Make-up liquor and black liquor evaporating processes during...

Details Make-up liquor and black liquor evaporating processes during... Make-up liquor and black liquor evaporating processes during...

D - Textiles, Paper

21

C

9/37, 9/36.9

D21C 11/10 (2006.01)

Patent

CA 1273455

MAKE-UP LIQUOR AND BLACK LIQUOR EVAPORATING PROCESS DURING PULP PRODUCTION ABSTRACT OF THE DISCLOSURE 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.

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