Inhalt
Adsorption
The investigation of gas adsorption on dry and moist coals at elevated pressures provides key parameters for:
· analysis of gas storage in and gas release from coal seams in sedimentary basins on the geologic time scale
· coalbed methane (CBM) exploration and production
· enhanced coalbed methane (ECBM) production by utilization of N2 and CO2
· storage of CO2 in unminable coal seams
Experimental work on high-pressure gas adsorption on coals has been performed in various projects and in co-operation with the Dutch Geological Survey (TNO). Presently our institute is conducting adsorption measurements in the context of the EU project RECOPOL, an international demonstration project to investigate the possibility of permanent subsurface storage of CO2 in coal. High-pressure gas adsorption measurements on coals are performed as single-component measurements with individual gases (methane, carbon dioxide) and with gas mixtures at pressures up to 25 MPa using a volumetric method.
Figure 1 shows a simplified flow-scheme of the experimental set-up consisting of a stainless-steel sample cell, a set of actuator-driven valves and a high-precision pressure transducer (max. pressure 25 MPa, with a precision of 0.05% of the full scale value). Examples for high-pressure adsorption isotherms for methane on dry and moisture-equilbrated coal from the Netherlands are shown in Figure 2.
Figure 1: Flow scheme of the experimental set-up for high-pressure gas adsorption on coals (A) and definitions for the volumetric method for gas sorption measurements (B)
Figure 2: Sorption isotherms for methane on dry and moisture-equilibrated Joppe-1 IV coal (Rr=1.19%) at 40, 60 and 80°C.
Laboratory equipment for adsorption experiments.
Krooss B. M., Gensterblum Y., Siemons, N., van Bergen, F., Pagnier, H.J.M, David, P. (2001). High-pressure methane and carbon dioxide adsorption on dry and moisture-equilibrated Carboniferous coals. Proceedings, International Coalbed Methane Symposium 2001, Tuscaloosa, Alabama, p. 177 - 191.
Krooss, B.M., Busch, A. and Gensterblum, Y., (2002). High-pressure adsorption of methane, carbon dioxide and their mixtures on coals; Proceedings of an International Workshop on ECBM: Present status and perspective of CO2 sequestration in coal seams, Tokyo, Japan, September 5.
Krooss, B.M., van Bergen, F., Gensterblum, Y., Siemons, N., Pagnier H.J.M. and David, P., (2002). High-pressure methane and carbon dioxide adsorption on dry and moisture-equilibrated Pennsylvanian coals. International Journal of Coal Geology, V. 51, p. 69– 92.
Busch, A., Gensterblum, Y., Krooss, B.M. (2003). Investigation of preferential sorption behaviourof CO2 and CH4 on coals by high pressure adsorption/desorption experiments with gas mixtures. International CBM Symposium Tuscaloosa, Alabama, May 5-9.
Busch, A., Gensterblum, Y., Krooss B.M. (2003). "Methane and CO2 sorption and desorption measurements on dry Argonne Premium Coals: Pure components and mixtures." International Journal of Coal Geology 55: 205-224.
Busch, A., Krooss, B. M., Gensterblum, Y., van Bergen, F. Pagnier, H.J.M., (2003). High-pressure adsorption of methane, carbon dioxide and their mixtures on coals with a special focus on the preferential sorption behaviour. J. Geochemical Exploration, 4071, 1-4.
Busch, A., Gensterblum, Y., Siemons, N., Krooss, B.M., van Bergen, F., Pagnier, H.J.M. and David, P. (2003). Investigation of preferential sorption behaviour of CO2 and CH4 on coals by high-pressure adsorption/desorption experiments with gas mixtures. Proceedings of the 2003 Coalbed Methane Symposium, Tuscalosa.
Busch, A., B. M. Krooss, et al. (2003). "High-pressure adsorption of methane, carbon dioxide and their mixtures on coals with a special focus on the preferential sorption behaviour." Presented at Geofluids IV, May 12-16, Utrecht., J. Geochem. Expl. 78-79: 671-674.
Busch, A., Y. Gensterblum, et al. (2004). "Methane and carbon dioxide adsorption–diffusion experiments on coal: upscaling and modeling." International Journal of Coal Geology 60: 151-168.
Goodman, A. L., A. Busch, et al. (2004). "An Inter-laboratory Comparison of CO2 Isotherms Measured on Argonne Premium Coal Samples." Energy & Fuels 18(4): 1175-1182.
Busch, A. (2005). Thermodynamic and Kinetic Processes associated with CO2-Sequestration and CO2-Enhanced Coalbed Methane Production from unminable Coal Seams. Fakultät für Georessourcen und Materialtechnik. Aachen, Rheinisch-Westfälische Technische Hochschule Aachen: 150.
Goodman, A. L., A. Busch, et al. (2007). "Inter-laboratory comparison II: CO2 isotherms measured on moisture-equilibrated Argonne premium coals at 55 [degree sign]C and up to 15 MPa." International Journal of Coal Geology 72(3-4): 153-164.
Hildenbrand, A., B. M. Krooss, et al. (2006). "Evolution of methane sorption capacity of coal seams as a function of burial history -- a case study from the Campine Basin, NE Belgium." International Journal of Coal Geology 66(3): 179-203.
Busch, A., S. Alles, et al. (2008). "Carbon dioxide storage potential of shales." International Journal of Greenhouse Gas Control 2: 197-308.