The site operates an evaporation plant that concentrates the black liquor for further thermal utilization in the recovery boiler.
During the evaporation and subsequent condensation process, different types of condensates with different impurity contents occur at several points.
In connection with considerations on water savings in the production, the increased use of B-condensate for various tasks is now favored. To do this, the condensate has to be treated because it contains methanol and odorous sulfur compounds. To ensure that, GIG Karasek – a specialist for thermal separation technologies, is realizing a new stripping column to treat the impured B-Condensate. The installation includes a stripper, which separates the volatile components from the water such as methanol. Additionly, an ideally suitable plate falling film evaporator is used as overhead condenser which will be delivered from GIG Karasek also.
In this way, the heat of condensation can be integrated into the evaporation process without the need of additional fresh water or an alternative condenser. This results in the highest possible energy efficiency and in an increasement of the evaporation capacity.
The installation also includes a new concentrator, which results in flexible cleaning options and the evaporation temperatures in the concentrators can be kept moderate.
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