Spray gun for tin smelting top blowing furnace

Abstract

The utility model discloses a spray gun for a tin smelting top-blown furnace. The spray gun comprises a coal injection pipe, a dust conveying pipe, a spray gun pipe and a sleeve air pipe which are arranged at intervals from inside to outside and are sequentially and coaxially sleeved from inside to outside, a first cladding layer is arranged on the outer wall of the top of the coal injection duct; a second cladding layer is arranged on the inner wall, corresponding to the first cladding layer, of the dust conveying pipe; a plurality of guide plates are fixed on the outer wall of the coal injection pipe, and gaps are formed between the peripheral sides of the guide plates and the inner wall of the dust conveying pipe; a third cladding layer is arranged on the periphery of the guide plate; wherein the top end face of the dust conveying pipe is bolted with the bottom end face of the mounting seat; the top outer wall of the dust conveying pipe is bolted with the top end surface of the spray gun pipe; the coal injection pipe is slidably connected to an inner cavity of the dust conveying pipe, and the top end of the coal injection pipe communicates with pulverized coal equipment through a pipeline. According to the utility model, practical demands and experience teaching training in tin smelting production practice are fully combined, existing production equipment is used for transformation, the transformation is minimum, but the effect is remarkable, and the equipment investment cost is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of non-ferrous metal smelting, and more specifically to a lance for a top-blown furnace in tin smelting. Background Art

[0002] In the original tin smelting process, the tin fume and the recycled tin-containing materials generated are first granulated by a granulator, and then conveyed by a belt conveyor to a cylindrical mixer. After being rationally mixed with tin concentrate, they are conveyed to a top-blown furnace for continuous smelting. With the application of the high-efficiency submerged melting technology of dry powder materials in the self-developed top-blown furnace, the existing lance can no longer meet the production requirements.

[0003] The lance is a key component of the top-blown submerged melting furnace. During production, the lance needs to be lowered and inserted into the high-temperature molten bath in the furnace to spray fuel, air or oxygen-enriched air into the furnace and play a role in stirring the molten bath. When the production ends or an emergency furnace shutdown occurs, the lance needs to be lifted out of the furnace. The existing lance is mainly divided into 4 layers, namely the pulverized coal connecting pipe, the dust conveying pipe, the lance barrel and the sleeve air duct. Due to the application of the high-efficiency submerged melting technology of dry powder materials, it is necessary to mix the fume into the lance air, and the dry powder materials such as tin fume need to enter the molten bath from the dust conveying pipe, which results in frequent erosion and leakage of the original pulverized coal connecting pipe and the dust conveying pipe, seriously affecting production.

[0004] Therefore, how to provide a lance for a top-blown furnace in tin smelting with a simple structure and improved wear resistance without changing the original structure is an urgent problem to be solved by those skilled in the art. Content of the Utility Model

[0005] In view of this, the utility model provides a lance for a top-blown furnace in tin smelting, which solves the problem of short service life of the lance in the prior art, improves production efficiency and reduces costs.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A lance for a top-blown furnace in tin smelting, comprising:

[0008] A pulverized coal pipe, a dust conveying pipe, a lance barrel and a sleeve air duct which are arranged at intervals inside and outside, up and down, and coaxially sleeved with each other from inside to outside in sequence;

[0009] A first cladding layer is provided on the outer wall of the top of the pulverized coal pipe; a second cladding layer is provided on the inner wall of the dust conveying pipe corresponding to the first cladding layer; a plurality of flow guiding plates are fixed on the outer wall of the pulverized coal pipe, and there is a gap between the circumferences of the plurality of flow guiding plates and the inner wall of the dust conveying pipe; a third cladding layer is provided on the outer circumference of the flow guiding plate;

[0010] Among them, the top end surface of the dust delivery pipe is bolted to the bottom end surface of the mounting seat; the outer wall of the top of the dust delivery pipe is bolted to the top end surface of the spray gun barrel; the outer wall of the top of the spray gun barrel is bolted to the top end surface of the sleeve air duct, and the pulverized coal pipe is slidably connected to the inner cavity of the dust delivery pipe and its top end is connected to the pulverized coal equipment through a pipeline.

