Smolensk Branch of the National Research University “Moscow Power Engineering Institute” (Smolensk, Russia)

V. I. Bobkov, Dr. Eng., Associate Prof., Head of the Dept. of Higher Mathematics, e-mail: vovabobkoff@mail.ru
M. I. Dli, Dr. Eng., Prof., Head of the Dept. of Information Technologies in Economics and Management, e-mail: midli@mail.ru
V. A. Orekhov, Assistant, e-mail: fundukoff@mail.ru

Plekhanov Russian University of Economics (Moscow, Russia)
N. S. Kulyasov, Cand. Econ., Leading Researcher, Scientific and Methodological Center “Higher School of Tariff Regulation”

The paper presents the experimental thermogravimetric unit for determination of the efficient heat transfer coefficient during drying and roasting of sintering charge from iron ore lump and pelletized raw material within the temperature ranges and aerodynamic conditions of the operating roasting conveyor machines, during complicated and power-intensive chemical-metallurgical process of iron ore raw material roasting in a moving dense layer with cross feed of the heat-transfer gas. The techniques for experimental determination of the efficient heat transfer coefficient during drying of iron ore pellets and charge in the dense layer are analyzed. It was scientifically substantiated that two periods should be underlined during drying of capillary-porous bodies (e.g. iron ore pellets); these are the periods of permanent and dropping drying rate. It was found out that moisture evaporation from the surface of a wet body during the first drying period occurs in the same way, as from free water surface, and according to the same laws. The temperature of a drying body does not increase practically, because transferred heat is consumed for evaporation until the whole free (capillary) moisture will evaporate. It was established that the second period starts from evaporation of bonded moisture, and drying rate is determined mainly by steam diffusion inside a wet body. Two independent methods were revealed on the base of analysis of the techniques for experimental determination of the efficient heat transfer coefficient. One of these methods is based on enthalpy variation of a drying agent, and another – on weight variation of a wet iron ore sample. It is noted that the experimental thermogravimetric unit, which was designed by the authors, allows to implement both of these methods. The error of variation of the efficient heat transfer coefficient is evaluated.

The study was performed within the framework of the state assignment, project number FSWF-2023-0012.

