This prestudy is the first project of two where the overal aim is to develop techniques for process integration in the steel industry. This industry consumes a lot of energy and a tool for integration is of great importance for process optimazion and energy conservation in steel plants. This projekt involvs first an investigation of what kind of tool the Swedish steel industry needs for process integration (energy conservation, enviromental aspects). The second part contains data recording of relevant process parameters connected to the blast furnace at SSAB Luleå. The third part is a theoretical study of transient process parameters and how they affects the plant and surounding industries such as power plant Lulekraft.