Side-blown spray gun and metallurgical smelting equipment having the same

Abstract

The present invention discloses a side-blowing spray gun and a metallurgical smelting device having the same. The side-blowing spray gun includes a gun head and a gun body. The gun head has a first gas flow channel, a first auxiliary fuel flow channel, and a first cooling gas flow channel that extend along the axial direction and are nested and arranged at intervals from the inside to the outside. One axial end of the gun head is formed with a first flange; the gun body extends along the axial direction, and the gun body has a second gas flow channel, a second auxiliary fuel flow channel, and a second cooling gas flow channel that extend along the axial direction and are nested and arranged at intervals from the inside to the outside. One end of the gun body facing the gun head is formed with a second flange. Among them, the gun head and the gun body are connected through the first flange and the second flange. According to the side-blowing spray gun of the present invention, it can not only extend the working life of the gun head, improve the safety of smelting production, but also facilitate the replacement and maintenance of the gun head.

Description

Technical Field

[0001] The present invention relates to the technical field of metallurgical smelting, and in particular to a side-blown lance and a metallurgical smelting device having the same. Background Art

[0002] It is pointed out in the related art that in the metallurgical industry, the oxygen-enriched side-blown bath smelting technology, as one of the intensified smelting extraction technologies, is widely used in the smelting of lead ore, copper ore and copper-nickel primary ore due to its strong raw material adaptability, low waste gas emissions, low investment cost and high recovery rate of valuable metals. At the same time, it has also received continuous attention in the comprehensive utilization of renewable resources such as low-content, multi-metal complex materials and "urban mines".

[0003] The side-blown lance, or tuyere device, as a key component of the side-blown bath smelting furnace, blows oxygen-enriched gas and fuel required for the bath reaction or only oxygen-enriched gas into the furnace through the tuyeres on the furnace wall of the furnace chamber to accelerate the rate of oxidation-reduction reaction of the molten material and improve the smelting efficiency. At present, most of the built side-blown smelting furnaces mainly follow the layout of the prototype (Vanyukov) furnace, use copper water jackets for splicing and cooling, and only blow oxygen-enriched gas, resulting in difficulty in maintaining the thermal balance of the melt, causing the bath in the tuyere area to easily form furnace knots, requiring frequent manual poking of the tuyeres, with high labor intensity. In addition, the directly blown oxygen-enriched gas and the regional melt are prone to local peroxidation, resulting in the phenomenon of foamy slag, threatening safety in production. That is, the oxygen enrichment rate in the furnace should not be too high. In addition, once the tuyere device cooled by the water jacket is damaged and leaks water or breaks the flow, it is extremely easy to cause a furnace explosion accident, and the lives of production operators will be difficult to guarantee. At the same time, it will affect the normal furnace operation period, resulting in poor continuity of the production process and causing significant economic losses. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. For this reason, the present invention provides a side-blown lance, which can improve the safety in the smelting production process and at the same time improve the smelting efficiency.

[0005] The present invention also provides a metallurgical smelting device having the above side-blown lance.

[0006] According to a first aspect of the present invention, the side-blowing spray gun comprises: a gun head, the outer contour of the gun head is a column extending along the axis, the gun head has a first gas flow channel, a first auxiliary fuel flow channel and a first cooling gas flow channel extending in the axial direction, the first gas flow channel, the first auxiliary fuel flow channel and the first cooling gas flow channel are nested in sequence from the inside to the outside in the radial direction of the gun head and are arranged at intervals, and a first flange is formed at one axial end of the gun head; a gun body, the gun body extends axially, the gun body has a second gas flow channel, a second auxiliary fuel flow channel and a second cooling gas flow channel extending in the axial direction, the second gas flow channel, the second auxiliary fuel flow channel and the second cooling gas flow channel are nested in sequence from the inside to the outside in the radial direction of the gun body and are arranged at intervals, and a second flange is formed at one end of the gun body facing the gun head, wherein the gun head and the gun body are connected by the first flange and the second flange, and the first gas flow channel is connected to the second gas flow channel, the first auxiliary fuel flow channel is connected to the second auxiliary fuel flow channel, and the first cooling gas flow channel is connected to the second cooling gas flow channel.

