AN INTEGRATING MODEL FOR THE ACQUISITION AND USE OF METALLURGICAL COALS IN STEELWORKS

AUTOR(ES)

João Paulo Soares de Barros

DATA DE PUBLICAÇÃO

1995

RESUMO

The coal supply to steelworks is usually seen as presenting two distinct but related problems: (i) how to determine the amounts of different types of coals to buy from the available suppliers, typically planned ahead for a year and (ii) the operational problem of using the coals available in the stockyards on a daily and weekly basis. The supply model developed in this research can support both the long term acquisitions as well as the routine blend scheduling. Some large steelworks have contributed to this research by providing data, technical information and a partial grant. The research has produced a model, and a computer-aided system to run it, that integrates these two problems and finds the optimal solution for the integrated purchase. Thus, the day-to-day operational problems are taken into account in determining the annual purchase plan in order to minimise costs. Some of the problems examined are those that impose limitations on the number of coals that can go into a blend at any time, on the length of time required to operate a blend continuously and on the number of changes in coal types from one blend to the next. These are combined with further technical and logistic constraints. The support system allows inputting selected strategic and operational parameters. It can be used to explore the trade-off between the number of coal suppliers and annual costs. It also addresses re-scheduling needs arising from failures in the delivery of coals previously assigned to scheduled blends. A moving safety stock acts as a safeguard against occasional failures thereby smoothing out operational disruptions that could otherwise arise. Safeguard stocks may improve the ratio between the amount of coals in stock that form feasible blends and the total amount of coals being carried in inventory.

ASSUNTO(S)

steel production coke engenharia de producao coal blend

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