Method for evaporation of spent liquor

Details Method for evaporation of spent liquor Method for evaporation of spent liquor

1986-06-03

1988-12-06

Lacey, David L.

Concentrating evaporators

Processes

Involving waste liquid

159 23, 159 173, 159 23, 159DIG8, 159DIG32, 203 27, 203 88, 203DIG8, 202174, 202235, 162 46, 162 47, B01D 126, B01D 306

Patent

active

047894288

ABSTRACT:
The invention relates to a method for evaporation of spent liquor by heat from a blow condenser where blow steam from a pulp cooker is condensed in a direct condenser connected with a hot water accumulator. Spent liquor heated indirectly by hot water from the accumulator is brought to expand and released expansion vapor is used as a heat medium in a following evaporation stage. The apparatus comprises a heat exchanger, at least one flash tank and at least one evaporation unit, the heat exchanger being disposed to receive hot water from the upper part of the accumulator and to return it to its lower part and thus heat the spent liquor, and the flash tank being disposed to receive spent liquor heated in the heat exchanger and to release liquor vapor and spent liquor to the evaporation unit.

REFERENCES:
patent: 3286763 (1966-11-01), Jacoby
patent: 3289736 (1966-12-01), Rosenblad
patent: 3492198 (1970-01-01), Rosenblad
patent: 3753851 (1973-08-01), Gaillard
patent: 4076576 (1978-02-01), Marttala
patent: 4333800 (1982-06-01), Henricson
Rosenblad, "Evaporator Systems For Black Liquor Concentration", CEP, Apr. 1976, pp. 53-60.
Jacoby, "Evaporation by Secondary and Waste Heats", Jul. 1966, vol. 49, No. 7, pp. 95-97.

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