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Abstract

The presented paper describes the results of an experiment determining the instantaneous values of velocity vector components of the air stream at selected spots of the boundary layer formed at the sidewalls of the mine heading in the ŁP type steel arch support. The experiment was carried out in a mine heading in an active hard coal mine. A 3-axis thermoanemometric probe was used to obtain three-dimensional distributions of the velocity and turbulent values, such as turbulence intensity and turbulent kinetic energy of the flowing ventilation air stream. The analysis of the measurement results was aided by a numerical solution of the discussed case of flow. The research results presented in this paper provide a basis for extensive studies of the description of velocity distribution and other turbulent quantities within the near-sidewall structures of a mine heading. The objective of these tasks is to improve the accuracy and reliability of numerical calculations relating to air flow in mine headings.
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Authors and Affiliations

Przemysław Skotniczy
Piotr Ostrogórski
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Abstract

One of the most hazardous places in mines are longwall areas. They emit a considerable amount of methane to the ventilation air. The emission depends on many but mostly known factors. The article presents the research results on changes in the methane concentration along the longwall excavations and longwall. The distributions were obtained based on a measurement experiment at the ZG Brzeszcze mine in Poland. The author’s research aimed to experimentally determine the concentration of methane as a function of the length of excavation for the longwall excavations and longwall. As a result, methane concentration trends along the excavations were obtained. The conclusions show the pros and cons of the method used, and it allows to set the right direction in the development of measurement systems and sensors.
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Bibliography

[1] S .R. Deokar, J.S. Wakode, Coal Mine Safety Monitoring and Alerting System. International Research Journal of Engineering and Technology 4, 3, 2146-2149 (2017).
[2] D .A. Jakkan, P. Bhagat, Coal Mine Monitoring System Based on Wireless Technology and ARM . International Journal of Engineering Research 2, 6 (2013).
[3] M . Li, Y. Liu, Underground Coal Mine Monitoring with Wireless Sensor Networks. ACM Trans. Sen. Netw. 5, 1-29 (2009). DOI : https://doi.org/10.1145/1498915.1498916
[4] L . Liao, G. Lou, M. Chen, An Integrated RFID and Sensor System for Emergency Handling in Underground Coal Mines Environments. In J. Zheng, S. Mao, S.F. Midkiff, H. Zhu, (Eds.); Ad Hoc Networks, Springer Berlin Heidelberg 28, 818-824 (2010). DOI : https://doi.org/10.1007/978-3-642-11723-7_56 [5] F . Ma, Sensor Networks-Based Monitoring and Fuzzy Information Fusion System for Underground Gas Disaster. In Proceedings of the 2012 9th International Conference on Fuzzy Systems and Knowledge Discovery, 596-600 (2012).
[6] M .A. Moridi, M. Sharifzadeh, Y. Kawamura, H.D. Jang, Development of Wireless Sensor Networks for Underground Communication and Monitoring Systems (the Cases of Underground Mine Environments). Tunneling and Underground Space Technology 73, 127-138 (2018). DOI : https://doi.org/10.1016/j.tust.2017.12.015
[7] A . Zagórecki, Application of Sensor Fusion and Data Mining for Prediction of Methane Concentration in Coal Mines. Mining – Informatics, Automation and Electrical Engineering 43, 4 (2015).
[8] H . Zhao, W. Yang, An Emergency Rescue Communication System and Environmental Monitoring Subsystem for Underground Coal Mine Based on Wireless Mesh Network. Int. J. Distrib. Sens. N. 14, (2018). DOI : https://doi.org/10.1177/1550147718805935
[9] Polish Legal Act, Dz.U. 2017 poz. 1118, Rozporządzenie Ministra Energii z Dnia 23 Listopada 2016 r.
[10] A . Tomczyk, K. Rutecki, Monitorowanie i Kontrola Zmian Ciśnienia Atmosferycznego Kopalni dla Potrzeb Bezpieczeństwa. Mechanizacja i Automatyzacja Górnictwa 47, 7, 99-107 (2009).
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[12] H . Badura, D. Araszczuk, Analiza Zagrożenia Metanowego w Ścianie G-6 w Pokładzie 412\lg+\ld i 412\lg w KWK „A” – Studium Przypadku. Przegląd Górniczy 73, 47-55 (2017).
[13] W . Dziurzyński; P. Skotniczny, J. Krawczyk, M. Gawor, T. Pałka, P. Ostrogórski, J. Kruczkowski, J. Janus, Wytyczne Rozmieszczenia Anemometrów Stacjonarnych Wzdłuż Długości Wyrobiska Kopalni jak i w Samym Polu Przekroju Poprzecznego Wyrobiska. In: Zasady pomiarów przepływów powietrza w wyrobiskach kopalnianych. Wybrane sposoby kontroli i kalibracji przyrządów pomiarowych (2017).
[14] J. Kruczkowski, Rozkład Stężeń Metanu w Wyrobiskach Przyścianowych. In Zagrożenia aerologiczne w kopalniach węgla kamiennego – profilaktyka, zwalczanie, modelowanie, monitoring; Główny Instytut Górnictwa (2013).
[15] P. Skotniczny, Transient States in the Flow of the Air-Methane Mixture at the Longwall Outlet, Induced by a Sudden Methane Outflow. Arch. Min. Sci. 59, 4, 887-896 (2014). DOI : https://doi.org/10.2478/amsc-2014-0061
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[19] P. Skotniczny, P. Ostrogórski, Three-Dimensional Air Velocity Distributions in the Vicinity of a Mine Heading’s Sidewall. Arch. Min. Sci. 63, 2, 335-352 (2018). DOI : https://doi.org/10.24425/122451
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Authors and Affiliations

Piotr Ostrogórski
1
ORCID: ORCID
Przemysław Skotniczny
1
ORCID: ORCID
Mieczysław Pucka
2

  1. Strata Mechanics Institute, Polish Academy of Sciences, 27 Reymonta Str., 30-059 Kraków, Poland
  2. Tauron Wydobycie S.A. ZG Brzeszcze, ul. Kościuszki 1, 32-620 Brzeszcze, Poland
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Abstract

The article shows the results of research on methane concentration changes along mine galleries. The experiment was conducted in a longwall area mined using a U-type system, and the results were obtained in situ. The main goal was to measure methane concentration by function of gallery length and dividing segments of methane data into segments, which ultimately enabled separate analysis of these methane data. The analysis led to the diagnosis of methane hazard through the detection of exceedance of the assumed tolerance area.
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Authors and Affiliations

Piotr Ostrogórski
1
ORCID: ORCID
Przemysław Skotniczny
1
ORCID: ORCID

  1. Strata Mechanics Research Institute of the Polish Academy of Sciences, 27 Reymonta Str.,30-059 Kraków, Poland

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