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

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    Sammanfattning

    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.
    OriginalspråkOdefinierat/okänt
    Sidor (från-till)1380–1387
    Antal sidor8
    TidskriftIsij International
    Volym50
    Utgåva10
    StatusPublicerad - 2010
    MoE-publikationstypA1 Tidskriftsartikel-refererad

    Nyckelord

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

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