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Objectives and outline of the project CO2-DISSOLVED stands for “CO2 Dependable Injection and Storage System Optimized for Local Valorization of the geothermal Energy Delivered”. The objective of this project is to assess the technical-economic feasibility of a novel CCS concept integrating geothermal energy recovery, aqueous dissolution of CO2, and an innovative post-combustion CO2 capture technology. The approach (see Figure 1) includes: CO2 capture and separation in an innovative aqueous based technology. Extraction of aquifer brine in a doublet designed for heat extraction via a surface heat exchanger system similar to that used in classical low energy geothermal facilities. Re-injection of the cooled brine in the injection well of the doublet equipped with a patented novel CO2 capture system designed to separate and dissolve the CO2. The proposed concept combines several objectives including greenhouse gas reduction, renewable energy production, and the assessment of a novel, low cost capture and storage method. Further, the proposed use of dissolved CO2 versus injection in a supercritical phase offers substantial benefits in terms of lower brine displacement risks, lower CO2 escape risks, and the potential for more rapid mineralization. Figure 1 Schematic representation of the innovative CCS concept proposed in the CO2-DISSOLVED project. Initial modeling indicates that the proposed injection of the CO2-rich cooled brine strengthens the density contrast such that the injected water will naturally sink toward the deepest layers of the aquifer and migrate along the bottom of the formation with low to no tendency to escape in upward joints, faults, or other avenues. We propose that this may result in significant increases in storage safety with eventual decreases in monitoring and containment requirements. Further we propose that the injection of dissolved CO2 will reduce brine displacement risks and will move the process more quickly toward mineralization. Sustainable Earth Sciences 2013 30 September - 4 October 2013, Pau, FrancePDF Image | CO2-Dissolved Combining CCS and Geothermal Heat Recovery
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