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| Titel |
Carbon dioxide sorption capacities of gasified coal seams and their surrounding rocks |
| VerfasserIn |
T. Kempka, R. Aeckersberg, D. Li, E. Kunz, B. Krooss, N. Golz, R. Schlüter, T. Fernández-Steeger |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250027784
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| Zusammenfassung |
| Underground coal gasification (UCG) is considered a viable approach for the development of
deep and structurally complex coal deposits that are not economically extractable by
conventional mining techniques. The combination of UCG and the subsequent combustion of
the resulting synthesis gas in a combined cycle plant with the storage of carbon dioxide
formed during this process could provide a relevant contribution to the so called clean coal
technologies. Carbon dioxide captured from the flue gas of the combined cycle plant
would be injected into already gasified coal seams using the existing UCG borehole
infrastructure.
Within the present study different coal seams and their surrounding rocks were sampled
in all German hard coal mining districts. The coal samples were treated in a laboratory
gasification device to produce combustion residues comparable to those formed in
the UCG process. High-pressure carbon dioxide sorption experiments were then
conducted on the original coal samples, their gasified residues and the surrounding
rocks.
The results indicate a significant increase of porosity and carbon dioxide sorption
capacity of the residual coal after gasification. Furthermore, notable carbon dioxide sorption
capacities were observed for the surrounding rocks. The assessment of the carbon
dioxide storage potential in gasified coal seams has to take explicitly into account the
newly generated pore space, the increased sorption capacity of the gasified coals
and the sorption capacity of the surrounding rocks. Furthermore, the reduction
of subsurface void volumes due to mechanical compaction after gasification as
well as the resulting enhanced accessibility of adjacent seams have to be equally
considered. |
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