Protective sleeve for preventing inner wall of radiant tube from being scoured by high-temperature flame

Abstract

The utility model relates to the technical field of protective sleeves, and provides a protective sleeve for preventing high-temperature flame scouring of the inner wall of a radiant tube, the protective sleeve comprises a first sleeve, a second sleeve and a third sleeve, the first sleeve is arranged in the radiant tube, the outer wall of the first sleeve abuts against the inner wall of the radiant tube, the second sleeve is located on the inner side of the first sleeve, and the third sleeve is located on the inner side of the second sleeve. At least two first grid bars are arranged between the first sleeve and the second sleeve, one end of the second sleeve extends to the outside of the first sleeve, the third sleeve is located on the side, away from the first sleeve, of the second sleeve, one end of the third sleeve extends to the inside of the second sleeve, and at least two second grid bars are arranged between the third sleeve and the second sleeve. Two clamping blocks are arranged on the outer wall of the other end of the third sleeve and are oppositely arranged. The radiant tube protection device has the advantages of being easy to install and convenient to manufacture, is suitable for various radiant tube burners, and can effectively protect the radiant tube and prolong the service life of the radiant tube on the premise that the original structure of the radiant tube is not changed.

Description

Technical Field

[0001] This application relates to the field of protective sleeve technology, and more specifically, to a protective sleeve for preventing the inner wall of a radiation tube from being eroded by high-temperature flames. Background Technology

[0002] With the continuous improvement of domestic requirements for the quality and performance of heat-treated steel products, the number of metal workpieces that need to be heat-treated in the metallurgical industry is increasing. The repeated heating or cooling of steel strips during the heating process will cause iron oxide scale to form on the surface of the steel, resulting in metal loss. In order to reduce the oxidation and burning loss of steel strips during the heating process of metal workpieces and effectively avoid decarburization, a heating method that does not directly contact the steel strip has been developed, namely, using radiant tubes to transfer heat to the steel strip through radiation.

[0003] Currently, the heat treatment furnace is filled with a protective atmosphere. Radiant tubes are evenly arranged above and below the steel strip. Inside the radiant tubes, the coal gas and combustion air are ignited and burned by the ignition electrode. The flue gas produced by combustion is turned back at the end of the radiant tube and then preheated by the heat exchanger. Since the radiant tube is the most important heating equipment in heat treatment, the life of the radiant tube directly affects the production capacity of heat treatment. Therefore, the radiant tube plays a vital role in the heat treatment furnace.

[0004] During the production process, the combustion flame of the radiant tube burner is ring-shaped and diffused. At the secondary combustion outlet, the combustion flame continuously heats the radiant tube wall at a high temperature. Since there are no heat dissipation components between the secondary combustion outlet of the burner and the flue duct, the radiant tube wall is prone to problems such as deformation, cracking, and burning due to uneven heating. This requires regular furnace shutdown for maintenance, which seriously affects the production cycle of the heat treatment furnace. Utility Model Content

[0005] The purpose of this application is to provide a protective sleeve to prevent the inner wall of a radiant tube from being eroded by high-temperature flames, thereby protecting the radiant tube and extending its service life without changing its original structure.

[0006] This application provides a protective sleeve to prevent the inner wall of a radiant tube from being eroded by high-temperature flames, and adopts the following technical solution:

[0007] A protective sleeve for preventing high-temperature flame erosion of the inner wall of a radiant tube includes a first sleeve, a second sleeve, and a third sleeve. The first sleeve is disposed inside the radiant tube, and its outer wall abuts against the inner wall of the radiant tube. The second sleeve is located inside the first sleeve, and at least two first grid bars are provided between the first sleeve and the second sleeve. One end of the second sleeve extends to the outside of the first sleeve. The third sleeve is located on the side of the second sleeve away from the first sleeve, and one end of the third sleeve extends to the inside of the second sleeve. At least two second grid bars are provided between the third sleeve and the second sleeve. Two locking blocks are provided on the outer wall of the other end of the third sleeve, and the two locking blocks are arranged opposite each other. The third sleeve is connected to the flue gas duct by a 90° rotational snap-fit ​​through the two locking blocks.

