A tuyere sleeve protected by grouting and a blast furnace

Abstract

This application discloses a tuyer sleeve protected by grouting and a blast furnace. The tuyer sleeve includes an outer sleeve wall and an inner sleeve wall arranged concentrically, with a chamber enclosed between them. The front and rear ends of the chamber are sealed by a front end wall and a rear end wall, respectively. The chamber is divided into an inlet chamber, an outlet chamber, an inlet channel, and an outlet channel by a partition. An inlet and an outlet are provided on the rear end wall. The inlet, inlet chamber, and inlet channel are connected, as are the outlet, outlet chamber, and outlet channel. The application is characterized by including a grouting pipe that penetrates the outlet chamber. The inlet of the grouting pipe is located on the rear end wall, and the outlet is located on the outer sleeve wall. Grout enters from the inlet of the grouting pipe and is transported to the outlet of the grouting pipe, where it is laid on the upper outer surface of the outer sleeve wall and solidifies to form a protective layer. The tuyer sleeve proposed in this application significantly improves the ability of the tuyer sleeve to resist the erosion of smelting materials inside the blast furnace.

Description

Technical Field

[0001] This application relates to the field of blast furnace technology, and in particular to a tuyeres sleeve protected by grouting and a blast furnace. Background Technology

[0002] In blast furnace smelting production, the tuyere sleeve is a key cooling device, and its performance stability and service life are crucial to the continuous and efficient operation of the blast furnace. However, this device faces severe challenges in actual service: its outer surface, due to long-term exposure to the blast furnace environment, is highly susceptible to erosion and damage from molten slag and iron dripping; at the same time, its front face, which is in direct contact with the furnace charge, not only bears the continuous mechanical wear of the furnace charge but also needs to withstand the melting erosion caused by extreme high temperatures, making this area a high-risk area for damage.

[0003] To address these failure issues, the industry has tried various protective measures, such as optimizing the internal heat exchange structure of the vent sleeve to enhance cooling capacity, depositing high-temperature alloy layers on vulnerable areas to improve surface heat resistance, and installing ceramic protective sheets to resist wear and high temperatures. However, these traditional methods all have significant limitations: optimized heat exchange designs often fail to achieve timely and effective cooling for the large amount of concentrated heat energy that a local area is subjected to instantaneously, resulting in limited effectiveness; the deposited high-temperature alloy layers have a relatively low upper limit of heat resistance under actual high-temperature oxidation and thermal stress cycling conditions, making them prone to oxidation, cracking, or even peeling and failure; and when ceramic materials are used for protection, there is a common problem with the bonding between the ceramic sheet and the metal substrate of the vent sleeve, with insufficient interfacial bonding strength, making it extremely easy for the ceramic sheet to detach under thermal shock and mechanical impact, also leading to protection failure. Utility Model Content

[0004] In view of the technical problems existing in the prior art, this application proposes a tuyere sleeve and a blast furnace protected by grouting. The tuyere sleeve has a protective layer on the outside by grouting, which can effectively prevent the corrosion of the furnace material. Moreover, compared with the prior art, it has higher high temperature resistance, better protection, and is not easy to fall off.

[0005] This application proposes a small vent sleeve protected by grouting, comprising an outer sleeve wall and an inner sleeve wall arranged concentrically, with a cavity enclosed between them. The front and rear ends of the cavity are respectively sealed by a front end wall and a rear end wall. The cavity is divided into an inlet cavity, an outlet cavity, an inlet channel, and an outlet channel by a partition. An inlet and an outlet are provided on the rear end wall. The inlet, inlet cavity, and inlet channel are connected, as are the outlet, outlet cavity, and outlet channel. The application is characterized by further including a grouting pipe that penetrates the outlet cavity. The inlet of the grouting pipe is located on the rear end wall, and the outlet of the grouting pipe is located on the outer sleeve wall. Grout enters from the inlet of the grouting pipe and is transported to the outlet of the grouting pipe, where it is laid on the upper outer surface of the outer sleeve wall and solidifies to form a protective layer.

[0006] Optionally, the protective layer can be repeatedly removed during the use of the air vent sleeve by means of a tool inserted through the grouting pipe, and then repaved after removal.

[0007] Optionally, the centerline of the grouting pipe is parallel to the axial outer contour line of the outer casing.

