The balance of methane and ventilation as a tool for methane hazard assessment in the areas of longwalls exploited in hard coal mines

• Autorzy: Koptoń H. , Wierzbiński K.

Identyfikatory

DOI

10.7424/jsm140408

• Języki publikacji: EN

Abstrakty

EN

Purpose This article presents an algorithm for the current assessment of methane hazards during the exploitation of longwalls in conditions where there are methane hazards. The algorithm has been developed within the framework of the international AVENTO project (Advanced Tools For Ventilation and Methane Emissions Control), carried out in Poland, inter alia, by the Central Mining Institute in cooperation with Kompania Węglowa SA (KW SA). The algorithm was developed based on the analysis of the ventilation-methane balances for longwall areas, based on the data registered by automatic methane sensors and the velocity of ventilating air. Methods Multiple research methods were used, such as: observation, a questionnaire and statistical methods. The questionnaire was used for the preliminary determination of methane hazards in the longwalls belonging to the industrial partner (KW SA). The polls were used to obtain relevant information about the hazards and means of prevention taken, such as: the methane content in the seam, the emissions of methane into the exploitation workings, the volume of methane drainage, the ventilation system used, and the amount of ventilation air used to combat the methane hazard. Based on the poll’s data, the longwalls with methane emissions in their environment were selected for testing, based on longterm observations of changes in the concentrations of methane in the ventilation air and in the methane drainage net. Methane concentration measurements were based on the values recorded by the methane sensors located in the workings which were considered to be most dangerous. For data processing a statistical method was used. In the research, the average results of the indicated concentrations of methane from the methane sensors were used for the correlation between the average values of methane emission in the region of the longwall or methane drainage, with other parameters, such as absolute pressure changes on the surface, technological processes or cycles in the longwall. For the evaluation of the methane hazard, an indicator was proposed, these being the ratio of the ventilation methane bearing capacity to the criterial methane bearing capacity. An increase of this indicator indicates an increase in the level of methane hazard. Results On the basis of the average daily value of the methane hazard status indicator, an algorithm for the assessment and visualization of methane hazard in the areas of the active longwalls was developed. The algorithm contains a list of technical and organizational actions which should be taken in the event of unfavourable risk assessment of methane hazard, reflecting very high risk or unsafe conditions for conducting further work. Practical implications The proposed algorithm can be used for the ongoing assessment of methane hazard in areas of exploited longwalls in order to support staff in surface control rooms and in ventilation departments. Originality/ value The current assessment of methane hazard in the areas of longwalls which are under methane conditions by means of the developed algorithm will improve the safety of exploitation.

Słowa kluczowe

EN

safety; mining; ventilation; methane hazard; analysis; assessment

PL

bezpieczeństwo; górnictwo; wentylacja; zagrożenie metanowe; analiza; ocena

• Wydawca: Elsevier ; Główny Instytut Górnictwa
• Czasopismo: Journal of Sustainable Mining
• Rocznik: 2014
• Tom: Vol. 13, iss. 4
• Strony: 40--46
• Opis fizyczny: Bibliogr. 9 poz.

Twórcy

autor

Koptoń H.

• Experimental Mine "Barbara", Department of Gas Hazard Control, the Central Mining Institute (Katowice, Poland), tel. [phone]

autor

Wierzbiński K.

• Experimental Mine "Barbara", Department of Gas Hazard Control, the Central Mining Institute (Katowice, Poland)

Bibliografia

• 1. Kozłowski, B. (1972). Prognozowanie zagrożenia metanowego w kopalniach węgla kamiennego [Prediction of methane hazard in the hard coal mines]. Katowice: Wydawnictwo "Śląsk".
• 2. Krause, E. (2003). Ocena poziomu zagrożenia metanowego w środowisku projektowanych i eksploatowanych ścian w pokładach metanowych [Assessment of the methane hazard level in the environment of designed and mined longwalls in gassy seams]. Wiadomości Górnicze, 54(7–8), 366–372.
• 3. Krause, E., Łukowicz, K. (2000). Dynamiczna prognoza metanowości bezwzględnej ścian (poradnik techniczny) [Dynamic prediction of absolute methane bearing capacity of the longwalls (technical guide)]. Instrukcja Głównego Instytutu Górnictwa, (14), 1–36.
• 4. Krause, E., Łukowicz, K. (2004). Zasady prowadzenia ścian w warunkach zagrożenia metanowego [Principles of longwall conducting in methane hazard conditions]. Instrukcja Głównego Instytutu Górnictwa, (17), 1–40.
• 5. Noack, K. (1980). Grubengasabsaugung aus dem Liegenden von Abbaubetrieben [Methane drainage in conducting of mining operations]. Zetschrift für Technik und Wirtschaft des Bergbaus, 116(14), 705–712.
• 6. Noack, K., Hubig, P. (1976). Die Methanausgasung im bundesdeutschen Steinkohlenbergbau 1975 [Methane in the West German coal industry in 1975]. Glückauf. Zetschrift für Technik und Wirtschaft des Bergbaus, 112(24), 1374–1380.
• 7. Regulation. (2002). Rozporządzenie Ministra Gospodarki z dnia 28 czerwca 2002 r. w sprawie bezpieczeństwa i higieny pracy, prowadzenia ruchu oraz specjalistycznego zabezpieczenia przeciwpożarowego w podziemnych zakładach górniczych [Order of the Minister of Economy on safety and labour hygiene, operation conducting and specialist refighting protection in underground mines]. Dziennik Ustaw, (139), poz. 1169.
• 8. Wierzbiński, K. (2013). Załącznik nr 4 do sprawozdania merytorycznego z realizacji projektu badawczego N N524 3381 40. pt. Identyfikacja niebezpiecznych stref metanu w rejonach ścian przewietrzanych w układzie na U po caliźnie węglowej [Appendix 4 to the substantive report on research project N N524 3381 40 ent. Identification of the hazardous methane zones in the areas of longwalls ventilated in U along the body of coal]. Katowice: Główny Instytut Górnictwa.
• 9. Winter, K. (1958). Gasabsaugung [Methane drainage]. Bergbau, special reprint, (9), 16.