Towards an optimization of the CO2 stream composition—A whole-chain approach.

CO 2 streams captured from power stations or industrial plants may contain impurities that impact the consecutive steps of the CO 2 capture and storage (CCS) chain. As the basis for an optimization of CO 2 purity over the whole CCS chain, impacts of different impurities were investigated at key steps including studies on (i) corrosion of metallic materials in CO 2 streams and brine, (ii) fluid and interfacial properties as a function of pressure, temperature and CO 2 stream composition and their implications for CO 2 transport, injection and geological storage, (iii) costs of different pipeline design options, (iv) geochemical alterations at typical reservoir conditions and their implications for geomechanical rock properties. Major findings are synthesized for two exemplary single source-single sink CCS chain scenarios involving CO 2 stream compositions typical for pre-combustion capture and oxyfuel combustion. Recommendations for material selection for compression, transport and injection were derived for various CO 2 stream compositions. To reliably control corrosion, a limitation of water contents to 50 ppm v is recommended for pipeline transportation of all CO 2 streams. At geological storage conditions, the presence of either O 2 , NO x or SO 2 only weakly affected fluid-mineral/rock interactions that still impacted geomechanical rock properties. [ABSTRACT FROM AUTHOR]