A high furnace big set prevents the air structure that leaks

Abstract

The application discloses a high-temperature air leakage prevention structure for a large set of a blast furnace, and relates to the technical field of smelting equipment. The structure comprises a sealing shell, which is in a ring structure and is provided with a sealing groove which is open on one side in the axial direction. The opening of the sealing shell is used for allowing a flange connecting part formed between a tuyere large set and a blast furnace shell to extend into the sealing groove, and the sealing shell is sealed and fixed with the tuyere large set and the blast furnace shell respectively, so that the flange connecting gap is isolated from the outside of the sealing groove. The sealing shell and the refractory castable block are arranged, the flange connecting gap formed between the tuyere large set and the blast furnace shell can be isolated from the outside through the sealing shell, the refractory castable block can block the coal gas leakage points on the flange connecting gap, and the coal gas in the blast furnace shell can be effectively prevented from overflowing.

Description

Technical Field

[0001] This invention relates to the field of smelting equipment technology, specifically to a gas-proof structure for a blast furnace main casing. Background Technology

[0002] With the advancement of blast furnace ironmaking technology, high blast temperature, high blast pressure, high oxygen enrichment, large injection, and large blast volume operation have become effective measures to reduce coke ratio and improve utilization coefficient. However, the resulting safety production problems are becoming increasingly prominent. In the middle and late stages of blast furnace service, the tuyere sleeve will deform, causing gas leakage and open flames. The gas concentration near the tuyere platform can reach 1000 PPM, seriously affecting production safety and equipment stability. The causes of blast furnace tuyere sleeve deformation are as follows: 1. After long-term heating, the sleeve's rigidity is insufficient, and its deformation resistance is poor. During blast furnace production, the flange mating surface deforms under external forces. 2. After the blast furnace is put into production, as the furnace temperature rises, the blast furnace shell deforms due to heat, and the sleeve is deformed by circumferential compression and vertical tension. 3. The influence of alkali metals: Alkali metals and heavy metals such as zinc and lead corrode the refractory materials inside the furnace. Therefore, as can be seen from the above, it is difficult to prevent deformation of the blast furnace tuyere sleeve and flange. Replacing the tuyere sleeve and flange can only be done after the blast furnace has been in operation for one generation (one generation is 10 years). Dealing with gas leakage from the tuyere sleeve is a major technical problem in blast furnace production. Therefore, a gas leakage prevention structure for the blast furnace sleeve is proposed. Summary of the Invention

[0003] The purpose of this invention is to provide a gas-proof structure for a blast furnace jacket to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a blast furnace main sleeve anti-leakage structure, comprising a sealing shell, the sealing shell having an annular structure, and the sealing shell having a sealing groove with an opening on one side along the axial direction. The opening of the sealing shell is used to allow the flange connection portion formed between the tuyeres main sleeve and the blast furnace shell to extend into the sealing groove, and to seal and fix the sealing shell to both the tuyeres main sleeve and the blast furnace shell, thereby isolating the flange connection gap from the outside of the sealing groove. A grouting cavity is also formed between the sealing shell, the tuyeres main sleeve, and the blast furnace shell, and a refractory castable block is provided in the grouting cavity, the refractory castable block being able to seal the flange connection gap.

[0005] In a preferred embodiment of this technical solution, the sealing shell is further provided with at least one casting pipe, which is connected to the grouting cavity and can be opened and closed.

[0006] In a preferred embodiment of this technical solution, a heat insulation layer is further provided between the sealed shell and the refractory castable block.

[0007] In this preferred embodiment, the heat insulation layer is ceramic refractory fiber cotton.

[0008] In a preferred embodiment of this technical solution, the sealing shell is further provided with a plurality of wave bodies, which are arranged along a first direction, the first direction being parallel to the direction of the tensile force borne at the connection between the sealing shell and the blast furnace shell.