[0011] The beneficial effects of the above technical solution are as follows: the first cladding layer improves the resistance of the pulverized coal pipe to material erosion and high-temperature environment, effectively preventing the rapid wear of the pulverized coal pipe; the second cladding layer improves the wear resistance inside the dust delivery pipe, preventing wear caused by frequent erosion of molten materials; the third cladding layer enables the deflector to maintain a stable working state for a long time in an environment of high temperature and high-speed airflow, effectively improving the service life of the spray gun.

[0012] Preferably, the pulverized coal pipe includes a pulverized coal delivery pipe and a pulverized coal connection pipe. The outer wall of the bottom end of the pulverized coal delivery pipe is welded and fixed to the inner wall of the top end of the pulverized coal connection pipe. The top end of the pulverized coal delivery pipe is connected to the pulverized coal equipment through a hose, and the outer wall of the pulverized coal delivery pipe is surfacing welded to form the first cladding layer. The pulverized coal pipe is designed in two parts and welded and fixed. The first cladding layer formed by surfacing welding on the outer wall of the pulverized coal delivery pipe can form a strong wear-resistant layer on its outer surface, greatly enhancing the resistance of the pulverized coal delivery pipe to material erosion and high-temperature environment, and effectively preventing the rapid wear of the pulverized coal delivery pipe.

[0013] Preferably, the dust delivery pipe includes a dust conveying pipe and a dust connection pipe. The bottom end surface of the dust conveying pipe is fixed to the top end surface of the dust connection pipe. A first connection pipe communicating with its inner cavity is fixed perpendicular to the outer wall of the dust conveying pipe to connect the dust conveying equipment. The inner walls of the dust conveying pipe and the first connection pipe are both surfacing welded to form the second cladding layer;

[0014] Among them, the top end of the dust conveying pipe is bolted to the bottom end surface of the mounting seat through a first connection flange; the pulverized coal connection pipe is coaxially sleeved in the inner cavity of the dust connection pipe, and the deflector is fixed to the outer wall of the pulverized coal connection pipe.

[0015] The beneficial effects of the above technical solution are as follows: the inner wall of the dust conveying pipe is surfacing welded to form a second cladding layer to form a wear-resistant protective layer on the inner surface of the dust conveying pipe, enabling it to maintain a stable working state in a high-temperature and high-pressure environment, avoiding performance degradation and frequent maintenance caused by wear, not only extending the service life, but also enhancing its reliability in an environment of high temperature, high pressure, and airflow containing solid particles.

[0016] Preferably, it further includes a conical connecting pipe. The inner diameter of the soot conveying pipe is larger than that of the soot connecting pipe. The large end of the conical connecting pipe is bolted to the bottom end face of the soot conveying pipe, and the outer wall of the small end is fixedly welded to the inner wall of the top end of the soot connecting pipe. A fourth cladding layer is formed by surfacing welding on the inner wall of the conical connecting pipe. The sum of the lengths of the conical connecting pipe and the soot conveying pipe is equal to the length of the pulverized coal conveying pipe. The conical connecting pipe can optimize the air flow, ensure efficient conveyance of the dust, and fully mix with the smelting materials, thereby improving the efficiency and quality of the smelting process. The formation of the fourth cladding layer by surfacing welding on its inner wall gives its inner surface a wear-resistant protective layer, enabling it to remain in good condition under frequent soot scouring, thus effectively preventing performance degradation caused by wear.

[0017] Preferably, the lance barrel includes an oxygen conveying pipe and an oxygen connecting pipe integrally formed. The inner diameter of the oxygen conveying pipe is larger than that of the oxygen connecting pipe.

[0018] A second connecting pipe communicating with its inner cavity is fixed to the outer wall of the oxygen conveying pipe perpendicular to it to connect the oxygen supply equipment. The top end face of the oxygen conveying pipe is bolted to the bottom end face of the soot conveying pipe through a second connecting flange. The soot connecting pipe is coaxially and spacedly sleeved in the inner cavity of the oxygen connecting pipe. The lance barrel provides oxygen for the combustion of pulverized coal, and the detachable connection method facilitates maintenance.

