CO2 Separation by Carbonate Looping Including Additional Power Generation with a CO2-H2O Steam Turbine

Usually the separation of CO2 from the flue gas in power plants is connected with high efficiency losses, independent of separation technology. The reason is that the separation processes of the pre- or post-combustion capture or using an oxy-fuel process as proposed today result in additional energy consumption. But there are also sorbents, e.g., lime, that form carbonates and release heat at a temperature level of about 600 degrees C and will be calcinated at higher temperatures (about 900 degrees C). Integration of these processes in the design of a conventional power plant and production of additional power output by integration of another Rankine cycle using the separated CO2 and steam minimizes efficiency losses. The simulation and the results of such a CO2 capture process are described in this paper.