[0009] In a preferred embodiment of this technical solution, a plurality of protective components are provided between the sealing shell and the blast furnace shell, and the protective components are used to share the tensile force borne at the connection between the sealing shell and the blast furnace shell.

[0010] In a preferred embodiment of this technical solution, the protective component includes: a protective element, a protective rod, and a hinge, wherein the protective element, the protective rod, and the hinge are arranged sequentially along a first direction; the hinge is fixed to the blast furnace shell; the protective element is fixed to the sealing shell; the first end of the protective rod is connected to the protective element, and its second end is hinged to the hinge, wherein the protective rod applies pressure to the connection between the sealing shell and the blast furnace shell through the protective element.

[0011] In a preferred embodiment of this technical solution, an adjustment structure is further provided between the protective component and the protective rod, the adjustment structure being used to adjust the applied pressure.

[0012] In a preferred embodiment of this technical solution, the adjusting structure includes: an internal threaded sleeve and a telescopic spring; the protective rod passes through the protective component and forms a sliding connection with the protective component; the internal threaded sleeve is screwed to the first end of the protective rod; the telescopic spring is sleeved with the protective rod, and the telescopic spring is located between the internal threaded sleeve and the protective component.

[0013] In this preferred embodiment, the sealing shell and the wave body are integrally formed.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] This blast furnace casing leak-proof structure, through the setting of a sealed shell and refractory castable blocks, can isolate the flange connection gap formed between the tuyeres and the blast furnace shell from the outside through the sealed shell, while the refractory castable blocks can seal the gas leakage points on the flange connection gap, thereby effectively preventing the gas inside the blast furnace shell from overflowing.

[0016] Meanwhile, by setting up the protective components, the protective components can apply pressure to the connection between the sealing shell and the blast furnace shell, thereby effectively preventing the connection from being torn due to excessive gas pressure inside the blast furnace shell or expansion of the refractory castable blocks, thus improving the service life of the invention structure. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the structure of the present invention;

[0018] Figure 2 For the present invention Figure 1 Enlarged view of section A;

[0019] Figure 3 This is a structural diagram of the protective component proposed in this invention.

[0020] In the diagram: 1. Tuyere sleeve; 2. Blast furnace shell; 3. Sealing assembly; 301. Sealing shell; 302. Insulation layer; 303. Refractory castable block; 304. Casting pipe; 305. Wave body; 4. Flange connection gap; 5. Protective assembly; 501. Protective component; 502. Protective rod; 503. Hinge; 504. Internal threaded sleeve; 505. Telescopic spring. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that in the description of this invention, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 invention.

[0023] Furthermore, it should be understood that, for ease of description, the dimensions of the various components shown in the accompanying drawings are not drawn to actual scale; for example, the thickness or width of some layers may be exaggerated relative to other layers.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined or described in one figure, it will not need to be discussed or described in detail in the description of the subsequent figures.

[0025] pass Figure 1It is known that the tuyeres sleeve 1 and the blast furnace shell 2 are bolted together by flanges. There is a gap between the flanges connecting the tuyeres sleeve 1 and the blast furnace shell 2. Initially, this gap is extremely small, preventing the gas inside the blast furnace shell 2 from escaping. However, during long-term use, even slight deformation of the tuyeres sleeve 1 or the blast furnace shell 2 will cause the gap to widen, resulting in... Figure 2 As shown in the flange connection gap 4, gas can overflow from the inside of the blast furnace shell 2 along the flange connection gap 4. At the same time, as we know from the background art, it is difficult to ensure that the tuyeres sleeve 1 and the blast furnace shell 2 do not deform during the blast furnace production process. Therefore, in order to solve the technical problems in the background art, the present invention proposes a sealing component 3. The sealing component 3 is used to seal the flange connection gap 4 to suppress the overflow of gas from the inside of the blast furnace shell 2.

