| 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.)
Request
white paper |
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
Request
white paper |
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
Request
white paper |
Sulfuric acid concentration pH value |
High accuracy pH control |
MFA pH or Anti-delay MFA pH |
Steel products
Request
white paper |
Quality variables (Dimensions, surface temp, etc.) |
Large and varying time delays |
Anti-delay or Time-varying MFA |
