Abstract: A process and a device for treating a carbon dioxide-containing flue gas stream are described. At least a part of the carbon dioxide present is removed from the flue gas stream by means of a scrubber, forming a low carbon dioxide gas stream and a high carbon dioxide gas stream. The high carbon dioxide and water-saturated gas stream formed from the flue gas stream after removal of the carbon dioxide is cooled by means of a refrigeration system 4 in a heat exchanger 3 below the dew point temperature of the water contained in the gas stream and dried by condensing and separating out the water in a condensate separator 5. The dried gas stream meets the requirements of carbon dioxide products intended for further use.

Abstract: The invention relates to a method and a device for treating a carbon-dioxide-containing gas stream, in particular from a large-scale fired plant, e.g. from a power plant. The precompressed gas stream is separated in a carbon dioxide purification stage into a gas substream having an elevated carbon dioxide content (carbon dioxide product stream) and a gas substream having a decreased carbon dioxide content (vent gas stream). The carbon dioxide product stream is fed to further utilization and/or storage. In particular, by injecting the carbon dioxide underground, the emission of gases harmful to the climate can be reduced. For improving the energy efficiency, it is proposed that the vent gas stream is expanded in at least one expansion turbine and both the resultant kinetic energy and the resultant refrigeration are utilized for energy recovery.