MULTIOBJECTIVE PIG IRON COST OPTIMIZATION USING SIMPLEX PROJECTION

Pedro Gabriel da Silva Guimarães, Carlos Cristiano Hasenclever Borges, Wagner Antonio Arbex

Resumo


This work presents a multiobjective optimization model to support the assembly of the raw materials budget for blast furnaces consumption in the production of pig iron, the main material for steelmaking. Given a set of materials and fabrication constraints, such as materials availability, their chemical compositions, the required features for the final product, etc, the objective of the model is to determine the amount of each material that generates the lowest cost solution with minimum wasteful. Due to conflicting objectives, defined by fabrication cost and slag rate, and based on characteristics of decision variables that formulate the problem, some of them in percentage form, an evolutionary multi-objective model has been developed associated with a projection onto a simplex technique aiming to improve the encoding of the genetic solutions. This projection is used in the genetic algorithm-based evolutionary model, wherein each new generated individual, their genes with percentage values are projected onto a simplex, a Euclidean space where the sum of all variables is the unit. The projection allows an intrinsic strategy to deal with percentage constraint of the model variables, increasing significantly the number of feasible individuals generated by the evolutionary procedure. The model has shown to be very effective and useful in determining several scenarios to support decisions making for the raw materials budget.

Palavras-chave


Blast Furnace; Hot Metal; Multi-Objective Optimization; Genetic algorithm; Projection Onto Simplex

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DOI: http://dx.doi.org/10.21575/25254782rmetg2020vol5n61348

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Direitos autorais 2020 Pedro Guimarães, Carlos Hasenclever, Wagner Arbex

Revista Mundi Engenharia, Tecnologia e Gestão ISSN 2525-4782

Qualis: B4 - Interdisciplinar, B5 - Geografia, B5 - Administração Pública e de Empresas, Ciências Contábeis e Turismo, B5 - Comunicação e Informação, B5 - Engenharias III