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- 2016 (2)
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- Englisch (2)
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- Associated incidental substances (1)
- CCS (1)
- Corrosion (1)
- Explosion groups (1)
- Explosion regions (1)
- Fluid-rock interactions (1)
- Hydrogen energy (1)
- Impurities (1)
- Pipeline design (1)
- Power-to-gas (1)
Safety characteristics for explosion protection for mixtures of hydrogen and natural gas were studied in laboratory tests. Also calculations on the explosion zones for mixtures of hydrogen and natural gas were conducted. Moreover calculation methods for the safety characteristics of such mixtures were tested aiming to reduce the high effort for the experimental determination of safety characteristics prospectively. Admixture of up to 10 mole% hydrogen to natural gas has very low influence on safety characteristics for explosion protection. With increasing hydrogen fraction the mixtures become mainly more „critical“ considering explosion protection, an substantial influence on explosion protection occurs for hydrogen fractions of more than 25 mole%.
CO2 streams captured from power stations or industrial plants may contain impurities that impact the consecutive steps of the CO2 capture and storage (CCS) chain. As the basis for an optimization of CO2 purity over the whole CCS chain, impacts of different impurities were investigated at key steps including studies on (i) corrosion of metallic materials in CO2 streams and brine, (ii) fluid and interfacial properties as a function of pressure, temperature and CO2 stream composition and their implications for CO2 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 CO2 stream compositions typical for pre-combustion capture and oxyfuel combustion. Recommendations for material selection for compression, transport and injection were derived for various CO2 stream compositions. To reliably control corrosion, a limitation of water contents to 50 ppmv is recommended for pipeline transportation of all CO2 streams. At geological storage conditions, the presence of either O2, NOx or SO2 only weakly affected fluid-mineral/rock interactions that still impacted geomechanical rock properties.