[0008] Optionally, it also includes an axial baffle and a radial baffle. The axial baffle is a long strip and is arranged on the outer side of the outer sleeve along the axial direction of the air vent sleeve. The radial baffle is an arc and is arranged at the connection between the outer sleeve and the rear end wall. The axial baffle is connected to the two ends of the radial baffle.

[0009] Optionally, the number of axial baffles is two, and the angle M between the plane of any one axial baffle and the plane of the axis of the air outlet sleeve and the axis of the grouting pipe is in the range of 50°≥M≥30°.

[0010] Optionally, the included angle M is 40°.

[0011] Optionally, the range of the central angle N corresponding to the arc length of the radial baffle is: 100° ≥ N ≥ 60°

[0012] Optionally, the height of the axial baffle is less than 20 mm.

[0013] This application also proposes a blast furnace, wherein the furnace wall is provided with the aforementioned tuyere sleeve protected by grouting, and the outlet of the grouting pipe of the tuyere sleeve is located at the highest point of the outer wall of the tuyere sleeve extending into the blast furnace.

[0014] Optionally, the axial baffle of the tuyer sleeve has a length along the axial direction of the tuyer sleeve that does not exceed the length of the portion of the outer wall sleeve that extends into the blast furnace.

[0015] The vent sleeve protected by grouting proposed in this application is equipped with a grouting pipe. The outer wall of the vent sleeve can be grouted again through the grouting pipe. Therefore, the resistance of the vent sleeve to corrosion can be improved by multiple grouting protection methods. Moreover, since the grout has the advantages of high temperature resistance, corrosion resistance, and wear resistance, it has a higher corrosion resistance than existing technologies such as welding. Furthermore, the grout and the vent sleeve are tightly bonded and are not easy to fall off. Attached Figure Description

[0016] The preferred embodiments of this application will now be described in further detail with reference to the accompanying drawings, wherein:

[0017] Figure 1 This is a perspective view of a three-dimensional structure of a small air vent sleeve protected by grouting according to an embodiment of this application;

[0018] Figure 2 yes Figure 1 A-direction view of the structure shown;

[0019] Figure 3 yes Figure 2 The structure shown is a cross-sectional view along BB;

[0020] Figure 4 This is a partial structural schematic diagram of the air vent sleeve protected by grouting according to an embodiment of this application;

[0021] Figure 5 yes Figure 4 The structure shown is viewed from direction C.

[0022] Explanation of reference numerals in the attached figures:

[0023] 100. Air vent sleeve; 101. Outer sleeve wall; 102. Inner sleeve wall; 103. Chamber; 104. Front end wall; 105. Rear end wall; 107. Water inlet; 106. Partition; 108. Water outlet; 109. Grouting pipe; 1032. Water outlet cavity; 1033. Water inlet channel; 1034. Water outlet channel; 201. Axial baffle; 202. Radial baffle; 1091. Opening; 110. Protective layer. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] In the following detailed description, reference can be made to the accompanying drawings, which form part of this application and illustrate specific embodiments of the present application. In the drawings, similar reference numerals describe substantially similar components in different figures. Specific embodiments of the present application are described in sufficient detail below to enable those skilled in the art to implement the technical solutions of the present application. It should be understood that other embodiments may also be utilized, or structural, logical, or electrical changes may be made to the embodiments of the present application.

[0026] Figure 1 This is a perspective view of a three-dimensional structure of a small air vent sleeve protected by grouting, according to an embodiment of this application. Figure 2 yes Figure 1 View A of the structure shown. Figure 3 yes Figure 2 The structure shown is a cross-sectional view along BB. Combined with... Figures 1-3 As shown, the vent sleeve 100 protected by grouting includes an outer sleeve wall 101 and an inner sleeve wall 102 arranged concentrically, with a chamber 103 enclosed between them. The front and rear ends of the chamber 103 are sealed by a front end wall 104 and a rear end wall 105, respectively. The chamber 103 is divided into an inlet chamber (not shown in the figure), an outlet chamber 1032, an inlet channel 1033, and an outlet channel 1034 by a partition 106 (only the partition between the inlet and outlet channels is shown in the figure; the partition between the inlet and outlet chambers is not shown). An inlet 107 and an outlet 108 are provided on the rear end wall 105. The inlet 107, the inlet chamber, and the inlet channel 1033 are connected, and the outlet 108, the outlet chamber 1032, and the outlet channel 1034 are connected. The air vent sleeve 100 also includes a grouting pipe 109 that runs through the water outlet cavity 1032. The opening 1091 of the grouting pipe 109 is located on the rear end wall 105, and the outlet of the grouting pipe 109 is located on the outer sleeve wall 101. Grout enters from the opening of the grouting pipe 109 and is transported to the outlet of the grouting pipe 109 and laid on the upper outer surface of the outer sleeve wall 101. After solidification, it forms a protective layer 110.

