Blast furnace tuyere small sleeve protection structure and manufacturing method thereof

Abstract

The application discloses a blast furnace tuyere small sleeve protection structure and a manufacturing method thereof. The blast furnace tuyere small sleeve protection structure comprises a wear-resistant layer and a pouring layer. The wear-resistant layer is arranged on the inner wall of the tuyere small sleeve. The pouring layer is arranged on the front end face and the outer wall of the tuyere small sleeve, and the pouring layer is made of wear-resistant material. The wear-resistant layer is arranged on the inner wall of the tuyere small sleeve to prevent the tuyere small sleeve from being worn by the furnace charge. The pouring layer is arranged on the front end face and the outer wall of the tuyere small sleeve, and the pouring layer is made of wear-resistant material to prevent the tuyere small sleeve from being melted by the molten iron. Therefore, the service life of the tuyere small sleeve is prolonged, and the blast furnace downtime rate is reduced.

Description

Technical Field

[0001] This application belongs to the technical field of blast furnace supporting equipment, specifically relating to a small protective structure for blast furnace tuyeres and its manufacturing method. Background Technology

[0002] The tuyere sleeve is a key component of the blast furnace blast system, responsible for supplying hot blast and pulverized coal to the furnace. The tuyere sleeve operates in an extremely harsh environment, enduring the high-temperature scouring of the hot blast (1000–1250°C), the impact and scouring of slag and iron at around 1500°C, and the high-speed circulation of incandescent materials (mainly coke). Its outer surface is subjected to high-temperature radiation of around 2000°C from the swirling zone and convective heat transfer from airflow exceeding 1000°C and slag and iron. The inner wall of the tuyere must withstand thermal stress caused by the significant temperature difference between the inside and outside. Furthermore, when pulverized coal is injected, the tuyere is subjected to the scouring and abrasion of the high-speed coal particles. This harsh working environment makes the tuyere sleeve highly susceptible to melting from contact with molten iron or severe wear from the furnace charge, leading to water leakage. Once the tuyere sleeve is damaged and leaks, temporary blasting must be stopped for replacement, and frequent replacements will severely impact blast furnace operation and output. Summary of the Invention

[0003] To address the technical problem in the prior art that the tuyere sleeve is easily damaged by contact with molten iron or severely worn by furnace charge, resulting in water leakage and requiring frequent replacement, which seriously affects the operation and output of the blast furnace, this application provides a protective structure for the blast furnace tuyere sleeve and its manufacturing method, thereby improving the service life of the tuyere sleeve and reducing the blast furnace shutdown rate.

[0004] The first aspect of this application provides a protective structure for a small sleeve on a blast furnace tuyeres, comprising:

[0005] A wear-resistant layer is disposed on the inner wall of the air vent sleeve;

[0006] A casting layer is provided on the front end face and outer wall of the air vent sleeve, and the casting layer is made of a wear-resistant material.

[0007] In some embodiments, the wear-resistant layer is also disposed on the front end face and outer wall of the air vent sleeve, and the casting layer is disposed outside the wear-resistant layer.

[0008] In some embodiments, the system further includes a first keel and a second keel. An annular groove is provided on the outer wall of the air vent sleeve. The first keel is disposed in the annular groove, and the second keel is disposed on the outer wall of the air vent sleeve and connected to the first keel. The casting layer covers the first keel and the second keel.

[0009] In some embodiments, a fastener is also included, wherein the first keel has an opening and lugs are provided at both ends of the opening, and the fastener is used to fix the lugs in the annular groove.

[0010] In some embodiments, a plurality of V-shaped anchors are also included, which are respectively disposed on the first keel and the second keel, and the casting layer covers the V-shaped anchors.

[0011] In some implementations, adjacent V-shaped anchors are arranged at a 90° angle.

[0012] In some embodiments, a protective layer is also included, which is disposed outside the casting layer.

[0013] In some embodiments, the protective layer has a plurality of vent holes.

[0014] A second aspect of this application provides a method for manufacturing a protective structure for a blast furnace tuyeres sleeve, comprising:

[0015] A wear-resistant layer is welded onto the front face, outer arm, and inner wall of the air vent sleeve.

[0016] A first keel is installed in the annular groove, and a second keel is set on the outer wall of the air vent sleeve and riveted to the first keel.

[0017] The fasteners are connected to the buckles of the first keel and fixed in the annular groove;

[0018] V-shaped anchors were welded onto the first and second keels respectively;

[0019] Install a protective layer around the V-shaped anchor;

[0020] Self-flowing material is injected into the protective layer to form a casting layer.

