Introduction
Wood pulp and paper production are complex operations, requiring air, specialty gas and liquid measurement. pulp and paper industry applications, including chemical dosing, bleaching, coloring, and black liquor processing. harsh environments or with aggressive and abrasive media like those found in pulp and paper applications.
Advantage and challenge
Advantage:
•Can be configured with a range of materials to match process needs
•Non-plugging with no ports or impulse lines
•Full diameter with no pressure drop across meter
•Cost-effective in sizes from fractional through sizes larger than 36”
•Very low maintenance
Challenge:
Noisy stock flows, aggressive chemicals, abrasive materials, and high process temperatures will affect the meaasuring accuracy. Most magnetic flowmeters operate at low coil Most magnetic flowmeters operate at low coil drive frequencies, where impingement noise drive frequencies, where impingement noise can result in low signal can result in low signal--to--noise ratios.
Solution
Teflon is the most commonly used liner material in the mill due its good resistance to chemicals and abrasion.
With corrosion resistant and leak tight electrodes, it offers good corrosion, erosion, and abrasion resistance.To deal with the challenging noisy process fluids like extremely viscous pulp stock, low noise electrode options are also available.
Selectable frequency capability allows selectable frequency capability allows the mill to increase the coil frequency to allows the mill to increase the coil frequency to a frequency with less impingement noise, a frequency with less impingement noise, resulting in a higher signal resulting in a higher signal--to--noise ratio.
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