Reactivation of lime-based sorbents by co2 shocking

Details Reactivation of lime-based sorbents by co2 shocking Reactivation of lime-based sorbents by co2 shocking

B - Operations, Transporting

01

J

B01J 20/04 (2006.01) B01D 53/62 (2006.01) B01J 20/34 (2006.01)

Patent

CA 2543984

The present invention discloses a method and an apparatus for reactivating lime-based sorbents and increasing the carbon dioxide-capture capacity of the sorbent in the combustion of carbon-containing fuels. The method of the present invention seeks to increase the carbon dioxide capture capacity of lime-based sorbents by applying concentrated or 100% carbon dioxide directly to a lime-based sorbent. Optionally, the lime-based sorbent may be pretreated using a hydration process after each process of carbon dioxide separation. The regenerated sorbent is carbonated in a presence of concentrated carbon dioxide and elevated temperatures. The invention is useful in reducing the need to add additional sorbent to maintain the carbonation/calcination cycle. The regenerative potential of the sorbent as manifested by the present invention leads to increased carbon dioxide-capture capacity of the sorbent.

L'invention concerne un procédé et un appareil de réactivation de sorbants à base de chaux, et d'augmentation de la capacité de capture de dioxyde de carbone du sorbant dans la combustion de combustibles contenant du carbone. Le procédé de la présente invention vise à augmenter la capacité de capture de dioxyde de carbone de sorbants à base de chaux par application de dioxyde de carbone concentré ou à 100 % directement sur un sorbant à base de chaux. Le sorbant à base de chaux peut éventuellement être prétraité au cours d'un processus d'hydratation après chaque processus de séparation de dioxyde de carbone. Le sorbant régénéré est carboné en présence de dioxydes de carbone concentrés à des températures élevées. L'invention permet de réduire le besoin d'ajouter un sorbant supplémentaire pour maintenir le cycle de carbonatation/calcination. Le potentiel régénérateur du sorbant mis en évidence par la présente invention augmente la capacité de capture de dioxyde de carbone du sorbant.

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