[0019] Preferably, a third connecting pipe communicating with its inner cavity is fixed to the outer wall of the top end of the sleeve air duct perpendicular to it to connect the air supply equipment. The top end face of the sleeve air duct is bolted to the bottom end face of the oxygen conveying pipe through a third connecting flange. The oxygen conveying pipe is coaxially and spacedly sleeved in the inner cavity of the sleeve air duct, and the length of the oxygen connecting pipe is greater than the length of the sleeve air duct. The sleeve air duct blows air into the top-blown furnace to improve the combustion efficiency.

[0020] Preferably, the first connecting pipe, the second connecting pipe, and the third connecting pipe are located on the same side of the lance. This facilitates connection with external equipment.

[0021] Preferably, the deflector includes a support block and a connecting block. The third cladding layer is formed by surfacing welding on the periphery of the support block. The bottom end of the connecting block is fixed to the top end of the support block, and the top end cross-section of the connecting block is conical for guiding the flow. The third cladding layer formed by stacking on the periphery of the support block of the deflector can ensure that the deflector remains in good condition under the scouring of high-speed air flow and solid particles. The conical connecting block enhances the wear resistance and support ability of the deflector.

[0022] Preferably, the length of the deflector is 200 mm, the width is 10 mm, and the thickness is 28 mm. One side wall in the length direction of the deflector is fixed to the outer wall of the coal injection pipe. This significantly enhances the internal structural stability of the lance.

[0023] Preferably, there are at least two flow guiding plates along the radial direction of the pulverized coal injection pipe, and the axial distance between two adjacent flow guiding plates along the pulverized coal injection pipe is 1.5 m. The multiple flow guiding plates arranged at intervals effectively avoid excessive wear caused by the erosion of high-speed air flow and solid particles, improve the overall operation efficiency of the spray gun, and also provide reliable guarantee for long-term use.

[0024] Through the above technical solutions, compared with the prior art, the utility model discloses a spray gun for a top-blown furnace in tin smelting, which fully combines the practical needs and lessons learned in tin smelting production practice, and uses the existing production equipment for transformation, with minimal changes but significant effects, greatly reducing the equipment investment cost. These improvement measures can not only be directly applied to existing equipment to improve the utilization rate of the original equipment, but also have a simple structural design, which is convenient for maintenance and subsequent promotion. Brief Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model, and for those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0026] Figure 1 It is a cross-sectional view of the spray gun provided by the present utility model;

[0027] Figure 2 It is Figure 1 an enlarged schematic view of part A in

[0028] Figure 3 It is a structural schematic diagram of the pulverized coal conveying pipe provided by the present utility model;

[0029] Figure 4 It is a half-sectional schematic view of the soot conveying pipe provided by the present utility model;

[0030] Figure 5 It is a half-sectional schematic view of the conical connecting pipe provided by the present utility model;

[0031] Figure 6 It is a structural schematic diagram of the flow guiding plate provided by the present utility model.

[0032] Among them,

[0033] 1 - sleeve air duct; 11 - third connecting pipe;

[0034] 2 - spray gun barrel; 21 - oxygen conveying pipe; 22 - oxygen connecting pipe; 23 - second connecting pipe;

[0035] 3 - Dust delivery pipe; 31 - Smoke and dust conveying pipe; 32 - Smoke and dust connecting pipe; 33 - First connecting pipe; 34 - Second cladding layer; 35 - Conical connecting pipe; 36 - Fourth cladding layer;

[0036] 4 - Pulverized coal injection pipe; 41 - Pulverized coal conveying pipe; 42 - Pulverized coal connecting pipe; 43 - First cladding layer;

[0037] 5 - Deflector; 51 - Support block; 52 - Connecting block; 53 - Third cladding layer;

[0038] 6 - First connecting flange; 7 - Second connecting flange; 8 - Third connecting flange. Detailed implementation mode

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] See the attached Figures 1 to 6 , the embodiment of the present invention discloses a spray gun for a top - blown furnace in tin smelting, which reforms the existing spray gun structure. Although the changes are small, it can greatly improve the service life of the spray gun, including:

[0041] The pulverized coal injection pipe 4, the dust delivery pipe 3, the spray gun barrel 2 and the sleeve air duct 1 are arranged at intervals both inside and outside and up and down, and are coaxially sleeved in sequence from inside to outside;

