Criterion equation for the energy efficiency of coal dust precipitation

The urgency of the efficiency improvement in coal dust precipitation is determined by the development of industrial processes. To increase the efficiency of high-pressure dust precipitation the authors suggested a method and a criterion equation for the calculation of the energy efficiency of dust precipitation. The patented design of a hydrovortex nozzle, which enables the significant increase in the effectiveness of the liquid drops dispersion was suggested. The design was based on a mathematical model of interaction between a liquid droplet and a dust particle under the action of the attached vortex induced by rotating liquid droplets. Similarity criteria of dispersion in the spinning motion of liquid droplets were obtained using the theory of similarity and the dimensional analysis. The study shows that the principal criterion characterizing the quality index of a liquid droplet split performed by a hydrovortex nozzle is the Weber number. Furthermore, it specifies the cost efficiency in water and energy for hydrovortex dust suppression. Simulation data test proved the sufficient convergence of the dependence of efficiency enhancement to hydrovortex dust suppression on the angular velocity of drops rotation. It is shown that hydrovortex dust suppression allows to increase the efficiency of dedusting up to 99% by means of the quality of splitting and the increase in the dispersion of liquid droplets. The calculations and experimental studies enabled to increase the efficiency of dispersion by 15%, reducing the average diameter of liquid droplets 2.5 times, thus, abating its consumption by 10%.

Makarov V. N., Ugolnikov A. V., Makarov N. V., Churakov E. O. Criterion equation for the energy efficiency of coal dust precipitation. MIAB. Mining Inf. Anal. Bull. 2022;(112):126-136. [In Russ]. DOI: 10.25018/0236_1493_2022_112_0_126.

V.N. Makarov¹, Dr. Sci. (Eng.), Professor, e-mail: uk.intelnedra@gmail.com, ORCID ID: 0000-0002-3785-5569,
A.V. Ugolnikov¹, Cand. Sci. (Eng.), Assistant Professor, Head of Chair, e-mail: ugolnikov@yandex.ru, ORCID ID: 0000-0002-8442-4841,
N.V. Makarov¹, Cand. Sci. (Eng.), Assistant Professor, Head of Chair, e-mail: mnikolay84@mail.ru, ORCID ID: 0000-0001-7039-6272,
E.O. Churakov¹, Graduate Student, e-mail: gmf.gm@m.ursmu.ru.
¹ Ural State Mining University, 620144, Ekaterinburg, Russia.

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

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