CO_2 ULTIMATE REDUCTION IN STEELMAKING PROCESS (COURSE50 PROJECT)

摘要

The target of COURSE50 is the mitigation of approximately 30% of CO_2 emissions in integrated steel plants. For this purpose, two technologies are investigated, which include a) Intensified hydrogen reduction in blast furnace and b) Separation and recovery of CO_2 from the blast furnace gas via chemical absorption and physical adsorption methods by the effective utilization of unused waste heat in steel works. Intensified hydrogen reduction must ensure the heat balance by decreasing the carbon direct reduction ratio, which is an endothermic reaction. To verify this concept, the experimental blast furnace is constructed in Kimitsu works, Nippon Steel & Sumitomo Metal Corporation. Main methods of decreasing the carbon direct reduction ratio are blast and raw material control. And reasonability of the results is affirmed by comparison between results of three dimensional mathmatical calculation model and actual results of experimental blast furnace.