidized bed devices, are proved. Peculiarities regarding the implementation of heat-mass transfer processes in multistage devices are described using heat treatment and drying processes as examples.

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“…The process of applying protective organic shells onto mineral fertilizer granules can be called both encapsulation and granulation, since a significant increase of the initial granule size is observed. Therefore, standard equipment designed for granulation of fertilizers can be used to implement such a process [1][2][3]. However, it should be considered that, unlike mineral substances, organic substance has its own characteristics, which include burning ability, decomposition at high temperatures, increased ability to stick together and lump.…”

Section: Introductionmentioning

confidence: 99%

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

Ostroha¹,

Yukhymenko²,

Mandryka³

2023

Acta Mechanica Slov.

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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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The exergy analysis of energy efficiency of the technology of granulated phosphorus-potassium fertilizers

Cited by 6 publications

References 9 publications

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

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

Multistage Shelf Devices with Fluidized Bed for Heat-Mass Transfer Processes: Experimental Studies and Practical Implementation

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

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