Górnictwo i Geoinżynieria
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ISSN 1732-6702
Issue Date
2009
Volume
R. 33
Number
Nr 2
Description
Journal Volume
Górnictwo i Geoinżynieria
R. 33 (2009)
Projects
Pages
Articles
Obciążenia ekstremalne w procesie projektowania i eksploatacji koparek kołowych przeznaczonych do pracy w gruntach trudno urabialnych kopalń odkrywkowych węgla brunatnego
(Wydawnictwa AGH, 2009) Alenowicz, Jerzy; Onichimiuk, Marek; Wygoda, Marian
Problems connected with extreme loadings modelling in the process of design and exploitation of bucket wheel excavators intended for operation in the hard diggable soils, have been presented in the article. Existing deterministic model of bucket wheel loadings has been described. New statistical approach to digging forces modelling of hard diggable soils with bucket wheel excavators has been presented on the basis of actual research on parameters of this process. Extreme values of statistical asymptotic distributions of steel structure stress and unit digging resistances are the basis for modelling. The model of component tangent digging force operating directly on the edge bucket of bucket wheel excavators was proposed. The further procedure connected with verification of proposed statistical model was discussed. The advantages resulting from use of the above model in design and exploitation of opencast mining bucket wheel excavators were given.
Badania elektromechanicznych zespołów napędowych zwałowarki ZGOT
(Wydawnictwa AGH, 2009) Anuszczyk, Jan; Jabłoński, Mariusz
Paper presents the results of laboratory and industrial testing of the caterpillar drives of the loading feeder of the spreader ZGOT-15400.120 working in the strip pit Szczerców of the KWB »Bełchatów« Mine. The electromagnetic and electromechanical transient states in the drive systems have been analysed. A new conception of sensorless steering algorithm modification in the CUVC bord controlling of converter has been introdused. After proposed solution the decrease of motors torque oscilations and mechanical vibrations in the low frequencies range of converter work was obtained.
Wykorzystanie satelitarnej technologii GPS w monitorowaniu stanu powierzchni terenu górniczego »Koźmin I«
(Wydawnictwa AGH, 2009) Błaszczyk, Sławomir
In order to check the range of the influence of mining works on »Koźmin I« mining ground, »Adamów« Coal Mine Plc in Turek took actions aiming at conducting scientific research using precise satellite measurements. The article includes some basic information concerning the calculation of reference and controlled point coordinates in order to describe absolute relocations. The works preceding the measurements have been discussed, that is the choice of the location of the points taking into consideration A-2 motorway in particular. The authors of the article have also described building and assembling signs in the ground which make up geodesic two-functional base on the mining ground in order to mark possible relocations. The report from conducting the initial satellite measurement has been presented here together with the conclusions. The Department of Geodesy and Navigation of Warmińsko-Mazurski University in Olsztyn is the scientific unit conducting the research.
Numeric dispersion calculations for evaluation measures and prediction of particulate matter emissions by surface mines
(Wydawnictwa AGH, 2009) Böhner, Rebeca; Niemann-Delius, Christian
In January 2005 a new European Legislation on Air Quality became effective. Since this time, strict limit values for particulate matter in the outside air apply to the member states of the European Union. Surface mines have come in the public focus, because particulate matter concentrations are substantial in their vicinity. The material mining industry operating open pits contributes to particulate matter concentrations on account of the spatial extent of its operations and the related processes. According to the EU law every particulate matter polluter is obliged to reduce its emissions and start measures to reduce dust if necessary. Therefore, action plans have been drawn up and implemented for example for the Hambach and the Garzweiler mine in the Rhenish Lignite District in Germany. The measure mostly comprise technical means, but the effect is not yet complete scientifically established. The development of adequate measures to avoid particulate matter emissions is a central task for companies as well as for public authorities An important part in this is the knowledge of the processes that entail particulate matter concentrations. The aim is to pinpoint particulate matter concentrations and detect the processes which are responsible. Next to selective measurements, numeric dispersion models constitute an important monitoring and forecast procedure. The results enable delivering a clear picture of the emissions and their dispersion, to guide planning and to achieve the standards of the current and future air European quality regulations.
Koncepcja układu produkcji metanolu zintegrowanego ze zgazowaniem węgla brunatnego
(Wydawnictwa AGH, 2009) Chmielniak, Tomasz; Popowicz, Józef; Sarnecki, Włodzimierz
The performance of methanol production plant based on lignite gasification using commercially available technology was simulated. For lignite gasification the entrained flow, dry feeding gasifier was selected. Pre-feasibility study of the plant processing 2 million ton of raw coal (50% water content) was presented and discussed. For considerad plant configurations, results of analysis confirm economical feasibility of the technology.