| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: invention relates to a method and equipment for evaporating hot black liquor obtained from the cooking process during cellulose pulp production, where the black liquor is fed into a multi-stage evaporation line with at least five evaporation stages. According to the invention, black liquor (11, 10), which must undergo evaporation in the evaporation line, is cooled in at least one heat exchange process in a heat exchanger (HE1) relative partially evaporated black liquor (20, 21), which undergoes evaporation in at least one stage (I). The black liquor which must be evaporated is cooled and the partially evaporated black liquor is heated by at least 5-10C. ^ EFFECT: saving heat, improved separation of methanol through cooling the black liquor, low risk of foaming. ^ 19 cl, 5 dwg |
