Alkali measurements are used to determine chemical consumption during the various Kraft cooking phases in the digester. These measurements are widely accepted as standard monitoring information, as they provide a solid basis for cooking management and digester optimization. Traditional measurement methods, such as conductivity and autotitration, tend to foul and drift while only inferring actual values.
FITNIR’s FT-NIR technology offers the most comprehensive and accurate measurements of true pulp liquor properties measurements necessary for an optimal digester environment, devoid of fouling or drifting issues. Our analyzers reliably and accurately provide white liquor EA (Effective Alkali) and sulphidity, as well as black liquor REA (Residual Effective Alkali) at the various cooking zones. Control strategies using reliable data from our analyzers can significantly reduce kappa variation, overcooking and rejects while increasing pulp quality.
FITNIR’s Digester analyzer application measures black liquor compositions:
*FITNIR Online measurement only
Weyerhaeuser, Grande Prairie Mill
Grande Prairie, AB, Canada
CANFOR Pulp, Northwood Pulp Mill
Prince George, BC, Canada
(2001, upgraded in 2009)
Mill in Eastern Canada
(1996, upgraded 2007)
Crofton, BC, Canada
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