Перегляд за Автор "Kornienko, Yaroslav"

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  • Ескіз
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    Increasing the efficiency of transfer processes when using inhomogeneous fluidization
    (КПІ ім. Ігоря Сікорського, 2023) Kornienko, Yaroslav; Haidai, Serhii; Sameliuk, Oleksandr
    The processes of dehydration and granulation are associated with the heat transfer to the solid particles from the gas coolant, which acts as a fluidizing agent and causes the stochastic movement of the granular material in the apparatus. To implement the layered structure mechanism of granulation of organic-mineral fertilizers it is necessary to ensure intensive circulation of granular material with intensive gradual passage through the appropriate technological zones of the apparatus. The main problem is the low efficiency of interphase exchange in the gas-liquid-solid system and the formation of agglomerates during granulation with the injection of a liquid heterogeneous solution into the bed of solid granular material. In this work the conditions for increasing the efficiency of the transfer processes when using an inhomogeneous jet-pulsating mode of fluidization were determined. Analysis of the intensity of renewal of the contact surface of the phases when using inhomogeneous jet-pulsating fluidization in the self-oscillating mode was carried out. It was established that the use of this mode of fluidization allows getting a significant intensification of heat and mass transfer processes due to the activation of diffusion-controlled processes and an increase in the dynamics of interphase contact exchange by 1.9÷2.9 m2/s, which is 27÷41% of the total surface of the material in device.
  • Ескіз
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    Mathematical Modeling of Continuous Formation of Multilayer Humic-Mineral Solid Composites
    (2009) Kornienko, Yaroslav; Raida, Vasyl; Sachok, Roman; Tsepkalo, Oleksiy
    A mathematical model of continuous granulation process of solid multilayer humic-mineral composites in the fluidized bed unit intended for liquid industrial wastes utilization with obtaining of complex granular fertilizers for environmentally safe agriculture was developed and the stabilization terms of the dispersion composition were defined.
  • Ескіз
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    Modeling of heat exchangement in fluidized bed with mechanical liquid distribution
    (Asian Research Publishing Network, 2019-06) Kornienko, Yaroslav; Liubeka, Andrii; Sachok, Roman; Korniyenko, Bogdan
    The uniform distribution of mineral and humic substances throughout the volume of granules in the preparation of organo-mineral fertilizers occurs in the layer-shaped mechanism of granulation. To achieve this goal, the introduction of a multicomponent heterogeneous liquid phase into a fluidized bed medium using a mechanical dispersant. The introduction of a liquid phase in the middle of a fluidized bed with the use of a mechanical disperser of conical type with a perforated surface can significantly increase the volume of the irrigation zone with the simultaneous movement of moist granules from the bowl of the dispersant outside, which eliminates the risk of formation of agglomerates and intensifies the renewal of the contact surface phases in the irrigation zone. The proposed mathematical model adequately describes the process of granulation with the use of a mechanical disperser located inside a layer of a granular material in the application of a pulsating mode of fluidization, which significantly intensifies the diffusion-controlled process in the presence of phase transitions.
  • Ескіз
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    Simulation of hydrodynamics in gas distribution devices for non-homogeneous mode of fluidization
    (КПІ ім. Ігоря Сікорського, 2022) Kornienko, Yaroslav; Serhii Haidai, Pavlo; Yevziutin, Pavlo; Sameliuk, Oleksandr
    An increase in the intensity of diffusion-controlled processes during granulation is provided by apparatuses with nonhomogeneous fluidization, the hydrodynamics of which significantly depends on the structural features of the granulator chamber and the gas distributing device (GDD). The main problem is the formation of stagnant zones on the working surface of GDD, which, when supplying a coolant with temperature that exceeds the melting point of granules, leads to the melting of solids and the termination of the process. In this work, the simulation of hydrodynamics in the granulator chamber was carried out using SolidWorks 2022 SP2 for 4 types of gas distribution devices (GDD) of different configurations with different values of the cross-section coefficient of GDD. The analysis of the simulation results shows that the most significant influence on the hydrodynamic activity index near the surface of GDD iha has the cross-section coefficient of GDD , since even an insignificant increase in the value of φ from 3.0 to 3.5% leads to a significant decrease in the hydrodynamic activity index iha by at least 1.4 times for all considered types of GDD. The simulation of hydrodynamics was carried out without taking into account the presence of solid granular material in the granulator chamber and near the surface of GDD plate.