[0042] The outer wall of the top of the pulverized coal injection pipe 4 is provided with a first cladding layer 43; the inner wall of the dust delivery pipe 3 corresponding to the first cladding layer 43 is provided with a second cladding layer 34; a plurality of deflectors 5 are fixed on the outer wall of the pulverized coal injection pipe 4, and there is a gap between the circumferences of the plurality of deflectors 5 and the inner wall of the dust delivery pipe 3; the outer circumference of the deflector 5 is provided with a third cladding layer 53;

[0043] Among them, the top end surface of the dust delivery pipe 3 is bolted to the bottom end surface of the mounting seat; the outer wall of the top of the dust delivery pipe 3 is bolted to the top end surface of the spray gun barrel 2; the outer wall of the top of the spray gun barrel 2 is bolted to the top end surface of the sleeve air duct 1, and the pulverized coal injection pipe 4 is slidably connected in the inner cavity of the dust delivery pipe 3 and its top end is connected to the pulverized coal equipment through a pipeline.

[0044] In order to further optimize the above - mentioned technical solution, the pulverized coal injection pipe 4 includes a pulverized coal conveying pipe 41 and a pulverized coal connecting pipe 42. The bottom outer wall of the pulverized coal conveying pipe 41 is welded and fixed to the top inner wall of the pulverized coal connecting pipe 42. The top end of the pulverized coal conveying pipe 41 is connected to the pulverized coal equipment through a hose, and the outer wall of the pulverized coal conveying pipe 41 is built - up welded to form a first cladding layer 43.

[0045] It should be noted that surfacing is an economical and rapid process for material surface modification. Surfacing is a process of cladding a material with certain properties on the surface of a workpiece by welding. Surfacing is not for connecting workpieces, but for changing the surface properties of workpieces to obtain a cladding layer with special properties such as wear resistance, heat resistance, and corrosion resistance, or for repairing workpieces (restoring the insufficient dimensions caused by severe wear and processing errors of workpieces). The characteristics of surfacing are high bonding strength, good impact resistance, cost savings, good economy, and strong operability. In order to most effectively play the role of the surfacing layer, the surfacing method adopted has less dilution of the base material, a higher deposition rate, and excellent surfacing layer properties, that is, a high-quality, high-efficiency, and low-dilution-rate surfacing technology.

[0046] In this embodiment, the pulverized coal conveying pipe is a DN100 304 stainless steel pipe, and the surfacing height is 3 mm. This treatment method greatly improves the resistance of the coal injection pipe in the material scouring environment. Multi-layer surfacing treatment is carried out with wear-resistant surfacing electrodes, significantly improving its wear resistance, effectively preventing the rapid wear of the pulverized coal conveying pipe, and thus extending its service life.

[0047] Through this treatment, the coal injection pipe can not only maintain stable performance in a harsh working environment, but also significantly reduce the maintenance and replacement frequency caused by wear, improving the overall operating efficiency of the equipment.

[0048] To further optimize the above technical solution, the dust delivery pipe 3 includes a smoke and dust conveying pipe 31 and a smoke and dust connecting pipe 32. The bottom end surface of the smoke and dust conveying pipe 31 is fixed to the top end surface of the smoke and dust connecting pipe 32. A first connecting pipe 33 communicating with its inner cavity is fixed to the outer wall of the vertical smoke and dust conveying pipe 31 to connect the smoke and dust conveying equipment. The inner walls of the smoke and dust conveying pipe 31 and the first connecting pipe 33 are both surfaced to form a second cladding layer 34;

[0049] Among them, the top end of the smoke and dust conveying pipe 31 is bolted to the bottom end surface of the mounting seat through a first connecting flange 6; the pulverized coal connecting pipe 42 is coaxially sleeved in the inner cavity of the smoke and dust connecting pipe 32, and the guide plate 5 is fixed to the outer wall of the pulverized coal connecting pipe 42.

