Multi-objective optimization of ironmaking in the blast furnace with top gas recycling

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    Abstract

    Concern about the growing carbon dioxide content in the atmosphere has induced increasing research activities in the search for means to suppress the emissions of CO(2) in primary steelmaking. Blast furnace top gas recycling, combined with CO(2) stripping, has been proposed as a promising concept. The paper presents a numerical analysis of top gas recycling under massive oxygen enrichment of the blast based on a simulation of the process chain from coal and ore to liquid steel. Because of the conflicting goals of reducing both production costs and emissions, the task is formulated as a multi-objective optimization problem. The optimal states of the system studied were found to vary significantly on the Pareto frontier, which demonstrates that fundamentally different states of operation may be selected to strongly reduce the emissions, still keeping the steelmaking economically feasible. The findings stress the importance of selecting a proper state of operation for achieving a cost-efficient production of steel with reduced environmental impact. The results also show how emissions can be "artificially" reduced by minimizing the arising emissions within the system boundary.
    Original languageUndefined/Unknown
    Pages (from-to)1380–1387
    Number of pages8
    JournalIsij International
    Volume50
    Issue number10
    Publication statusPublished - 2010
    MoE publication typeA1 Journal article-refereed

    Keywords

    • CO(2) emissions
    • multi-objective optimization
    • sustainable steelmaking
    • top gas recycling

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