Process and device for evaporating liquids, for example black liquor from cellulose cooking, which contain solid and dissolved substances
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United States of America Patent
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May 3, 2005
Grant Date -
Jun 10, 2004
app pub date -
Nov 20, 2001
filing date -
Nov 22, 2000
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Abstract
The present invention relates to a process and a device for evaporating liquids, for example black liquor from cellulose cooking, which contain solid and dissolved substances which are to be concentrated. The liquid is heated to close to boiling temperature in a heat exchanger (1) of the falling-film type. The process is characterized in that the pressure on the liquid side in the falling-film heat exchanger (1) is kept so high that boiling does not take place in this heat exchanger and in that the evaporation takes place, by means of flashing, in a separate expansion tank (7) that has a lower steam.
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