[0050] In this embodiment, the soot conveying pipe and the first connecting pipe are integrally prepared into a tee pipe, which serves to connect the pulverized coal injection pipe, the dust conveying pipe, and the sleeve air duct, ensuring that the pulverized coal and soot are conveyed to the bottom furnace bath along a predetermined path. The tee formed by the soot conveying pipe and the first connecting pipe is made of 316L stainless steel, which has extremely strong corrosion resistance and stability in high-temperature environments, and is particularly suitable for use in harsh industrial environments. The inner wall thereof forms a second cladding layer as a wear-resistant protective layer by using a high-hardness wear-resistant material through a multi-layer surfacing technology. The surfacing height is 3 mm, which significantly enhances the wear resistance of the tee, enabling it to maintain a stable working state in high-temperature and high-pressure environments, and avoiding performance degradation caused by wear and frequent maintenance requirements. Through this treatment, the tee not only extends its service life but also improves its reliability in high-temperature, high-pressure, and gas flow environments containing solid particles. In addition, the presence of the wear-resistant layer greatly reduces the maintenance cost and improves the operating efficiency of the entire system. By performing multi-layer surfacing treatment on the inner wall of the tee, the smooth and stable conveyance of pulverized coal and soot during the conveying process is ensured, thereby further optimizing the overall performance of the dust conveying pipeline.

[0051] Through the above optimization design, the tee at the top of the dust conveying pipe performs excellently in high-temperature, high-pressure, and high-wear working environments, ensuring the efficient conveyance of pulverized coal and soot and providing a reliable guarantee for the long-term stable operation of the system.

[0052] To further optimize the above technical solution, it further includes a tapered connecting pipe 35. The inner diameter of the soot conveying pipe 31 is larger than the inner diameter of the soot connecting pipe 32. The large end of the tapered connecting pipe 35 is bolted to the bottom end face of the soot conveying pipe 31, and the outer wall of the small end is fixedly welded to the inner wall of the top end of the soot connecting pipe 32. A fourth cladding layer 36 is formed by surfacing on the inner wall of the tapered connecting pipe 35. The sum of the lengths of the tapered connecting pipe 35 and the soot conveying pipe 31 is equal to the length of the pulverized coal conveying pipe 41.

[0053] The tapered connecting pipe is designed to optimize the air flow, ensure the efficient conveyance of dust, and fully mix with the smelting materials, thereby improving the efficiency and quality of the smelting process. The tapered connecting pipe is made of 304 stainless steel with a thickness of 4 mm, which not only has good corrosion resistance but also can maintain stable mechanical properties in high-temperature environments. A fourth cladding layer is formed by surfacing on its inner wall as a wear-resistant layer, and the surfacing height is 3 mm. By using special welding materials with high temperature resistance and wear resistance and performing multi-layer surfacing treatment, the wear resistance inside the dust conveying pipe is significantly enhanced, enabling it to remain in good condition under frequent soot scouring, thereby effectively preventing performance degradation caused by wear. The presence of the wear-resistant layer extends the service life of the dust conveying pipe and further improves the operating efficiency of the equipment.

[0054] After testing, the tapered connecting pipe performs excellently in high-temperature and high-wear smelting environments, ensuring the efficient conveyance and full mixing of soot and providing a reliable guarantee for the smelting process.

[0055] To further optimize the above technical solution, the spray gun barrel 2 includes an integrally formed oxygen delivery pipe 21 and an oxygen connection pipe 22, and the inner diameter of the oxygen delivery pipe 21 is larger than that of the oxygen connection pipe 22;

[0056] A second connection pipe 23 communicating with its inner cavity is fixed to the outer wall of the vertical oxygen delivery pipe 21 to connect an oxygen supply device; the top end surface of the oxygen delivery pipe 21 and the bottom end surface of the soot delivery pipe 31 are bolted through a second connection flange 7, and the soot connection pipe 32 is coaxially and spacedly sleeved in the inner cavity of the oxygen connection pipe 22.

[0057] A third connection pipe 11 communicating with its inner cavity is fixed to the top outer wall of the vertical sleeve air duct 1 to connect an air supply device; the top end surface of the sleeve air duct 1 and the bottom end surface of the oxygen delivery pipe 21 are bolted through a third connection flange 8, and the oxygen delivery pipe 21 is coaxially and spacedly sleeved in the inner cavity of the sleeve air duct 1, and the length of the oxygen connection pipe 22 is greater than that of the sleeve air duct 1.

