Re: LPG constraint within an FCC DMC controller

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Comments:
: Graeme,
: I worked on an FCCU with a very similar problem.  They had a constraint
: in the LPG make off of the Debutanizer - a hydraulic limit in the 
: treaters downstream.  Quite similar.  They also originally had separate 
: Rxn/Rgn/MF & Gas Plant Controllers.  We combined the 2 controllers into a 
: single application, and it does run on the LPG constraint.  You are
: correct, all of the gains are not contained in the level on the gas plant
: feed drum, but this is not necessarily a problem you simply have to put in the
: proper models, and be sure they are consistent.  I think you are correct about
: trying to get the optimizer to set the proper targets - you will leave benefits
: on the table.  Too many things can change in between solutions 
: - that is unless you have enough room in the RVP target to simply
:  dump C4's into the bottom.  

: Hope this helps.
: Dan




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