Authors: V.I. Popov

Title of the article: Optimization of freezing and loose processes of the material layer to maintain flowability at negative temperatures

Year: 2025, Issue: 2, Pages: 80-85

Branch of knowledge: 2.8.6. Geomechanics, destruction of rocks by explosion, mine aerogasdynamics and mining thermophysics

Index UDK: 536.21

DOI: 10.26730/1999-4125-2025-2-80-85

Abstract: In the zone of action of negative temperatures of the cooling medium, during transportation and storage of wet bulk materials, its partial or complete freezing occurs, depending on the duration of exposure to negative temperatures. In this case, it becomes necessary to take various preventive measures to ensure the possibility of preserving the bulk properties of the materials used under storage and transportation conditions. Currently, there is a fairly wide range of various measures, including the use of various salts that reduce the freezing temperature of the cargo, hydrophobic additives that replace direct contact between wetted particles of the cargo with oil layers, as well as the use of reagents that have a higher degree of adhesion to particles of bulk cargo and replace contact with them of water films. The extreme and difficult to achieve measure is the complete elimination of the freezing component - water - from the systems under consideration. The practical analogue of this method is freezing a layer of wet material with subsequent loosening (mixing) as the most accessible and simple in technical implementation. A mathematical model of the process of freezing a layer of wet bulk material has been developed within the framework of the dynamic programming method. The procedure of loosening (mixing) the material layer and the moment of its application have been adopted as a control action. A program has been developed - a digital twin of the process of freezing a layer of material, with the help of which the optimal moment of application of the loosening (mixing) procedure has been determined for cargo layers of different thicknesses, at different values ​​of the temperature of the cooling medium. This approach allows to significantly, by 2-3 times, reduce the time of preliminary freezing of cargo in preparation for transportation or storage compared to the natural course of the freezing process (without mixing).

Key words: freezing of bulk material digital twin optimization mixing control action

Receiving date: 10.10.2024

Approval date: 22.04.2025

Publication date: 11.06.2025

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