Blast furnace smelting method for digesting high-sulfur coke

Abstract

The invention relates to the technical field of molten iron smelting, in particular to a blast furnace smelting method for digesting high-sulfur coke. The method comprises the following steps that mineral aggregate loaded into a furnace top mineral aggregate receiving intermediate tank and fuel loaded into a furnace top fuel receiving intermediate tank are respectively added from the furnace top of a blast furnace, and then are smelted in the blast furnace to produce molten iron. According to the method, by limiting the use of mineral aggregate and combining the proportion and distribution mode of fuel, especially the distribution characteristics of high-sulfur coke, the high-sulfur coke is uniformly distributed on a middle ring belt of the material surface in the furnace and is in a convex ring shape, the inner side and the outer side of the middle ring belt are common coke, a large amount of air flow comes out from the center, the air flow is stable, the furnace condition fluctuation is avoided, the yield is stabilized, and the excessive sulfur content due to the application of the high-sulfur coke can be removed by the smelting process, so that the sulfur content of the produced molten iron does not exceed the standard, the percent of pass of the molten iron is guaranteed, the harmless consumption of the low-price high-sulfur coke in the blast furnace smelting is realized, and the economic benefit of an enterprise is improved.

Description

technical field [0001] The invention relates to the technical field of molten iron smelting, in particular to a blast furnace smelting method for digesting high-sulfur coke. Background technique [0002] The main fuel of blast furnace smelting is coke, but with the gradual shortage of coke resources, the price of high-quality coke is getting higher and higher, which has caused certain problems to the efficiency of enterprises. In order to improve the competitiveness of enterprises and expand the source of raw materials, high-sulfur coke has gradually become one of the raw materials and fuels for blast furnace smelting molten iron. High-sulfur coke is cost-effective, but it will cause the following unfavorable situations in blast furnace smelting: the furnace condition is easy to fluctuate and the output is reduced; the sulfur in the molten iron is easy to exceed the standard, and the number of extra iron increases; the blast furnace hearth and furnace wall are damaged, which...

AI Technical Summary

Problems solved by technology

High-sulfur coke is cost-effective, but it will cause the following unfavorable situations in blast furnace smelting: the furnace condition is easy to fluctuate, and the output decreases;

In addition, according to the traditional process, high-sulfur coke is spread over the entire material surface. When the gas flow rises from the edge, it is fully mixed with the high-sulfur coke at the edge, and the temperature is high, resulting in corrosive airflow, which scours the furnace wall and erodes the furnace wall. The life of the furnace shaft is shortened; and it will cause uneven circumference of the furnace wall, unstable airflow at the edge of the blast furnace, causing fluctuations in the blast furnace condition, and thus a decrease in output

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