FIELD: process engineering.
SUBSTANCE: this invention relates to steam generation from black alkali liquor in pulp-and-paper plant boiling pot. Black liquor first flow is removed from boiling pot and evaporated with the help of live steam heat carrier. Note here that evaporated liquor has increased content of dry substances. At evaporation, steam is produced to be used for heating fibrous material in said boiling pot. Black liquor second flow removed from boiling pot is subjected to instantaneous evaporation for obtained steam to be directed into at least one heat exchanger for indirect heat exchange with pure evaporated fluid to get clean steam. Said clean steam is used for steaming of wood chips.
EFFECT: decreased steam consumption, power saving, better methanol recovery.
5 cl, 1 dwg
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