Split flow process and apparatus

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 53/38 (2006.01) B01D 53/14 (2006.01) B01D 53/62 (2006.01) B01D 53/74 (2006.01) B01D 53/78 (2006.01) B01D 53/96 (2006.01)

Patent

CA 2351436

A recovery plant for recovery of a gaseous component, such as carbon dioxide, from a process gas, such as the exhaust from a combustion turbine, has an absorber (110) employing a lean solvent (126) in an upper section of the absorber and a semi-lean solvent (172) in a lower section of the absorber. A regenerator (120) extracts the gaseous component from the rich solvent (117) thereby producing a regenerated lean solvent (126) and a semi-lean solvent (127). A solvent flow control element (170) combines at least a part of the semi-rich solvent (118) from the upper section of the absorber with the semi-lean solvent (127) from the regenerator to form a mixed solvent (171), and a cooler (112) cools the mixed solvent that is subsequently fed into the lower section of the absorber (110). By cooling the mixed solvent prior to entry into the absorber, the thermal energy required to remove the carbon dioxide from the exhaust gas can be reduced.

L'invention concerne une installation de récupération, permettant de récupérer un composant gazeux, tel que du dioxyde de carbone, à partir d'un gaz de traitement, tel que le gaz d'échappement provenant d'une turbine de combustion, comprenant un absorbeur (110) qui utilise un solvant pauvre (126) dans une section supérieure de l'absorbeur et un solvant semi-pauvre (172) dans une section inférieure dudit absorbeur. Un régénérateur (120) extrait le composant gazeux du solvant riche (117), ce qui produit un solvant pauvre régénéré (126) et un solvant semi-pauvre (127). Un élément de commande (170) d'écoulement de solvant combine au moins une partie du solvant semi-riche (118) provenant de la section supérieure de l'absorbeur avec le solvant semi-pauvre (127) provenant du régénérateur, afin de former un mélange de solvants (171), et un refroidisseur (112) refroidit le mélange de solvants qui alimente ensuite la section inférieure de l'absorbeur (110). Du fait du refroidissement du mélange de solvants avant son entrée dans l'absorbeur, l'énergie thermique nécessaire pour éliminer le dioxyde carbone du gaz d'échappement peut être réduite.

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