[0058] The sleeve air duct is bolted to the oxygen delivery pipe, and the oxygen connection pipe is inserted into the inner cavity of the sleeve air duct; the oxygen delivery pipe is bolted to the soot delivery pipe, and the flue gas connection pipe is inserted into the inner cavity of the oxygen connection pipe; the pulverized coal connection pipe is inserted into the inner cavity of the flue gas connection pipe, and a spray gun is formed through a multi-layer stacked sleeve structure.

[0059] In this embodiment, to facilitate the connection between the spray gun and external devices, the first connection pipe 33, the second connection pipe 23, and the third connection pipe 11 are located on the same side of the spray gun.

[0060] To further optimize the above technical solution, the deflector 5 includes a support block 51 and a connection block 52, and a third cladding layer 53 is formed by surfacing on the periphery of the support block 51; the bottom end of the connection block 52 is fixed to the top of the support block 51, and the top cross-section of the connection block 52 is conical for guiding the flow.

[0061] The deflector is made of 310 stainless steel plate, has excellent high-temperature resistance and corrosion resistance, and is very suitable for use in high-temperature and harsh environments; a third cladding layer is formed by surfacing on the periphery of the support block of the deflector as a wear-resistant layer, with a surfacing height of 5 mm, and a surfacing material with high hardness and high temperature resistance is used to ensure that the deflector can still maintain a good state under the erosion of high-speed air flow and solid particles; a conical connection block is embedded at the top of the support block, further enhancing the wear resistance and support ability of the blade.

[0062] To further optimize the above technical solution, the deflector 5 has a length of 200 mm, a width of 10 mm, and a thickness of 28 mm, and one side wall in the length direction of the deflector 5 is fixed to the outer wall of the coal injection pipe 4.

[0063] The size of the deflector conforms to the actual usage requirements, significantly enhancing the internal structural stability of the spray gun. The presence of the wear-resistant layer greatly improves the wear resistance of the support blades, effectively avoiding excessive wear caused by the erosion of high-speed airflows and solid particles, thereby extending the service life of the blades and reducing the frequency of maintenance and replacement.

[0064] To further optimize the above technical solution, there are at least two deflectors 5 along the radial direction of the coal injection pipe 4, and the axial distance between two adjacent deflectors 5 along the coal injection pipe 4 is 1.5 m. The purpose of this arrangement is to support the gap between the dust delivery pipe and the coal injection pipe, preventing the spray gun from swaying for a long time due to an excessive gap between the coal injection pipe and the dust delivery pipe during use, thereby causing fracture or detachment.

[0065] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and reference can be made to the description in the method part for related parts.

[0066] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A spray gun for a tin smelting top-blown furnace, characterized in that: include: A coal injection pipe (4), a dust delivery pipe (3), a spray gun pipe (2) and a sleeve air duct (1) are arranged at intervals inside and outside and are coaxially sleeved in sequence from the inside to the outside; The top outer wall of the coal injection pipe (4) is provided with a first cladding layer (43); the inner wall of the dust conveying pipe (3) corresponding to the first cladding layer (43) is provided with a second cladding layer (34); a plurality of guide plates (5) are fixed to the outer wall of the coal injection pipe (4), and there is a gap between the peripheral sides of the plurality of guide plates (5) and the inner wall of the dust conveying pipe (3); the outer periphery of the guide plate (5) is provided with a third cladding layer (53); The top end surface of the dust conveying pipe (3) is bolted to the bottom end surface of the mounting seat; the top outer wall of the dust conveying pipe (3) is bolted to the top end surface of the spray gun pipe (2); the top outer wall of the spray gun pipe (2) is bolted to the top end surface of the sleeve air duct (1); the coal injection pipe (4) is slidably connected to the inner cavity of the dust conveying pipe (3) and its top end is connected to the pulverized coal equipment through a pipeline.

2. The spray gun for a tin smelting top-blown furnace according to claim 1, characterized in that: The coal injection pipe (4) comprises a pulverized coal conveying pipe (41) and a pulverized coal connecting pipe (42); the outer wall of the bottom end of the pulverized coal conveying pipe (41) is welded and fixed to the inner wall of the top end of the pulverized coal connecting pipe (42); the top end of the pulverized coal conveying pipe (41) is connected to the pulverized coal equipment via a hose; the outer wall of the pulverized coal conveying pipe (41) is welded to form the first cladding layer (43).

