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180% more energy than a plant of equivalent output without CCS. (Sections 1.5.1, 1.6.3, 3.6.1.3, 7.2.7). What is the current status of CCS technology? Summary for Policymakers gas stream and the higher pressure make the separation easier. Oxyfuel combustion is in the demonstration phase7 and uses high purity oxygen. This results in high CO2 concentrations in the gas stream and, hence, in easier separation of CO2 and in increased energy requirements in the separation of oxygen from air (Sections 3.3, 3.4, 3.5). 5. There are different types of CO2 capture systems: post- combustion, pre-combustion and oxyfuel combustion (Figure SPM.3). The concentration of CO2 in the gas stream, the pressure of the gas stream and the fuel type (solid or gas) are important factors in selecting the capture system. 6. Pipelines are preferred for transporting large amounts of CO2 for distances up to around 1,000 km. For amounts smaller than a few million tonnes of CO2 per year or for larger distances overseas, the use of ships, where applicable, could be economically more attractive. Post-combustion capture of CO2 in power plants is economically feasible under specific conditions5. It is used to capture CO2 from part of the flue gases from a number of existing power plants. Separation of CO2 in the natural gas processing industry, which uses similar technology, operates in a mature market6. The technology required for pre-combustion capture is widely applied in fertilizer manufacturing and in hydrogen production. Although the initial fuel conversion steps of pre-combustion are more elaborate and costly, the higher concentrations of CO2 in the Pipeline transport of CO2 operates as a mature market technology (in the USA, over 2,500 km of pipelines transport more than 40 MtCO2 per year). In most gas pipelines, compressors at the upstream end drive the flow, but some pipelines need intermediate compressor stations. Dry CO2 is not corrosive to pipelines, even if the CO2 contains contaminants. Where the CO2 contains moisture, it is removed from the CO2 stream to prevent corrosion and to avoid the costs of constructing pipelines of corrosion- Figure SPM.. Schematic representation of capture systems. Fuels and products are indicated for oxyfuel combustion, pre-combustion (including hydrogen and fertilizer production), post-combustion and industrial sources of CO2 (including natural gas processing facilities and steel and cement production) (based on Figure 3.1) (Courtesy CO2CRC). 5 “Economically feasible under specific conditions” means that the technology is well understood and used in selected commercial applications, such as in a favourable tax regime or a niche market, processing at least 0.1 MtCO2 yr-1 , with few (less than 5) replications of the technology. 6 “Mature market” means that the technology is now in operation with multiple replications of the commercial-scale technology worldwide. 7 “Demonstration phase” means that the technology has been built and operated at the scale of a pilot plant but that further development is required before the technology is ready for the design and construction of a full-scale system.PDF Image | CARBON DIOXIDE CAPTURE AND STORAGE
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