Revealing the effect of decreased energy intensity of grinding in a tumbling mill during self-excitation of auto-oscillations of the intrachamber fill

Authors

DOI:

https://doi.org/10.15587/1729-4061.2019.155461

Keywords:

tumbling mill, intrachamber fill, impact action, auto-oscillation self-excitation, energy intensity of grinding

Abstract

We have investigated a possibility to perform comparative evaluation of the effectiveness of grinding process in a tumbling mill under conventional steady and self-excited auto-oscillatory flow modes of the intrachamber fill.

A mathematical model for the parameters of impact influence of the milling fill on the ground material has been constructed. We applied an analytical-experimental method to visually analyze flow patterns in the cross-section of a rotating chamber.

Numerically, by using approximate procedures, we have established a dynamic effect of increasing mean sums of vertical components in impact pulses and mean sums of power of such components at self-excitation of auto-oscillations.

The technological effect has been experimentally established of a significant decrease in energy intensity and a certain increase in productivity of the identified self-oscillatory grinding process, compared with the characteristics of conventional steady-state process. This involved a sieve analysis of the ground product, as well as measuring the fill flow turnover and the power of a drum rotation drive.

The example considered was the process of grinding cement clinker at a degree of filling the chamber with a fill of 0.45, at a relative size of ball grinding elements of 0.026, while the gaps between grinding bodies were completely filled with the ground material. It was established that at auto-oscillation self-excitation the grinding energy intensity reduces by 27.2 %, while performance increases by 6.7 %.

The effects established in this work make it possible to predict the rational parameters for aself-oscillatory process of grinding in a tumbling mill

Author Biographies

Kateryna Deineka, Technical College National University of Water and Environmental Engineering Soborna str., 11, Rivne, Ukraine, 33028

PhD

Yurii Naumenko, National University of Water and Environmental Engineering Soborna str., 11, Rivne, Ukraine, 33028

Doctor of Technical Sciences, Associate Professor

Department of Construction, Road, Reclamation, Agricultural Machines and Equipment

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Published

2019-02-04

How to Cite

Deineka, K., & Naumenko, Y. (2019). Revealing the effect of decreased energy intensity of grinding in a tumbling mill during self-excitation of auto-oscillations of the intrachamber fill. Eastern-European Journal of Enterprise Technologies, 1(1), 6–15. https://doi.org/10.15587/1729-4061.2019.155461

Issue

Vol. 1 No. 1 (2019): Engineering technological systems

Section

Engineering technological systems

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Copyright (c) 2019 Kateryna Deineka, Yurii Naumenko

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