Method and Apparatus for Controlling Incrustations in Multi Stage Evaporation Train for Black Liquor
Patent, 2012

The invention relates to a method and apparatus for reducing the formation of incrustations during concentration of black liquor in a multiple-effect (1A-1B-1C) evaporation process. When the solubility level of salts in the black liquor is exceeded in a specific evaporation stage, at least a part of the concentrated black liquor is extracted after having passed said specific evaporation stage and subjected to a first separation process (SEP). In said separation process crystals (particles) of said salt are separated and at least a part of the salt crystals are recycled (RFR) directly into or to a position before said specific evaporation stage. This results in reduced formation of incrustations as well as reduced precipitation in the evaporation stages.


Lars Olausson

Industriella energisystem och tekniker

Ulf Andersson

Mathias Gourdon

Industriella energisystem och tekniker

Lennart Vamling

Industriella energisystem och tekniker

Metso Power AB




Pappers-, massa- och fiberteknik



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