1. Bobkov V. I., Dli M. I., Sokolov A. M., Rubin Y. B. Analysis of chemical-metallurgical agglomeration processes during charge sintering. CIS Iron and Steel Review. 2020. Vol. 20. pp. 7–11.
2. Shekhovtsov V. V., Vlasov V. A., Skripnikova N. K., Semenovykh M. A. Structure Formation of Concrete Systems Modified By Nonstandard Particles. Russian Physics Journal. 2021. Vol. 63 (9). pp. 1590–1595.
3. Meshalkin V. P., Belyakov A. V., Butusov O. B., Burukhina T. F., Khodchenko S. M., Garabadzhiu A. V., Doví V. G., Bobkov V. I. State of the art and research development prospects of energy and resourceefficient environmentally safe chemical process systems engineering. Mendeleev Communications. 2021. Vol. 31. No. 5. pp. 593–604.
4. Zhu X., Ji Y. A digital twin–driven method for online quality control in process industry. International Journal of Advanced Manufacturing xTechnology. 2022. Vol. 119 (5–6). pp. 3045–3064.
5. Tomtas P., Skwiot A., Sobiecka E., Obraniak A, Lawinska K., Olejnik T. P. Bench Tests and CFD Simulations of Liquid–Gas Phase Separation Modeling with Simultaneous Liquid Transport and Mechanical Foam Destruction. Energies. 2021. Vol. 14 (6). 1740. DOI: 10.3390/en14061740
6. Ivanova S. V., Neshporenko E. G., Kartavtsev S. V. Energy balances the process thermal decomposition methane in cooling conditions high-temperature technological installations. IOP Conference Series: Earth and Environmental Science. Series “International Science and Technology Conference “Earth Science””. 2021. p. 012135.
7. Li J., An H.-F., Liu W.-X., Yang A.-M., Chu M.-S. Effect of basicity on metallurgical properties of magnesium fluxed pellets. Journal of Iron and Steel Research International. 2020. Vol. 27 (3). pp. 239–247.
8. Kavchenkov V. P., Kavchenkova E. V., Chernenkov I. D. Modeling of the relationship between the earth population growth and the electric energy production processes. Journal of Applied Informatics. 2021. Vol. 16. No. 4 (94). pp. 110–121.
9. Wang S., Guo Y., Zheng F., Chen F., Yang L. Improvement of roasting and metallurgical properties of fluorine-bearing iron concentrate pellets. Powder Technology. 2020. Vol. 376. pp. 126–135.
10. Nayak D., Ray N., Dash N. et al. Induration aspects of low-grade ilmenite pellets: Optimization of oxidation parameters and characterization for direct reduction application. Powder Technology. 2021. Vol. 380. pp. 408–420.
11. Kossoy A. Effect of thermal inertia-induced distortions of DSC data on the correctness of the kinetics evaluated. Journal of Thermal Analysis and Calorimetry. 2021. Vol. 143. No. 1. pp. 599–608.
12. Kurilin S. P., Sokolov A. M., Prokimnov N. N. Computer program for simulation pf technical state parameters of electromechanical systems. Prikladnaya informatika. 2022. Vol. 17. No. 2. pp. 105–119.
13. Tian H., Pan J., Zhu D., Wang D., Xue Y. Utilization of Ground Sinter Feed for Oxidized Pellet Production and Its Effect on Pellet Consolidation and Metallurgical Properties. Minerals, Metals and Materials Series. 11^th International Symposium on High-Temperature Metallurgical Processing. 2020. pp. 857–866.
14. Matkarimov S. T., Berdiyarov B. T., Yusupkhodjayev A. A. Technolo gical parameters of the process of producing metallized iron concentrates from poor raw material. International Journal of Innovative Technology and Exploring Engineering. 2019. Vol. 8 (11). pp. 600–603.
15. Puchkov A. Yu., Lobaneva E. I., Kultygin O. P. Algorithm of predicting the parameters of processing system for wastes of apatite-nepheline ores. Prikladnaya informatika. 2022. Vol. 17. No. 1. pp. 55–68.
16. Yuryev B. P., Dudko V. A. Process development for integrated use of metallurgical production wastes. Materials Science Forum. 2022. Vol. 1052 MSF. pp. 262–266.
17. Akberdin A. A., Kim A. S., Sultangaziev R. B. Experiment Planning in the Simulation of Industrial Processes. Steel in Translation. 2018. Vol. 48 (9). pp. 573–577.
18. Dli M. I., Vlasova E. A., Sokolov A. M., Morgunova E. V. Creation of a chemical-technological system digital twin using the Python language. Journal of Applied Informatics. 2021. Vol. 16. No. 1 (91). pp. 22–31.
19. Ming Yan, Xinnan Song, Jin Tian, Xuebin Lv, Ze Zhang, Xiaoyan Yu and Shuting Zhang. Construction of a New Type of Coal Moisture Control Device Based on the Characteristic of Indirect Drying Process of Coking Coal. Energies. 2020. Vol. 13 (16). 4162. DOI: 10.3390/en13164162
20. Matyukhin V. I., Yaroshenko Y. G., Bragin V. V. Sintered ironore manufacturing capabilities when using combined fuel. Steel in Translation. 2019. Vol. 49. No. 11. pp. 771–777.
21. Vodolazskiy F. V., Illarionov A. G., Ryzhkov M. A. Evolution of phase composition and thermal expansion during heating of VT23 titanium alloy. Materials Science Forum. 2022. Vol. 1052 MSF. pp. 147–153.
22. Belyakov N. V., Nikolina N. V. Plant protection technologies: From advanced to innovative. Journal of Physics: Conference Series. 2021. Vol. 1942 (1). 012072.
23. Bobkov V., Meshalkin V., Aristov V., Dli M. Environmental technology for processing waste from mining and processing plants. IOP Conference Series: Earth and Environmental Science. 2020, Vol. 578 (1). 012002.
24. Shvydkii V. S., Kudelin S. P., Gurin I. A., Noskov V. Y. Development of an information modeling system of coal-dust fuel injection into tuyeres of a blast furnace. Steel in Translation. 2019. Vol. 49. No. 12. pp. 854–861.
25. Shvydkii V. S., Yaroshenko Y. G., Spirin N. A., Lavrov V. V. Modeling of metalized pellets firing with the account of physicochemical transformations in them. Izvestiya Ferrous Metallurgy. 2018. Vol. 61 (4). pp. 288–293.
26. Tian Y., Qin G., Zhang Y., Zhao L., Yang T. Experimental research on pellet production with boron-containing concentrate. Characterization of Minerals, Metals, and Materials. 2020. pp. 91–102.
27. Dli M. I., Bobkov V. I., Kulyasov N. S., Sokolov A. M. Features of research of iron ore thermal decarbonization kinetics during roasting. CIS Iron and Steel Review. 2021. Vol. 22. pp. 7–11.
28. Bobkov V. A., Dli M. I., Rubin Y. B. Influence of the conditions of internal heat exchange on the process of thermal decomposition of carbonates in iron ore raw materials. CIS Iron and Steel Review. 2022. Vol. 24. pp. 4–8.