Sulfur flow analysis for new generation steel manufacturing process

Abstract

Sulfur flow for new generation steel manufacturing process is analyzed by the method of material flow analysis, and measures for SO₂ emission reduction are put forward as assessment and target intervention of the results. The results of sulfur flow analysis indicate that 90% of sulfur comes from fuels. Sulfur finally discharges from the steel manufacturing route in various steps, and the main point is BF and BOF slag desulfurization. In sintering process, the sulfur is removed by gasification, and sintering process is the main source of SO₂ emission. The sulfur content of coke oven gas (COG) is an important factor affecting SO₂ emission. Therefore, SO₂ emission reduction should be started from the optimization and integration of steel manufacturing route, sulfur burden should be reduced through energy saving and consumption reduction, and the sulfur content of fuel should be controlled. At the same time, BF and BOF slag desulfurization should be optimized further and coke oven gas and sintering exhausted gas desulfurization should be adopted for SO₂ emission reduction and reuse of resource, to achieve harmonic coordination of economic, social, and environmental effects for sustainable development.