Optimization of Energy Efficiency, Energy Consumption and Co 2 Emission in Typical Iron and Steel Manufacturing Process

Improving energy efficiency of the iron and steel manufacturing process (ISMP) plays a vital role in saving energy and reducing CO2 emissions. However, there is currently a lack of research on assessment method and improvement rules of energy efficiency of the ISMP. In addition, the impact of energy efficiency on CO2 emissions and energy consumption has rarely been mentioned in previous studies. To fill this gap, this study established an assessment and optimization model of energy efficiency, energy consumption and CO2 emissions in the ISMP. Combining material parameters, process parameters and reaction conditions as constraints, this study optimized typical ISMP with maximizing energy efficiency as the optimization goal, and further analyzed energy consumption and CO2 emissions of typical ISMP. After optimizing, energy efficiency of the ISMP is increased from 64.00% to 68.20%, energy consumption of the ISMP is reduced from 537.68 kgce/t-s to 419.95 kgce/t-s, and the CO2 emission of the ISMP is reduced from 1215.2 kg/t-s to 815.3 kg/t-s. It is found that injected coal ratio of blast furnace, charge structure of blast furnace, iron-steel interface and casting-rolling interface and so on have different effects on energy efficiency, energy consumption and CO2 emission of the ISMP