| Operating
Unit / Process |
What
to Control |
Why
Is It Difficult |
Which
MFA to Use |
Steam Generators or Boilers
Application
Sheet |
Steam temp and pressure |
Large steam load changes |
Robust MFA |
| Steam drum level |
Inverse-action |
3-Element Anti-delay + FF MFA |
| Combustion |
Fuel type changes result in combustion efficiency changes |
SISO MFA |
Evaporators for
black liquid recovery
Request
white paper |
Density |
Interaction to level |
MIMO MFA |
| Level |
Interaction to density |
MIMO MFA |
Pulp production
Request
white paper |
Consistency |
Interaction to level |
MIMO MFA |
| Level |
Interaction to consistency |
MIMO MFA |
Rotary kilns (Calcinier)
Application
Sheet
|
Outlet temperature |
Large time delays |
Anti-delay MFA |
| Large load changes |
Feedforward MFA |
| Combustion |
Optimal fuel-air-ratio |
SISO MFA |
Paper machine
Request
white paper |
Quality variables (thickness, basis weight,
etc.) |
Large time delays |
Anti-delay MFA |
| Product spec changes |
FF Trim MFA |
Wastewater treatment
Application
Sheet
|
pH control |
Large gain changes in Log scale, large delay time |
MFA pH or Anti-delay MFA pH |
Dryers
Request
white paper |
Moisture |
Large time delays |
Anti-delay MFA |
| Temperature |
Large load changes |
FB/FF MFA |
Paper dying process
Request
white paper |
Paper color |
A combined control and optimization problem |
Anti-inverse MFA |
| pH inner loop |
High accuracy pH control |
MFA pH |
