Energy Saving Bottleneck Analysis in Iron and Steel Plant Based on Decomposition Model of Energy Consumption Index

This paper applied the decomposition model of energy consumption index on the four-grade structure, from main-process stream to equipment, of a Chinese iron and steel plant (here after refers to plant A). Based on the data of energy consumption of plant A of resent years, the change of energy consumption per ton steel was decomposed into production factor and energy intensity factor, to analyze the two factors´ influence on the total index. The model analysis showed that, the production structure of 1750m³ blast furnaces was the bottleneck of energy saving. Thus decreasing steel-iron ratio will be most effective to reduce the energy consumption of plant A. The further analysis shows that the energy consumption per ton steel would be decreased by 35kgce/t if the steel-iron ratio reduced from 0.98 to 0.90.