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| Titel |
Development of geotechnical models for verification of in situ coal conversion impacts |
| VerfasserIn |
H. Tian, T. Kempka, R. Schlüter, M. Ziegler, R. Azzam |
| 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 |
250019199
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| Zusammenfassung |
| In situ coal conversion combined with geological carbon dioxide storage in converted coal
seams is currently discussed on an international level having led to different preparatory
studies and world-wide political activities. During the power generation process from
synthesis gas produced by in situ coal conversion, carbon dioxide can be removed prior or
subsequent to synthesis gas conversion in a combined cycle plant by application of
advanced carbon capture technologies. Exploited fields can serve as storage deposits for
carbon dioxide produced during the processes of in situ coal conversion and power
generation.
Currently, different experimental studies are being carried out at the laboratories of the
RWTH Aachen University and the DMT GmbH & Co. KG to investigate medium to low
volatile bituminous coals and anthracites from German mining areas considering their
applicability for in situ conversion and as subsequent carbon dioxide storage media. This
involves the analysis of mineralogical, petrological and geotechnical properties of coals and
surrounding rocks such as: CO2/N2 sorption experiments, permeability and porosity tests
considering the roof pressure development as well as geotechnical tests (uniaxial
compression tests, oedometer, shear tests, triaxial tests, etc.) with regard to in situ conversion
parameters.
These experimental results are used for parameterizing numerical geotechnical models
and other models. The geotechnical models are based on geological information (stratigraphy
and geologic structure from borehole data and seismic, engineering geological maps, GIS,
etc.). They will be influenced by the designed gasification processes simulating
geomechanic response to the combined process. Further studies using these models involve:
calculating and estimating ground subsidence resulting from in situ coal
conversion;
investigating and predicting geotechnical impacts resulting from CO2 storage
into converted coal seams;
validating the simulation results of the models; and
coupling geotechnical models with multiphase flow models to assess the
environmental risk of geological CO2 storage and to provide basic data support
for designing and adjusting the in situ conversion process considering impacts of
CO2 injection and migration on surrounding rocks.
The adapted geotechnical models will be applied for verification of in situ coal conversion
impacts on the development of ground subsidence in deep coal deposits as available in
Central and Western Europe. A further development of these models will allow a site specific
best-fit calculation of the conversion field dimensions aiming at maximum utilization and
minimum environmental impact by ground subsidence. |
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