[0026] Specifically, such as Figure 1 and Figure 2 As shown, the present invention provides a technical solution: a blast furnace jacket gas leakage prevention structure, which includes a sealing shell 301. The sealing shell 301 has an annular structure, and the sealing shell 301 forms a sealing groove with an opening on one side along the axial direction. The cross-section of the sealing groove can be arc-shaped or as shown in the figure. Figure 2 The shape shown contains right angles (or other angles). Specifically, in this embodiment, the sealing shell 301 includes a first annular piece, a second annular piece, and an annular ring. The center lines of the first annular piece, the second annular piece, and the annular ring coincide. The outer side of the first annular piece is fixed to the tuyeres sleeve 1, and its inner side is fixed to the first end of the annular ring. The outer side of the second annular piece is fixed to the blast furnace shell 2, and the inner side of the second annular piece is fixed to the second end of the annular ring.

[0027] It is important to understand that the sealing shell 301 forms a sealed and fixed connection with the tuyeres sleeve 1 and the blast furnace shell 2, respectively. Here, "sealed and fixed" means that there are no gaps at the connection that can leak air. Therefore, the preferred fixing connection method is welding. After welding, magnetic particle testing is used to ensure the airtightness of the weld. Of course, if there are other fixing methods that can ensure that the connection does not leak air, that is also acceptable. The opening of the sealing shell 301 is used to allow the flange connection between the tuyeres sleeve 1 and the blast furnace shell 2 to extend into the sealing groove. The sealing shell 301 is mainly used to isolate the flange connection gap 4 between the tuyeres sleeve 1 and the blast furnace shell 2 from the outside of the blast furnace shell 2. A grouting cavity is also formed between the sealing shell 301, the tuyeres sleeve 1, and the blast furnace shell 2. A refractory castable block 303 is set in the grouting cavity. The refractory castable block 303 is used to seal the flange connection gap 4, thereby preventing the gas inside the blast furnace shell 2 from escaping from the flange connection gap 4.

[0028] It is important to clarify that the refractory castable block 303 is cast using blast furnace grout, which is a common material used for blast furnace lining repair during blast furnace production. Therefore, it will not be elaborated on here. The blast furnace grout used in this embodiment is model ZYR-2, in which the specific gravity of alumina is greater than or equal to 65%, and its refractoriness is 1690℃, which meets the usage requirements of the structure of this invention. In order to enable repeated casting, at least one casting pipe 304 is also provided on the sealing shell 301. The casting pipe 304 is connected to the grouting cavity and can be opened and closed. If the sealing effect of the flange connection gap 4 is poor during long-term use, it can be recast through the casting pipe 304 to seal the flange connection gap 4.

[0029] like Figure 2 As shown, during the blast furnace production process, the temperature of the blast furnace shell 2 is relatively high, which in turn leads to a high temperature of the refractory castable block 303. Therefore, a heat insulation layer 302 needs to be set between the sealing shell 301 and the refractory castable block 303. The heat insulation layer 302 can isolate the heat from the refractory castable block 303, thereby effectively preventing the sealing shell 301 from overheating and deforming. The heat insulation layer 302 can be made of any material, as long as it can withstand high temperatures and provide heat insulation. In this embodiment, the heat insulation layer 302 is ceramic refractory fiber cotton, and its thickness is set to about 10mm. It can not only withstand high temperatures, but also has good heat insulation performance, thereby enabling the sealing shell 301 to have a long service life.

[0030] like Figure 3 As shown, during the blast furnace production process, the refractory castable block 303 reaches a high temperature, which causes it to expand in volume. This expansion may cause the weld between the sealing shell 301 and the blast furnace shell 2 to crack. Therefore, multiple wave-shaped sections 305 are provided on the sealing shell 301, arranged along a first direction parallel to the direction of the tensile force at the connection between the sealing shell 301 and the blast furnace shell 2. Figure 2 The wave portion 305 is arc-shaped, but it can also be designed into other shapes. When the refractory castable block 303 expands due to heat, it will exert an outward tension on the sealing shell 301. With the setting of the wave portion 305, when the refractory castable block 303 expands due to heat, the wave portion 305 on the sealing shell 301 will be straightened as the refractory castable block 303 expands, thereby indirectly increasing the volume of the grouting cavity, reducing the tension on the sealing shell 301, and reducing the risk of the weld between the sealing shell 301 and the blast furnace shell 2 being torn.

