I have covered this subject under different postings in the past [March and April 2007]. However, this is an up to date review with some new information regarding the nature of scaling in black liquor evaporators [1].
Sodium salt scaling takes place in black liquor [BL] evaporators, smelt dissolving tanks and green liquor lines. Scaling occurs when crystals nucleate from solution on pipe walls or heat transfer surfaces. In a solution containing no precipitated salt, nucleation occurs when the solution become supersaturated to the point where the metastable limit for the system is exceeded. The level of supersaturation depends on the solution, the process, the number of hetero-nuclei, the heating rate, the residence time and, sometimes, the shear rate [1]. Click to continue »
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