Multifunctional top gun head of external mixing cluster jet

Abstract

This utility model discloses a multi-functional top-mounted gun head with an externally mixed, clustered jet design. The gun head body has a first end face, a second end face, and a jetting end face arranged sequentially along the axial direction. The outer diameters of the first end face, second end face, and jetting end face increase sequentially. The gun head body contains a main oxygen injection hole, multiple combustion gas holes, and multiple epoxy holes. The main oxygen injection hole is located at the center of the gun head body and penetrates both the first end face and the jetting end face. The multiple combustion gas holes are arranged circumferentially and located around the main oxygen injection hole, all penetrating both the second end face and the jetting end face. The multiple epoxy holes are arranged circumferentially and located around the combustion gas holes, all communicating with the main oxygen injection hole and penetrating the jetting end face. This utility model uses an outer epoxy coating to encapsulate the inner layer of combustion gas and main oxygen, ensuring thorough mixing and combustion of the combustion gas and main oxygen. This extends the jetting distance of the mixture, increases the flame length, improves baking efficiency, and extends the service life of the gun head.

Description

Technical Field

[0001] This utility model relates to the field of RH refining furnace technology, and in particular to a multi-functional top gun head for external mixing and clustering jets. Background Technology

[0002] The RH refining furnace is one of the mainstream vacuum steelmaking equipment, boasting advantages such as fast processing speed, strong applicability, and excellent degassing effect. It can be used to produce high-quality steels such as silicon steel, bearing steel, and low-carbon steel. The RH refining furnace multi-functional top lance is a device used to blow oxygen, fuel gas, and protective gases (such as nitrogen and argon) into the furnace during steelmaking. It is the core component of the RH vacuum refining equipment and is installed at the top of the vacuum tank. Depending on the oxygen / fuel gas distribution, the RH refining furnace multi-functional top lance is divided into internal mixing multi-functional top lances and external mixing multi-functional top lances. The RH refining furnace multi-functional top lance mainly consists of a lance head, lance body, lance tail, and multi-functional sleeve. The lance head is welded from several machined parts and includes a Laval orifice; the lance body consists of four layers of concentric steel pipes, including oxygen channels, fuel gas channels, water inlet channels, water outlet channels, and support blocks between channels; the multi-functional sleeve consists of a sleeve, connectors, and electrical components, used to realize additional functions such as flame detection, automatic ignition, and furnace monitoring of the multi-functional top lance.

[0003] Currently, the top lances used in domestic metallurgical equipment are of the traditional Laval nozzle structure. If the design is unreasonable or the medium parameters are not properly adjusted after oxygen is ejected, it often results in low oxygen utilization and insufficient impact depth. The main root cause of these defects is the short length of the oxygen jet, making it difficult to impact the molten steel surface.

[0004] The clustered jet multifunctional top gun is a new type of top gun developed in recent years. This type of top gun applies the principles of gas mechanics, adding a co-flow system to the traditional top gun to significantly slow down the attenuation rate of the oxygen jet, forming an oxygen jet similar to a laser beam. This jet has concentrated energy and extremely strong penetrating power, showing significant effects on promoting steel-slag reaction, homogenizing molten steel composition and temperature, reducing splashing, improving oxygen utilization, and increasing metal yield. With the application of clustered jet top guns, there are currently two main structures: The first structure has a central gas pipe that passes through a Laval throat, with a gap between the Laval throat and the central gas pipe. The cross-sectional area of ​​this gap is equal to that of the central gas pipe, and several epoxy holes are distributed around the periphery. The main oxygen is ejected from the gap between the gas pipe and the Laval throat. The first structure currently has the following problems: 1. During combustion, it is an internal mixing combustion, and the central main gas pipe is constantly scorched. Due to the thickness of the pipe wall, it is prone to burn-out. 2. The central main oxygen is ejected from the Laval pipe. Due to the presence of the central gas pipe, the main oxygen is dispersed to a certain extent, reducing the impact force of the main oxygen. The second structure has a central main oxygen Laval pipe, with epoxy oxygen holes distributed around it, and epoxy gas holes distributed on the outermost periphery. This structure currently has the following problems: 1. The gas is distributed on the outermost layer, and the main oxygen is wrapped in the inner layer by epoxy, which prevents the gas from fully entering the entrainment area of ​​the main oxygen, resulting in a certain degree of uneven mixing and incomplete combustion. 2. Each gas stream lacks an outer layer protection, resulting in insufficient downward impact force, a short stroke after exiting the nozzle, and a short flame length during combustion, which easily leads to uneven baking and a long baking time. Utility Model Content

[0005] In view of the shortcomings of existing technology, the purpose of this utility model is to provide a multi-functional top gun head for external mixing and clustering jets.