[0027] The grout used in this process can be blast furnace foundation grout, a material used in blast furnace foundation construction. It primarily fills voids at the bottom of the blast furnace, repairs cracks, and enhances the foundation's strength. This grout is typically made from raw materials such as cement, sand, lime, and gypsum, with cement being the primary material responsible for hardening and solidification. Blast furnace foundation grout possesses advantages such as high-temperature resistance, wear resistance, corrosion resistance, and high compressive strength. Furthermore, it is relatively inexpensive, easy to apply, and has a long service life, effectively extending the lifespan of the tuyeres sleeve.

[0028] In some embodiments of this application, optionally, the centerline of the grouting pipe 109 is substantially parallel to the axial outer contour line of the outer casing 101. This allows the grout to be laid more smoothly on the upper outer surface of the outer casing during grouting, and also facilitates the removal of residual grout. The axial outer contour line of the outer casing refers to any line segment on the arc surface of the outer casing that is parallel to the centerline of the outer casing.

[0029] The tuyere sleeve proposed in this application is equipped with a grouting pipe, through which the outer wall of the tuyere sleeve can be grouted again. Therefore, the resistance of the tuyere sleeve to corrosion can be improved through multiple grouting protection methods. Moreover, because the grout has the advantages of high temperature resistance, corrosion resistance, and wear resistance, it has a higher corrosion resistance compared with existing technologies such as welding. Furthermore, the grout and the tuyere sleeve are tightly bonded and not easily detached. It can solidify on the upper outer surface and part of the front end surface of the outer sleeve wall, preventing slag and iron dripping onto the tuyere sleeve from corroding the outer surface of the tuyere sleeve, and protecting the front end surface, reducing damage caused by furnace charge wear and high-temperature melting.

[0030] In some embodiments of this application, the protective layer 110 can be repeatedly removed by a tool inserted through the grouting pipe 109 during the use of the vent sleeve 100, and a new protective layer can be formed after the layer is re-laid and solidified.

[0031] The initial grouting of the vent sleeve should be done before installation, with the grout applied to the outer surface of the sleeve. For subsequent grouting, without disassembling the sleeve, a cleaning tool should be inserted through the grouting pipe to remove any residual grout, and then the grouting pipe should be used to re-grout, forming a protective layer for the sleeve.

[0032] Figure 4 This is a partial structural diagram of a small air vent sleeve protected by grouting according to an embodiment of this application. Figure 5 yes Figure 4 The structure shown is viewed from direction C. Combined with... Figures 3-5 As shown, the vent sleeve 100 protected by grouting also includes an axial baffle 201 and a radial baffle 202. The axial baffle 201 is a long strip and is disposed along the axial direction of the vent sleeve 100 on the outer side of the outer sleeve wall 101. The radial baffle 202 is arc-shaped and is disposed at the connection between the outer sleeve wall 101 and the rear end wall 105. The axial baffle 201 is connected to the two ends of the radial baffle 202. In some embodiments of this application, optionally, the height of the axial baffle is less than 20 mm. The baffle can be made of steel or copper metal sheets / strips and welded to the sleeve.

[0033] By installing axial and radial baffles on the outer wall of the vent sleeve, the grout flowing from the outer side of the outer wall of the grouting pipe can remain on the upper surface of the outer wall with a thicker thickness, thereby forming a thicker protective layer and improving the strength of the protective layer.

[0034] In some embodiments of this application, optionally, two axial baffles 201 are provided. The angle M between the plane containing any one axial baffle 201 and the plane containing the axis L of the tuyeres sleeve and the axis T of the grouting pipe 109 is within the range of 50° ≥ M ≥ 30°. After the tuyeres sleeve 100 is installed on the blast furnace, if the existing protective layer 110 is removed and grouting is performed again, the position of the axial baffle 201 allows most of the grout to solidify on the upper outer surface of the outer casing wall 101, forming a thicker protective layer on the upper outer surface of the outer casing wall 101, reducing the erosion of the outer surface of the tuyeres sleeve by slag and iron. In this application, after the tuyeres sleeve is installed on the blast furnace, the grouting pipe is located in the upper half of the vertical diameter of the tuyeres sleeve. Preferably, the angle M is 40°.

