Temat: methane hazard - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Analysis of the application of methane-bearing capacity test methods in the conditions of Polish mining
Autorzy:: Karbownik, Marcin
Powiązania:: https://bibliotekanauki.pl/articles/2201419.pdf
Data publikacji:: 2022
Wydawca:: Główny Instytut Górnictwa
Tematy:: hard coal
methane hazard
methane-bearing capacity
mining
węgiel kamienny
zagrożenie metanowe
metanowość
górnictwo
Opis:: The methane hazard is one of the natural hazards occurring in hard coal mining. The content of natural methane in hard coal seams, the so-called methane-bearing capacity, is one of the key parameters that allow for proper assessment of the methane hazard and the state of the threat of gas and rock outbursts. For safety purposes, there is a constant need to improve the methods for the determination of this parameter. In the conditions of Polish mining, the method used for methane-bearing capacity determination is the direct drill cuttings method. This paper contains a comparative study presenting three different methods of methane-bearing capacity determination. Tests were conducted using two direct methods (the drill cuttings method and the United States Bureau of Mines (USBM) method), and the indirect method based on the desorption intensity index. On the basis of the obtained test results, it was found that the results obtained with the USBM method were slightly higher than those obtained with the direct drill cuttings method. Gas losses, an important element affecting the final value of the assay, were also analysed. This comparative study will evaluate the validity and applicability of the above methods under specific conditions in hard coal mining.
Źródło:: Journal of Sustainable Mining; 2022, 21, 4; 309--318
2300-1364
2300-3960
Pojawia się w:: Journal of Sustainable Mining
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: 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.
Powiązania:: https://bibliotekanauki.pl/articles/91923.pdf
Data publikacji:: 2014
Wydawca:: Główny Instytut Górnictwa
Tematy:: safety
mining
ventilation
methane hazard
analysis
assessment
bezpieczeństwo
górnictwo
wentylacja
zagrożenie metanowe
analiza
ocena
Opis:: 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.
Źródło:: Journal of Sustainable Mining; 2014, 13, 4; 40-46
2300-1364
2300-3960
Pojawia się w:: Journal of Sustainable Mining
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Methane risk assessment in underground mines by means of a survey by the panel of experts (SOPE)
Autorzy:: Krause, E
Krzemień, K.
Powiązania:: https://bibliotekanauki.pl/articles/92155.pdf
Data publikacji:: 2014
Wydawca:: Główny Instytut Górnictwa
Tematy:: methane hazard
risk assessment
underground mine
expert
zagrożenie metanowe
ocena ryzyka
kopalnia podziemna
ekspert
Opis:: Purpose: The purpose of the paper was to develop a method of methane risk assessment in order to fulfil the technical-organizational and legal requirements for occupational risk assessment in mines. Methane hazard and associated risks of the effects of ignition and/or explosion of methane is one of the most severe natural hazards. Methods: Heuristic methodology based on the Delphi approach and a group survey by a panel of experts, which was named SOPE, was used to assess the magnitude of methane risk. The adopted tools for assessing the current state of methane risk factors and their possible accident consequences were targeted surveys, with the participation of experts representing, mainly, engineering-technical personnel of mine ventilation service. The objectivity and independence of the judgment of the ex-perts was checked by determining indicators of the degree of the experts’ unanimity, indicators of their competence as well as indicators of the validity of their evaluations. The subject matter of the study of methane hazard were five longwall are-as of the "A-Z" twin-mine (after the merge of two mines: Mine A and Mine Z), three longwalls operated towards plant A and two longwalls operated towards plant Z. For the assessment of each area of the mine, a Methane Risk Assessment Questionnaire consisting of 4 assessment cards, was used. The cards included four areas of the studied risk factors, i.e. factors shaping the methane hazard (17 factors), the activity of the methane ignition initiators (19 factors), detection and prevention of methane risk (16 factors) and possible human and material losses (13 factors). Results: The evaluation of 65 factors affecting the causes and consequences of the methane risk in the exploitation area under ana-lysis, was conducted in accordance with the procedure of the adopted method, based on the proposed algorithm. Assess-ments by experts were used to calculate the indicators of the magnitude of methane hazard for each group of factors sepa-rately. Practical implications: A practical example of the application of this method is incorporated in chapter four of this paper, which also discusses the results of the conducted research. Originality/ value: The obtained values of the indicators of methane risk assessment and analysis of their changes showed that the proposed method can be an important element in the design and construction of a modern methane safety system in coal mines. It provides the possibility of controlling this risk and enables the minimization of its consequences in accordance with the criteria of their acceptance, adopted in this paper. The method does not replace the currently used methods of methane risk assessment, but complements them in a significant and modern way.