[0031] As can be seen from the above, the wave body 305 needs to have a certain degree of elasticity. When the tension on the sealing shell 301 is large, the wave body 305 can be straightened. Therefore, in this embodiment, the sealing shell 301 is made of steel plate with a thickness of 14mm and a model of Q345 to ensure that the sealing shell 301 has good strength. The wave body 305 is made of 316L stainless steel to ensure that it has good elasticity. The sealing shell 301 and the wave body 305 are an integral structure. Of course, when other materials with good rigidity and elasticity are used to make the sealing component 3, the sealing shell 301 and the wave body 305 can also be made into an integral structure.

[0032] It is important to understand that during the long-term use of a blast furnace, the atmosphere inside the blast furnace is often under high pressure. This high-pressure gas can be transmitted to the grouting cavity through the flange connection gap 4, which is similar to the volume expansion of the refractory castable block 303. This can cause the weld between the sealing shell 301 and the blast furnace shell 2 to be pulled apart. Therefore, the present invention also provides multiple protective components 5 between the sealing shell 301 and the blast furnace shell 2. The protective components 5 are used to share the tensile force borne by the connection between the sealing shell 301 and the blast furnace shell 2. They mainly counteract the tensile force at the connection by applying pressure to the connection by the sealing shell 301. In another embodiment of the present invention, four protective components 5 are provided, which are evenly spaced along the axial direction of the sealing shell 301.

[0033] Specifically, such as Figure 3 As shown, the protective component 5 includes: a protective element 501, a protective rod 502, and a hinge 503. The protective element 501, the protective rod 502, and the hinge 503 are arranged sequentially along a first direction. The hinge 503 is fixed to the blast furnace shell 2, the protective element 501 is fixed to the sealing shell 301, the first end of the protective rod 502 is connected to the protective element 501, and the second end is hinged to the hinge 503. The protective element 501 is a rigid or elastic sheet structure, preferably made of metal. The protective element and the hinge 503 cause the protective rod 502 to be in a taut state with a tendency to be straightened. The protective rod 502 applies pressure to the connection between the sealing shell 301 and the blast furnace shell 2 through the protective element 501. The advantage of the protective rod 502 being hinged to the blast furnace shell 2 through the hinge 503 is that it can automatically adjust the direction of the applied pressure as the shape of the sealing shell 301 changes, minimizing the tension received at the connection.

[0034] At the same time, it is important to understand that during the installation or long-term use of the protective component 5, an adjustment structure is provided between the protective component 501 and the protective rod 502 to facilitate the adjustment of the applied pressure. The adjustment structure is used to adjust the applied pressure, and the adjustment structure can be of various types. The basic principle of adjustment is that, under the premise that the positions of the protective component 501 and the hinge 503 are fixed, the shorter the length of the protective rod 502 located between the two, the greater the applied pressure. Therefore, the adjustment structure is mainly used to adjust the length of the protective rod 502 between the protective component 501 and the hinge 503.

[0035] Specifically, such as Figure 3 As shown, the adjustment structure includes: an internal threaded sleeve 504, a protective rod 502 that passes through the protective member 501 and forms a sliding connection with the protective member 501, the internal threaded sleeve 504 being screwed to the first end of the protective rod 502, when it is necessary to increase the applied pressure, the internal threaded sleeve 504 can be rotated in the forward direction, and when it is necessary to decrease the applied pressure, the internal threaded sleeve 504 can be rotated in the reverse direction. At the same time, in order to prevent the applied pressure from being too large, which would cause the wave body 305 to be unable to be straightened, and thus cause a large shear force at the sealing shell 301 and the blast furnace shell 2 to be damaged at the connection, the adjustment structure also includes: a telescopic spring 505, the telescopic spring 505 being sleeved with the protective rod 502, and the telescopic spring 505 being located between the internal threaded sleeve 504 and the protective member 501, when the sealing shell 301 is subjected to a large tension, it can overcome the elastic force of the spring and straighten the wave body 305.

