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, Issue 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.
REFERENCES:
1. Krut, O.A. (2002), Vodovuhilne palyvo [Hydrocarbon fuel], Naukova dumka, Kyiv, Ukraine
2. Dyakun, I.L. (2014), Povyshenie effektivnosti energeticheskoy pererabotki uglya [Increasing the efficiency of energy processing of coal], Naukova dumka, Kyiv, Ukraine
3. SvItliy, Yu.G. and Krut, O.A. (2010), GIdravlIchniy transport tverdih materIalIv [Hydraulic transport of solid materials], ShIdniy vidavnichiy dIm, Donetsk, Ukraine.
4. Kyrychko, S.M. and Demchenko, T.D. (2020), Vibіr perspektivnih bіotehnologіy ta obgruntuvannya tehnologіchnih rіshen, spryamovanih na pokraschennya ekologіchnogo stanu navkolishnogo seredovischa shovisch vіdhodіv vuglezbagachennya [Selection of promising biotechnologies and substantiation of technological solutions aimed at improving the environmental condition of coal enrichment waste storage facilities] № ДР0119U102430, M.S. Poljakov Institute of Geotechnical Mechanics NAS of Ukraine, Dnipro, Ukraine.
5. Svitliy, Yu.G. and Biletskiy, V.S. (2009), GIdravlIchniy transport [Hydraulic transport], ShIdniy vidavnichiy dIm, Donetsk, Ukraine.
6. Kyrychko, S.M. (2016), Substantiation of parameters of processes of hydromechanization of mining works at use of hydromixtures of high concentration, Ph.D. Thesis, M.S. Poljakov Institute of Geotechnical Mechanics NAS of Ukraine, Dnipro, Ukraine.
7. Shvornуkova, G.M. (2010), Reduction of energy costs for the transportation of hydrocarbon fuel by improving the processes and modes of operation of hydrotransport systems, Ph.D. Thesis, Mining, Volodymyr Dahl East Ukrainian National University, Lugansk, Ukraine.
8. Aleksandrov, V.I. (2000), Metody snizheniya energozatrat pri gidravlicheskom transportirovanii smesey vysokoy kontsentratsii [Methods of reducing energy consumption in hydraulic transportation of mixtures of high concentration], SPGGI (TU), St. Petersburg, Russia.
9. Smoldyrev, A.Ye. and Safronov, Yu.K (1989), Truboprovodniy transport kontsentrirovannykh gidrosmesey [Pipeline transportation of concentrated slurries], Mashinostroenie, Moscow, USSR.
10. Murko, V.I. (1999), Scientific basis for the processes of obtaining and effective use of water-coal suspensions, Abstract of D. Sc. Dissertation, Moscow, Russia.
11. Biletskyi, V.S., Krut, O.A. and Vlasov, Yu.F. (2006), “Rheological characteristics of water-coal suspensions depending on the quality of the initial coal”, Vistnik Krivorizkogo tehnIchnogo universitetu. no. 11. рр. 49–55.
12. Kostovetsky, S.P., Murko, V.I. and Olofinsky, E.P. (1989), “Some results of research on the processes of preparation, transportation and direct combustion of water-coal suspension”, Sb. nauchn. tr. NPO Gidrotruboprovod: seriya Voprosyi opredeleniya tehnologicheskih parametrov lineynoy chasti gidrotransportnyih system,. рр. 4–10.
13. Samoilik, V.G. (1992), Development of a technology for obtaining a solid phase of water-coal fuel with an appropriate level of ash content, Abstract of Ph.D. dissertation, Dnepropetrovsk, Ukraine.
14. Samoilik, V.G., Elishevich, A.T. and Makarov, A.S. (1990), “Influence of the composition of mineral impurities on the rheological properties of water-coal suspensions”, Himiyatverdogotopliva, no.5. рр. 76–81
15. Maystrenko, A., Dunaevska, N, and Fridman, M. (1988), “Results of experiments on dust combustion of Ukrainian anthracites”, Vozmozhnostimodernizatsiiukrainskihugolnyihelektrostantsiy, delovyievozmozhnostiipotrebnostvinvestitsiyah: ukrainsko-amerikanskayaob'edinyonnayakonferentsiya, Kyiv, Ukraine, рр. 121–125.
16. (1997), “Program for the development and implementation of technologies for the industrial use of sludge, improving the environmental situation in coal-mining regions and averting possible emergency situations associated with tailings dam breaches”, Rozroblena vіdpovіdno do Postanovi Kabіnetu Mіnіstrіv Ukraуini vіd 28.03.97. № 280 «Pro hіd strukturnoуi perebudovi vugіlnoнi promislovostі», Minvugleprom Ukrayini, Kyiv, Ukraine.
17. (1998), “Environmental aspects of resource supply of energy security”, Delovoy vestnik, no.9. рр. 4–10.
18. Yashchenko, Yu. (2004), “Study of the coal industry of Ukraine and ways to overcome the industry crisis”, Shid, no.5 (12). рр. 12–21.
19. Ohki, Akira (1995), “Adsorption Behavior of Polyanion Additives and Coal-Water Mixture Properties”, Coal Utilization & Fuel Systems: The Proceedings of the 20-th Intern. Techn. Conf., Mаrch 1995, Clearwater, Florida, USA, pp. 75–85.
20. Randell, J.K., Henry, C.D. and Butt, B. (1995), “Recovery of Fine Coal and Reclamation of Coal Slurry Impoundments”, Coal Utilization & Fuel Systems: The Proceedings of the 20-th Intern. Techn. Conf., Mаrch 1995, Clearwater, Florida, USA, pp. 583–594.
21. Sastrawinata, T. (1996), “Current Status of Coal Water Slurry Techno-logy in Indonesia and its Prospects”, Coal Utilization & Fuel Systems: The Proceedings of the 21-st Intern. Techn. Conf., Mаrch 1996, Clearwater. Florida, USA, pp. 821–828.
22. Semenenko, Ye.V., Demchenko, T.D. and Ryzhova, S.A. (2016), “Investigation of the dynamic sedimentation stability of structured suspensions under the action of turbulent pulsations”, Geotekhnicheskaya Mekhanika [Geo-Technical Mechanics], no. 130, pp. 115–124.
23. Krut, A.A. (2001), “High-ash coal sludge - an additional source of energy”, Zb. naukovihpracDNTU: serіjaelektrotehnіkataenergetika, no. 21, рp. 34–37.
24. Terenzi, A. (1996), “Rheological Properties and Setting Behaviour Influences in CWS Pipeline Flow”, Coal Utilization & Fuel Systems: The Proceedings of the 21-st Intern. Techn. Conf., Mаrch, Clearwater, Florida 1996, USA, pp. 645–656.
25. Papayani, F.A. and Switly, Y.G. (1995), “Utilization of Coal-Water Fuel in Heat Power Industry and by Public Utilities of Ukraine”, Coal Utilization & Fuel Systems: The Proceedings of the 20-th Intern. Techn. Conf., Mаrch 1995, Clearwater, Florida, USA, pp. 193–202.
26. Gaved, A. (1995),”Cashing in Coal’s Liquid Assets”, World Coal, February. pp. 19–28.
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
