June 2006

Special Report: Process/Plant Optimization

Logistics: the missing link in blend scheduling optimization

Incorporating them can yield significant improvements in efficiency and productivity

Kelly, J. D., Honeywell Process Solutions

Blending liquids of diverse quality, as defined by their composition and properties, to obtain mixtures more consistent in quality and meet specific quality requirements is well-known in the hydrocarbon processing industries (HPI), especially for crude oil, naphtha, gasoline and diesel blends. This article describes a less familiar dimension of blending known as "logistics" scheduling optimization1,2 and emphasizes the importance of not just meeting quality but also respecting as much as possible the many, sometimes hidden logistical elements of blending. Logistics deals with the quantity and logic details of the blendshop optimization problem. It provides the needed "coarse-tune" for the

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