[0006] To achieve the above objectives, the technical solution provided by an embodiment of this utility model is as follows:

[0007] A multi-functional top-mounted nozzle for external mixing and clustering jets includes a nozzle body. The nozzle body has a first end face, a second end face, and a jetting end face arranged sequentially along the axial direction. The outer diameters of the first end face, the second end face, and the jetting end face increase sequentially. The nozzle body is provided with a main oxygen injection hole, multiple gas combustion holes, and multiple epoxy holes. The main oxygen injection hole is located at the center of the nozzle body and penetrates the first end face and the jetting end face. The multiple gas combustion holes are arranged circumferentially and located around the main oxygen injection hole. The multiple gas combustion holes all penetrate the second end face and the jetting end face. The multiple epoxy holes are arranged circumferentially and located around the multiple gas combustion holes. The multiple epoxy holes are all connected to the main oxygen injection hole and all penetrate the jetting end face.

[0008] As a further improvement of this utility model, a branch channel is provided between the epoxy hole and the main oxygen injection hole.

[0009] As a further improvement of this utility model, the angle between the central axis of the branch channel and the central axis of the main oxygen injection hole is 15-35°.

[0010] As a further improvement of this utility model, the main oxygen injection hole is a Laval hole.

[0011] As a further improvement of this utility model, the epoxy hole includes a first cylindrical hole and a first conical hole that are connected to each other. The first conical hole penetrates the ejection end face, and the diameter of the first conical hole gradually increases in the direction close to the ejection end face.

[0012] As a further improvement of this utility model, the gas orifice includes a second cylindrical orifice and a second conical orifice that are connected to each other. The second cylindrical orifice penetrates the second end face, and the second conical orifice penetrates the ejection end face. The diameter of the second conical orifice gradually increases in the direction closer to the ejection end face.

[0013] As a further improvement of this utility model, the ejection end face is planar.

[0014] As a further improvement of this utility model, the diameter of the circle containing the plurality of gas holes is smaller than the diameter of the circle containing the plurality of epoxy holes.

[0015] As a further improvement of this utility model, a preset hole is provided through the gun head body between the second end face and the ejection end face. The preset hole includes at least one of a first through hole, a second through hole, and a mounting hole.

[0016] As a further improvement of this utility model, the preset hole includes a first through hole, a second through hole, and a mounting hole. The first through hole, the second through hole, and the mounting hole are all located on the same circumference. The diameter of the circle where the first through hole is located is larger than the diameter of the circle where the gas hole is located, and the diameter of the circle where the first through hole is located is smaller than the diameter of the circle where the epoxy hole is located.

[0017] The beneficial effects of this utility model are:

[0018] (1) During baking, the outer epoxy wraps the inner layer of gas and main oxygen, ensuring that the gas and oxygen are fully mixed and burned. At the same time, it extends the spray distance of the mixture of main oxygen and gas to increase the length of the flame, improve the baking effect, reduce baking time, improve baking efficiency, and save energy.

[0019] (2) During oxygen blowing, the outer epoxy wraps around the central main oxygen, extending the spray distance of the main oxygen, increasing the impact force of the central main oxygen during refining, increasing the gun position during oxygen blowing, extending the service life of the gun head, and improving the oxygen blowing effect and refining effect.

[0020] (3) The structure is simple, the processing technology is convenient, it is easy to manufacture, and the cost is reduced.

