Method for evaporation of spent liquor

Details Method for evaporation of spent liquor Method for evaporation of spent liquor

D - Textiles, Paper

21

C

9/36.9

D21C 11/10 (2006.01) B01D 1/26 (2006.01)

Patent

CA 1274058

(57) Abstract The invention relates to a method for evaporation of spent liquor by means of heat from a blow condenser where blow steam from a pulp cooker is condensed in a direct condense connected with a hot water accumulator. Spent liquor heated indirectly by hot water from the accumulator is brought to expand and released expansion vapor is used as a heat medium in a following evaporation stage. The apparatus comprises a heat exchanger, at least one flash tank and at least one evaporation unit, the heat exchanger being disposed to receive hot water from the upper part of the accumulator and to return it to its lower part and thus heat the spent liquor, and the flash tank being disposed to receive spent liquor heated in the heat exchanger and to release liquor vapor and spent liquor to the evaporation unit. Fig.1.

511298

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