Quality of CMM: Unterschied zwischen den Versionen
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| Zeile 18: | Zeile 18: | ||
|25 % - 65 % | |25 % - 65 % | ||
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| − | | | + | |Surface Borehole |
| − | | | + | |during and after mining |
| − | | | + | |25 % - 95% |
|- | |- | ||
| − | | | + | |Surface ventilation Borehole |
| − | | | + | |during mining |
| − | | | + | |< 4% |
|- | |- | ||
|rowspan=2 |Abandoned Mine | |rowspan=2 |Abandoned Mine | ||
Version vom 20. Februar 2012, 16:19 Uhr
Definition and Origin
"Coalbed methane (CBM) is methane contained in coal seams, and is often referred to as virgin coalbed methane, or coal seam gas." (EPA Climate Change Glossary of climate change terms) It refers to the methane gas found in coal deposits.
Coal Mine Methane (CMM) is the subset of CBM that is released from the coal seams during the process of coal mining. The CMM described and discussed in this Wiki is an anthropogenic emission.
CMM Ressources
| Spaltenbreite 150 Pixel | Spaltenbreite 400 Pixel | Spaltenbreite 100 Pixel | Spaltenbreite 100 Pixel |
|---|---|---|---|
| Active Mine | Underground extracting System | during mining | 25 % - 65 % |
| Surface Borehole | during and after mining | 25 % - 95% | |
| Surface ventilation Borehole | during mining | < 4% | |
| Abandoned Mine | Zelle B4 | Zelle B4 | Zelle B4 |
| Zelle B5 | Zelle B5 | Zelle B5 | |
| Pre Mining | Zelle B6 | Zelle B6 | Zelle B6 |
|
|――――― Ventilation ―――――Ventilation shaft
| during mining 0,1 – 1,0 % CH4
|
|
|
|―――― Active Mines ――――――Ventilation shaft
| | during mining 0,1 – 1,0 % CH4
| |
| |―――――Underground gas extracting system
| | during mining 25 % to 65 % CH4
| |
| |―――――Surface boreholes
| | Pre & during & post mining 25 % to 95 % CH4
| |
| |―――――surface boreholes
| during mining < 4 % CH4
|
|
|
|―――― Abandoned Mines ―――old shaft (Ventilation) shaft 25 %– 85 % CH4
|
|―――Surface boreholes into mining gallery 25 %– 85 % CH4
|
"Coalbed methane (CBM) is methane contained in coal seams, and is often referred to as virgin coalbed methane, or coal seam gas." (EPA Climate Change Glossary of climate change terms) It refers to the methane gas found in coal deposits.
Coal Mine Methane (CMM) is the subset of CBM that is released from the coal seams during the process of coal mining. The CMM described and discussed in this Wiki is an anthropogenic emission. |
