Make-up liquor and black liquor evaporating processing during pu

Paper making and fiber liberation – Apparatus – Digester

Patent

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Details

162 37, 162 47, 159 473, B01D 126, D21C 1106, D21C 1110

Patent

active

048971570

ABSTRACT:
The number 2 flash tank of a black liquor energy recovery system associated with a continuous pulp digester is eliminated, and other advantages are obtained. After flashing in the number 1 flash tank, concentrated black liquor passes to a multiple effect evaporator system as the heating fluid supplied to the last effect. The heated black liquor passes in heat exchange relationship with excess make-up liquor from the high pressure feeder circulation system and/or with portions of the extracted black liquor that have had more of their heat content removed, the heated black liquor effecting evaporation of the excess make-up liquor and/or portions of the black liquor. Steam from the steam relief of the steaming vessel may be used as a secondary heating fluid source for the first effect.

REFERENCES:
patent: 2942657 (1960-06-01), Kleinschmidt
patent: 4401516 (1983-08-01), Olson et al.

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