Abstract
Optimum wash water usage level, at which washing losses are satisfactory, was determined by using 12 separate real-time refractometer measurements and advanced process data analysis tools. Refractometers measure total dissolved solids with high reliability. We analyzed the results with the WEDGE trademarked software tool to calculate various parameters of washing performance. All tests were performed on a mill-scale brown stock washing operation at a Finnish pulp mill. Total dissolved solids changes in the incoming flows (liquid and pulp suspension) to the washer were detected immediately and reliably by using refractometer measurements. The changes also had a clear effect on washing loss in the brown stock line’s oxygen delignification performance. Real-time measurement enabled high-level control of the washing line, instant information made it possible to control the amount of fresh water to the washer, and proper control of such a system optimized water usage.
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