Method of inhibiting scaling in black liquor evaporators

Details Method of inhibiting scaling in black liquor evaporators Method of inhibiting scaling in black liquor evaporators

D - Textiles, Paper

21

C

D21C 11/00 (2006.01) D21C 11/10 (2006.01)

Patent

CA 2229973

The present invention relates to a method of inhibiting calcium carbonate scaling in a multi-stage evaporation plant of black liquor by heat-treating calcium- containing liquor. The method comprises the following stages: a) the calcium-containing liquor is heated to about 110 - 145 °C with direct contact with a heating medium; b) the liquor is maintained at this temperature in a retention tank for 1 - 20 minutes to reduce the amount of calcium in the liquor by precipitating calcium carbonate; and c) the heat-treated liquor is evaporated for combustion.

L'invention porte sur une méthode pour prévenir l'entartrage par le carbonate de calcium d'une unité d'évaporation multiétagée de liqueur noire, par traitement thermique de cette liqueur renfermant le calcium. La méthode comprend les étapes suivantes : a) la liqueur avec son calcium est chauffée à environ 110-145 degrés C par contact direct avec un milieu de chauffage; b) la liqueur est maintenue à cette température dans une cuve de retenue pendant 1-20 minutes afin de réduire, par précipitation du carbonate de calcium, la quantité de calcium qu'elle renferme; c) après ce traitement thermique, la liqueur est évaporée pour combustion.

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