Method and device for separating carbon dioxide from a waste gas of a fossil fuel-operated power plant
First Claim
1. A method for separation of carbon dioxide from a flue gas of a fossil-fueled power station, comprising:
- burning a fossil fuel in a combustion process coupled to a generator to provide a source of electric power, the combustion process producing a hot off-gas comprising carbon dioxide;
bringing the hot off-gas comprising carbon dioxide into contact with an absorption medium in an absorption process where carbon dioxide is absorbed by the absorption medium forming a loaded absorption medium;
thermally forcing out gaseous carbon dioxide of the loaded absorption medium in a desorption process and extracting a portion of the absorption medium from the loaded absorption medium;
injecting a supply of steam into the loaded absorption medium, with the condensation heat released by condensation of the steam being transferred to the loaded absorption medium, wherein the steam supply injected into the loaded absorption medium is extracted from a steam generator process which is not coupled to the same combustion process or the generator of the power station which provides the source of electric power, andwherein the steam is injected into the desorption process at a plurality of points.
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Abstract
A method for separating carbon dioxide from a flue gas of a fossil fuel-operated power plant is provided. In the method, a fossil fuel is initially burned in a combustion process, wherein a hot waste gas containing carbon dioxide is produced. In a next process step, waste gas containing carbon dioxide is brought into contact with an absorption medium in an absorption process, wherein carbon dioxide is absorbed by the absorption medium, thus forming a charged absorption medium. Next, gaseous carbon dioxide is thermally expelled from the charged absorption medium in a desorption process. For this purpose, a vapor is supplied to the desorption process, the vapor is injected into the charged absorption medium, wherein the condensation heat released by the condensation of the vapor is transferred to the charged absorption medium, and the partial pressure of the carbon dioxide is simultaneously reduced in the desorption unit.
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Citations
5 Claims
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1. A method for separation of carbon dioxide from a flue gas of a fossil-fueled power station, comprising:
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burning a fossil fuel in a combustion process coupled to a generator to provide a source of electric power, the combustion process producing a hot off-gas comprising carbon dioxide; bringing the hot off-gas comprising carbon dioxide into contact with an absorption medium in an absorption process where carbon dioxide is absorbed by the absorption medium forming a loaded absorption medium; thermally forcing out gaseous carbon dioxide of the loaded absorption medium in a desorption process and extracting a portion of the absorption medium from the loaded absorption medium; injecting a supply of steam into the loaded absorption medium, with the condensation heat released by condensation of the steam being transferred to the loaded absorption medium, wherein the steam supply injected into the loaded absorption medium is extracted from a steam generator process which is not coupled to the same combustion process or the generator of the power station which provides the source of electric power, and wherein the steam is injected into the desorption process at a plurality of points. - View Dependent Claims (2, 3, 4, 5)
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Specification