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Date submitted2022-06-20
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Date accepted2022-10-10
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Date published2022-11-03
Monitoring of grinding condition in drum mills based on resulting shaft torque
Grinding is the most energy-intensive process among all stages of raw material preparation and determines the course of subsequent ore beneficiation stages. Level of electricity consumption is determined in accordance with load characteristics forming as a result of ore destruction in the mill. Mill drum speed is one of process variables due to which it is possible to control ore destruction mechanisms when choosing speed operation mode of adjustable electric mill drive. This study on increasing energy efficiency due to using mill electric drive is based on integrated modelling of process equipment – grinding process and electromechanic equipment – electric drive of grinding process. Evaluating load torque by means of its decomposition into a spectrum, mill condition is identified by changing signs of frequency components of torque spectrum; and when studying electromagnetic torque of electric drive, grinding process is monitored. Evaluation and selection of efficient operation mode of electric drive is based on the obtained spectrum of electromagnetic torque. Research results showed that with increasing mill drum speed – increasing impact energy, load torque values are comparable for the assigned simulation parameters. From the spectra obtained, it is possible to identify mill load condition – speed and fill level. This approach allows evaluating the impact of changes in process variables of grinding process on parameters of electromechanical system. Changing speed operation mode will increase grinding productivity by reducing the time of ore grinding and will not lead to growth of energy consumption. Integration of digital models of the technological process and automated electric drive system allows forming the basis for developing integrated methods of monitoring and evaluation of energy efficiency of the entire technological chain of ore beneficiation.
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Date submitted2021-10-14
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Date accepted2022-01-24
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Date published2022-04-29
Monitoring of compressed air losses in branched air flow networks of mining enterprises
Compressed air as a type of safe technological energy carrier is widely used in many industries. In economically developed countries energy costs for the production and distribution of compressed air reach 10 % of the total energy costs. The analysis of compressed air production and distribution systems in the industrial sector shows that the efficiency of the systems is at a relatively low level. This is due to the fact that insufficient attention is paid to these systems since the compressed air systems energy monitoring has certain difficulties – the presence of complex and branched air pipeline networks with unique characteristics; low sensitivity of the equipment which consumes compressed air; the complexity of auditing pneumatic equipment that is in constant operation. The article analyzes the options for reducing the cost of production and compressed air distribution. One of the promising ways to reduce the compressed air distribution cost is timely detection and elimination of leaks that occur in the external air supply network of the enterprise. The task is solved by hardware-software monitoring of compressed air pressure at key points in the network. The proposed method allows real-time detecting of emerging air leaks in the air duct network and sending commands to maintenance personnel for their timely localization. This technique was tested in the industrial conditions of ALROSA enterprises on the air pipeline network of the Mir mine of the Mirninsky Mining and Processing Plant and showed satisfactory convergence of the calculated leakage values with the actual ones. The practical significance of the obtained results is that the developed method for monitoring air leaks in the air duct network is simple, it requires an uncomplicated software implementation and allows to localize leaks in a timely manner, thereby reducing unproductive energy costs at the enterprises.
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Date submitted2019-03-17
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Date accepted2019-05-21
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Date published2019-08-23
Impact of External Factors on National Energy Security
- Authors:
- V. L. Ulanov
- E. Yu. Ulanova
The article examines both external and internal threats to national energy security, formulates the tasks of increasing energy security, discloses modern challenges, as well as measures to level them. In recent years, Russian economy has felt the growing influence of external threats and risks: unfair competition in world markets, high politicization of energy issues, and attempts to prevent Russia from monetizing national energy reserves. Influence of the use of renewable energy sources on national energy security, growth of liquefied natural gas production, stricter environmental requirements, changes in the demand for petroleum products, and introduction of anti-Russian sanctions are analyzed. The influence of internal risks is no less significant: quality of hydrocarbon reserves in the Russian Federation is declining, effectiveness of geological exploration is insufficient, and the share of hard-to-recover reserves is increasing. Energy security assessments are recommended taking into account modern challenges and on the basis of parameters such as ratio of the annual increase in the balance values of primary fuel and energy resources to the volume of their production, share of natural gas in the balance structure of primary fuel and energy resources, implementation of investment programs by fuel and energy sectors, change in the specific energy intensity of GDP, prices and etc.
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Date submitted2018-09-08
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Date accepted2018-11-01
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Date published2019-02-22
Complexation of telecommunications and electrical systems in mines and under-ground facilities
- Authors:
- V. A. Shpenst
The possible options for the integration of telecommunications and electrical systems of mining enterprises are considered. Based on an analysis of the current state and prospects for the development of telecommunications systems, various technical solutions are proposed for sharing the power supply networks available in mines and underground structures in order to solve the problems of telecommunication, automate process control and ensure the safety of operations. The analysis of the possibilities of applying the PLC technology in underground structures and mines for solving specific telecommunication problems has been carried out, and examples of their possible technical and hardware implementation are given.