[0035] In some embodiments of this application, optionally, the range of the central angle corresponding to the arc length of the radial baffle is: 100°≥N≥60°. Within this range, the radial baffle can intercept more slurry and form a tighter enclosure structure with the axial baffle to prevent the slurry from escaping from the gap between the two.

[0036] This application also proposes a blast furnace (not shown in the figure), wherein the furnace wall is provided with the aforementioned tuyere sleeve protected by grouting, and the outlet of the grouting pipe of the tuyere sleeve is located at the highest point of the outer wall of the tuyere sleeve extending into the blast furnace. The axial baffle of the tuyere sleeve, along the axial direction of the tuyere sleeve, does not exceed the length of the outer wall sleeve extending into the blast furnace.

[0037] In summary, the grout sleeve protected by grouting proposed in this application can form a protective layer on the upper outer surface of the outer wall of the grout sleeve through grouting, thereby preventing erosion and damage to the grout sleeve by slag, iron and other substances. Moreover, the protective layer is formed by the gradual solidification of flowing grout, so the bonding between the two is strong and not easy to loosen. Furthermore, the outer wall of the grout sleeve can be repeatedly grouted through the grouting pipe, thereby improving the protective effect of the protective layer on the grout sleeve.

[0038] The above embodiments are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art can make various changes and modifications without departing from the scope of this application. Therefore, all equivalent technical solutions should also fall within the scope of this application.

Claims

1. A vent sleeve protected by grouting, comprising an outer sleeve wall and an inner sleeve wall concentrically arranged, with a cavity enclosed between them, the front and rear ends of the cavity being sealed by a front end wall and a rear end wall respectively, the cavity being divided into an inlet cavity, an outlet cavity, an inlet channel, and an outlet channel by a partition, the rear end wall having an inlet and an outlet, the inlet, the inlet cavity, and the inlet channel being interconnected, and the outlet, the outlet cavity, and the outlet channel being interconnected, characterized in that, It also includes a grouting pipe that runs through the water outlet cavity. The inlet of the grouting pipe is located on the rear end wall, and the outlet of the grouting pipe is located on the outer wall. The grout enters from the inlet of the grouting pipe and is transported to the outlet of the grouting pipe and is laid on the upper outer surface of the outer wall. After solidification, it forms a protective layer.

2. The vent sleeve protected by grouting according to claim 1, characterized in that, The protective layer can be repeatedly removed during the use of the air vent sleeve by a tool inserted through the grouting pipe, and then repaved after removal.

3. The vent sleeve protected by grouting according to claim 1, characterized in that, The centerline of the grouting pipe is parallel to the axial outer contour line of the outer casing.

4. The vent sleeve protected by grouting according to claim 1, characterized in that, It also includes an axial baffle and a radial baffle. The axial baffle is a long strip and is arranged on the outer side of the outer sleeve along the axial direction of the air vent sleeve. The radial baffle is an arc and is arranged at the connection between the outer sleeve and the rear end wall. The axial baffle is connected to the two ends of the radial baffle.

5. The vent sleeve protected by grouting according to claim 4, characterized in that, The number of axial baffles is two. The angle M between the plane of any axial baffle and the plane of the axis of the air outlet sleeve and the axis of the grouting pipe is in the range of 50°≥M≥30°.

6. The vent sleeve protected by grouting according to claim 5, characterized in that, The included angle M is 40°.

7. The vent sleeve protected by grouting according to claim 4, characterized in that, The range of the central angle N corresponding to the arc length of the radial baffle is: 100°≥N≥60°.

8. The vent sleeve protected by grouting according to claim 4, characterized in that, The height of the axial baffle is less than 20mm.

9. A blast furnace, characterized in that, The blast furnace wall is provided with a tuyere sleeve protected by grouting as described in any one of claims 1-8, and the outlet of the grouting pipe of the tuyere sleeve is located at the highest point of the outer wall of the tuyere sleeve extending into the blast furnace.

10. The blast furnace according to claim 9, characterized in that, The axial baffle of the tuyer sleeve has a length along the axial direction of no more than the length of the portion of the outer sleeve that extends into the blast furnace.

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