| 摘要 |
Abstract Method and device for treating a carbon dioxide-containing gas stream 5 The invention relates to a method and a device for treating a carbon dioxide-containing gas stream, in particular from a large-scale furnace plant, e.g. from a power plant. The precompressed gas stream (1) is partially liquefied in a cryogenic carbon dioxide purification stage (2, 3, 4). The liquid is subsequently separated off. From the liquid that is separated off, a gas stream having an elevated carbon dioxide content (carbon 10 dioxide gas stream) (7) is obtained by reevaporation. From the non-liquefied raw gas, a gas stream having a reduced carbon dioxide content (vent gas stream) is obtained. The vent gas stream is expanded in at least one expansion turbine (5, 6) and the refrigeration generated in this process is recovered for cooling the raw gas stream. The carbon dioxide gas stream is compressed (8) to a final pressure and fed to further 15 utilization and/or storage. In particular, by injecting the carbon dioxide below ground, the emission of gases that are harmful to the climate can be reduced. For improving the energy efficiency, it is proposed that, from some of the liquid that is separated off in the cryogenic carbon dioxide purification stage, a liquid stream having an elevated carbon dioxide content (carbon dioxide liquid stream) is obtained which is fed in a liquid 20 phase (9) to further utilization and/or storage (10). (Fig. 3) .Fig. 3 |
