July 2003

Instrumentation/Plant Optimization

Crude oil blend scheduling optimization: an application with multimillion dollar benefits – Part 2

The ability to schedule the crude oil blendshop more effectively provides substantial downstream benefits

Manley, F., Emerson Process Management; Kelley, A., FS-Elliott

To facilitate more specific information on the formulation we must first talk about the problem variables. These can be classed into continuous and combinatorial variables. Continuous variables are the quantity and quality variables, and the combinatorial variables are the logic or discrete variables. There are also auxiliary or intermediate variables such as startup (and shutdown or switchover) and flow times yield variables that are used to support solving both the logistics and quality subproblems. Bounds and constraints associated with these variables follow. Quantity details (hydraulic capacities). There are essentially three types of hydraulically related quantity bounds: flowrate, f

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