Semenenko Ye.V., Tepla T.D., Medianyk V.Yu., Roman S.H., Kozhantov A.U. Assessing the dynamic sedimentation stability of structured suspensions made of polydisperse material with different density fraction
- Details
- Parent Category: Geo-Technical Mechanics, 2022
- Category: Geo-Technical Mechanics, 2022, № 161
Geoteh. meh. 2022, 161, 5-13
https://doi.org/10.15407/geotm2022.161.005
ASSESSINGTHE DYNAMIC SEDIMENTATION STABILITY OF STRUCTURED SUSPENSIONS MADE OFPOLYDISPERSE MATERIAL WITH DIFFERENT DENSITY FRACTIONS
1SemenenkoYe.V., 1TeplaT.D, 2Medianyk V.Yu., 2Roman S.H., 3Kozhantov A.
1Institute of Geotechnical Mechanics named by N.Poljakov of National Academy of Sciences of Ukraine, 2National Technical University “Dnipro Polytechnic”, 3Satbayev University
UDC 532.584:532.32:550.385.37
Language: English
Abstract. The current state of the coal industry was analyzed, and it is determined that one of the obstacles to implement mining and utilization of coal beneficiation waste is a high ash content, which reaches almost 90%. Today, different technologies for combusting coal with such ash content in the form of structured suspensions are developed, for example, combustion in fluidized bed boilers, while no technologies are available for transporting structured suspensions with high ash content. At the same time, the results of a number of studies indicate a significant dependence of the rheological characteristics of structured suspensions, especially dynamic sedimentation stability. Therefore, a pressing task is to study the dynamic sedimentation stability of structured suspensions made of high-ash coal of a polydisperse granulometric composition with the addition of mineral particles of different nature. This task is solved by comparing the gravity and repulsion forces, having an ion-electrostatic and Van der Waals nature, with the forces arising when the fluid flows around two particles of different density and size with taking into account the turbulent component and velocity deficits proportional to hydraulic sizes of interacting particles.
Based on the research results, it is for the first time, when the dependence was obtained between the average flow velocity, at which the aggregative stability of structured suspensions is disturbed, and parameters of the energy interaction between particles, size and density of the solid phase particles, geometric dimensions of the pipe, and rheological characteristics of the structured suspensions. It is established that the main factors determining the aggregative stability of structured suspensions transported through the main pipeline are the particle size and nature of solid material, its mineral inclusions, potential of their surfaces, as well as the rheological characteristics of suspensions. It is determined that an increase in the initial tangential stress decreases rate of velocity, as well an increase in the effective viscosity of the structured suspension. However, as the pipe radius increases, this velocity increases.
Keywords: structured suspensions, dynamic sedimentation stability, hydraulic particle size, density of the solid phase particles, aggregative stability.
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About authors:
Semenenko Yevhen Volodymyrovych, Doctor of Technical Sciences (D.Sc), Senior Researcher, Head of Department of Mine Energy Complexes, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.
Tepla Tetyana Dmytrivna, Маster of Science, Senior Engineer of Department of Mine Energy Complexes, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.
Medianyk Volodymyr Yuriіovych, Candidate of Technical Sciences (Ph.D), Associate Professor, Associate Professor of the Department of Mining Engineering and Education, National Technical University “Dnipro Polytechnic” (NTU "DP"), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.
Roman Svitlana Hryhorivna, Master of Science, Department of Mining Engineering and Education, National Technical University “Dnipro Polytechnic” (NTU "DP"), Dnipro, Ukraine.
Kozhantov Arystan Uzakbaievych, Candidate of Technical Sciences (Ph.D), Senior Lecturer, Mining Department, Satbayev University (Non-commercial Joint-Stock Company “Kazakh National Research Technical University named after K.I. Satbaev”, Nur-Sultan, The Republic of Kazakhstan, a.kozhantov@satbayev.university
