Special brick sleeve and method capable of reducing blast furnace tuyere area for long time

Abstract

The invention provides a special brick sleeve and method capable of reducing the area of a blast-furnace tuyere for a long time, and the method comprises the following steps: manufacturing four different types of brick sleeve models, completely inlaying the brick sleeve on the inner side of a tuyere small sleeve, and adopting the structure of a hollow circular truncated cone-shaped air supply duct; pouring materials are stirred and mixed with water to be uniform and then guided into a brick sleeve model, the model is taken down after solidification is conducted for 4-7 days, and the brick sleeve is taken out for use; when the tuyere needs to be shrunk in production, the brick sleeve is arranged in a small sleeve needing to be shrunk after damping down according to a maintenance plan, and the brick sleeve needs to be in close contact with the tuyere small sleeve in the mounting process to prevent cross ventilation; when the tuyere of the blast furnace needs to be expanded, the tuyere can be mashed and pushed into the furnace by a drill rod, so that secondary damping down of the blast furnace can be avoided. The brick sleeve is made of a high-temperature-resistant and scouring-resistant pouring material with specific performance indexes, so that the aim of keeping the area of the tuyere reduced for a long time is fulfilled; the requirement for rapidly enlarging the area of the tuyere is met in the mode of mashing the brick sleeve and pushing the brick sleeve into the furnace, and secondary damping down of the blast furnace is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of blast furnaces, and in particular relates to a special brick sleeve and a method for reducing the blast furnace tuyere area for a long term. Background Art

[0002] Affected by the steel market, blast furnaces need to limit production from time to time. After the blast furnace reduces wind and limits production, the tuyere area needs to be reduced to maintain the original kinetic energy of the blast. Therefore, the blast furnace needs to be shut down and replaced with a small sleeve with a smaller diameter, thereby reducing the air supply area. For example, a small tuyere sleeve with an inner diameter of φ120mm is replaced with a small tuyere sleeve of φ110mm or φ100mm. Since the air supply device is heavy, the adjustment operation is complicated, the labor intensity of the workers is high, and the replaced small sleeve has been deformed due to use and cannot be reused, resulting in a high cost for the small tuyere sleeve. Therefore, the development of a method and related equipment that can maintain the reduced tuyere area for a long time and can quickly adjust the tuyere area is of great significance to improving the smelting efficiency of blast furnaces. Summary of the invention

[0003] The invention provides an environmentally friendly dust-free blast furnace wind stop method to solve the problem that when the existing blast furnace is stopped, a small sleeve needs to be replaced, resulting in high costs.

[0004] In order to solve the above technical problems, the present invention provides a special brick sleeve that can reduce the tuyere area of ​​a blast furnace for a long time. The chemical composition and proportion of the rotating sleeve are as follows: Al2O3≥70%, Si+C≥15%, and the volume density is 110℃×24h≥2.85g / cm 3 , flexural strength 110℃×24h≥3.0MPa, flexural strength 1450℃×3h≥6.0MPa, compressive strength 110℃×24h≥25MPa, compressive strength 1450℃×3h≥55MPa, heating permanent line change rate 1450℃×3h±0.3%.

[0005] The method of reducing the blast furnace tuyere area by using the special brick sleeve is as follows:

[0006] S1. Make four different types of brick sleeve models with outer diameters of φ120mm, φ115mm, inner diameters of φ110mm and φ100mm. The brick sleeve needs to be completely embedded in the inner side of the air outlet sleeve, and its structure is an internal hollow truncated cone-shaped air supply channel;

[0007] S2, after the castable is mixed with water and evenly mixed, it is introduced into the brick sleeve mold, and after solidification for 4-7 days, the mold is removed and the brick sleeve is taken out for standby;

[0008] S3. When the air outlet needs to be reduced due to production needs, according to the maintenance plan, the brick set should be placed in the small set that needs to be reduced after the wind is stopped. During the installation process, the brick set needs to be in close contact with the small air outlet set to prevent cross-winding;

[0009] S4. When the blast furnace needs to expand the tuyere, it is only necessary to crush it with a drill rod and push it into the furnace, which can avoid the second shutdown of the blast furnace.

