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Method for smelting scrap steel through blast furnace oxygen-enriched large-proportion bituminous coal injection

A large-scale, blast furnace technology, applied in the metallurgical field, can solve the problems of poor system stability, high volatile content of bituminous coal, and reduce costs, and achieve the effects of reducing coke ratio, increasing coal injection volume, and increasing output.

Active Publication Date: 2022-07-01
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, due to the high volatile content of bituminous coal, there are potential safety hazards such as spontaneous combustion, fire, and explosion. When the content of bituminous coal in the injection coal increases, the stability of the blast furnace smelting system becomes poor. Therefore, bituminous coal injection to reduce costs is limited.

Method used

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  • Method for smelting scrap steel through blast furnace oxygen-enriched large-proportion bituminous coal injection
  • Method for smelting scrap steel through blast furnace oxygen-enriched large-proportion bituminous coal injection
  • Method for smelting scrap steel through blast furnace oxygen-enriched large-proportion bituminous coal injection

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A blast furnace (3222m 3 ),

[0046] Table 1 A blast furnace charge composition parameters

[0047]

[0048] Table 2 A blast furnace using South African block chemical composition

[0049]

[0050] Table 3 A blast furnace pulverized coal injection technical parameters

[0051]

[0052]

[0053] (1) All charging materials for blast furnace A are: large-size sintered ore, small-size sintered ore, Ezhou pellets, South African lumps, coke and scrap steel with crushed material type; the conventional ore batch is 92t for blast furnace, and specific scrap steel is charged The amount is 2.7t;

[0054] (2) A blast furnace injection coal is a mixture of bituminous coal and anthracite, the anthracite is Yongcheng anthracite and Jincheng anthracite, the bituminous coal is Shenhua bituminous coal, and the mass percentage of Shenhua bituminous coal is 42%;

[0055] (3) The standard air volume of blast furnace A is 6222m 3 / min, the oxygen enrichment rate is 8%, and t...

Embodiment 2

[0059] B blast furnace of a domestic ironworks (3222m 3 ),

[0060] Table 4 B blast furnace charge composition parameters

[0061]

[0062] Table 5 The chemical composition of Aussie block used in B blast furnace

[0063]

[0064] Table 6 B blast furnace pulverized coal injection technical parameters

[0065] coal type M t / ％

A ad / ％

V daf / ％

S tad / ％

Proportion / % Handan Anthracite 11.4 11.52 11.55 2.55 42.5 Jincheng Anthracite 8.76 12.69 9.45 2.42 12.5 Lu'an Bituminous Coal 16.3 6.52 28.22 2.35 45.2

[0066] (1) All the charging materials for B blast furnace are: large particle size sinter, small particle size sinter, Ezhou pellet, Australian block, coke and scrap steel with crushed material type; the blast furnace adopts the conventional ore batch of 86t, and the specific scrap is loaded into The amount is 4.3t;

[0067] (2) B blast furnace injection coal is a mixture of bituminous coal and anthracite, the an...

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Abstract

The invention discloses a method for smelting waste steel by blast furnace oxygen-enriched large-proportion bituminous coal injection, which comprises the following steps: charging: all charging materials of a blast furnace comprise sintered ore, pellet ore, lump ore, coke and waste steel, adding the waste steel at the edge ring belt of the blast furnace according to the mass ratio of the waste steel consumption to the ore batch weight in each batch of charging materials of (3-5): 22, and charging into the furnace for smelting; material distribution: the ore-coke ratio at the edge of a furnace wall is 4: 3 or 3: 2, and the mass percent of the central coke adding amount is 29.4-33.3% of that of a coke batch; blowing: blowing coal is mixed coal of anthracite and bituminous coal, and the mass percentage of the bituminous coal is 42-45%; air blowing: the adopted air blowing oxygen enrichment rate is 8-12%, and the standard air speed (standard air volume / air inlet area) is 252-272 m / s; by improving the blast oxygen enrichment rate of the blast furnace, using high-volatile bituminous coal for injection in a large proportion, adding waste steel into the furnace, adjusting the material distribution system, strengthening the central gas flow of the blast furnace and inhibiting the edge gas flow, the stable furnace condition, low consumption and high yield of the blast furnace are realized.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for smelting scrap steel. Background technique [0002] Due to the country's increasingly strict environmental protection requirements, coupled with the constraints of factors such as the regulation of the metallurgical industry, at present, iron and steel enterprises will not be able to add new process equipment, but at the same time, with the rapid development of my country's economy, for different purposes The demand for iron and steel products is also increasing day by day. In order to meet the rapid growth of iron and steel products in different industries, iron and steel enterprises need to use existing equipment conditions to fully tap their own capabilities to meet the growing market demand. As for the ironmaking process, the increase in production capacity means that the production capacity must increase under the condition that a new blast furnace...

Claims

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Application Information

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IPC IPC(8): C21B5/00
CPCC21B5/008C21B5/003Y02P10/20
Inventor 李红夏秋雨郑华伟于刚肖志新胡正刚刘栋梁陈令坤
Owner 武汉钢铁有限公司
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