Gorobets L.J., Verhorobina I.V. Theoretical aspects of energy consumption acoustic evaluation at the jet grinding
- Details
- Parent Category: Geo-Technical Mechanics, 2020
- Category: Geo-Technical Mechanics, 2020, № 152
Geoteh. meh. 2020, 152, 74-86
https://doi.org/10.15407/geotm2020.152.074
THEORETICAL ASPECTS OF ENERGY CONSUMPTION ACOUSTIC EVALUATIONAT THE JET GRINDING
1GorobetsL.J., 2VerhorobinaI.V.
1National Technical Univercity «Dnipro Polytechnic»,2Institute of Geotechnical Mechanics named by N. Poliakov of National Academy of Sciences of Ukraine
UDC [622.02: 539.2/8]: 620.174.24
Language: Russian
Annotation.
The objective of this work was to develop an acoustic method for evaluating energy consumption during the jet mill operation on the basis of the new generalized physical laws of material dispersion at it destruction. Theoretical explanation is given to the problem of energy consumption diminish in the mode of fine grinding. Dependences between the product dispersion and critical energy density in the course of destruction are described. The acoustic-emissive parameters of dispersion of the samples loaded by compression and results of acoustic estimation of the jet grinding are considered. Interrelation between the gas-jet mill performance and parameters impacting on the energy consumption are analyzed. Grounds are given for using a criterion of extremal control of the working process for maintaining maximal performance. An acoustic size effect of dispersion is formulated by the analogy with dynamic size effect of destruction (DSE). A new approach to evaluation of energy consumed by the jet mill is developed from positions of unity of nature and mechanism of the loaded body destruction with community of manifestation of physical laws of acoustic emission and effects of new surface formation on the destroyed particles. Leading role in the methodology of energy consumption evaluation is given to the coefficient gN (J/imp) of transformation of the consumed energy into acoustic radiation at optimal mode of the mill operations (at maximum performance), which is calculated as a ratio of the reduced work (energy) to the acoustic signal counts in the grinding zone. Current energy consumption ЕDt (J) for period Dt (s) of work is calculated with taking into account coefficient gN (J/imp) and average (for the interval Dt) acoustic activity (imp/s). It is possible to maintain minimum energy consumption at the jet grinding by the snap-acting control of jets loading up to the level of the measured acoustic activity in the grinding zone, at which a “conditionally permanent” value of coefficient gN can be achieved. The results of acoustic evaluation of effective surface energy at optimal grinding mode correspond to the range of estimation gs in the regularity of the DSE destruction. This fact confirms validity of the dispersion theory (including the acoustic size effect) use for evaluating current energy consumption in the course of the jet mill operation.
Keywords:
jet mill, energy density, grinding zone, acoustic activity, loading of jets, dispersion, productivity, energy consumption.
References
1. Gorobets L.Zh. and S.B. Dubrova (1990), “Estimation of power parameters of mountain breeds on the stage of independent destruction”, Deformation and destruction of mine rocks, Bishkek: Ilim, pp. 350-358.
2. Gorobets L.Zh., Bovenko V.N., Dubrova S.V. and Panchenko O.F. (1995), “Research of acoustic emission properties of natural materials in the mode of high pressures”, Physics and echnique of high pressures, no. 3, pp. 65-73.
3. Gorobets L.Zh. (2004), “Development of scientific foundation of the solid minerals grinding”, Abstract of D.Sc. dissertation, Mineral dressing, National Mining University, Dnepropetrovsk, Ukrane.
4. Gorobets L.Zh (1999) “Micropowders: technology and equipment”, Enriching of minerals, no. 4 (45), pp.33-41.
5. Pilov P.I., Gorobets L.Zh., Verhorobina I.V., Bredihin V.E. and Grishakov S.N. (2003), “A production of the micronized materials in the options of the growing a stream shallow”, Tonkoizmelchennye I ultradispersnye materially v promyshlennosti. Proizvodstvo I primenenie [Fine-divided and ultradispersible materials in industry. Production and application], Materialy I mezhdunarodnoy nauchno-prakticheskoy konferentsii [Materials of 1th international research and practice conference], S.-Peterburg, Iva, pp.18-22.
6. Bovenko V.N. and Polunin V.I. (1976), Aperiodicheskiy datchik dlia registretsii akusticheskikh signalov [Aperiodic sensor for registration of acoustic signals], SU, Copyright certificate 512602
7. Pilov P.I., Gorobets L.Zh., Bovenko V.N., Sherbakov A.E. and Verhorobina I.V. (2007), “Parameters of acoustic radiation of the industrial the option of the growing a stream shallow”, Announcer of nationally-technical university “HPI”, Kharkiv, Vol. 27, pp. 33-41.
8. Gorobets V.I. (1972), “Optimization of parameters and development of method of automatic control of gas stream mill”, Abstract of Ph.D. dissertation, Mineral dressing, Dnipropetrovsk Mining Institution name Artem, Dnipropetrovsk, UA.
9. Ivanov A.A., Gorobets V.I. and Gorobets L.Zh. (1972), Sposob avtomaticheskogo regulirovaniia protsessa gazostruinogo izmelcheniia [Method of automatic control of gas stream growing shallow process], SU, Copyright certificate 324069.
10. Gorobets V.I. and Gorobets L.Zh. (1977), “New direction of working researches on growing shallowm”, Bowels of the earth, Moscow, SU, 182 p.
11. Muzika L.V. (2016), “Development of automated control system by the working growing a stream shallow option”, Mineral dressing, National Mining University, Dnipro, no. 63(104), pp. 112-117.
12. Bovenko V.N. (1990), “The synergetics effects and conformities to law of relaxation vibrations in a state of pre-destruction of solid”, Abstract of D.Sc. dissertation, Fiz.mat., Institute MIEM, Moskow, SU.
13. Bovenko V.N., Gerasimov R.U. and Gorobets L.Zh.(2010), “Radio-location spectroscopy of foods of the overmicronizing”, Scientific session NIYAU MIFI, Lemmatas of lectures, in 3 volumes, t.2. Nanophysics and nanotechnologies. Fundamental problems of science, pp. 73-74.
About the authors
Gorobets Larisa Zhanivna, Doctor of Technical Sciences (D.Sc), Professor, National Тechnical University "Dnepr Politech-nique» (NTU “DP”), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .
Verkhorobina Inna Voladymyrivna, Master of Sciences (M.Sc.), Engineer of Department of Geodynamic Systems and Vibration Technologies, Institute of Geotechnical Mechanics name by N. Poliakov of National Academy of Sciences of Ukraine (IGTM, NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .