Analysis of nitrogen flow in the whole process of a typical iron and steel enterprise and reduction potentialof nitrogen-containing pollutants
TIAN Guo1,2, GAO Cheng-kang1,2, ZHANG Xi-xi1,2, LI Xiao-jun3
1. State Environment Protection Key Laboratory of Eco-Industry,Northeastern University,Shenyang 110819, Liaoning, China; 2. School of Metallurgy,Northeastern University,Shenyang 110819, Liaoning, China; 3. Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China
Abstract：Aiming at the environmental pollution caused by NOx generated in the whole process of steel production, based on the NOx generation mechanism and substance flow analysis method, an analysis model of nitrogen flow in the whole process of steel production was established. Using this model, based on the actual production data of a typical iron and steel enterprise, the nitrogen flow characteristics of the iron and steel complex were analyzed, and the production, denitrification and emission of nitrogen-containing pollutants and exhaust gas NOx discharged in the whole process of iron and steel production were discussed, which could provide a theoretical basis for further research on NOx emission reduction in iron and steel industry. The results show that the main source of nitrogen input by iron and steel enterprise is the blast furnace blast and the air required for combustion in each process (99.655%), the output of nitrogen is mainly discharged into the atmosphere in the form of N2 (82.917%), and the nitrogen in the whole process is mainly circulated in the form of gas and process products. The nitrogen-containing pollutants emitted by iron and steel enterprises are mainly NOx(97.982%), and the NOx emissions from the blast furnace ironmaking process are the highest. The exhaust NOx produced by iron and steel enterprises mainly comes from coke (56.84%) and coal (28.91%), of which 24.23% of NOx is converted into N2 after denitrification and discharged into the atmosphere. Researching on nitrogen element flow and nitrogen-containing pollutants emission, control and related policies in the whole process of iron and steel production, and putting forward reasonable suggestions are of great significance to China's environmental protection and the green development of the iron and steel industry.
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2022, Vol. 32 
