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Power & Utilities
 
     
 
Operating Unit / Process What to Control Why Is It Difficult Which MFA to Use
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
Co-generation plants

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Generator speed Coordinated control (DEH) MIMO MFA
Steam extraction Multivariable (DEH) MIMO MFA
Fluidized bed boilers

Application Sheet
Steam pressure Nonlinear Nonlinear MFA
Steam temperature Large time delay and time-varying Anti-delay MFA or Time-varying MFA
Combustion Optimal fuel-air-ratio SISO MFA
Steam drum level Inverse-action 3-Element Anti-delay + FF MFA
Boiler water

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Hardness Large time delays Anti-delay MFA
pH control pH and large time delays Anti-delay MFA pH
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 pH Control High accuracy pH control MFA pH or Anti-delay MFA pH
Hydro plants Gate level Water level protection Robust MFA
Coal ball milling

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Speed and efficiency A combined control and optimization problem Anti-inverse MFA and SISO MFA

Selective catalytic reduction (SCR)

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Ammonia level for NOx reduction Large and varying time delays Anti-delay or Time-varying MFA
 
     
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