基于高炉炉料结构优化的源头减排技术及应用

doi:10.13228/j.boyuan.issn0449-749x.20190287

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Abstract On the premise of achieving ultra-low pollutant emission,HBIS actively carries out research and development of source and process sulfur-nitrate emission reduction technology in order to further reduce the total pollutant emission. Aiming at the characteristics of domestic mineral powder resources and the law of pollutant generation in pellets and sintering process,the fluxed pellet with low-emission and low-energy,which is suitable for high ratio pellet smelting,was developed to reduce the total pollutant emission. The heat absorption and release law of fluxed pellet during the roasting process was clarified,the technical problems such as green ball bursting and rotary kiln ring formation were overcame,the magnesium fluxed pellet with mass percent of SiO₂ above 4.5%,mass percent of MgO about 1.8%,and binary alkalinity (R₂) around 1.0 was developed with long-term continuous production. The roasting temperature and pellet quality control,combustion temperature and sulfur-nitrate production control technology were developed,so that the compressive strength of fluxed pellet was more than 2 200 N,the SO₂ production amount was 20% lower than that of acidic pellet,and the SO₂ and NO_x were reduced by 75% and 53% respectively than that of sinter. The blast furnace smelting integrated technology of high proportion pellet was developed. And the proportion of blast furnace pellet was increased from 20% to 80%,the fuel ratio was decreased by 11 kg/t,and the SO₂ and NO_x emission of per ton iron was reduced by 50% and 26% respectively. Quantitative analysis method of energy saving and emission reduction during the iron-making life cycle and the continuous improvement direction were put forward,and the source and process pollutant reduction was realized. It has been successfully extended to the online 2 000 m³ blast furnace,3 000 m³ blast furnace and 3 000 m³ blast furnace in Laoting plant of HBIS Group. It opens up a new direction for reducing the total pollutant emission of domestic iron and steel industry.

Key words： blast furnace fluxed pellet source pollutant high proportion pellet

Received: 26 June 2019

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	WANG Xin-dong
	LI Jian-xin
	HU Qi-chen

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WANG Xin-dong,LI Jian-xin,HU Qi-chen. Application practice of source and process sulfur-nitrate reduction technology based on optimization of blast furnace charge structure[J]. Iron and Steel, 2019, 54(12): 104-110.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20190287 OR http://www.chinamet.cn/Jweb_gt/EN/Y2019/V54/I12/104

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