Reach the Perfect Temperature with Regular Heating System Maintenance, Paper360º September/October 2022

Green liquor heaters make the slaking process run better in kraft mill applications. However, green liquor is very demanding on the heater. Annual inspection and maintenance of your heating systems ensure that your green liquor stays at the optimum temperature.

Exact temperature management in the kraft mill process is critical for conversion efficiency in recausticizing green liquor and its product of NaOH and calcium carbonate (CaCO₃) composition. Green liquor feed temperatures to the slaker have a heating range from 180˚F to 200˚F (82˚C to 93˚C). The goal of every mill is to optimize this temperature without boiling over the slaker—but what happens if the green liquor is not hitting the temperature? In that case, a mill can see poor sodium hydroxide conversion, lower chemical recovery, and the need for makeup chemicals. 

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