[0021] (4) This utility model has low manufacturing cost and high product qualification rate, which can reduce the cost of use. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a perspective view of a preferred embodiment of the present invention;

[0024] Figure 2 This is a perspective view of a preferred embodiment of the present invention from another angle;

[0025] Figure 3 This is a front view of a preferred embodiment of the present invention;

[0026] Figure 4 This is a bottom view of a preferred embodiment of the present invention;

[0027] Figure 5 for Figure 4 Sectional view along line AA;

[0028] Figure 6 for Figure 4 BB-direction sectional view;

[0029] In the diagram: 1. Main body of the nozzle; 11. First end face; 12. Second end face; 13. Ejection end face; 15. Main oxygen injection hole; 151. Through hole of the contraction section; 152. Through hole of the transition section; 153. Through hole of the expansion section; 16. Gas combustion hole; 161. Second cylindrical hole; 162. Second conical hole; 17. Epoxy hole; 171. First cylindrical hole; 172. First conical hole; 2. Branch channel; 31. First through hole; 32. Second through hole; 33. Mounting hole. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0031] Please see Figures 1-3 This application discloses an external mixing cluster jet multifunctional top gun head, including a gun head body 1. The gun head body 1 has a first end face 11, a second end face 12, and an ejection end face 13 arranged sequentially along the axial direction. The outer diameters of the first end face 11, the second end face 12, and the ejection end face 13 increase sequentially. The gun head body 1 is provided with a main oxygen injection hole 15, a plurality of gas combustion holes 16, and a plurality of epoxy holes 17. The main oxygen injection hole 15 is located at the center of the gun head body 1 and penetrates the first end face 11 and the ejection end face 13. The plurality of gas combustion holes 16 are arranged in the circumferential direction and are located around the main oxygen injection hole 15. The plurality of gas combustion holes 16 all penetrate the second end face 12 and the ejection end face 13. The plurality of epoxy holes 17 are arranged in the circumferential direction and are located around the plurality of gas combustion holes 16. The plurality of epoxy holes 17 are all connected to the main oxygen injection hole 15 and all penetrate the ejection end face 13.

[0032] The first end face 11 and the second end face 12 are used for welding and fixing with other media pipes, facilitating the entry of oxygen into the main oxygen nozzle 15 and the entry of fuel gas into the fuel gas nozzle 16. At the same time, the main oxygen nozzle 15 is connected to the epoxy nozzle 17, allowing the oxygen branch in the main oxygen nozzle 15 to enter the epoxy nozzle 17. The ejection end face 13 serves as the outlet face for the main oxygen nozzle 15 to eject oxygen, the fuel gas nozzle 16 to eject fuel gas, and the epoxy nozzle 17 to eject oxygen. During baking, multiple epoxy holes 17 are located on the outermost layer, with the fuel gas positioned between the epoxy and the main oxygen. The fuel gas and main oxygen are sprayed out through the outer epoxy layer, preventing outward diffusion and ensuring thorough mixing of the fuel gas and oxygen. This also extends the spray distance of the mixture of main oxygen and fuel gas, increasing the flame length, improving the baking effect, reducing baking time, increasing baking efficiency, and saving energy. Meanwhile, during oxygen blowing, the outer epoxy layer wraps around the central main oxygen, extending the spray distance of the main oxygen, increasing the impact force of the main oxygen, improving the position of the oxygen blowing gun, extending the service life of the gun head, and improving the oxygen blowing effect and refining effect.

[0033] Please see Figures 4-6The main oxygen nozzle 15 is a Laval orifice, which can better generate a supersonic main oxygen jet. Specifically, the main oxygen nozzle 15 includes a converging section through-hole 151, a transition section channel 152, and an expanding section through-hole 153. The converging section through-hole 151 penetrates the first end face 11, and the expanding section through-hole 153 penetrates the ejection end face 13. The diameter of the converging section through-hole 151 gradually decreases in the direction away from the first end face 11, the transition section through-hole 152 is cylindrical, and the expanding section through-hole 153 gradually increases in the direction closer to the ejection end face 13.

[0034] To facilitate the branching of oxygen from the main oxygen nozzle 15 into the epoxy nozzle 17, a branch channel 2 is preferably provided between the epoxy nozzle 17 and the main oxygen nozzle 15. Specifically, a branch channel 2 is provided between the epoxy nozzle 17 and the contraction section through hole 151 to ensure that oxygen can quickly enter the epoxy nozzle 17.

