Optimization of Ironmaking Process for Reducing CO2 Emissions in the Integrated Steel Works

Abstract

Global warming is a common subject in steel industry in every country. International cooperation will be required using the Kyoto. Mechanism from global aspect. In the integrated steel works, there are various means to decrease reducing agent at blast furnace, however, preferable way to reduce CO 2 emissions must be chosen considering energy balance in whole steel works, and energy saving must be actively pursued. Injection of waste plastics and carbon neutral materials such as biomass is better alternative. In the near future, hydrogen will attract attention as a clean energy source even in the steel works. Regarding oxygen blast furnace and smelting reduction, the possibility of CO 2 reduction is dependent on optimum system design of total process including outside process. Charge of prereduced sinter and high reactivity coke to blast furnace leads to reduction of CO 2 , keeping current blast furnace facility and capability.