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Date submitted2017-09-14
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Date accepted2017-11-23
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Date published2018-02-22
Providing energy decoupling of electric drive and electric grids for industrial electrical installations
Subjects of the research are industrial electric drives, witch maintain the operation of main actuating units of production machines and installations during the development of mineral resource deposits. The goal is to research the possibility to ensure the energy decoupling of industrial electric drives and electric grid by means of structural implementation of active rectifiers into frequency converters. The main purpose of energy decoupling is to eliminate the negative impact of low quality electric energy and changes in energy parameters on electric drive operation. In order to accomplish energy decoupling of electric drive with active rectifier, methods of mathematical and simulation modeling with mathematical application software package were used. The integrated simulation model with two electric drives, including active rectifier (energy decoupled electric drive) and diode rectifier (standard type electric drive), were created. Simulation model is provided with tools for oscillographic testing and analysis of the impact of power quality parameters on frequency converters and drive motors operation. The analysis of effectiveness of energy decoupling by means of active rectifier of frequency converter shows that drive motor completely retains the stability and controllability of rotation frequency and torque during the changes of power quality parameters in electric grid. The use of active rectifier allows to ensure the operation of electric drive in required mode in case of voltage decrease by 30 % with normative value of 5-10 %, i.e. energy decoupling provides high stability margin for voltage. Electric drive with active rectifier ensures energy decoupling in case of asymmetry of supply voltage. The control of mechanical variables of induction motor during offsets in amplitude and frequency in all phases of electric grid is ensured to be on required level.
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Date submitted2015-12-18
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Date accepted2016-02-01
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Date published2016-12-23
Simulation of onboard power supply system for small hydrographic vessel «Vaygach»
- Authors:
- I. A. Pankov
- V. Ya. Frolov
Computer simulation is a method resorted to more and more frequently for the development of the prospective power supply systems, in particular the vessel power supply system. It provides valuable insights into the transient processes and indicators of electric power quality in the system without building its physical model, thus significantly improving the efficiency and quality of the physical model. Nowadays MathLab package with Simulink application is used with increasing frequency for simulation of such systems. The paper presents a model of the power supply system of small hydrographic vessel ‘Vaygach’ built in MatLab environment. The system vulnerabilities and their remedies have been identified. Changes in sinusoid before and after the non-linear load on the network have been demonstrated and solutions for improving the non-linear distortion factor are proposed. The model developed for the vessel power supply system can be used for building models of different vessels.
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Date submitted2015-07-13
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Date accepted2015-09-10
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Date published2016-02-24
Problems of ensuring energy security for enterprises from the mineral resources sector
- Authors:
- B. N. Abramovich
- Yu. A. Sychev
A complex of technical means and decisions for ensuring adequate level power safety at mineral resources enterprises has been developed, including voltage mode control method, power quality improvement method, method of ensuring dynamic stability for electricity-generating equipment, method of enhancing power supply reliability, distributive network structure control method, and method of combined use of alternative and renewable energy sources. The necessity of ensuring power safety for the objects of the mineral resources sector, from the technical point of view – with the application of modern achievements and developments in the area of electrical complexes and systems, has been proved.
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Date submitted2014-11-18
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Date accepted2015-01-04
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Date published2015-10-26
A new stage in the development of the european natural gas market as a reflection of transition to national state capitalizm
- Authors:
- N. G. Privalov
- T. B. Li
This article is devoted to the analysis of a situation and tendencies of development in the European natural gas market. The evolution of «energetic doctrine» models – from domination of great state monopolies to a competitive energetic doctrine – has been happening for the last 60 years. «The new global energetic doctrine» which includes state and interstate regulation strengthening is being formed now. An aggravation of contradictions in the natural gas market is a manifestation of a new stage in the mixed economy formation – the national state capitalism.
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Date submitted2009-08-01
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Date accepted2009-10-23
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Date published2010-02-01
Influence of detonation parameters of explosives on energy efficiency of explosive destruction of rocks
- Authors:
- M. G. Menzhulin
- P. I. Afanasev
- A. V. Trofimov
About 30 % of the mountain weight extracted on rubble the enterprises, at explode and the subsequent mechanical crushing, the fraction less makes than5 mm(elimination) which practically does not find selling and litters an environment. The output of elimination is influenced essentially with detonation characteristics explosives.
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Date submitted2008-11-08
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Date accepted2009-01-08
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Date published2009-12-11
The main targets of strategic planning of the Russian vertically-integrated oil-gas companies
- Authors:
- A. V. Zhimirova
The article discusses main goals and targets of strategic planning in oil companies considering the example of leading vertically-integrated oil-gaz companies. The impact of oil industry on the country’s macroeconomic indices is shown. Besides, main directions of big companies’ activity are analyzed. Special corporate features considered in the companies’ strategic plans should be correlated with the State Energy strategy.