[0008] Preferably, the first grid bars are evenly distributed inside the first sleeve, and the second grid bars are evenly distributed inside the second sleeve.

[0009] Preferably, the first grid bar and the first sleeve, the first grid bar and the second sleeve are integrally formed, and the second grid bar and the second sleeve, the second grid bar and the third sleeve are integrally formed.

[0010] Preferably, the length of the first sleeve is greater than the length of the second sleeve, and the length of the second sleeve is greater than the length of the third sleeve.

[0011] Preferably, the first sleeve, the second sleeve, the third sleeve, and the clamping block are all made of high-temperature resistant SiC material.

[0012] Preferably, the axial length of the portion of the second sleeve located inside the first sleeve is 10-15 cm, and the axial length of the portion of the third sleeve located inside the second sleeve is 10-15 cm.

[0013] Preferably, the thickness of the first grid bar is 2-3 cm, and the thickness of the second grid bar is 2-3 cm.

[0014] Compared with the prior art, the beneficial effects of this application are as follows:

[0015] This application features simple installation and easy manufacturing, and is applicable to various radiant tube burners. It has good utilization and promotion value. By setting up a first sleeve, a second sleeve, and a third sleeve, the outer wall of the first sleeve is attached to the inner wall of the radiant tube to protect it. The second sleeve is used to change the trajectory of the burner flame, preventing the burner flame from directly burning the radiant tube, thus achieving the purpose of protecting the radiant tube and extending its service life. It can also avoid problems such as deformation, cracking, and burning of the radiant tube wall caused by uneven heating, reducing maintenance frequency and extending the production cycle. Since the third sleeve is connected to the flue gas duct by a 90° rotation snap-fit ​​with a locking block, the overall stability of the protective sleeve is improved, preventing the protective sleeve from moving with the direction of flue gas flow during use.

[0016] The three-layer casing structure allows flue gas to pass smoothly through the area between the first and second casings, as well as the area between the second and third casings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a side sectional view of the present invention;

[0020] Figure 3 This is a top view of the present invention;

[0021] Figure 4 A side view of flame combustion without the front burner of this utility model;

[0022] Figure 5 This is a side view of the flame combustion of the front burner using this utility model.

[0023] The reference numerals in the attached figures are as follows:

[0024] 1. First sleeve; 2. Second sleeve; 3. Third sleeve; 4. First grid bar; 5. Second grid bar; 6. Clamping block; 7. Radiation tube; 8. Burner; 9. Flame; 10. Flue gas duct. Detailed Implementation

[0025] 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, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are 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, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] Example

[0032] like Figure 1-5 As shown in the embodiment of this application, the protective sleeve for preventing high-temperature flame erosion of the inner wall of the radiant tube includes a first sleeve 1, a second sleeve 2, and a third sleeve 3. The first sleeve 1 is disposed inside the radiant tube 7, and the outer wall of the first sleeve 1 abuts against the inner wall of the radiant tube 7. The second sleeve 2 is located inside the first sleeve 1. At least two first grid bars 4 are provided between the first sleeve 1 and the second sleeve 2. One end of the second sleeve 2 extends to the outside of the first sleeve 1. The third sleeve 3 is located on the side of the second sleeve 2 away from the first sleeve 1. One end of the third sleeve 3 extends to the inside of the second sleeve 2. At least two second grid bars 5 are provided between the third sleeve 3 and the second sleeve 2. Two locking blocks 6 are provided on the outer wall of the other end of the third sleeve 3. The two locking blocks 6 are arranged opposite each other. The third sleeve 3 is connected to the flue gas duct 10 by rotating 90° and snapping together through the two locking blocks 6.

