An energy intensity optimization model for production system in iron and steel industry

To optimize iron and steel production for the goal of energy intensity reduction, this paper systematically analyzed the flow characteristics of ferrite-flows and established an energy intensity production optimization model for production system in iron and steel industry. Production optimization model was calculated for a certain iron and steel company under five different ferrite-flows characters and structures. The results indicated that with the same product order, the energy intensity of the five optimized production schemes are decreased from the original scheme by 0.6%, 1.6%, 1.2%, 0.7% and 2.9%; calculated according to the crude steel production of the company in a month (October 2012, 1128 Kilo metric tons), energy saving of 4399 tce (ton coal equivalent), 111,505 tce, 8798 tce, 4963 tce and 20,980 tce, respectively, can be achieved. Through comparative analysis of the productions of various units under different schemes, it is discovered that the production optimization of the Ironmaking stage is the key and that the energy saving margin in optimized production of Steel-Rolling stage is limited. And then the energy saving technologies and measures, which favors production route re-optimizes, should be adopted in actual production process. In addition, the energy intensity reduces by 1.2 kgce/t, 0.4 kgce/t and 0.05 kgce/t while 1% increases of sinter ore grade, scrap and lump ore usage, respectively.