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Method for producing sponge iron by rotary hearth furnace

A technology of sponge iron and rotary hearth furnace, applied in the direction of furnace, furnace type, fluidized bed furnace, etc., to achieve the effect of improving recovery efficiency, reducing the amount of combustion air, and reducing heat loss

Inactive Publication Date: 2011-06-08
CHINA JINGYE ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] There is no report on the production of sponge iron by oxygen-enriched combustion technology in rotary hearth furnace

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In the rotary hearth furnace for the production of sponge iron, the usual production raw materials are used. In the production process, the oxygen-enriched combustion technology is used for the primary combustion air, so that the oxygen enrichment rate is 30%. The combustion air volume is reduced by 15%, the smoke emission is reduced by 13%, and the exhaust heat loss will be reduced by 13%, thereby reducing fuel consumption.

Embodiment 2

[0020] In the rotary hearth furnace for the production of sponge iron, the iron-containing and zinc-containing dust recovered from the iron and steel plant is used as the production raw material. During the production process, the oxygen-enriched combustion technology is used for the secondary combustion air to make the oxygen-enriched rate 29%. The amount of combustion air is reduced by 13%, and the smoke emission is reduced by 11%, thereby reducing the heat loss of exhaust smoke and reducing fuel consumption.

Embodiment 3

[0022] In the rotary hearth furnace for the production of sponge iron, the iron-containing and zinc-containing dust recovered from the iron and steel plant is used as the raw material for production. In the production process, the oxygen-enriched combustion technology is used for the primary combustion air, so that the oxygen enrichment rate is 32%; the secondary Oxygen-enriched combustion technology is also used in the combustion-supporting air, so that the oxygen-enriched rate is 32%. The amount of combustion-supporting air is reduced by 38%, the amount of flue gas emission is reduced by 32%, the heat loss of smoke exhaust is reduced by 30%, and the fuel consumption is reduced. The capacity of subsequent useful dust recovery equipment such as zinc in flue gas can be reduced by one-third, which not only reduces investment, but also reduces equipment operating costs accordingly.

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Abstract

The invention provides a method for producing sponge iron by a rotary hearth furnace. The method is characterized in that an oxygen-enriched combustion technology is adopted to ensure that the oxygen enrichment rate of combustion air is between 23 and 32 percent. In the method, raw materials for production can be recovered iron-containing zinc-containing dust of steel works, so that the method is applicable to the treatment of the recovered iron-containing zinc-containing dust of the steel works and is favorable for environmental protection and waste utilization. Through the method, the combustion temperature is raised, the internal temperature of the furnace is raised and the reduction rate of the sponge iron is improved, the reoxygenation probability of the sponge iron is reduced, and the productivity is improved. The oxygen-enriched combustion technology is adopted, so the required quantity of the combustion air is reduced and the discharge amount of flue gas is reduced, so that the heat loss of flue gas emission is reduced and the consumption of fuel is reduced. Subsequent dust removal by flue gas and useful dust recovery efficiencies are improved, the type and specification of equipment are also correspondingly reduced, and investment economy is improved.

Description

technical field [0001] The invention relates to a method for producing sponge iron on a rotary hearth furnace. The invention belongs to the technical field of effective utilization of heat energy, and relates to the combustion technology of a rotary hearth furnace. Background technique [0002] 1. Production status of sponge iron [0003] The iron production process of reducing iron ore to sponge iron below the melting temperature, the product is direct reduced iron (ie DRI), also known as sponge iron. Compared with steel scrap, sponge iron has the characteristics of moderate lumpiness, regular size, and less harmful residual elements such as sulfur and phosphorus. Using sponge iron instead of scrap steel as the main raw material for electric furnace steelmaking can effectively dilute harmful elements, reduce the content of gases and inclusions, and improve the yield strength, elongation performance, cold working performance, heat treatment performance, and welding perform...

Claims

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Application Information

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IPC IPC(8): C21B13/00
Inventor 薛乃彦王绪东高栋霍永春裴文峰
Owner CHINA JINGYE ENG
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