[0033] In use, the outer wall of the first sleeve 1 is attached to the inner wall of the radiant tube 7 to protect the radiant tube 7. The second sleeve 2 is used to change the trajectory of the burner 8 flame 9 to prevent the burner 8 flame 9 from directly burning the radiant tube 7, thus achieving the purpose of protecting the radiant tube 7 and extending its service life. At the same time, it can avoid problems such as deformation, cracking, and burning of the radiant tube 7 wall caused by uneven heating, reduce maintenance frequency, and extend the production cycle. Since the third sleeve 3 is connected to the flue gas duct 10 by a 90° rotation snap-fit ​​through the clamp 6, the overall stability of the protective sleeve is improved, and the protective sleeve is prevented from moving with the flue gas flow during use. Moreover, the three-layer sleeve structure allows the flue gas to pass smoothly through the area between the first sleeve 1 and the second sleeve 2, as well as the area between the second sleeve 2 and the third sleeve 3.

[0034] In this embodiment, the first grid bar 4 is evenly distributed inside the first sleeve 1, and the second grid bar 5 is evenly distributed inside the second sleeve 2.

[0035] In this embodiment, the first grid bar 4 and the first sleeve 1, and the first grid bar 4 and the second sleeve 2 are integrally arranged, and the second grid bar 5 and the second sleeve 2, and the second grid bar 5 and the third sleeve 3 are integrally arranged.

[0036] In this embodiment, the length of the first sleeve 1 is greater than the length of the second sleeve 2, and the length of the second sleeve 2 is greater than the length of the third sleeve 3.

[0037] In this embodiment, in order to improve the fire resistance of the first sleeve 1, the second sleeve 2, the third sleeve 3 and the clamping block 6, the first sleeve 1, the second sleeve 2, the third sleeve 3 and the clamping block 6 are all made of high-temperature resistant SiC material.

[0038] In this embodiment, the axial length of the portion of the second sleeve 2 located inside the first sleeve 1 is 10-15cm, and the axial length of the portion of the third sleeve 3 located inside the second sleeve 2 is 10-15cm.

[0039] In this embodiment, the thickness of the first grid bar 4 is 2-3 cm, and the thickness of the second grid bar 5 is 2-3 cm.

[0040] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A protective sleeve for preventing high temperature flame impingement on the inner wall of a radiant tube, characterised in that: The application relates to a radiation tube, which comprises a first sleeve, a second sleeve and a third sleeve, the first sleeve is arranged inside a radiation tube, the outer wall of the first sleeve abuts against the inner wall of the radiation tube, the second sleeve is located on the inner side of the first sleeve, at least two first grid bars are arranged between the first sleeve and the second sleeve, one end of the second sleeve extends to the outside of the first sleeve, the third sleeve is located on the side of the second sleeve away from the first sleeve, one end of the third sleeve extends to the inside of the second sleeve, at least two second grid bars are arranged between the third sleeve and the second sleeve, two clamping blocks are arranged on the outer wall of the other end of the third sleeve, the two clamping blocks are oppositely arranged, and the third sleeve is rotatably and buckle-connected with a flue gas duct through the two clamping blocks.

2. The protective sleeve according to claim 1, wherein: The first grid bars are uniformly distributed in the first sleeve, and the second grid bars are uniformly distributed in the second sleeve.

3. The protective sleeve of claim 2, wherein: The first grid bars and the first sleeve, and the first grid bars and the second sleeve are integrally arranged, and the second grid bars and the second sleeve, and the second grid bars and the third sleeve are integrally arranged.

4. The protective sleeve of claim 1, wherein: The length of the first sleeve is greater than the length of the second sleeve, and the length of the second sleeve is greater than the length of the third sleeve.

5. The protective sleeve of claim 1, wherein: The first sleeve, the second sleeve, the third sleeve and the clamping blocks are made of high-temperature-resistant SiC material.

6. The protective sleeve of claim 1, wherein: The axial length of the second sleeve on the inner side of the first sleeve is 10-15 cm, and the axial length of the third sleeve on the inner side of the second sleeve is 10-15 cm.

7. The protective sleeve of claim 1, wherein: The thickness of the first grid bars is 2-3 cm, and the thickness of the second grid bars is 2-3 cm.

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