Otimização do posicionamento de componentes no layout de plantas quimicas

AUTOR(ES)

Lucilene Beatriz Pissinatto

DATA DE PUBLICAÇÃO

2001

RESUMO

The adequate development of the layout of a chemical plant is very important because of economic, operational and safety reasons. The overall optimization of the plant must inc1ude the optimization of the placement of the components and the length and distribution of the pipes, satisfying safety constraints. The objective of this work was the development of more efficient mathematical models to accomplish the optimization of the placement of the components of the layout of chemical plants, through the formulation of the problem as mixed integer linear programming (MILP), solved with the aid of a commercial optimization package, GAMS/CPLEX. A more efficient model implies in smaller time of calculation and satisfactory results. To test the models, three case studies were proposed, with different numbers of components: a petrochemical unit (6 components); a suspension polymerization plant (7 components) and a recovery of mercury from the effluents of electrolytic plant (9 components). The computational time to solve each case is intimately linked to the number of components, in other words, as larger the number, so much larger the time spent for its resolution. The tested models showed mixed results, that is, with the addition of some logical constraints or substitution of other constraints related to the nozz1es and pipes, the computational time decreased for the petrochemical unit and for the plant of mercury recovery, but the original model (existent in the literature) presented better results for the suspension polymerization plant. Therefore, it was verified that the proposed models are better in some situations, but not in others, depending on the case study and of the involved conditions (number of variables, number of iterations and nodes inspected by the algorithm B&B, etc.)

ASSUNTO(S)

otimização matematica modelos matematicos layout

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