Air consumption and waste gas emission of steel industry
CAI Jiu-ju1，2
（1. State Environmental Protection Key Laboratory of Eco-Industry， Northeastern University， Shenyang 110819，Liaoning， China； 2. Energy and Thermal Engineering Branch， The Chinese Society for Metals， Shenyang 110819，Liaoning， China）
Abstract：By investigating the material metabolism between industrial system and the environment，the air was regarded as a resource for metallurgy，and the relationship among air consumption，waste gas production，polluted materials emission and the ambient air quality was established. Based on the survey of steel plants，the air consumptions and waste gas emissions of BF-BOF route，including sintering，coking，iron-making，steel-making and steel rolling，were obtained and compared with EAF route. The shares of materials consumption and waste gas emission of Chinese steel industry were calculated on a ton-of-steel basis. It is shown that air consumption contributes more than 85% of the mass of materials consumption. Thus，it is reducing the air consumption and waste gas emission that is of great significance to the reduction of polluted materials and improvement of air quality. The emission-reducing scenarios，such as oxygen-enriched or pure oxygen combustion，waste gas recycle and reuse，and vertical-type sintering ore waste heat recovery were investigated. It is pointed out that these operative technologies，as well as optimizing steel manufacturing process and developing EAF-route，are effective to reduce air consumption and the resulted reduction of particulate matters，SO2 and NOx emissions.
蔡九菊. 钢铁工业的空气消耗与废气排放[J]. 钢铁, 2019, 54(4): 1-11.
CAI Jiu-ju. Air consumption and waste gas emission of steel industry[J]. Iron and Steel, 2019, 54(4): 1-11.