[0036] Using the gas leakage prevention structure for the blast furnace tuyeres proposed in this invention, the technical problem of gas leakage in a tuyeres can be solved in about four hours. Furthermore, this structure has been successfully tested and applied internally. The gas leakage problem of the tuyeres of three blast furnaces has been solved using this structure. In subsequent production, all three furnaces have operated stably without any abnormalities, thus avoiding premature decommissioning and overhaul of the blast furnaces due to gas leakage in the tuyeres.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gas-proof structure for a blast furnace jacket, characterized in that, The system includes a sealing shell (301), which has an annular structure and a sealing groove with an opening on one side along the axial direction. The opening of the sealing shell (301) is used to allow the flange connection between the tuyer sleeve (1) and the blast furnace shell (2) to extend into the sealing groove and to seal and fix the sealing shell (301) to the tuyer sleeve (1) and the blast furnace shell (2) respectively, so that the flange connection gap (4) is isolated from the outside of the sealing groove. A grouting cavity is also formed between the sealing shell (301), the tuyer sleeve (1) and the blast furnace shell (2), and a refractory castable block (303) is provided in the grouting cavity. The refractory castable block (303) can seal the flange connection gap (4). A heat insulation layer (302) is also provided between the sealed shell (301) and the refractory castable block (303); The sealing shell (301) is also provided with a plurality of wave body parts (305), which are arranged along a first direction, which is parallel to the direction of the tensile force borne at the connection between the sealing shell (301) and the blast furnace shell (2); the wave body parts (305) are arc-shaped. Multiple protective components (5) are provided between the sealing shell (301) and the blast furnace shell (2). The protective components (5) are used to share the tensile force borne at the connection between the sealing shell (301) and the blast furnace shell (2). The protective component (5) includes: a protective element (501), a protective rod (502), and a hinge (503), wherein the protective element (501), the protective rod (502), and the hinge (503) are arranged sequentially along a first direction; The hinge (503) is fixed to the blast furnace shell (2); The protective component (501) is fixed to the sealing housing (301); The first end of the protective rod (502) is connected to the protective member (501), and the second end is hinged to the hinge member (503). The protective rod (502) applies pressure to the connection between the sealing shell (301) and the blast furnace shell (2) through the protective member (501). The protective member (501) is a rigid or elastic sheet structure.

2. The blast furnace main jacket gas-proof structure according to claim 1, characterized in that, The sealed housing (301) is also provided with at least one casting pipe (304), which is connected to the grouting cavity and can be opened and closed.

3. The blast furnace main jacket anti-leakage structure according to claim 1, characterized in that, The heat insulation layer (302) is ceramic refractory fiber cotton.

4. The blast furnace main jacket gas-proof structure according to claim 1, characterized in that, An adjustment structure is also provided between the protective component (501) and the protective rod (502), which is used to adjust the applied pressure.

5. The blast furnace main jacket gas-proof structure according to claim 4, characterized in that, The adjustment structure includes: an internal threaded sleeve (504) and a telescopic spring (505); The protective rod (502) penetrates the protective member (501) and forms a sliding connection with the protective member (501); The internal threaded sleeve (504) is screwed to the first end of the protective rod (502); The telescopic spring (505) is sleeved with the protective rod (502), and the telescopic spring (505) is located between the internal threaded sleeve (504) and the protective member (501).

6. The blast furnace main jacket gas-proof structure according to claim 1, characterized in that, The sealed housing (301) and the wave body (305) are integrally formed structures.

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