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Banery wysuwane

Czerwona grafika na czarnym tle
Selected Issues Related to Methane Hazard in Hard Coal Mines

Kategoria produktu
Nauki techniczne » Górnictwo
ISBN
978-83-7464-726-7
Typ publikacji
monografia
Format
B5
Oprawa
twarda
Liczba stron
150
Rok wydania
2014
Wydanie
1
Opis

In the present monograph, various issues related to methane hazard in Polish hard coal mines are discussed. Chapter 1 contains a description of methane emission as a source of atmosphere pollution, while Chapter 5 presents the methods of methane capture and possible ways of its utilisation. In Chapters 2 and 4, the authors focus on a method for determining coalbed methane content and predicting it with the use of neural networks. Chapters 3 and 6 are devoted to presenting a new method of the classifi cation of methane hazard in hard coal mines and to describing adequate methods of monitoring and control. As an example, an evaluation of methane hazard in the area of longwall F-1 in seam 406/1, ventilated with a U system, is described in Chapter 7.
In Chapters 8, 9 and 10, methods of methane drainage implemented in the Polish mining industry are presented and the influence of mining and geological conditions on their efficiency is discussed. The effi ciency of particular drainage methods is discussed and compared, as well as methods of increasing it considering the low permeability of coal deposits in Poland.
The main reason for this monograph is to show how many technological problems need to be solve in order to conduct excavation in coal mines in condition of high methane hazard. The amount of methane emitted to the workings during mining is strictly defi ned by mining regulation, and it is of high importance for coal mines to forecast coalbed methane content before mining is started.

Spis treści

Introduction  9
1. Emissions of methane from hard coal mines as a source of atmosphere pollution  13
1.1. Introduction  13
1.2. Methods of reducing methane emissions into the atmosphere  15
1.3. Emissions of methane from Polish hard coal mines into the atmosphere  18
1.4. Methods of methane drainage from the strata implemented in Polish mines  19
1.5. Effi ciency of methane drainage from coal seams under development  23
1.6. Conclusions  24
2. Determination of methane content in coal seams along with measurement uncertainty specifi cation  25
2.1. Introduction  25
2.2. A method of determining coalbed methane content  26
2.3. Gas loss during collecting coal samples for measurement  27
2.4. The procedure of determining coalbed methane content  29
2.5. Evaluation of measurement uncertainty  31
2.6. Analysis of measurement uncertainty of coalbed methane content  32
2.7. Conclusions  37
3. Proposed revisions of the categorisation of methane hazard in underground mines  38
3.1. Introduction  38
3.2. Determining coalbed methane content  39
3.3. Evaluation of methane hazard in mines extracting hard coal  40
3.4. Proposed revisions of the categorisation of methane hazard  43
3.4.1. Methane hazard in underground mining plants extracting hard coal and lignite  43
3.4.2. Methane hazard in underground mining plants extracting nonferrous metal ore and salt  46
3.5. Conclusions  46
4. Predicting the release of methane into the longwall workings in Polish coal mines using neural networks  48
4.1. Introduction  48
4.2. Artifi cial neural networks  50
4.3. Description and analysis of data used to predict the evolution of methane release  51 
4.4. Determination of the neural network structure used to predict absolute methane-bearing capacity  54
4.5. Evaluation of the effectiveness of teaching neural network  57
4.6. Conclusions  59
5. Possibilities of capturing and utilising methane from hard coal mines  60
5.1. Introduction  60
5.2. Methane resources in hard coal deposits in Poland  60
5.3. The current system of supporting the utilisation of methane from hard coal mines  62
5.4. Utilising the captured methane  63
5.5. Conclusions  66
6. Monitoring and controlling methane hazard in excavations in hard coal mines  67
6.1. Introduction  67
6.2. Methane hazard control in other countries  68
6.2.1. The United States of America  68
6.2.2. Australia  69
6.2.3. Russia and Ukraine  71
6.3. Estimation of methane hazard resulting from binding legal regulations in Poland  72
6.3.1. Mining excavations with auxiliary ventilation  72
6.3.2. Longwalls with U and Y ventilation systems  76
6.3.3. Characteristics of Longwall B-11 in seam 348  76
6.4. System of continuous control over methane drainage system  84
6.5. Conclusions  86
7. Estimation of methane hazard in the area of U-ventilated longwall  87
7.1. Introduction  87
7.2. Development of guidelines for testing air parameters in order to assess methane hazard  88
7.3. Verifi cation of standards of sampling air from the goaf  91
7.4. Guidelines for the measurement and operational methanometric security of the longwalls mined in the presence of methane hazard  95
7.4.1. General principles for the control and prevention of methane hazard  95
7.4.2. Principles for the control of the amount of methane in air by using a mobile methanometer  96
7.4.3. Control of methane hazard by means of automated methane monitoring  97
7.4.4. Inspection and maintenance of the automated system of methane monitoring  99
7.4.5. Recording the measurements of the automated system of methane monitoring  100
7.5. Conclusions  100
8. Infl uence of mining and geological conditions on the effi ciency of coal mine methane drainage in Polish mines  102
8.1. Introduction  102
8.2. Methods for methane drainage in Polish coal mines  103
8.2.1. Methane drainage of longwalls with Y ventilation system  106
8.2.2. Methane drainage of longwalls from parallel tailgate roadways  107
8.2.3. Methane drainage of longwalls from cut off parallel tailgate road  107
8.2.4. Methane drainage of longwalls with an overlying drainage gallery  107
8.2.5. Methane drainage of longwall working to the rise  109
8.2.6. Other methods of methane drainage  109
8.3. Effi ciency of methane drainage conducted during mining by means of different methods  110
8.4. Conclusions  114
9. Possibilities of increasing the effi ciency of mine methane drainage in the conditions of low permeability of coal seams  116
9.1. Introduction  116
9.2. Gas fl ow in rock-mass  117
9.3. Pre-mining methane drainage  119
9.4. Methane drainage with increased permeability 120
9.5. Results of calculations of methane fl ow into methane drainage boreholes  121
9.6. Methane drainage effi ciency before mining  123
9.6.1. Methane drainage of a panel in Longwall B-1 in seam 406/1 125
9.6.2. Methane drainage of a panel in Longwall F-1 in seam 406/1 125
9.6.3. Pre-mining methane drainage of a panel in longwall G-4, seam 412łg+łd and 412łg  127
9.6.4. Methane drainage of a panel in longwall G-4, seam 412łg+łd and 412łg  128
9.7. Conclusions  128
10. Effi ciency of methane removal using different drainage systems in Polish hard coal mines  130
10.1. Introduction  130
10.2. Methane drainage systems in Polish coal mines  130
10.2.1. Methane drainage of a panel in Longwall G-6, seam 410  130
10.2.2. Methane drainage of a panel in Longwall Cw-2, seam 364/2  132
10.2.3. Methane drainage of a panel in Longwall B-13, seam 348  134
10.3. Methane drainage from overlying drainage gallery  136
10.3.1. Methane drainage of a panel in longwall XIII, seam 405/1  136
10.4. Methane drainage effi ciency in the developed coal seams  138
10.5. Conclusions  138
References  143

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