[0010] Compared with the related art, the present invention has the following beneficial effects:

[0011] By adopting high temperature resistant and erosion resistant casting materials with specific performance indicators to make brick sleeves, the purpose of maintaining the reduction of tuyere area for a long time is achieved; at the same time, by crushing the brick sleeves and pushing them into the furnace, the demand for rapid expansion of tuyere area is achieved, avoiding secondary shutdown of the blast furnace; the present invention improves the smelting efficiency of the blast furnace, reduces the production cost, and has significant economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. Among them:

[0013] Figure 1 It is a structural schematic diagram of the special rotating sleeve of the present invention. DETAILED DESCRIPTION

[0014] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present application and does not limit the present application. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present application without departing from the scope or spirit of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application embodiments should fall within the scope of protection of the present application embodiments.

[0015] Example

[0016] Please refer to Figure 1 This embodiment provides a special brick sleeve that can reduce the blast furnace tuyere area for a long time. The chemical composition and proportion of the rotating sleeve are: Al2O3≥70%, Si+C≥15%, and the volume density is 110℃×24h≥2.85g / cm 3 , flexural strength 110℃×24h≥3.0MPa, flexural strength 1450℃×3h≥6.0MPa, compressive strength 110℃×24h≥25MPa, compressive strength 1450℃×3h≥55MPa, heating permanent line change rate 1450℃×3h±0.3%. The brick sleeve is made of high temperature resistant and erosion resistant casting materials with specific performance indicators. It has excellent high temperature resistance and erosion resistance, and can be tightly embedded in the blast furnace tuyere small sleeve to achieve the effect of long-term maintenance of the tuyere area reduction.

[0017] The method of reducing the blast furnace tuyere area by using the special brick sleeve is as follows:

[0018] S1. Make four different types of brick sleeve models with outer diameters of φ120mm, φ115mm, inner diameters of φ110mm and φ100mm. The brick sleeve needs to be completely embedded in the inner side of the air outlet small sleeve. Its structure is an internal hollow frustum-shaped air supply channel with a height of 580mm and a lower diameter of φ110mm or φ100mm. It can be adjusted according to the different sizes of the actual small sleeve;

[0019] S2, after the castable is mixed with water and evenly mixed, it is introduced into the brick sleeve mold, and after solidification for 4-7 days, the mold is removed and the brick sleeve is taken out for standby;

[0020] S3. When the air outlet needs to be reduced due to production needs, according to the maintenance plan, the brick set should be placed in the small set that needs to be reduced after the wind is stopped. During the installation process, the brick set needs to be in close contact with the small air outlet set to prevent cross-winding;

[0021] S4. When the blast furnace needs to expand the tuyere, it is only necessary to crush it with a drill rod and push it into the furnace, which can avoid the second shutdown of the blast furnace.

[0022] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A special brick sleeve that can reduce the tuyere area of ​​a blast furnace for a long time, characterized in that: The chemical composition and proportion of the rotary sleeve are: Al2O3≥70%, Si+C≥15%, and the volume density is 110℃×24h≥2.85g / cm 3 , flexural strength 110℃×24h≥3.0MPa, flexural strength 1450℃×3h≥6.0MPa, compressive strength 110℃×24h≥25MPa, compressive strength 1450℃×3h≥55MPa, heating permanent line change rate 1450℃×3h±0.3%.

2. A method for reducing the tuyere area of ​​a blast furnace using the special brick sleeve according to claim 1, characterized in that: The method is as follows: S1. Make four different types of brick sleeve models with outer diameters of φ120mm, φ115mm, inner diameters of φ110mm and φ100mm. The brick sleeve needs to be completely embedded in the inner side of the air outlet sleeve, and its structure is an internal hollow truncated cone-shaped air supply channel; S2, after the castable is mixed with water and evenly mixed, it is introduced into the brick sleeve mold, and after solidification for 4-7 days, the mold is removed and the brick sleeve is taken out for standby; S3. When the air outlet needs to be reduced due to production needs, according to the maintenance plan, the brick set should be placed in the small set that needs to be reduced after the wind is stopped. During the installation process, the brick set needs to be in close contact with the small air outlet set to prevent cross-winding; S4. When the blast furnace needs to expand the tuyere, it is only necessary to crush it with a drill rod and push it into the furnace, which can avoid the second shutdown of the blast furnace.

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