Górnictwo i Geoinżynieria
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ISSN 1732-6702
Issue Date
2006
Volume
R. 30
Number
Nr 3
Description
Journal Volume
Górnictwo i Geoinżynieria
R. 30 (2006)
Projects
Pages
Articles
Próba opisu zjawiska prądów wstecznych metodami CFD
(2006) Branny, Marian; Broda, Krzysztof; Filek, Krzysztof; Mikołajczyk, Władysław
An attempt to describe the reverse flow phenomena through numerical simulation was undertaken in this paper. The flow domain creates a 150 m long declined gallery with 15 degrees angle of inclination. The airflow is descending in isotropic conditions. In 10 m long gallery's section a hihger temperature of foor and roof than on remining rock surfaces was assumed. The cosidered problem is described by a system of equations of continuity, Navier-Stokes and energy together with k-epsylon turbulence model. The calculations were performed for different wall temperatures of heated gallery's section. The flow field patterns, characterizing the respective stages of reverse flow expasion are analyzed. CFD code validation based on the experimental data were performed. The numerical calculations by the programme FLUENT 6.1 have been supported.
Problemy zapewnienia stabilnych parametrów paliwa z odmetanowania kopalń stosowanego do silników gazowych
(2006) Nawrat, Stanisław; Kuczera, Zbigniew; Łuczak, Rafał; Życzkowski, Piotr
Gases from demethanation of hard coal beds are low-methane fuels, which can be used in different kinds of heating and power engineering systems, i.e. in boilers with gas burner, engines and gas turbines. Assurance of high stability of quantitative and qualitative parameters is serious problem, which makes difficulty with right exploitation of that installations. This article presents the requirements for gases from demethanation, which are used for feeding the heating-power engineering installation, and possibilities, which burn gases from demethanation from hard coal mine »Budryk«, the influence of non-stable parameters of fuel on installation work and technical solutions, which provide the stabilization of quantitative and qualitative parameters of gases from demethanation, are discussed.
Chłonność doszczelnianych zrobów zawałowych
(2006) Piotrowski, Zbigniew; Mazurkiewicz, Maciej
Fly ash suspensions are used in Polish underground coalmines for many years, mainly for filling of caved areas. Computation of required amount of waste is one of the most important problem. It depends on volume of voids between rocks within the cavings (inter-grain space) and other factors. The total amount of suspension which can be used is named »absorbability of cavings«. Results of model studies and technical tests realized for 38 longwalls applying caving method are presented in the paper.
Carbon dioxide concentration in mine workings
(2006) Ptaszyński, Bogusław
The article presents the phenomenon of the increase of $CO_2$ concentration value beyond admissible regulations in some underground workings in a certain ore mine. Research makes it clear that the cause of this repeated state is not a technical or organizational issue. Its grounds are rather physical. Selected results of extensive research conducted in the mine throughout 8 months are presented in the article, with the registration of the mentioned state of inadmissible $CO_2$ and $O_2$ concentration values in mine air. The paper also demonstrates the analysis of the correlation and multiple linear regression, as well as the outcome of its application to measurement results. Using the Statistica suite, the analytical form of the multiple linear regression was determined. The form of the obtained function could prove useful in forecasting the $CO_2$ concentration in mine air, all the more as the power of thus-determined linear correlation is very high.
Określenie kryterium optymalnych parametrów pracy dysz zraszających do strącania pyłów z powietrza kopalnianego
(2006) Szponder, Tadeusz
Application of atomizer water is the main method of dust fighting from coalmine's atmosphere. Dust extraction effectiveness depends on parameters of atomized stream microstructure and cloud of dust. Dust removal effectiveness by spraying is the function of many parameters which are integrated in a ratio of drops surface in volume unit of atomized stream.