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Blast furnace coal powder injection combustion adjuvant and application method thereof

A combustion aid and pulverized coal technology, which is applied in the field of ironmaking in the iron and steel industry, can solve the problem of performance indicators such as assimilation performance, liquid phase fluidity performance, binder phase strength, etc. Insufficient phasor and other problems, to achieve the effect of reducing the content of unburned coal powder, reducing the cost of outsourcing, and improving the combustion of pulverized coal

Active Publication Date: 2013-02-20
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
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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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  • Blast furnace coal powder injection combustion adjuvant and application method thereof
  • Blast furnace coal powder injection combustion adjuvant and application method thereof

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Embodiment Construction

[0027] The present invention is described in detail below in conjunction with specific embodiment:

[0028] A combustion aid for pulverized coal injection in a blast furnace: a powder mixture: the mixture consists of 50% to 80% iron red, 0% to 20% rare earth oxide, 0% to 20% CaO, 0% to 20% MgO, 0% to 30% manganese oxides, and others are impurities.

[0029] Fe in iron red of the present invention 2 o 3 The content is greater than 90%, the gangue content ranges from 0.2 to 10%, and the iron red particle size <0.071mm accounts for more than 50% of the total iron red mass percentage.

[0030] The using method of the combustion accelerant of blast furnace injection pulverized coal of the present invention is:

[0031] Put the combustion improver on the upper part of the pulverized coal of the main coal belt, grind the pulverized coal through a medium-speed mill to mix them evenly, and then fluidize them through the injection tank, and spray the pulverized coal and the combustio...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L9/12
Inventor 张立国张伟王再义任伟江治飞王相力邓伟郭天永
Owner ANGANG STEEL CO LTD
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