[0021] A blast furnace tuyere sleeve protective structure provided according to one or more embodiments of this application has the following technical effects:

[0022] The wear-resistant layer is provided on the inner wall of the tuyer sleeve to prevent the tuyer sleeve from being worn by the furnace charge. The casting layer is provided on the front end face and outer wall of the tuyer sleeve. The casting layer is made of wear-resistant material to prevent the tuyer sleeve from being melted by contact with molten iron, thereby improving the service life of the tuyer sleeve and reducing the blast furnace shutdown rate. Attached Figure Description

[0023] Figure 1 A schematic diagram of the protective structure of the blast furnace tuyeres sleeve according to an embodiment of this application is shown.

[0024] Figure 2A flowchart illustrating the manufacturing method of the blast furnace tuyeres protective structure according to an embodiment of this application is shown.

[0025] Explanation of reference numerals in the attached drawings: 1-Air vent sleeve; 2-Wear-resistant layer; 3-Annular groove; 4-First keel; 5-Second keel; 6-Hook ear; 7-Fastener; 8-V-shaped anchor; 9-Pouring layer; 10-Protective layer. Detailed Implementation

[0026] To enable those skilled in the art to better understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0027] Reference Figure 1 As shown, in a first aspect embodiment of this application, a protective structure for a blast furnace tuyeres sleeve is provided, comprising a wear-resistant layer 2 and a casting layer 9;

[0028] The wear-resistant layer 2 is disposed on the inner wall of the air vent sleeve 1;

[0029] The casting layer 9 is disposed on the front end face and outer wall of the tuyer sleeve 1, and the casting layer 9 is made of a wear-resistant material. In this embodiment, the casting layer is made of ceramic material. Ceramic has good high-temperature resistance and can effectively prevent the tuyer sleeve 1 from being melted by contact with molten iron.

[0030] The blast furnace tuyeres sleeve protective structure provided in this application embodiment has a wear-resistant layer 2 disposed on the inner wall of the tuyeres sleeve 1 to prevent the tuyeres sleeve 1 from being worn by the furnace charge. The casting layer 9 is disposed on the front end face and outer wall of the tuyeres sleeve 1. The casting layer 9 is made of wear-resistant material to prevent the tuyeres sleeve 1 from being melted by contact with molten iron, thereby improving the service life of the tuyeres sleeve 1 and reducing the blast furnace shutdown rate.

[0031] In some embodiments, the wear-resistant layer 2 is further disposed on the front end face and outer wall of the tuyer sleeve 1, and the casting layer 9 is disposed outside the wear-resistant layer 2. By providing the wear-resistant layer 2 on the front end face and outer wall of the tuyer sleeve 1, the dual-layer effect of the wear-resistant layer 2 and the casting layer 9 provides better protection for the front end face and outer wall of the tuyer sleeve 1, effectively preventing the tuyer sleeve 1 from being damaged by contact with molten iron, thereby improving the service life of the tuyer sleeve 1 and reducing the blast furnace shutdown rate.

[0032] In some embodiments, the blast furnace tuyeres sleeve protective structure further includes a first keel 4 and a second keel 5. An annular groove 3 is provided on the outer wall of the tuyeres sleeve 1. The first keel 4 is disposed in the annular groove 3, and the second keel 5 is disposed on the outer wall of the tuyeres sleeve 1 and connected to the first keel 4. The castable layer 9 encloses the first keel 4 and the second keel 5. The first keel 4 and the second keel 5 are arranged at a 90° angle and are riveted together at their intersection. Strengthening the castable layer 9 with the keels improves its strength and the connection between the castable layer 9 and the tuyeres sleeve 1, while also fixing the relative position between the tuyeres sleeve 1 and the castable layer 9.

[0033] In some embodiments, the blast furnace tuyeres sleeve protective structure further includes fasteners 7. The first keel 4 has an opening, and the two ends of the opening are provided with buckles 6. The fasteners 7 are used to fix the buckles 6 in the annular groove 3. The fasteners 7 are bolts and nuts. The bolt passes through the buckles 6 and is fixed in the annular groove 3 by the nut. Washers can be added to the bolt to adjust the gap between the first keel 4 and the tuyeres sleeve 1. The connection by the bolt and nut facilitates installation and disassembly.

[0034] In some embodiments, the blast furnace tuyeres protective structure further includes a plurality of V-shaped anchors 8, which are respectively disposed on the first keel 4 and the second keel 5, and the casting layer 9 covers the V-shaped anchors 8. The V-shaped anchors 8 on the first keel 4 and the second keel 5 ensure a tighter connection between the casting layer 9 and the first keel 4 and the second keel 5, preventing slippage or detachment.

