Direct Reduction Iron (DRI) Processes
Heat recovery systems for integrated reformers
In direct reduction processes iron oxide is reduced to iron.
Reduction takes place in the shaft furnace at temperatures below the melting point of the solid material. The resulting product named Direct Reduced Iron has a high content of metallic iron (> 90 %) and of carbon (2 – 3 %). Being used as raw material for steel making in the Electric Arc Furnace (EAF), DRI is gaining increasing prominence as feedstock for EAFs in high quality steelmaking.
If the cooling zone in the furnace is eliminated the DRI can immediately be briquetted into Hot Briquetted Iron (HBI).
The benefits of DRI are significant. As low cost natural gas is widely available, steel can be produced at favourable prices. The use of DRI in steelmaking greatly reduces carbon emissions, increases capacity and improves the quality of the steel product. All these factors lead to a high economic efficiency of the DRI plant.
Furthermore, shale gas development is giving access to globally competitive priced natural gas for the foreseeable future. Thus great advantage can be taken from the shale gas effect.
Integrated engery utilization
In order to determine the most feasible solution for increasing the energy efficiency, an integrated understanding of the production processes of the entire value chain of steel production is required.
For the integrated iron and steel making route the interplay of waste energy utilization with process energy demand has to be considered. Potential energy sources have to be combined with possible users within the steel plant, in order to elaborate an integrated energy concept.
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