Blast furnace coal powder injection combustion adjuvant and application method thereof

Abstract

The invention discloses a blast furnace coal powder injection combustion adjuvant and an application method thereof. The combustion adjuvant is a powdery mixture, and is composed of, by mass: 50-80% iron oxide red, 0-20% of rare earth oxide, 0-20% CaO, 0-20% of MgO, 0-30% of manganese-series oxide, and balance of impurities. According to the invention, the coal powder is injected into a blast furnace raceway by using a coal gun according to a formula that: AP=Vad / 16.99-(FCad-62.17%) / 18.16+(T-817.15)*100% / 609.45+(CSR-55.52%) / 24.14+OEB / 5.27. According to the invention, on a basis that a coal injection effect is ensured, iron oxide red can be more effectively recovered and utilized, such that enterprise by-products can be recycled, outsourcing cost can be reduced, and enterprise operation cost reduction can be finally realized. With the combustion adjuvant and the method, a novel approach is developed for blast furnace energy saving and emission reducing.

Description

technical field [0001] The invention belongs to the technical field of ironmaking in the iron and steel industry. In particular, it relates to a combustion accelerant for pulverized coal injection in a blast furnace and a use method thereof. Background technique [0002] As one of the means to improve blast furnace smelting conditions and reduce costs, pulverized coal injection has attracted more and more attention from metallurgical workers, and the key to the effect of pulverized coal injection is to strengthen the combustion of pulverized coal in the tuyere swirl area, especially for lifting The combustion rate of pulverized coal has become an urgent need for blast furnace production. At present, at home and abroad, certain researches have been carried out on changing the combustion rate of pulverized coal, such as the use of combustion accelerants, oxygen enrichment, high wind temperature, the addition of pulverized coal with high combustion performance, or the use of f...

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Problems solved by technology

However, since iron red itself is a by-product of recycling waste acid in the cold rolling pickling process, there are certain differences in chemical composition from concentrate or fine ore, especially SiO 2 The content of CaO and CaO is low, and its assimilation performance, liquid phase flow performance, binder phase strength and other performance indicators are not as good as those of iron concentrate and fine ore, resulting in the liquid phase produced during the roasting process of sinter and pellets in actual production. Insufficient amount and poor strength lead to the deterioration of the quality of finished ore, which cannot improve the quality of sintering and pellets. Moreover, because iron red also belongs to the category of extremely fine dust, Anshan Iron and Steel Technology Center has carried out "Anshan Iron and Steel Dust Utilization During this period, we learned from statistical data that about 60% to 70% of the fine metallurgical dust will circulate in the entire metallurgical production system after returning to sintering and pelletizing for re-agglomeration. to full use

Therefore, it is not scientific enough to use the method of "returning to sintering and re-forming pellets"

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