Experimental studies on the efficiency of hydrovortex dust suppression

Open-pit and underground mining performed using modern high-capacity technological equipment not only enhances the workings, but also induces the sudden increase in coal dust concentration in faces. At the same time, the proportion of fine coal dust, which is the most dangerous in terms of sanitary-hygienic requirements and explosion safety, significantly increases. Studies have shown that the degree of cleavage of the dust and gas mixture increases with the growth of the load in the working face, which is dangerous in terms of the emergence of large local concentrations of coal dust. The primary way to reduce dust formation in underground mines and quarries is water aerosol dust suppression. This dust collection system is not able to quickly reduce the level of dustiness to the permitted values in conditions of local concentration of coal dust. Theoretical and experimental studies of methods and means of increasing the effectiveness of hydrovortex dust suppression are relevant. They require the development of new approaches, the implementation of assessment methods for accuracy, the ability to generalize the results of studies at certain mining enterprises in industry as a whole. For this purpose, an assembly with a patented hydrovortex nozzle design was created and used. The results of experimental studies conducted on the proposed assembly were repeatedly compared with the calculations based on the developed mathematical model, thus proving the high efficiency of hydrovortex dust suppression for particles with a median diameter of less than 2·10−6 m, providing capture efficiency of not less than 75 per cent at the same liquid pressure and flow rate reduced by 10 per cent. The mathematical model error did not exceed 8 per cent with a reliability of 0.95.

Ugolnikov A. V., Makarov V. N., Makarov N. V., Dyldin D. P. Experimental studies on the efficiency of hydrovortex dust suppression. MIAB. Mining Inf. Anal. Bull. 2023;(12−1):134—148. [In Russ]. DOI: 10.25018/0236_1493_2023_121_0_134.

Makarov V. N.¹, Dr. Sci. (Eng.), Professor at the department of Mining Mechanics, e-mail: uk.intelnedra@gmail.com, ORCID ID: 0000-0002-3785-5569;
Ugolnikov A. V.¹, Cand. Sci. (Eng.), Associate Professor, Head of the Department of Electrical Engineering, e-mail: ugolnikov@yandex.ru, ORCID ID: 0000-0002-8442-4841;
Makarov N. V.¹, Cand. Sci. (Eng.), Associate Professor, Head of the Department of Mining Mechanics, e-mail: mnikolay84@mail.ru, ORCID ID: 0000-0001-7039-6272;
Dyldin G. P.¹, Cand. Sci. (Eng.), Associate Professor of the Department of Mining Mechanics, e-mail: German.Dyldin@m.ursmu.ru.
¹ Ural State Mining University, 620144, Yekaterinburg, Russian Federation.

A. V. Ugolnikov, e-mail: ugolnikov@yandex.ru.

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