FIELD: textiles, paper.
SUBSTANCE: system of the cooking boiler of the pulp and paper mill produces black liquor. The stream of black liquor (7) is removed from the cooking boiler and subjected to flash evaporation to provide flash evaporation vapour. The flash evaporation vapour (10) comes into indirect heat exchange contact with at least one heat exchanger (9) with white liquor (11) or white liquor and other liquid to provide the heated white liquor (14) or the heated mixture. The black liquor (19) flash evaporated is subjected to further processing for recuperation of heat or evaporation.
EFFECT: invention enables to increase the energy savings at the pulp and paper mill.
3 cl, 2 dwg
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