[0035] Preferably, the angle D between the central axis of branch channel 2 and the central axis of main oxygen injection hole 15 is 15-35°. This avoids the oxygen from the main oxygen injection hole 15 directly impacting the wall of epoxy hole 17 due to an excessively large angle, ensuring the kinetic energy of oxygen movement. Simultaneously, it avoids the risk of burn-through due to a thinner hole wall between epoxy and fuel gas / main oxygen due to an excessively small angle, extending service life and preventing interference. Further preferably, the angle D between the central axis of branch channel 2 and the central axis of main oxygen injection hole 15 is 24°.

[0036] Please see Figure 3 , Figure 6 The epoxy orifice 17 includes a first cylindrical orifice 171 and a first conical orifice 172 that are connected to each other. The first conical orifice 172 penetrates through the ejection end face 13, and the diameter of the first conical orifice 172 gradually increases towards the ejection end face 13. The epoxy orifice 17 is configured as an approximate Laval tube structure, which can increase the oxygen ejection distance of the epoxy and further improve the mixing and combustion effect of oxygen and fuel gas.

[0037] Please see Figure 3 , Figure 6 The gas orifice 16 includes a second cylindrical orifice 161 and a second conical orifice 162 that are connected to each other. The second cylindrical orifice 161 penetrates the second end face 12, and the second conical orifice 162 penetrates the ejection end face 13. The diameter of the second conical orifice 162 gradually increases towards the ejection end face 13. The size of the gas orifice 16 can be designed and processed differently according to the type of gas.

[0038] Preferably, the ejector end face 13 is planar. With this configuration, the cross-sections of the gases ejected from the main oxygen injection hole 15, the fuel gas injection hole 16, and the epoxy injection hole 17 are on the same plane, further ensuring that the fuel gas and oxygen are mixed evenly and combusted completely after the gas is ejected.

[0039] Preferably, the diameter of the circle containing the multiple gas holes 16 is smaller than the diameter of the circle containing the multiple epoxy holes 17, which further improves the baking and refining effects.

[0040] A pre-set hole is provided through the main body 1 of the gun head between the second end face 12 and the ejection end face 13. The pre-set hole includes at least one of a first through hole 31, a second through hole 32, and a mounting hole 33. The number of pre-set holes can be changed according to different needs of the gun head. For example, only the first through hole 31, or only the second through hole 32, or only the mounting hole 33, or both the first through hole 31 and the second through hole 32, or both the second through hole 32 and the mounting hole 33, or all of the first through hole 31, the second through hole 32, and the mounting hole 33 are provided.

[0041] In this embodiment, please refer to Figure 4 , Figure 5 The preferred pre-set holes include a first through hole 31, a second through hole 32, and a mounting hole 33, i.e., the first through hole 31, the second through hole 32, and the mounting hole 33 are simultaneously provided. All three holes penetrate the second end face 12 and the ejection end face 13. They are all located on the same circumference. The diameter of the circle containing the first through hole 31 is larger than the diameter of the circle containing the gas combustion hole 16, and smaller than the diameter of the circle containing the epoxy hole 17. This facilitates processing and avoids interference, while ensuring the strength of the nozzle body 1. The first through hole 31 serves as a first reserved channel, facilitating the detection of the combustion flame inside the refining furnace by the flame detector. The second through hole 32 serves as a second reserved channel, facilitating the ignition operation of the igniter inside the refining furnace. The mounting hole 33 facilitates the installation of a camera device to monitor the working status inside the refining furnace. The mounting hole 33 can be a threaded hole. The figure only shows one arrangement of the first through hole 31, the second through hole 32, and the mounting hole 33. The positions of the first through hole 31, the second through hole 32, and the mounting hole 33 can also be changed according to actual needs.

[0042] In this embodiment, the nozzle body 1 is preferably made of metal. Specifically, the nozzle body 1 is made of copper, with a dense internal structure, excellent thermal conductivity, and can also prevent steel from sticking. The main oxygen injection hole 15 is precision machined to a high degree of accuracy. The gas combustion hole 16 and the epoxy hole 17 are made using a special reamer.

