Methods to decrease scaling in digester systems

Details Methods to decrease scaling in digester systems Methods to decrease scaling in digester systems

D - Textiles, Paper

21

C

D21C 3/22 (2006.01)

Patent

CA 2570997

One aspect of this invention relates to a method and digester for reducing the deposition of calcium-based scale in a wood chip digester including extraction from the digester of first and second quantities of cooking liquor having respective first and second calcium concentrations, treating the extracted cooking liquors to produce a cooking liquor having a calcium concentration less that the calcium concentration of the either of the first and second extracted cooking liquors, and, reintroducing the treated cooking liquor to the digester. Another aspect of this invention relates to a method and digester in which through put through the digester is increased by the continuous addition of process liquor into the digester preferably at an upper region of the digester.

Un aspect de cette invention concerne un procédé et un lessiveur permettant de réduire la formation des dépôt de tartre dans un lessiveur à copeaux de bois. Cela implique d'extraire du lessiveur des premières et secondes quantités de liqueur de cuisson présentant respectivement des premières et secondes teneurs en calcium. On traite ensuite les liqueurs de cuisson de façon à obtenir une liqueur de cuisson dont la teneur en calcium est inférieure aux deux liqueurs de cuisson extraites. On réintroduit ensuite dans le lessiveur la liqueur de cuisson traitée. Un autre aspect de cette invention concerne un procédé et un lessiveur permettant d'augmenter le débit du lessiveur par une adjonction en continu d'une liqueur de traitement dans le lessiveur, de préférence dans la zone haute.

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