1. Decomposition Techniques for the Real-time Optimization of a Propylene Production Unit
- Author
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A.M. Acevedo P., J.E.A. Graciano, Fabio D.S. Liporace, A.S. Vianna, and Galo A C. Le Roux
- Subjects
Mathematical optimization ,symbols.namesake ,Engineering ,Lagrangian relaxation ,business.industry ,Production unit ,Decomposition (computer science) ,symbols ,Common value auction ,Process optimization ,Relaxation algorithm ,business ,Refinery - Abstract
In this work an application of decomposition techniques on a propylene production unit from REPLAN refinery by Petrobras S.A. is presented. It is shown that the classic Lagrangian Relaxation (LR) technique and the alternative technique called “Pricing Interprocess Streams Using Slack Auctions” (PISUSA) do not converge for the case study presented. The issues involved in each decomposition approach are identified and discussed; then a modification of the Lagrangean Relaxation algorithm is proposed using a new constraint-updating rule. This modified algorithm is able to overcome the issues and solve the decomposed problem properly.
- Published
- 2015
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