Fossil fuel-fired power station having a removal apparatus for carbon dioxide and process for separating carbon dioxide from an offgas from a fossil fuel-fired power station

A fossil-fired power plant, comprising:

• a separation device for carbon dioxide which follows a combustion device and through which a carbon dioxide-containing exhaust gas is capable of flowing, the separation device, comprising:
• an absorption unit, and
• a desorption unit;
• a renewable energy source;
• and
• a heat accumulator,
• wherein the desorption unit is connected to the renewable energy source,
• wherein the heat accumulator is connected between the desorption unit and the renewable energy source,
• wherein a plurality of absorbent accumulators are connected into a scrubbing agent circuit of the separation device for carbon dioxide, and
• wherein the desorption unit is connected to a heat exchanger which is connected to the steam turbine unit of the fossil-fired power plant, so that heat energy from the steam turbine unit is administered by means of regulating devices to the desorption unit in the event of an insufficient supply of heat energy by the renewable energy source.

A method for separating carbon dioxide from an exhaust gas of a fossil-fired power plant, comprising:

• providing an absorption process and a desorption process, in which the heat energy required for the desorption process is provided by means of renewable energies;
• storing intermediately the renewably generated heat energy before being provided in the desorption process;
• and
• compensating a complete or partial undersupply of renewable heat energy to the desorption process by means of a regulating process in which the undersupply is made up by steam from a steam turbine process of the fossil-fired power plant.