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Process integration in connection to an integrated steel plant M Larsson, J Dahl

Schematic figure of an integrated steel plant. The major processes from the left: Coke oven, Blast furnace, BOF converter, alloying process and slab casters Source: SSAB Tunnplåt AB. Process integration in connection to an integrated steel plant M Larsson, J Dahl

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Process integration in connection to an integrated steel plant M Larsson, J Dahl

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  1. Schematic figure of an integrated steel plant. The major processes from the left: Coke oven, Blast furnace, BOF converter,alloying process and slab casters Source: SSAB Tunnplåt AB Process integration in connection to an integrated steel plant M Larsson, J Dahl Division of Energy Engineering Industrial systems, such as an integrated steel plant, involve large interchange of energy between various processes and process streams. A major task for the steel industry is to minimize environmental impact, the consumption of energy and raw materials. A natural step is to improve the behavior of the individual processes. However, since the processes within the steel plant system are connected to each other, energy savings in one individual unit does not necessarily lead to an energy saving for the total system. According to the Swedish National Energy Administrationand Statistics, the steel industry used approximately 17 % of all industry related energy use the year 2000. Thus will small efficiency changes for the steel industry result in large absolute energy savings. But in order to make a successful energy saving one must understand the interactions between different processes. Methods are needed to optimize the consumption of energy and raw materials for the total system. These techniques can be defined as Process integration methods. The Division of Energy Engineering at Luleå University of Technology are presently working in close co-operation with the steel industry (SSAB Tunnplåt) with process integration for the steel industry. In the project a total optimisation model for the steel industry system is developed. The method can be used to analyse and improve the energy efficiency, the total system economy. The method will be a mean in order to find the total system optimum, a guide to analyse the influence of external conditions and also the effect on the surrounding. The research is funded by the Swedish National Energy Administration

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