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Recovery Boiler
Proven FT-NIR application for recovery boiler and smelt dissolving tank optimization
Recovery Boiler Challenges
Optimization of the recovery boiler in a Kraft mill has been an ongoing challenge for the pulp industry due to the lack of an online sensor for measuring the concentration of key green liquor parameters, such as TTA, for control. Traditional online techniques (i.e., density, conductivity, differential pressure, and bubble tubes) only infer key measurements and suffer from drifting due to probe scaling. Online titrators have not yet been applied to raw green liquor measurements, as the presence of solids reduces the accuracy of volume metering.
FITNIR Solution
FITNIR Analyzers provides more reliable, accurate, and true concentrations of unclarified and clarified green liquor chemical compositions in the recovery boiler and smelt dissolving tank. Our analyzers enable superior TTA control, operation at the highest TTA target, as well as measurements of deadload content all necessary for optimal efficiency.
Properties Measured
FITNIR’s Recovery Boiler analyzer application measures Unclarified and Clarified Green Liquor:
- Total Titratable Alkali (TTA)
- Sodium Sulfide (Na2S)
- Effective Alkali (EA)
- Sodium Thiosulfate (Na2S2O3)
- Active Alkali (AA)
- Sodium Carbonate (Na2CO3)
- Sodium Sulfate (Na2SO4)
- Reduction Efficiency (RE)
Key Benefits
- $0.5 – $1.2M savings/year
- 6 – 12 months ROI
- Fewer lab tests required
- Reduced deadload content (sulphate)
- Maximized TTA target while providing true TTA target
- Reduced TTA (and carbonate, EA, sulphide) variability
Project highlights
Clearwater Paper, Lewiston Mill
Weyerhaeuser, Grande Prairie Mill
Zellstoff Celgar
Paper Excellence, Skookumchuck Pulp Inc.
Mill in Eastern Canada
Lewiston, ID
Grande Prairie, AB, Canada
Castlegar, BC, Canada
Skookumchuck, BC, Canada
Eastern Canada
FITNIR Online
FITNIR Benchtop
FITNIR Online – CGL
FITNIR Online – CGL
FITNIR Online
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