Method of inhibiting scaling in black liquor evaporators
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United States of America Patent
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Jul 18, 2000
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app pub date -
Feb 20, 1998
filing date -
Feb 21, 1997
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Abstract
A method of inhibiting calcium carbonate scaling in a multi-stage evaporation plant of black liquor by heat-treating calcium-containing liquor includes a first stage wherein the calcium-containing liquor is heated to about 110-145.degree. C. with direct contact with the heating medium; a second stage wherein the liquor is maintained at this temperature in a retention tank for 1-20 minutes to reduce the amount of calcium in the liquor by precipitating calcium carbonate; and a third stage wherein the heat-treated liquor is evaporated for combustion.
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