[0007] According to the side-blowing spray gun of the present invention, the gun head is detachably connected to the gun body and the cooling gas flow channel is integrated into the gun body, so that the side-blowing spray gun can spray cooling gas to cool the gun head while spraying fuel gas and combustion-supporting gas. This can extend the working life of the gun head, improve the safety of smelting production, and facilitate replacement and maintenance of the gun head.

[0008] According to some embodiments of the present invention, the gun head is a refractory stainless steel casting.

[0009] According to some embodiments of the present invention, a first sealing gasket is provided between the first flange and the second flange, and the first sealing gasket is a copper piece.

[0010] According to some embodiments of the present invention, in a direction from the first flange toward the other axial end of the gun head, a flow cross-sectional area of ​​at least one of the first fuel gas flow channel, the first auxiliary fuel flow channel, and the first cooling gas flow channel gradually decreases.

[0011] According to some embodiments of the present invention, the side-blowing spray gun further comprises: a combustion nozzle, which is arranged in the first gas flow channel and located at an end of the first gas flow channel away from the first flange, and the inner side of the combustion nozzle defines a jet flow channel with a gradually decreasing flow cross-section.

[0012] In some embodiments, the gun body includes a central gas pipe, an intermediate combustion-supporting pipe and a cooling gas pipe which are sequentially sleeved from the inside to the outside in the radial direction, and the central gas pipe, the intermediate combustion-supporting pipe and the cooling gas pipe are coaxially arranged.

[0013] Further, one end of the central gas pipe facing the lance tip extends into the lance tip, and an inner side of one end of the central gas pipe located within the lance tip defines the first gas flow passage.

[0014] According to some embodiments of the present invention, a cooling inlet pipe is connected to the peripheral wall of the cooling gas pipe; an installation opening penetrating the cooling gas pipe is formed on the peripheral wall of the cooling gas pipe, a fuel assistant inlet pipe is connected to the peripheral wall of the intermediate combustion-supporting pipe, and the fuel assistant inlet pipe passes through the cooling gas pipe from the installation opening and is sealingly connected to the peripheral edge of the installation opening.

[0015] Further, in the direction from the inside to the outside along the radial direction, the fuel assistant inlet pipe extends obliquely outward in a direction away from the lance tip, and an included angle between the central axis of the fuel assistant inlet pipe and the central axis of the intermediate combustion-supporting pipe is between 0° and 90°.

[0016] According to some embodiments of the present invention, the lance body further includes: a third flange connected to one end of the cooling gas pipe away from the lance tip; a flange end cover connected to the third flange, and the flange end cover plugs one end of the cooling gas pipe and the intermediate combustion-supporting pipe where the third flange is located. Wherein, a perforation is formed on the flange end cover, and one end of the central gas pipe away from the lance tip passes through the perforation and is sealingly connected to the peripheral edge of the perforation.

[0017] Further, a second sealing gasket is provided between the third flange and the flange end cover, and the second sealing gasket is a copper piece.

[0018] The metallurgical smelting equipment according to the second aspect of the present invention includes: a smelting furnace, an insertion opening is formed on the side wall of the smelting furnace; the side blow lance according to the first aspect of the present invention, the side blow lance is inserted into the smelting furnace from the insertion opening.

[0019] According to the metallurgical smelting equipment of the present invention, by providing the side blow lance of the first aspect, the safety in the metal smelting production process can be improved, the heat utilization efficiency of the fuel gas and the combustion-supporting gas can also be improved, and at the same time, the service life of the equipment can be extended to a certain extent.

[0020] The additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of a side blow lance according to an embodiment of the present invention;

[0022] Figure 2 is Figure 1Schematic diagram of the nozzle head of the side-blowing spray gun shown in

[0023] Figure 3 Make Figure 2 Schematic diagram of the nozzle of the nozzle head shown in

[0024] Reference numerals:

[0025] Side-blowing spray gun 100:

[0026] Nozzle head 1, first gas flow channel 11, first auxiliary fuel flow channel 12, first cooling gas flow channel 13, first flange 14,

[0027] Gun body 2, central gas pipe 21, second gas flow channel 211, intermediate combustion-supporting pipe 22, second auxiliary fuel flow channel 221, auxiliary fuel inlet pipe 222, cooling gas pipe 23, second cooling gas flow channel 231, cooling inlet pipe 232, second flange 24, first sealing gasket 3, combustion nozzle 4, injection flow channel 41, gas injection hole 42,

[0028] Third flange 5, flange end cover 6, second sealing gasket 7. Detailed implementation mode

[0029] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0030] Next, refer to Figures 1 to 3 Describe the side-blowing spray gun according to the embodiment of the first aspect of the present invention.

