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, Issue 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 g_N (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 Е_Dt (J) for period Dt (s) of work is calculated with taking into account coefficient g_N (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 g_N can be achieved. The results of acoustic evaluation of effective surface energy at optimal grinding mode correspond to the range of estimation g_s 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

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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. .

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