Ironmaking process with external convolution area

A swirl zone and process technology, which is applied to the traditional blast furnace and smelting reduction ironmaking process, can solve the problems of short residence time in the swirl zone, limited space in the swirl zone, and low combustion rate of pulverized coal, so as to increase the combustion time and improve the injection Good volume and air permeability

Pending Publication Date: 2022-03-29
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the pulverized coal injection in the blast furnace ironmaking process or the smelting reduction ironmaking process is to use the kinetic energy of air blast or oxygen blowing to blow open the material column in the furnace to form a certain space of the swing area, so that the pulverized coal can flow freely in the furnace. Mixing and combustion with oxygen in the roundabout, but because the furnace is filled with various materials, the space in the roundabout is limited, and the movement of pulverized coal is very fast, and its residence time in the roundabout is too short, it is difficult to achieve complete combustion and then leave roundabout
[0005] In view of the above situation, it is urgent to develop a new ironmaking process, which can solve the problem of low combustion rate of pulverized coal during pulverized coal injection, ensure full combustion of pulverized coal, increase the amount of pulverized coal injection in the molten iron smelting process and reduce the production cost of molten iron

Method used

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  • Ironmaking process with external convolution area
  • Ironmaking process with external convolution area

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In this embodiment, the coal for injection is pulverized, dried, fluidized, and pressurized in the pulverizing injection system 1 and then becomes pulverized coal, which is transported to the coal injection gun 2 through the injection branch pipe 21, wherein the particle size of the pulverized coal is For 200 mesh, the proportion is 65wt%, and the water content is 1.8wt%;

[0043] The 1000°C oxygen-enriched hot air from the hot blast stove 3 enters the swirl area 41 of the external equipment 4 through the hot air duct 31 under high pressure, and is mixed with the pulverized coal injected by the coal injection gun 2 in the swirl area 41 to generate super During the combustion process of high-temperature gas, cooling water enters from the cooling water inlet 431 of the cooling wall 43 and discharges from the cooling water outlet 432, so as to protect the safety and longevity of the refractory materials and equipment in the outer swing area.

[0044] The ultra-high tempera...

Embodiment 2

[0048] In this embodiment, the coal for injection is pulverized, dried, fluidized, and pressurized in the pulverizing injection system 1 and then becomes pulverized coal, which is transported to the coal injection gun 2 through the injection branch pipe 21, wherein the particle size of the pulverized coal is For 200 mesh, the proportion is 70wt%, and the water content is 1.3wt%;

[0049] The 1250°C oxygen-enriched hot air from the hot blast stove 3 enters the swirl area 41 of the external equipment 4 through the hot air duct 31 under high pressure, and is mixed with the pulverized coal injected by the coal injection gun 2 in the swirl area 41 to generate super During the combustion process of high-temperature gas, cooling water enters from the cooling water inlet 431 of the cooling wall 43 and discharges from the cooling water outlet 432, so as to protect the safety and longevity of the refractory materials and equipment in the outer swing area.

[0050] The ultra-high tempera...

Embodiment 3

[0054] In this embodiment, the coal for injection is pulverized, dried, fluidized, and pressurized in the pulverizing injection system 1 and then becomes pulverized coal, which is transported to the coal injection gun 2 through the injection branch pipe 21, wherein the particle size of the pulverized coal is For 200 mesh, the proportion is 60wt%, and the water content is 0.95wt%;

[0055] The 1150°C oxygen-enriched hot air from the hot blast stove 3 enters the swirl area 41 of the external equipment 4 through the hot air duct 31 under high pressure, and is mixed with the pulverized coal injected by the coal injection gun 2 in the swirl area 41 to generate During the combustion process of ultra-high temperature gas, cooling water enters from the cooling water inlet 431 of the cooling wall 43 and is discharged from the cooling water outlet 432, so as to protect the safety and longevity of the refractory materials and equipment in the outer swing area.

[0056] The ultra-high tem...

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Abstract

The invention discloses an iron-making process with an external rotary area. The iron-making process comprises the following steps that pulverized coal and oxygen-enriched hot air react in external equipment of the rotary area to generate ultra-high-temperature coal gas; and spraying the ultrahigh-temperature coal gas into the blast furnace or the smelting reduction furnace from a tuyere at the lower part of the furnace body to finish the reduction of the iron oxide. According to the ironmaking process, the rotation area where the pulverized coal reacts with the oxygen-enriched hot air is arranged externally, so that the combustion time of the pulverized coal is prolonged, sufficient combustion of the pulverized coal is guaranteed, the pulverized coal injection amount in the smelting process is increased, and the production cost of molten iron is reduced.

Description

technical field [0001] The invention relates to the field of ferrous metallurgy, in particular to an ironmaking process with an external swing zone, which is suitable for traditional blast furnace and smelting reduction ironmaking processes. Background technique [0002] Among the many factors restricting the sustainable development of the iron and steel industry, there are two main points: one is that high-quality coking coal resources are increasingly depleted and the quality is gradually deteriorating, and its price continues to rise sharply; the other is that the iron and steel industry emits a large amount of greenhouse gases. Greenhouse gases (especially CO 2 ) emission control has become a global environmental issue; due to the consumption of coking coal and CO in steel production 2 The emission is concentrated in the molten iron smelting process, thus reducing the consumption of coking coal in the iron smelting process and reducing CO in the smelting process 2 Emis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00C21B11/00
CPCC21B5/003C21B11/00
Inventor 许海法毛晓明徐万仁康健陈小龙
Owner BAOSHAN IRON & STEEL CO LTD
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