Aspen's RTO directing DMCplus on a crude unit

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: Does anyone have experience of running Aspen's RTO directing DMCplus on a crude unit. Has the RTO brought substantial additional benefits over just running DMCplus.

: The unit in question where this is being tried  is subject to substantial dynamic disturbance, including regular changes to feed stock, ongoing variation of injection streams from other units, and production changes to target cutpoints on product streams.  

: The RTO has been configured to write to a subset of the DMCplus independent and dependent variables, as recommneded by Aspen.  These external targets override (in an economic sense) the LP solution as derived by DMCplus.  While this is valid for units that run long periods of steady-state operation, it creates a significant liability for a dynamic process whose profitability is dependent on continually adjusting to, and then riding the most profitable constraints.

: To date the time taken to wait for steady state and then the exectution time of the reconciliation and optimisation means substantial opportunity is being lost when operating parameters change or disturbances hit the unit. It would be fair to say that running with RTO and DMCplus is less profitable than with just DMCplus at present.

: Has any one any experience of this type of set up and how best to set the system up to avoid these problems


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