Highly Efficient Use Technology of The By-Product Gas in Iron and Steel Making Process

Abstract

BOF gas, with an annual output of more than 100 billion standard cubic meters, is one of the primary by-product energy resources in the steelmaking process. However, the up to 34.7% abandoned rate of BOF gas in China has caused a lot of carbon emissions and energy resources waste. The abandoned BOF gas, with a high temperature of 1773∼1873K and 20∼40%(vol.%) CO and 20∼30%(vol.%) CO2 has a vast physical sensible heat and chemical latent heat. There are predictable recyclable values and comprehensive utilization prospects to achieve the ultra-low carbon emissions and energy conversion in ironmaking and steelmaking. The paper has carried out a detailed calculation of the energy value of abandoned BOF gas, and the feasibility analysis and program design of the overall resource recycling and energy utilization in ironmaking and steelmaking, including blast furnace smelting of vanadia-titania magnetite, combined blowing in BOF and vanadium-extracting converter, co-production of steel-chemicals industry.