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Steel & Metal
 
     
 
Operating Unit / Process What to Control Why Is It Difficult Which MFA to Use
Gas mixing plant

Application Sheet
Article
Heating value Quality variable with large time delays Anti-delay MFA
Gas pressure Large disturbances Robust MFA
Gas flow Large disturbances Robust MFA
Furnaces (reheating, annealing, sintering, etc.)

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Outlet temperature Large time delays Anti-delay MFA
Zone temperature Multiple zones MIMO MFA
Combustion Optimal fuel-air-ratio SISO MFA
Rotary kilns

Application Sheet
Outlet temperature Large time delays Anti-delay MFA
Large load changes Feedforward MFA
Combustion Optimal fuel-air-ratio SISO MFA
Galvanizing line

Application Sheet
Thickness Large time delays Anti-delay MFA
Product spec changes FF Trim MFA
Thickness inner-loop Wind-knife position or current (Nonlinear) Nonlinear MFA
Rolling mills

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Thickness High-speed, large Tau/T Ratio High-speed Anti-delay MFA
Product spec changes FF Trim MFA
Thickness inner-loop High-speed nonlinear High-speed Nonlinear MFA
Wastewater treatment

Application Sheet
pH Control Large gain changes in Log scale, large delay time MFA pH or Anti-delay MFA pH
De-sulfurization process

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Sulfuric acid concentration pH value High accuracy pH control MFA pH or Anti-delay MFA pH
Steel products

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Quality variables (Dimensions, surface temp, etc.) Large and varying time delays Anti-delay or Time-varying MFA
 
     
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