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The pulp and paper industry has very aggressive and challenging applications for magmeters. There are corrosive Zone chemicals, high temperatures and pressures, and abrasive slurries. Yokogawa can provide the most reliable and accurate meters for each application.
In the digester application, pulp is produced by placing wood chips into a digester where it is cooked under high pressures and temperatures in a caustic solution termed white liquor (a mixture of sodium hydroxide (NaOH) and sodium sulfide (Na2S)). The mixture of wood chip and liquor is steam heated, and the wood chips are dissolved. The spent mixture of white liquor and lignin is known as "black liquor". After the cooking, the pulp is discharged from the bottom of the digester using a blow-unit through the blow valve and into the blow tank.
In the flow measurement in the digester applications, following two applications are the most challenging.
And conventional magmeters have following problems.
ADMAG AXF series delivers stability and durability in each applications that contributes maximize the plant productivity and reduce the maintenance cost.
Application | Typical process condition | Challenges | Yokogawa's solution |
---|---|---|---|
Blow Line | Fluid: Pulp Consistency: 10w/o< Process Temperature: 80-120°C Process Pressure: 2MPa max. |
• Liner abrasion • Slurry noise |
• Dual frequency excitation • Ceramic Liner (<=200mm) • PFA lined AXF with metal hat(>200mm) |
Circulation /Extraction Line | Fluid: High Consistency Caustic Soda Process Temperature: 150-180°C Process Pressure: 2MPa max. |
• High temperature • High pressure • High consistency alkali • Adhesive fluid |
• PFA lined AXF with insertion type electrode & metal hat • Flange type recommended |
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ADMAG AXF (Remote type) |
The AXF magnetic flow meter is a sophisticated product with outstanding reliability and ease of operation, developed on the basis of decades of field experience. Based on FOUNDATION™ fieldbus specifications, AXF Fieldbus Magnetic Flow meter models offer more flexible instrumentation.
Yokogawa's experience with magnetic flowmeters spans decades. Our magnetic flow meters provide flexible configurations for industrial use in most areas.
Contact a Yokogawa Expert to learn how we can help you solve your challenges.