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Method of loading raw materials into a blast furnace

A raw material and blast furnace technology, which is applied in the field of loading raw materials into the blast furnace, can solve the problem that the thickness of the coke layer is not necessarily clear, and achieve the effect of reducing the amount of coke and reducing CO2 emissions

Active Publication Date: 2018-02-23
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even when coke is mixed into the ore layer, the thickness of the coke layer required to ensure the ventilation resistance of the molten zone is not necessarily clear.

Method used

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  • Method of loading raw materials into a blast furnace
  • Method of loading raw materials into a blast furnace
  • Method of loading raw materials into a blast furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0133] This example is a case where the coke charged into the blast furnace is charged into the furnace in the form of a coke layer and an ore layer without mixing the ore-based raw materials.

[0134] exist Figure 7 In the actual equipment of the blast furnace with the rotating chute method shown, the ratio of the minimum layer thickness of the coke layer in the belly of the blast furnace to the arithmetic mean particle size of the coke was varied at the same tapping ratio, and the operating results in each case were compared. compared. The results are listed in Table 2.

[0135] Here, the tapping ratio refers to dividing the tapping amount (t / d) of the blast furnace per day by the furnace volume (m 3 ) to get the value. In addition, the reducing material ratio, the coke ratio, and the fine powdered carbon ratio are the reducing material amount, the coke amount, and the fine powdered carbon amount (kg / t) used when producing 1 ton of molten iron.

[0136] [Table 2]

[01...

Embodiment 2

[0142] This example is a case where a part of the coke charged into the blast furnace is mixed with ore-based raw materials and charged into the furnace in the form of a coke layer and a mixed layer of coke and ore-based raw materials.

[0143] exist Figure 7 In the actual installation of the blast furnace with the rotary chute system shown, the mixing ratio of coke mixed with ore raw materials and the average layer thickness of the coke layer in the belly of the blast furnace were varied in various ways at the same tapping ratio, and the operation in each case was performed. scores for comparison. The results obtained are listed in Table 3.

[0144] Here, the tapping ratio refers to dividing the tapping amount (t / d) of the blast furnace per day by the furnace volume (m 3 ) to get the value. In addition, the reducing material ratio, the coke ratio, and the fine powdered carbon ratio are the reducing material amount, the coke amount, and the fine powdered carbon amount (kg / ...

Embodiment 3

[0151] Various changes were made to the coke mixing ratio under the conditions in Table 4, and the operating results in each case were compared. The results obtained are listed in Table 4. In addition, except the conditions shown in Table 4, it is the same condition as the invention example 2 of Example 2.

[0152] [Table 4]

[0153] Table 4

[0154]

Invention Example 4

Invention Example 5

Invention Example 6

Coke mixing ratio C mix (kg / t)

60

80

100

The average layer thickness Lc of the coke layer in the belly of the blast furnace ave (mm)

180

180

180

The right side value of (1)

161

155

149

Ratio of reducing materials (kg / t)

510

508

507

Coke ratio (kg / t)

362

360

359

Powdered carbon ratio (kg / t)

148

148

148

Gas utilization rate (%)

48.1

48.2

48.3

Pressure loss of filling layer (kPa / (Nm 3 / min))

21.8

21.7

21.6

[0155] ...

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Abstract

A method of charging raw materials into a blast furnace, which uses a rotary chute to load blast furnace raw materials such as ore-based raw materials and coke into the blast furnace. This method does not mix the coke charged into the blast furnace with In the form of a coke layer and an ore layer, the blast furnace is loaded with raw materials into the blast furnace, or a part of the coke loaded in the blast furnace is mixed with the ore-type raw material, and the coke layer and a mixed layer of coke and ore-type raw materials are mixed. Raw materials are loaded into the blast furnace, and when the coke layer loaded into the furnace in each batch reaches the belly of the blast furnace, the ratio of the minimum layer thickness of the coke layer in the belly of the blast furnace to the arithmetic mean particle size of the coke is properly controlled. At the same time, by controlling the average layer thickness of the coke layer in the belly of the blast furnace to 190 mm or less, stable blast furnace operation and improvement in reduction efficiency due to thinning of the ore layer can be achieved simultaneously.

Description

technical field [0001] The invention relates to a method of charging a blast furnace with raw materials. In particular, the present application relates to a method of charging blast furnace charging raw materials such as ore-based raw materials and coke into a blast furnace using a rotary chute. Background technique [0002] In recent years, from the perspective of preventing global warming, reduction of CO 2 . Especially in the steel industry, CO 2 About 70% of the emissions come from blast furnaces, requiring reduction of CO in blast furnaces 2 emissions. [0003] For blast furnaces, ore materials such as sinter, granules, massive ores, and coke are generally loaded alternately from the furnace roof in layers, and the combustion gas is circulated through the tuyeres to obtain pig iron. The coke and ore-like raw materials charged as raw materials for the blast furnace descend from the furnace roof to the belly of the blast furnace, thereby reducing the ore and raising ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/00C21B7/20
CPCC21B5/006C21B5/008C21B7/20C21B2300/04F27B1/20F27D3/10
Inventor 市川和平广泽寿幸渡壁史朗
Owner JFE STEEL CORP