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Food Processing
 
     
 
Operating Unit / Process What to Control Why Is It Difficult Which MFA to Use
Evaporators

Application Sheet
Article
Density Interacts with level MIMO MFA or FB/FF MFA
Level Interacts with density MIMO MFA or FB/FF MFA
Ovens and Dryers

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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
Extruders

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Density or moisture Large time delays Anti-delay MFA
Temperature Time-varying SISO MFA
Pressure Nonlinear SISO MFA
Wastewater treatment

Application Sheet
pH Control Large gain changes in Log scale, large delay time MFA pH or Anti-delay MFA pH
Food acid concentration pH Control High accuracy pH control MFA pH or Anti-delay MFA pH
Tomato hotbreaks

Application Sheet
Temperature Large feed variations SISO MFA
Sterilization / steam injection Temperature Large load changes SISO MFA
Food products Quality variables (Density, moisture, surface temp, etc.) Large time delays Anti-delay MFA
Heat-exchangers

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Temperature Interactions among temperature points MIMO MFA or FD/FF MFA
Cooling towers

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Levels and flows Multivariable MIMO MFA or Balanced MFA
Cooling tunnels Surface temperature Large time delays Anti-delay MFA
Zone temperature Multiple zones MIMO MFA
Steam boilers

Application Sheet
Steam temp and pressure Large load changes Robust MFA
Steam drum level Inverse-action 3-Element Anti-delay + FF MFA
Combustion Optimal fuel-air-ratio SISO MFA
 
     
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