Influence of technical parameters, work conditions and operating mode on energy efficiency of single-bucket exactor

The influence exerted by the technical parameters, work conditions and operating mode of a single-bucket excavator with front shovel attachment on the average specific power consumption governing the energy efficiency of the machine operation is studied analytically. The study is relevant for the comparison of energy efficiency of excavators with different attachments, as well as for planning and rating of energy and economic performance of shoveling machines and open pit mines. The analytical calculation procedure is developed for the specific power consumption by shovels with regard to specific digging resistance, availability factor, duration of maintenance and additional technological operations, length of organizational downtime and idle time due to external power supply failure. The calculation of the power consumption by excavators includes load of electric drives of basic mechanisms and electrics of auxiliary systems—lighting, heating, airing, maintenance and repair equipment. The article presents the dependences of the specific power consumption on the shift output of excavator EKG8I at the change in the digging resistance within (0.5—2.5) · 105 Pa with operating mode parameters varied in a wide range. The comparison of the calculated and experimental power characteristics of excavator EKG8I in operating conditions of the Vostochno-Beisky open pit mine of SUEK-Khakassia shows that the calculation accuracy is 9–16%. The variation range is set for the excavator capacity and shift utilization factor with the minimum specific power consumption, and the rise in the specific power consumption with decreasing capacity is assessed quantitatively. Furthermore, the decrease in the specific power consumption with increasing availability factor, characterizing reliability of excavator is quantified. It is shown that the use of the variable frequency drive instead of the generator–motor system for basic mechanisms of a single-bucket excavator allows reducing the specific power consumption of the machine by 20–25%. The developed procedure and research findings are applicable in planning and rating of parameters for energy efficiency improvement of excavating machines.

Babokin G. I. Influence of technical parameters, work conditions and operating mode on energy efficiency of single-bucket exactor. MIAB. Mining Inf. Anal. Bull. 2019;(11):199-207. [In Russ]. DOI: 10.25018/0236-1493-2019-11-0-199-207.

G.I. Babokin, Dr. Sci. (Eng.), Professor, e-mail: babokinginov@yandex.ru, National University of Science and Technology «MISiS», 119049, Moscow, Russia.

G.I. Babokin, Dr. Sci. (Eng.), babokinginov@yandex.ru.

1. Poderni R. Yu. Mekhanicheskoe oborudovanie kar'erov [Mechanical equipment of quarries], Moscow, Izd-vo MGGU, 2007, 680 p.
2. Komissarov L. P., Letunova Yu. A., Lukashuk O. A., Teliman I. V. Justification of the working characteristics of a career excavator. Gornoe oborudovanie i elektromekhanika. 2017, no 2, pp. 31—35. [In Russ].
3. Petukhov S. V., Lyakhomskiy A. V., Kuznetsov A. N. Energy technology profiles of excavation work in the development of coal deposits. Gornoe oborudovanie i elektromekhanika. 2017, no 6, pp. 11—16.
4. Levesque M., Millar D., Paraszczak J. Energy and mining — the home truths. Journal of Cleaner Production. 2014. DOI: 10.1016/ j.jelewo. 2013.12.088.
5. Malafeev S. I., Malafeev S. S., Serebrennikov N. A. Modeling of energy processes in mechanical systems of single-bucket excavators. Gornoe oborudovanie i elektromekhanika. 2011, no 5, pp. 24—29. [In Russ].
6. Malafeev S. S. Povyshenie energeticheskoy effektivnosti raboty elektroprivodov mekhatronnykh kar'ernykh mashin s distantsionno-avtomaticheskim upravleniem [Increasing the energy efficiency of electric drives of mechatronic quarry machines with remote-automatic control], Candidate’s thesis, Moscow, 2012, 200 p.
7. Bise C. J. Modern American coal mining: methods and application. Published by SME. Society for Mining, metallurgy and exploration, Inc. 2013. 576 p.
8. Casson M. Dragline for AC motion power / SYMPOHS 2013. 2nd International Symposium on Innovation and Technology in the Phosphate. Procedia Engineering, 2014.09.07. No 83. Pp. 86—89. DOI: 10.10.16/j.proeng. 2014.09.07.
9. Kamalov T. S., Toirov O. Z. Methods of rationing the specific consumption of electrical energy and energy efficiency of mining excavators. Problemy informatiki i energetiki. 2012, no 3—4, pp. 83—92. [In Russ].
10. Kozyaruk A. E., Vasil'ev B. Yu. Methods and means of improving the energy efficiency of machines and technologies with asynchronous electric drives. Vestnik Yuzhno-Ural'skogo gosudarstvennogo universiteta. Energetika. 2015, pp. 115—120. [In Russ].
11. Stefanov V. K., Igumnova S. A., Antonenkov D. V. Specific consumption of electrical energy of career excavators working in the conditions of the Far North. Gornyy informatsionnoanaliticheskiy byulleten’. 2011, no 6, pp. 18—21. [In Russ].
12. Kozyaruk A. E. Directions for improving the energy efficiency of operation of excavator-automotive complexes in open pit mining. Gornoe elektrooborudovanie i elektromekhanika. 2014, no 1, pp. 6—11. [In Russ].
13. Komissarov A. P., Lagunova Y. A., Lukashuk O. A. Evaluation of Single bucketed excavators energy consumption. Procedia Engineering, 2016, vol. 150, pp. 1221—1226.
14. Energosberezhenie. Energoeffektivnost'. Sostav pokazateley. Obshchie polozheniya. GOST R 5154-2000 [Energy saving. Energy efficiency. The composition of the indicators. General provisions. State Standart R 5154-2000].
15. Minav T., Hanneinen H., Sinkkonen A., Lauria L. Electric or hydraulic energy recovery systems in a reach truck — a comparison. Journal of mechanical engineering. 2014. Vol. 60. No 4, pp. 232—240. DOI: 10.5545/sv-jme. 2013. 576 p.
16. Zweiri Y. H., Seneviratne L. D., Althoefer K. Parameter estimation arm using generalised newton method. IEEE Trans No. 4. August 2004. Pp. 762—767.
17. Yoo W. S., Kim O. J. Estimation of maximum lifting load capacities of a exavatorvia multibondy comput KSME. International Journal. 2008. Vol. 12. No. 6. Pp. 1000—1096.
18. Fashchilenko V. N., Reshetnyak S. N. The study of the resonant mode of the electric drive of mining machines. Gornyy zhurnal. 2017, no 7, pp. 80—83. [In Russ].