Transcription of Digester Control in the Kraft Process - Emerson
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Digester Control in the Kraft Process - Emerson
BACKGROUNDThe Kraft paper Process is particularly efficientbecause it involves continuous recycling of raw mate-rials. Wood chips are delignified by harsh chemicals(white liquor) to produce pulp and spent liquor (blackliquor). The spent liquor is later regenerated to whiteliquor in the most important physical parameter of pulpproduction is the Kappa number, which essentiallyindicates how well the chips have been the value of the Kappa number is difficultbecause the original wood chips may differ greatly incomposition and moisture content. Measuring conduc-tivity in the upper (or sometimes lower) recirculationzone of a continuous Digester can provide controlfeedback and lower variability in the Kappa number ofthe product : CHEMISTRY OF PULP DIGESTIONA continuous digesterhas a constant charge ofwood chips and a given flow rate of white liquor(basically NaOH and Na2S).
INSTALLATION OPTIONS Rosemount Analytical has three separate sensor options for this application. The Model 242 flow-through sensor is flanged and uses a PEEK or ceramic
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