[0043] In use, the top lance head is fixed to the top lance body and positioned above the molten steel in the refining furnace. Oxygen enters the main oxygen injection hole 15, and simultaneously, oxygen also enters the epoxy hole 17 through the branch channel 2. Gas enters the gas hole 16, and both oxygen and gas are ejected along the ejection end face 13. During baking, the multiple epoxy holes 17 are located on the outermost periphery, and the gas hole 16 is located between the main oxygen injection hole 15 and the epoxy holes 17. The ejected gas is positioned between the epoxy and the main oxygen, and is ejected through the outer epoxy coating of the inner layer of gas and main oxygen, ensuring thorough mixing of the gas and oxygen. This extends the ejection distance of the mixed gas and main oxygen, resulting in good baking efficiency and effect. Furthermore, during oxygen blowing, the outer epoxy coating of the central main oxygen extends the ejection distance of the main oxygen, increases its impact force, improves the lance position during oxygen blowing, and extends the service life of the lance head.

[0044] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-functional top-mounted gun head for externally mixed and clustered jets, characterized in that, The device includes a nozzle body, which has a first end face, a second end face, and an ejection end face arranged sequentially along the axial direction. The outer diameters of the first end face, the second end face, and the ejection end face increase sequentially. The nozzle body is provided with a main oxygen injection hole, multiple gas combustion holes, and multiple epoxy holes. The main oxygen injection hole is located at the center of the nozzle body and penetrates the first end face and the ejection end face. The multiple gas combustion holes are arranged in a circumferential direction and are located around the main oxygen injection hole. The multiple gas combustion holes all penetrate the second end face and the ejection end face. The multiple epoxy holes are arranged in a circumferential direction and are located around the multiple gas combustion holes. The multiple epoxy holes are all connected to the main oxygen injection hole and all penetrate the ejection end face.

2. The multi-functional top-mounted gun head for externally mixed clustered jets according to claim 1, characterized in that, A branch channel connects the epoxy orifice and the main oxygen injection orifice.

3. The multi-functional top gun head for externally mixed clustered jets according to claim 2, characterized in that, The angle between the central axis of the branch channel and the central axis of the main oxygen injection hole is 15-35°.

4. A multi-functional top-mounted gun head for externally mixed clustered jets according to claim 1 or 3, characterized in that, The main oxygen nozzle is a Laval nozzle.

5. The multi-functional top gun head for externally mixed clustered jets according to claim 1, characterized in that, The epoxy orifice includes a first cylindrical orifice and a first conical orifice that are connected to each other. The first conical orifice penetrates the ejection end face, and the diameter of the first conical orifice gradually increases towards the ejection end face.

6. The multi-functional top gun head for externally mixed clustered jets according to claim 5, characterized in that, The gas orifice includes a second cylindrical orifice and a second conical orifice that are connected to each other. The second cylindrical orifice penetrates the second end face, and the second conical orifice penetrates the ejection end face. The diameter of the second conical orifice gradually increases towards the ejection end face.

7. The multi-functional top gun head for externally mixed clustered jets according to claim 1, characterized in that, The ejection end face is planar.

8. The multi-functional top gun head for externally mixed clustered jets according to claim 1, characterized in that, The diameter of the circle containing the plurality of gas vents is smaller than the diameter of the circle containing the plurality of epoxy vents.

9. The multi-functional top gun head for externally mixed clustered jets according to claim 1, characterized in that, The gun head body has a pre-set hole that extends through it between the second end face and the ejection end face. The pre-set hole includes at least one of a first through hole, a second through hole, and a mounting hole.

10. A multi-functional top-mounted gun head for externally mixed clustered jets according to claim 9, characterized in that, The preset holes include a first through hole, a second through hole, and a mounting hole. The first through hole, the second through hole, and the mounting hole are all located on the same circumference. The diameter of the circle containing the first through hole is larger than the diameter of the circle containing the gas hole, and the diameter of the circle containing the first through hole is smaller than the diameter of the circle containing the epoxy hole.

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