A method for removing and recovering co2 from exhaust gas

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 53/14 (2006.01) B01D 53/62 (2006.01)

Patent

CA 2362773

The present invention relates to a method for removing and recovering CO2 from exhaust gas from a power and/or heat generating plant (a main power plant) by chemical absorption and desorption respectively, where the exhaust gas is fed to an absorber using a chemical absorbent where the CO2 is absorbed in said absorbent and a CO2-depleted exhaust gas stream is formed. The CO2 rich absorbent is further fed to a desorber where CO2 is removed from the absorbent, and the absorbent essentially free of CO2 is recirculated to the absorber and the desorbed CO2 gas is discharged off. The exhaust gas is cooled and recompressed to an elevated pressure, in a compressor in a secondary power plant integrated with the main power plant, said absorber, and said desorber, before entering the absorber. The CO2-depleted exhaust gas emerging from the absorber is reheated and further expanded in an expander in said secondary power plant.

L'invention concerne une technique permettant d'éliminer et de récupérer le CO2 des gaz d'échappements d'une centrale énergétique et/ou thermique (centrale principale) respectivement par absorption et désorption chimiques. Le gaz d'échappement est dirigé vers un absorbeur utilisant un absorbant chimique où le CO2 est absorbé, créant un écoulement de gaz appauvri en CO2. L'absorbant riche en CO2 vient ensuite alimenter un désorbeur, où le CO2 est éliminé de l'absorbant qui, pratiquement exempt de CO2, est remis en circulation vers l'absorbeur, le CO2 gazeux désorbé étant déchargé. Le gaz d'échappement est refroidi et recomprimé à une pression élevée dans un compresseur d'une centrale secondaire intégrée à la centrale principale, à l'absorbeur et au désorbeur, avant de pénétrer dans l'absorbeur. Le gaz d'échappement appauvri en CO2 sortant de l'absorbeur est réchauffé puis expansé dans un expanseur au sein de ladite centrale secondaire.

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