Źródło:: Journal of Sustainable Mining; 2014, 13, 2; 6-13
2300-1364
2300-3960
Pojawia się w:: Journal of Sustainable Mining
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Tests of methane desorption and emission from samples of hard coal in the context of mine closures through flooding
Autorzy:: Krause, Eugeniusz
Karbownik, Marcin
Powiązania:: https://bibliotekanauki.pl/articles/1839015.pdf
Data publikacji:: 2019
Wydawca:: Główny Instytut Górnictwa
Tematy:: methane hazard
closing mines
flooding mines
methane emission
safety
underground mining
zagrożenie metanowe
zamykanie kopalni
zalewanie kopalni
emisja metanu
bezpieczeństwo
górnictwo podziemne
Opis:: Forecasts of methane emissions during and after flooding a closed gassy hard coal mine and the evaluation of possible methane migration to the surface in post-mining areas, after cutting off the vertical ventilation workings of hard coal mines from the surface, provide valuable information which can help to ensure public safety. This article presents research into the influence of changes in the hydrostatic pressure of a water column in a flooded mine on the volume of methane emission and migration from hard coal seams, during and after the flooding of a closed mine. The tests were conducted based on a modified research method developed by the French National Institute for Industrial Environment and Risks (INERIS), France, and the Central Mining Institute (GIG), Katowice, Poland. A test stand for gas desorption and autoclaves for emissions, under controlled pressure and temperature, were used. The tests were conducted and changes in pressure in the autoclaves over time were observed. The observations led to the conclusion that water inhibits methane desorption and emission from coal to varying extents, depending on the hydrostatic pressure exerted. Based on the conducted tests, developed a model of methane emission into flooded goafs was developed. A method of determining index k2 was also developed, which lowers the forecast volume of methane emission into goafs depending on the value of the hydrostatic pressure of the water column and the level of submersion. Results of the tests form the basis to calculate forecasts in the developed model of methane emission into the goafs of a mine during its closure, which, as a consequence, enables the identification of the level of methane hazard and the selection of preventive measures aimed at combating methane hazard during and after the closure of a gassy mine.
Źródło:: Journal of Sustainable Mining; 2019, 18, 3; 127-133
2300-1364
2300-3960
Pojawia się w:: Journal of Sustainable Mining
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Forecast of methane emission from closed underground coal mines exploited by longwall mining - a case study of Anna coal mine
Autorzy:: Duda, A.
Krzemień, A.
Powiązania:: https://bibliotekanauki.pl/articles/91954.pdf
Data publikacji:: 2018
Wydawca:: Główny Instytut Górnictwa
Tematy:: gas hazard
coal mine methane
greenhouse gas
coal mine closure
methane emission forecast
underground coal mine
zagrożenie gazowe
metan kopalniany
gaz cieplarniany
zamknięcie kopalni
prognoza emisji metanu
podziemna kopalnia węgla
Opis:: Closure and post-closure periods in underground coal mines present specific risks that have to be handled with sound management practices in order to achieve sustainability within the mining sector. These risks may negatively affect the environment and result in hazards on the surface caused by phenomena occurring in the rock mass after mining operations. One of the hazards that has to be considered in the process of coal mine closure is gas, which is caused by methane emission after mining operations cease. This paper presents a forecast of methane emissions conducted within the framework of the Research Fund for Coal and Steel “MERIDA” project, using a model that was developed by the National Institute for the Environment and Industrial Hazards (INERIS) from France, and the Central Mining Institute (GIG) in Katowice, from Poland. This model enables the estimation of the volume of methane emitted into longwall goafs from relaxed undermined and overmined coal seams in order to assess in a further step the risk of methane emissions into the atmosphere from closed/sealed underground coal mines. For a critical analysis of the forecasted methane emissions into the longwall goafs, the results obtained with this model were compared with a gas decline curve generated for longwall goafs from closed/sealed underground coal mines in Australia, where long term full range data was available. The results of the analysis allowed the forecasted emissions and, thus, the accuracy of the model to be validated. The forecast was developed in the “Anna” coal mine, property of the PGG Company, which is located in the southern part of the Upper Silesian region in the south of Poland, near the border with the Czech Republic, and that is undergoing a closure process.
Źródło:: Journal of Sustainable Mining; 2018, 17, 4; 184-194
2300-1364
2300-3960
Pojawia się w:: Journal of Sustainable Mining
Dostawca treści:: Biblioteka Nauki

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