Method and device for separating of carbon dioxide from an exhaust gas of a fossil-fired power plant

An apparatus, which is integrated into a fossil-fired power plant, for the separation of carbon dioxide, the apparatus comprising:

• an absorption unit, the absorption unit being connected into an exhaust line of the fossil-fired power plant such that exhaust gas containing carbon dioxide is conducted through the absorption unit,
• a desorption unit, the desorption unit being connected into a water/steam circuit of the fossil-fired power plant such that the desorption unit is operable to be heated by heating vapor extracted from the water/steam circuit,
• a connecting line connected to the absorption unit for the purpose of conducting a laden absorption medium,
• a pressure tank, wherein the desorption unit is connected to a pressure tank via an absorption medium line, such that a regenerated absorption medium can be supplied to the pressure tank and the pressure tank is connected to the desorption unit via a vapor line such that vapor can be recirculated into the desorption unit, and wherein the pressure tank is connected to the absorption unit via an absorption medium recirculation line,
• wherein the connecting line branches into at least one first subline and one second subline, the sublines being connected to the desorption unit at various junction points, and
• wherein only one heat exchanger is provided in the absorption medium recirculation line, which heat exchanger is connected at the primary side into the second subline and at the secondary side into the absorption medium recirculation line.