[0035] In some further embodiments, adjacent V-shaped anchors 8 are arranged at a 90° angle. By arranging adjacent V-shaped anchors 8 at a 90° angle, the force direction among the V-shaped anchors 8 is more uniform, which can strengthen the connection between the cast layer 9 and the first keel 4 and the second keel 5, and improve the structural strength.

[0036] In some embodiments, the blast furnace tuyeres protective structure further includes a protective layer 10, which is disposed outside the casting layer 9. By replacing the mold with the protective layer 10, demolding is not required, thus preventing the casting from falling off during the demolding process; in addition, the protective layer 10 can prevent the casting layer 9 from falling off during transportation and other processes.

[0037] In some embodiments, the protective layer 10 is provided with several vent holes, which helps to reduce defects such as pores in the casting layer 9, making it less likely for molten iron to penetrate the casting layer 9, thereby preventing the tuyer sleeve 1 from being damaged by contact with molten iron.

[0038] Reference Figure 2As shown in the second aspect of this application, a method for manufacturing a protective structure for a blast furnace tuyeres sleeve is provided, comprising:

[0039] Step S1: Weld a wear-resistant layer 2 onto the front end face, outer arm, and inner wall of the air vent sleeve 1;

[0040] Step S2: The first keel 4 is installed in the annular groove 3, and the second keel 5 is set on the outer wall of the air vent sleeve 1 and riveted to the first keel 4.

[0041] Step S3: Connect the fastener 7 to the buckle 6 of the first keel 4 and fix it in the annular groove 3;

[0042] Step S4: Weld V-shaped anchors 8 onto the first keel 4 and the second keel 5 respectively;

[0043] Step S5: Install the protective layer 10 around the V-shaped anchor 8;

[0044] Step S6: Inject self-flowing material into the protective layer 10 to form the casting layer 9.

[0045] The method for manufacturing the protective structure of the blast furnace tuyeres provided in this application embodiment prevents the tuyeres 1 from being worn by the furnace charge by welding a wear-resistant layer 2 onto the front end face, outer arm and inner wall of the tuyeres 1. By injecting self-flowing material into the front end face and outer wall of the tuyeres 1 to form a casting layer 9, the tuyeres 1 is prevented from being melted by contact with molten iron, thereby improving the service life of the tuyeres 1 and reducing the blast furnace shutdown rate.

[0046] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0048] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0050] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A protective structure for a small sleeve at a blast furnace tuyere, characterized in that, include: A wear-resistant layer is disposed on the inner wall of the air vent sleeve; A casting layer is provided on the front end face and outer wall of the air vent sleeve. The casting layer is made of wear-resistant material and is formed by self-flowing material injected into the protective layer. The first keel and the second keel, the outer wall of the air vent sleeve is provided with an annular groove, the first keel is disposed in the annular groove, the second keel is disposed on the outer wall of the air vent sleeve and connected to the first keel, and the casting layer wraps the first keel and the second keel. The protective layer is disposed outside the casting layer.

2. The blast furnace tuyeres protective structure according to claim 1, characterized in that, The wear-resistant layer is also provided on the front end face and outer wall of the air vent sleeve, and the casting layer is provided outside the wear-resistant layer.

3. The blast furnace tuyeres protective structure according to claim 2, characterized in that, It also includes fasteners, wherein the first keel has an opening and the opening has lugs at both ends, and the fasteners are used to fix the lugs in the annular groove.

4. The blast furnace tuyeres protective structure according to claim 3, characterized in that, It also includes multiple V-shaped anchors, which are respectively disposed on the first keel and the second keel, and the casting layer covers the V-shaped anchors.

5. The blast furnace tuyeres protective structure according to claim 4, characterized in that, Adjacent V-shaped anchors are arranged at a 90° angle.

6. The blast furnace tuyeres protective structure according to claim 1, characterized in that, The protective layer has several vent holes.

7. A method for manufacturing a protective structure for a blast furnace tuyere sleeve, characterized in that, include: A wear-resistant layer is welded onto the front face, outer arm, and inner wall of the air vent sleeve. A first keel is installed in the annular groove, and a second keel is set on the outer wall of the air vent sleeve and riveted to the first keel. The fasteners are connected to the buckles of the first keel and fixed in the annular groove; V-shaped anchors were welded onto the first and second keels respectively; Install a protective layer around the V-shaped anchor; Self-flowing material is injected into the protective layer to form a casting layer.

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