Digester
Proven FT-NIR application for digester optimizationDigester Challenges
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 Solution
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.
Properties Measured
FITNIR’s Digester analyzer application measures black liquor compositions:
- REA
- Organic Solids*
- Inorganic Solids*
- Total Solids*
- Lignin
- Density
*FITNIR Online measurement only
^ Click on Diagram to Enlarge
Key Benefits
- $1 – 2M savings/year
- 3 – 6 months average ROI
- Improved digester control
- Reduced kappa variability
- Decreased bleaching cost
- Reduced off-grade pulp
- Reduced overcooking and rejects for improved pulp quality
- More efficient white liquor consumption
- Fewer lab tests required
- Improved yield
Project Highlights
Weyerhaeuser, Grande Prairie Mill
Grande Prairie, AB, Canada
FITNIR Benchtop
CANFOR Pulp, Northwood Pulp Mill
Prince George, BC, Canada
FITNIR Online
Mill in Eastern Canada
Eastern Canada
FITNIR Online
Catalyst Paper
Crofton, BC, Canada
FITNIR Online
Get in Touch
Contact FITNIR Analyzers Inc. and we can work together to optimize your digester operations.
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