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

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Hannu Helle, Mikko Helle, Frank Pettersson, Henrik Saxén
Publisher: IRON STEEL INST JAPAN KEIDANREN KAIKAN
Publication year: 2010
Journal: Isij International
Journal acronym: ISIJ INT
Volume number: 50
Issue number: 10
Start page: 1380
End page: 1387
Number of pages: 8
ISSN: 0915-1559
eISSN: 1347-5460


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.


Keywords

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

Last updated on 2019-19-08 at 07:15