Process and apparatus for the treatment of a carbon...

B - Operations – Transporting – 01 – D

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Details

B01D 53/047 (2006.01) C01B 31/20 (2006.01) F25J 3/02 (2006.01) F25J 3/06 (2006.01)

Patent

CA 2743718

The invention relates to a process and an apparatus for the treatment of a carbon dioxide-containing gas stream from a large-scale combustion plant, in particular of a power station. The gas stream is separated in a carbon dioxide purification stage R into a gas substream having an increased carbon dioxide content and a gas substream having a reduced carbon dioxide content. The gas substream having an increased carbon dioxide content is fed to a further use and/or storage S. In particular, compression of the carbon dioxide under the ground can reduce the emission of gases which affect the climate. To increase the proportion of compressible C02, it is proposed that the gas substream having a reduced carbon dioxide content is fed to a pressure swing adsorption stage PSA in which a fraction which is rich in carbon dioxide and a fraction which is low in carbon dioxide are produced. The fraction which is rich in carbon dioxide is recirculated to the carbon dioxide purification stage R or is passed directly to further use and/or storage S.

L'invention concerne un procédé et un dispositif de traitement d'un courant de gaz contenant du dioxyde de carbone provenant d'une grande installation de combustion, notamment d'une centrale électrique. Le courant de gaz est séparé lors d'une première étape de purification de dioxyde de carbone R en un courant partiel de gaz ayant une teneur accrue en dioxyde de carbone et un courant partiel de gaz ayant une teneur réduite en dioxyde de carbone. Le courant partiel de gaz ayant une teneur accrue en dioxyde de carbone est acheminé vers une valorisation ultérieure et/ou un stockage S. L'émission de gaz nuisibles pour le climat peut être réduite notamment par compression du dioxyde de carbone dans le sous-sol. Pour augmenter la fraction de CO2 compressible, il est proposé que le courant partiel de gaz ayant une teneur réduite en dioxyde de carbone soit acheminé vers une étape d'adsorption à pression alternée PSA dans laquelle une fraction riche en dioxyde de carbone et une fraction pauvre en dioxyde de carbone sont produites. La fraction riche en dioxyde de carbone est acheminée vers l'étape de purification de dioxyde de carbone R ou est acheminée directement vers la valorisation ultérieure et/ou le stockage S.

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