Method and equipment for treatment of black liquor at pulp mill

Details Method and equipment for treatment of black liquor at pulp mill Method and equipment for treatment of black liquor at pulp mill

D - Textiles, Paper

21

C

D21C 11/04 (2006.01) D21C 11/12 (2006.01)

Patent

CA 2723416

The invention relates to a method and equipment for treatment of black liquor at a pulp mill in order to recover chemicals and energy contained therein. In the invention, the black liquor is pyrolyzed in a pyrolysis reactor (4), the formed gaseous components are forwarded for utilization and the solids are mixed with water, whereby the formed solids are returned to a lime burning kiln (1) and the sodium-hydroxide-containing liquid is returned to the pulp cooking process.

La présente invention a trait à un procédé et à un équipement permettant de traiter la liqueur noire dans une fabrique de pâte à papier à des fins de récupération des substances chimiques et de l'énergie contenues dans celle-ci. Selon l'invention, la liqueur noire est pyrolysée dans un réacteur de pyrolyse (4). Les composés gazeux formés sont alors acheminés jusqu'à leur lieu d'utilisation, tandis que les solides sont mélangés avec de l'eau, suite à quoi les solides formés sont placés dans un four à chaux (1) et le liquide contenant de l'hydroxyde de sodium est réinjecté dans le processus de lessivage de la pâte à papier.

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