High Purity Tower DMC control - effect of operating state variation on controller performance

Posted by S. R. Naidu on November 22, 1999 at 01:19:56:

I am faced with a poorly performing DMC controller on a propylene / propane splitter. The operations group is currently running the unit with 30-40% less feed than original plant test condition. Due to the significant model mismatch, DMC controller has been turned off & the system is under regulatory control. Management wants to get back to DMC control with nontrivial fix / modeification that will assure reliable multivariable control over widely ranging operating conditions. Any ideas or suggestions will be welcome. Should I develop models befitting varying operating regions & then program the controller to choose the models pertinent to the active operating reion ?
Is it possible to configure the CCF to work with a collection of models - choose appropriate model & switch to another if necessary seamlessly ?

Follow Ups:

• Re: High Purity Tower DMC control - effect of operating state variation on controller performance Don Snowden 13:19:36 11/29/99 (2)
  • Re: High Purity Tower DMC control - effect of operating state variation on controller performance Naidu 13:53:36 11/30/99 (1)
    • Re: High Purity Tower DMC control - effect of operating state variation on controller performance Don Snowden 20:57:04 12/02/99 (0)
• Re: High Purity Tower DMC control - effect of operating state variation on controller performance Brian Burgio 21:15:58 11/22/99 (0)

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: I am faced with a poorly performing DMC controller on a propylene / propane splitter. The operations group is currently running the unit with 30-40% less feed than original plant test condition. Due to the significant model mismatch, DMC controller has been turned off & the system is under regulatory control. Management wants to get back to DMC control with nontrivial fix / modeification that will assure reliable multivariable control over widely ranging operating conditions. Any ideas or suggestions will be welcome. Should I develop models befitting varying operating regions & then program the controller to choose the models pertinent to the active operating reion ?
: Is it possible to configure the CCF to work with a collection of models - choose appropriate model & switch to another if necessary seamlessly ? 


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