Thermodynamic and kinetic processes associated with CO 2-sequestration and CO 2-enhanced coalbed methane production from unminable coal seams

The present thesis investigates the thermodynamic and kinetic processes associated with gas sorption (CO2, CH4) on coal. It is incorporated into a research field which studies CO2-sequestration in combination with CO2-enhanced coalbed methane production in unminable coal seams. This combination is regarded as a viable and promising option to reduce anthropogenic CO2-emissions. At the moment numerous world-wide research projects investigate the feasibility of this concept under different geological and technical conditions. Among these projects, the RECOPOL-project („Reduction of CO2 Emissions by means of CO2 Storage in the Silesian Basin in Poland”) is working on a European level and includes laboratory experiments, reservoir modeling, and geophysics as well as a field test in the Upper Silesian Basin in Poland. As a partner in this broad international consortium, it was the task to perform single- and mixed-gas sorption experiments on coals from the test site under the prevailing in situ reservoir conditions. Further coal samples from different coal basins all over the world have been integrated into this study to strengthen gained results and to address the diversity of coal samples in terms of rank, maceral composition, and moisture. Experiments have been performed on 14 different coal samples. Analytical temperatures were 22, 32 and 45°C at pressures up to 230 bar (23 MPa). The thesis is divided into three major chapters, each of them dealing with a different, well defined question: • The first part contains measurements that arose from a Round Robin initiated by the US Department of Energy. The different laboratories were supposed to investigate five different samples from the Argonne Premium Sample Programme. Measurements performed included CO2 single-gas isotherms on dry coals at 22°C and pressures up to about 50 bar (5 MPa). Additionally, CH4 experiments under the same experimental conditions as well as CO2/CH4 mixed-gas sorption experiments at 45°C and pressures up to 180 bar (18 MPa) have been carried out. • The second part investigates the kinetics of gas sorption on coal. To address this issue, CO2 and CH4 adsorption/diffusion experiments on one coal sample from the Upper Silesian Basin in Poland have been conducted on different grain sizes and temperatures (32 and 45°C) as well as on dry and moist coals. • The third part concentrates on the preferential sorption from CO2/CH4 gas-mixtures on coal. Measurements have been performed on ten different coal samples at 45°C and pressures up to 230 bar (23 MPa). Dry and moisture-equilibrated coals as well as different source gas compositions have been used.

Grantor dc:publisher

Publikationsserver der RWTH Aachen University

Year dc:date

2005

Author dc:creator

• Busch, Andreas

Contributors dc:contributor

• Littke, Ralf

• info:eu-repo/classification/ddc/550
• Kohlenflöz
• Gasgewinnung
• Kohle
• Gas
• Sorption
• Sorptionskinetik
• Kohlendioxid
• Methan
• Kohlendioxidemission
• Emissionsverringerung
• Geowissenschaften
• CO2-Speicherung
• Flözgas
• Thermodynamik
• Technische Kinetik
• Textilien
• Faserverstärkter Kunststoff
• Maschinennähen
• Dreidimensionale Bearbeitung
• Faserverbundbauteil
• Herstellung

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

eng

Identifier

https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-123757%22

OAI identifier oai:identifier

oai:publications.rwth-aachen.de:62167