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.
In the article the basic principles of energy conservation and efficiency of the enterprises of metallurgy. The analysis of the energy saving potential in the metallurgical complex. We describe the stages of implementation of energy management, energy analysis of the structure of the enterprise.
In the case of phosphoric furnace the influence of changes in voltage and current to the power distribution in ore-smelting furnaces between the arc shunt resistance and melt are considers.
The method of diagnostics and estimation of a residual resource of the electromechanical equipment, based on the analysis of electric parameters is offered. Block diagram’s of a diagnostic complex and the data processing program are presented. The way of application of artificial neural networks for data processing of diagnostics and an estimation of a residual resource is considered, and also levels of influence of damages on working capacity of the equipment are resulted.
Представлен обзор существующих методов технической диагностики промышленного электрооборудования, приведены выражения для определения основных диагностических показателей при диагностике состояния оборудования по электрическим параметрам.
Рассмотрены проблемы повышения надежности электроснабжения распределительных сетей среднего напряжения на горных предприятиях. Показано, что внедрение децентрализованной системы с применением автоматических пунктов секционирования значительно снижает недоотпуск электроэнергии. Приведены алгоритмы децентрализованного управления аварийными режимами работы сети.
Mathematical model of induction motor with installation of longitudinal capacitive compensation is considered. Starting modes of asynchronous motor without load and with significant load on the shaft, without installation of longitudinal capacitive compensation and with longitudinal compensation are investigated. Starting modes of asynchronous motor in soft and rigid network are analyzed, improvement of starting conditions with considerable loading on a shaft of a powerful remote asynchronous motor in the scheme with the installation of longitudinal capacitive compensation (reduction of acceleration time, increase of voltage on the motor terminals, disappearance of negative values of moment) is shown. Conditions of occurrence of electromagnetic instability of start mode, permissible parameters of longitudinal compensation and shunt resistance are defined, at which occurrence of instability is excluded, the boundary of stable operation of investigated motor in start mode is set.