Method to use heat energy from black liquor
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United States of America Patent
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Oct 1, 2013
Grant Date -
Jan 21, 2010
app pub date -
Nov 20, 2007
filing date -
Nov 22, 2006
priority date (Note) -
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Abstract
The method is for retrieving heat from black liquor wherein the black liquor is withdrawn from a digester in association with the production of cellulose pulp. The black liquor at the withdrawal stage maintains a first withdrawal temperature. At least a part of the black liquor is led to a heat exchanger. An exchange of heat takes place in the heat exchanger between the black liquor and a bleaching filtrate that has been obtained from the bleaching plant. The exchange of heat results in the bleaching filtrate experiencing a raise in temperature of at least 5° C., after which the heated bleaching filtrate is used in the bleaching plant.
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