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Additive for improving fluidity of pulverized coal for blast furnace injection and using method thereof

An additive and fluidity technology, applied in blast furnaces, blast furnace details, furnaces, etc., can solve the problems of increasing sources of iron-containing minerals in blast furnace ironmaking and poor fluidity, and achieve the effects of increasing sources, reducing costs, and improving fluidity

Inactive Publication Date: 2018-10-26
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can not only improve the fluidity of pulverized coal for blast furnace injection, but also increase the source of iron-containing minerals in blast furnace ironmaking, so as to solve the problem of poor fluidity caused by the large amount of cheap coal used, so as to achieve stable injection of powder and improve the quality of coal. The purpose of comparing and reducing costs

Method used

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  • Additive for improving fluidity of pulverized coal for blast furnace injection and using method thereof
  • Additive for improving fluidity of pulverized coal for blast furnace injection and using method thereof
  • Additive for improving fluidity of pulverized coal for blast furnace injection and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Under non-public circumstances, the blast furnace of an ironworks carried out the following implementation verification:

[0019] (1) Selection of dust removal ash and pulverized coal.

[0020] The sintered dedusting ash was selected as the dedusting ash in this embodiment, and the chemical composition of the sintering dedusting ash is shown in Table 1.

[0021] The chemical composition (mass percentage, wt%) of table 1 embodiment 1 dedusting ash

[0022] ingredient name

TF

C

SiO 2

CaO

MgO

al 2 o 3

Cl

K+Na

burn out

Included ratio

57.29

4.47

5.31

3.92

0.71

2.95

0.01

0.17

1.0

[0023] Embodiment 1 Coal powder is selected from the pulverized coal (anthracite A1, bituminous coal B1) used for on-site injection, and its industrial analysis is as shown in Table 2. From the composition, it can be seen that the volatile matter Vad of A1 is 10.57wt%, which is a typical anthracite coal powder;...

Embodiment 2

[0036] A certain pellet dust removal ash was selected as the dust removal dust of Example 2, and the chemical composition of the pellet dust removal dust is shown in Table 4.

[0037] The chemical composition (mass percentage, wt%) of table 4 embodiment 2 pelletizing dust removal ash

[0038] ingredient name

[0039] Example 2 The pulverized coal is selected from pulverized coal (anthracite A2) for on-site injection blast furnace.

[0040] Table 5 Example 2 Industrial analysis of pulverized coal injection (mass percentage, wt%)

[0041] anthracite

[0042] Table 6 Embodiment 2 Pellet dedusting ash and self physical properties of anthracite

[0043]

[0044] Dry the coal powder at 80°C for 2 hours, dry the pellet ash at 120°C for 3 hours and mix it with a mixer. Similarly, mix the coal powder A2 and the pellet ash with a mixer, According to the Carr liquidity index (F (index) ) to determine the fluidity of the powder. The ratio of pellet dust removal ...

Embodiment 3

[0049] In this embodiment, a blast furnace bag dust is selected as the dust of Example 3, and the chemical composition of the dust is shown in Table 8.

[0050] The chemical composition (mass percentage, wt%) of table 8 embodiment 3 blast furnace dedusting ash

[0051] ingredient name

TF

C

SiO 2

CaO

MgO

al 2 o 3

Cl

K+Na

Included ratio

40.0

30.0

11.33

10.55

4.0

2.72

0.1

0.05

[0052]The coal powder of embodiment 3 is the same as that of embodiment 2 (anthracite A2). The physical properties of blast furnace bag dust removal ash are shown in Table 9.

[0053] The self physical property of table 9 embodiment 3 blast furnace dedusting ash

[0054]

[0055] Dry the coal powder at 60°C for 4 hours, dry the dust at 80°C for 5 hours and mix it with a mixer. Similarly, mix the coal powder A2 and the dust with a mixer. Index (F (index) ) to determine the fluidity of the powder. The ratio of blast fur...

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Abstract

The invention belongs to the technical field of blast furnace ironmaking, and particularly relates to an additive for improving the fluidity of pulverized coal for blast furnace injection and a usingmethod thereof. The using method comprises the steps that dried metallurgical dedusting ash and the pulverized coal are mixed evenly and injected into a blast furnace from a blast furnace coal gun. The using method can not only improve the flowing performance of the pulverized coal for injection, but also increase the source of iron-bearing minerals in blast furnace ironmaking, so as to achieve stable injection of the pulverized coal and reduce production cost.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to an additive for improving the flowability of pulverized coal for blast furnace injection and a method for using the same. Background technique [0002] The fluidity of pulverized coal for blast furnace injection belongs to the basic characteristics of pulverized coal, which reflects the performance of powder transportation in the process of blast furnace coal injection. Good conveying performance is a prerequisite for maintaining uniform and stable coal injection during the coal injection process. At present, in order to reduce production costs, a large amount of cheap and poorly fluid coal is injected into the blast furnace. However, when the fluidity of the pulverized coal is poor, abnormal phenomena such as blocked guns, empty guns, and nozzle clogging will occur, resulting in severe coal injection. Fluctuation and uneven coal injection process, f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/02C21B5/00
Inventor 高强健沈峰满王婉露郑海燕姜鑫崔军坡
Owner NORTHEASTERN UNIV
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