A method to use heat energy from black liquor

Details A method to use heat energy from black liquor A method to use heat energy from black liquor

D - Textiles, Paper

21

C

D21C 3/24 (2006.01) D21C 3/22 (2006.01)

Patent

CA 2670274

The present invention concerns a method to retrieve heat from black liquor, where the black liquor is withdrawn from a digester (10) in association with the production of cellulose pulp. The black liquor at the withdrawal stage maintains a first withdrawal temperature. The invention is characterised in that at least a part of the black liquor is led to a heat exchanger (11). An exchange of heat takes place in the heat exchanger between the black liquor and a bleaching filtrate that has been obtained from the bleaching plant. The exchange of heat results in the bleaching filtrate experiencing a raise in temperature of at least 5 0C, after which the heated bleaching filtrate is used in the bleaching plant.

La présente invention concerne un procédé destiné à récupérer de la chaleur à partir d'une liqueur noire, la liqueur noire étant extraite d'un digesteur (10) en association avec la production de pâte de cellulose. La liqueur noire, au stade de l'extraction, maintient une première température d'extraction. L'invention est caractérisée en ce qu'au moins une partie de la liqueur noire est acheminée vers un échangeur (11) de chaleur. Un échange de chaleur a lieu dans l'échangeur de chaleur entre la liqueur noire et un filtrat de blanchiment obtenu à partir de l'installation de blanchiment. L'échange de chaleur fait que le filtrat de blanchiment subit une élévation de température d'au moins 5°C, après quoi le filtrat de blanchiment réchauffé est utilisé dans l'installation de blanchiment.

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