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December 2025 (published: 12.12.2025)
Number 4(66)
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Modeling the drying process of quinoa seeds in drum dryer with channel nozzle
Shahov S. V., Rodnishchev Sergey V. , Dmitriev Dmitrij V., Zhuchkov Anatoly V. , Glotova I.A.
Keywords: drying of agricultural crops; mathematical model; quinoa seeds; drum dryer with channel packing; convective drying process
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
Modeling the drying process of quinoa seeds in drum dryer with channel nozzle
The aim of the work is to develop a mathematical model for the process of drying quinoa seeds using a pilot installation of a drum dryer, in which the transverse supply of the drying agent is carried out through the nozzle channels. At the first stage, a physical model of a drum dryer with a channel packing with a two-stage coolant supply system is considered. The total air flow passes through the material to be dried in the first part of the drum from top to bottom and is saturated with water vapor released during its drying. The two-stage coolant supply system allows to reduce air consumption, energy consumption of the unit, and drying time. At the second stage, a mathematical model of the quinoa seed drying process was developed, for which the following assumptions were made: the height of the layer of the material to be dried in the vertical axial plane changes according to a linear law; the particle temperature in the drum is equal to the wet-bulb temperature and the length of the initial section is small compared to the drum length; all the coolant supplied to the drying drum passes through the layer of the material to be dried; the pressure drop across the coolant in the layer and the channel packing is the same in any section along the drum length. It was found that the speed of the heat carrier in the layer along the drum length increases due to a decrease in the hydraulic resistance of the packing – layer system due to a decrease in the height of the layer of dried seeds. The moisture content of the heat carrier leaving the layer of dried seeds along the drum length decreases, and the temperature of the heat carrier increases. The significant temperature gradient is established inside the quinoa seeds. This approach to the controlled dehydration of quinoa seeds allows for the implementation of soft processing modes, the use of which when heating capillary-porous colloidal materials at different temperatures of the processing agent ensures not only the preservation of the natural properties of the materials but also a decrease in heat energy consumption from 10 to 15%.
Keywords: drying of agricultural crops; mathematical model; quinoa seeds; drum dryer with channel packing; convective drying process
DOI 10.17586/2310-1164-2025-18-4-3-17
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License