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Nowak J.,KGHM CUPRUM Ltd
12th International Multidisciplinary Scientific GeoConference and EXPO - Modern Management of Mine Producing, Geology and Environmental Protection, SGEM 2012 | Year: 2012

The concept of installation for lignite gasification using borehole method and the possibility of using synthesized gas in the power and heat plant with the power of 50 MW are described in the paper. The economic assessment of the project is presented as well. The power plant combusting low quality blast-furnace gas as a fuel was used in that project. The use of synthesized gas and the investment in the installation of underground lignite gasification turned to be economically attractive project. Cost of producing 1 kWh of power energy was estimated and the parameters obtained from economic assessment are presented as well in the paper. © SGEM2012 All Rights Reserved by the International Multidisciplinary Scientific GeoConference SGEM Published by STEF92 Technology Ltd. Source


Chlebus T.,Wroclaw University of Technology | Stefaniak P.,KGHM CUPRUM Ltd
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2012

The Article presents the concept of intelligent transportation system, which could be implemented in copper mines. The task of such a system is intelligent and safe management of the horizontal transport by means of band conveyors. The solutions described here are aimed at showing how the transport could be automated, the problems signalled and the modern band conveyor systems utilised optimally. © 2012 Springer-Verlag. Source


Obuchowski J.,KGHM CUPRUM Ltd | Zimroz R.,Wroclaw University of Technology | Wylomanska A.,Wroclaw University of Technology
Measurement: Journal of the International Measurement Confederation | Year: 2016

In this paper a method for vibration signal enhancement is presented. It incorporates an idea that the signal acquired on the machine housing is a convolution of an informative signal (cyclic pulse train) with an impulse response of the system. The impulse response corresponds to a transmission path through which the informative signal propagates. The informative signal is a signal that contains information about a local damage. The classical method that estimates the impulse response of the system is called minimum entropy deconvolution (MED) and it aims to maximize kurtosis of the deconvolved signal, i.e. kurtosis of the informative signal estimate. Recently, skewness-based deconvolution (equalization) has been proposed as an alternative method for damage detection in rotating machines. In this paper we incorporate an alternative criterion which combines advantages of both of the previously used deconvolution criteria. Kurtosis is a widely-used tool for impulsiveness detection even if they are hidden in the signal, although favouring single-spike signals is a disadvantage of kurtosis. On the other hand, skewness is more robust, since it incorporates statistical moment one order lower than kurtosis. However, signals related to local damage are not always asymmetric, thus skewness is not a suitable criterion for their extraction. Thus, it is worth to combine both kurtosis and skewness in a single deconvolution criterion. We compare properties of two previously used criteria (kurtosis and skewness) with the novel one which is based on the Jarque-Bera statistic using a simulation study. An experimental validation on a real vibration signal (two-stage gearbox from an open-pit mine) is performed as well. © 2016 Elsevier Ltd. All rights reserved. Source


Nowak J.,KGHM CUPRUM Ltd
Geomechanical Processes During Underground Mining - Proceedings of the School of Underground Mining | Year: 2012

Concept of developing underground brown coal gasification plant for supplying synthesized gas to heat and power plant operating as a cogeneration unit is described in this paper. Calculations of energy balance connected with the demand for gas fuel are shown. Dimensions and number of underground reactors are given as well. Basic assumptions for energy plant are discussed. Some elements of project economic assessment are also presented. © 2012 Taylor & Francis Group, London. Source


Kudelko J.,KGHM CUPRUM Ltd
Geomechanical Processes During Underground Mining - Proceedings of the School of Underground Mining | Year: 2012

The demand and supply of raw materials have an influence on mining companies activity. The investment needs a new look on the mining projects market and requires an adequate strategy. The paper is focused on development strategies and their evaluation. A special attention was paid to the economic aspects and its measures. Cost effectiveness and risk of consolidation projects can be described as a comparison of a real net value of integrated and basic companies. © 2012 Taylor & Francis Group, London. Source

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