3. The spray gun for a tin smelting top-blown furnace according to claim 2, characterized in that: The dust conveying pipe (3) comprises a smoke conveying pipe (31) and a smoke connecting pipe (32); the bottom end surface of the smoke conveying pipe (31) is fixed to the top end surface of the smoke connecting pipe (32); a first connecting pipe (33) in communication with the inner cavity of the smoke conveying pipe (31) is fixed perpendicularly to the outer wall of the smoke conveying pipe (31) to connect with a smoke conveying device; the inner walls of the smoke conveying pipe (31) and the first connecting pipe (33) are both welded to form the second cladding layer (34); The top end of the smoke conveying pipe (31) is bolted to the bottom end surface of the mounting seat via a first connecting flange (6); the pulverized coal connecting pipe (42) is coaxially sleeved in the inner cavity of the smoke connecting pipe (32), and the guide plate (5) is fixed to the outer wall of the pulverized coal connecting pipe (42).

4. The spray gun for a tin smelting top-blown furnace according to claim 3, characterized in that: It also comprises a conical connecting pipe (35), the inner diameter of the smoke conveying pipe (31) is larger than the inner diameter of the smoke conveying pipe (32), the large end of the conical connecting pipe (35) is bolted to the bottom end surface of the smoke conveying pipe (31), and the outer wall of the small end is welded and fixed to the inner wall of the top end of the smoke conveying pipe (32); the inner wall of the conical connecting pipe (35) is welded to form a fourth cladding layer (36), and the sum of the lengths of the conical connecting pipe (35) and the smoke conveying pipe (31) is equal to the length of the pulverized coal conveying pipe (41).

5. The spray gun for a tin smelting top-blown furnace according to claim 3, characterized in that: The spray gun tube (2) comprises an oxygen delivery tube (21) and an oxygen connecting tube (22) which are integrally formed, and the inner diameter of the oxygen delivery tube (21) is larger than the inner diameter of the oxygen connecting tube (22); A second connecting pipe (23) is fixed vertically to the outer wall of the oxygen delivery pipe (21) and is in communication with the inner cavity thereof so as to connect to an oxygen supply device; the top end surface of the oxygen delivery pipe (21) is bolted to the bottom end surface of the smoke delivery pipe (31) via a second connecting flange (7), and the smoke connection pipe (32) is coaxially and spacedly sleeved in the inner cavity of the oxygen connection pipe (22).

6. The spray gun for a tin smelting top-blown furnace according to claim 5, characterized in that: A third connecting pipe (11) is fixed vertically to the outer wall of the top end of the sleeve air duct (1) and is in communication with the inner cavity thereof to connect to an air supply device; the top end surface of the sleeve air duct (1) is bolted to the bottom end surface of the oxygen delivery pipe (21) via a third connecting flange (8); the oxygen delivery pipe (21) is coaxially and spacedly sleeved in the inner cavity of the sleeve air duct (1); and the length of the oxygen connecting pipe (22) is greater than the length of the sleeve air duct (1).

7. The spray gun for a tin smelting top-blown furnace according to claim 6, characterized in that: The first connecting pipe (33), the second connecting pipe (23) and the third connecting pipe (11) are located on the same side of the spray gun.

8. The spray gun for a tin smelting top-blown furnace according to claim 1, characterized in that: The guide plate (5) comprises a support block (51) and a connection block (52); the peripheral side of the support block (51) is welded to form the third cladding layer (53); the bottom end of the connection block (52) is fixed to the top end of the support block (51); the top end of the connection block (52) is conical in cross section for guiding.

9. The spray gun for a tin smelting top-blown furnace according to claim 1, characterized in that: The guide plate (5) has a length of 200 mm, a width of 10 mm and a thickness of 28 mm. One side wall of the guide plate (5) in the length direction is fixed to the outer wall of the coal injection pipe (4).

10. The spray gun for tin smelting top-blown furnace according to claim 1, characterized in that: There are no less than two guide plates (5) radially along the coal injection pipe (4), and the axial distance between two adjacent guide plates (5) along the coal injection pipe (4) is 1.5 m.

Images