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    Wyświetlanie 1-4 z 4
    Tytuł:
    Analysis of Methane Concentration Distribution at U-Ventilated Longwall Outlet – Case Study
    Autorzy:
    Niewiadomski, Adam
    Badura, Henryk
    Ivanova, Tanyana N.
    Repko, Alexandr
    Yury, Nikitin R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2064299.pdf
    Data publikacji:
    2020
    Wydawca:
    STE GROUP
    Tematy:
    longwall ventilation
    coal mine methane
    correlation
    autocorrelation
    korelacja
    autokorelacja
    zagrożenie metanowe w kopalniach
    wentylacja kopalni
    Opis:
    The methane hazard concerns a growing number of longwalls in the Polish coal mining industry each year. Mitigating this hazard, both of work safety and economic reasons requires the application of preventive measures adequate to its level. Commonly threat level is estimated based on registered methane concentrations, which fluctuate and highly depends on the place of measurement. The article presents studies on the average and maximum methane concentrations at the longwall outlet, including analyses of the interdependence of methane concentration in methanometry sensors installation locations.
    Źródło:
    New Trends in Production Engineering; 2020, 3, 1; 149 --168
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Stoppages in the Process of Roadway Drivage Caused by Exceeding the Maximum Allowable Level of Methane Concentration
    Autorzy:
    Brodny, Jarosław
    Tutak, Magdalena
    Felka, Dariusz
    Dorota, Palka
    Powiązania:
    https://bibliotekanauki.pl/articles/2064253.pdf
    Data publikacji:
    2020
    Wydawca:
    STE GROUP
    Tematy:
    methane hazard
    dog headings
    mining operations
    methaneometry
    process efficiency
    metaneometria
    wydajność procesu
    zagrożenie metanowe
    pomiar metanu
    Opis:
    Methane is one of the most dangerous gases occurring in mining production. Being inseparably connected with the rock mass, it presents a serious risk to occupational safety and reduces the effectiveness of mining production. A particularly high methane hazard occurs directly during exploitation in longwall headings and the drivage of roadways. Exceeding the maximum allowable level of its concentration in these headings makes it necessary to disconnect all machines until this concentration level is reduced. This leads to unscheduled downtimes of such machines, thus increasing the costs of their operation and decreasing their effectiveness. The paper demonstrates the results from the analysis of machine downtimes in the drivage of roadways, caused by excessive methane concentration levels. The analyses were based on the indications from the system for automatic monitoring of the ventilation parameters in this heading. The results obtained clearly demonstrated that exceeded values of methane concentration caused a series of unexpected downtimes in the drivage process. As a result, the process was disturbed and its effectiveness reduced. The presented analyses are one of the first to address the issue of how methane emissions affect machine downtimes. However, this phenomenon represents a major problem that needs to be addressed comprehensively in order to minimise the losses arising out of the necessary disruptions to the exploitation process.
    Źródło:
    New Trends in Production Engineering; 2020, 3, 1; 197--210
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the Accuracy of Methane Concentration Forecasts in the Area of Longwall Outlet B-3 in Seam 407/1 in KWK “Borynia-Zofiówka” Ruch Zofiówka
    Autorzy:
    Badura, Henryk
    Zmarzły, Marian
    Trzaskalik, Paweł
    Korshunov, Aleksandr Ivanovich
    Powiązania:
    https://bibliotekanauki.pl/articles/2064273.pdf
    Data publikacji:
    2020
    Wydawca:
    STE GROUP
    Tematy:
    longwalls
    methane hazard
    methane concentration forecast
    testing of forecast accuracy
    prognozy stężenia metanu
    dokładność prognoz
    zagrożenie metanowe
    Opis:
    In the presented publication, an ex post forecast of methane concentration at the airway outlet was carried out on the basis of equations previously developed and repeatedly tested by H. Badura and its errors were calculated. This forecast was considered as a reference level. Next, using the same forecast equations, the forecasting of methane concentration at the sensor location up to 10 m in front of the longwall face and at the longwall outlet was carried out, followed by the analysis of forecast errors. Since the measurement of methane concentrations in the locations under consideration differed, the results of forecasts also differed. Therefore, in order to assess the accuracy of forecasts, their absolute and relative errors were calculated and then compared with the forecast errors at the airway outlet. The analysis of errors showed that there are differences in forecast accuracy and it is advisable to develop new forecast equations mainly for the longwall outlet, but also for the location of methane concentration sensor installed in the airway up to 10 m in front of the longwall.
    Źródło:
    New Trends in Production Engineering; 2020, 3, 1; 120--130
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Gas-Geodynamic Phenomena During the Preparatory and Mining Works in Seam 358/1 at KWK “Budryk”
    Autorzy:
    Zmarzły, Marian
    Schubert, Michał
    Salamon, Krystian
    Powiązania:
    https://bibliotekanauki.pl/articles/2064263.pdf
    Data publikacji:
    2020
    Wydawca:
    STE GROUP
    Tematy:
    outbursts of methane
    outbursts of coal
    methane hazard
    gas-dynamic phenomena
    transient states of air parameters
    mine monitoring systems
    zjawiska gazodynamiczne
    stany nieustalone parametrów powietrza
    zagrożenie metanowe
    wyrzuty metanu
    wyrzuty węgla
    monitoring kopalń
    Opis:
    The nature of gas-geodynamic phenomena is so complicated and unpredictable that it forces the necessity of continuous search for new principles of identifying the outburst threat and ongoing monitoring of this threat with view of current conditions in the mine. After the incidents in JSW S.A, the mines carrying out works in seams threatened with outbursts, upon their own initiative introduced additional rigours and increased the frequency of measurements and tests regardless of the existing legal requirements. Incidents that have taken place in KWK “Budryk” in recent years show how important is continuous verification of knowledge related to the forecasting of the outburst threat on the basis of ongoing observations of works. The local occurrence of a zone characterized by high methane-bearing capacity in the coal seam, even after taking preventive measures and introducing additional rigorous did not allow for the complete elimination of gas-geodynamic phenomena and avoidance of danger to employed people.
    Źródło:
    New Trends in Production Engineering; 2020, 3, 1; 131--148
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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