[0031] As Figure 1 shown, the side-blowing spray gun 100 according to the first aspect of the present invention includes: a nozzle head 1 and a gun body 2.

[0032] Specifically, the outer contour of the nozzle head 1 is columnar extending along the axis. The nozzle head 1 has a first gas flow channel 11, a first auxiliary fuel flow channel 12, and a first cooling gas flow channel 13 inside. The first gas flow channel 11, the first auxiliary fuel flow channel 12, and the first cooling gas flow channel 13 all extend along the axial direction of the nozzle head 1. The first gas flow channel 11, the first auxiliary fuel flow channel 12, and the first cooling gas flow channel 13 are nested and arranged at intervals in the radial direction of the nozzle head 1 from the inside to the outside. One end of the nozzle head 1 along the axial direction (for example Figure 1 the rear end of the nozzle head 1 shown in

[0033] The gun body 2 extends along the axial direction. Inside the gun body 2, there are a second gas flow channel 211, a second auxiliary fuel flow channel 221, and a second cooling gas flow channel 231. The second gas flow channel 211, the second auxiliary fuel flow channel 221, and the second cooling gas flow channel 231 all extend along the axial direction of the gun body 2. The second gas flow channel 211, the second auxiliary fuel flow channel 221, and the second cooling gas flow channel 231 are nested and arranged at intervals from the inside to the outside in the radial direction of the gun body 2. One end of the gun body 2 facing the gun head 1 (for example Figure 1 the front end of the gun body 2 shown in

[0034] ) forms a second flange 24. Wherein, the gun head 1 and the gun body 2 are connected through the first flange 14 and the second flange 24, and the first gas flow channel 11 is communicated with the second gas flow channel 211, the first auxiliary fuel flow channel 12 is communicated with the second auxiliary fuel flow channel 221, and the first cooling gas flow channel 13 is communicated with the second cooling gas flow channel 231. Figure 1 Thus, after the gun head 1 and the gun body 2 are assembled, in the axial direction of the gun head 1 and the gun body 2, gas (such as coal gas or natural gas) can smoothly flow through the first gas flow channel 11 and the second gas flow channel 211 in sequence, and finally spray out from the other end of the gun head 1 (for example

[0035] the front end of the gun head 1 shown in

[0036] ); the combustion-supporting gas (such as oxygen-enriched gas) can smoothly flow through the first auxiliary fuel flow channel 12 and the second auxiliary fuel flow channel 221 in sequence, and finally spray out from the other end of the gun head 1; the cooling gas (such as nitrogen or compressed cooling air) can smoothly flow through the first cooling gas flow channel 13 and the second cooling gas flow channel 231 in sequence, and finally spray out from the other end of the gun head 1. In this way, on the one hand, the side-blowing spray gun 100 of the present embodiment, through integrating the cooling gas flow channel, enables the cooling gas to be continuously introduced when the side-blowing spray gun 100 works, which is beneficial to protecting the gun head 1 from slag hanging during the operation of the spray gun, reducing the thermal damage of the high-temperature melt in the furnace to the gun head 1. At the same time, compared with the way of using water cooling in the related art to cool the gun head 1, it can prevent the furnace explosion accident caused by the burnout, water leakage or interruption of the flow, and improve the safety of production; in addition, the cooling gas can also play a role in diluting the oxygen-enriched combustion-supporting gas to a certain extent, preventing the oxygen-enriched combustion-supporting gas from reacting with the regional melt to produce local peroxidation and generating foamed slag, thus threatening the safety of production; on the other hand, the gun head 1 and the gun body 2 are detachably connected through the first flange 14 and the second flange 24, which can facilitate the replacement when the gun head 1 is damaged, blocked or the like due to the erosion of the metal melt and slag in the furnace, thereby improving the continuity of the production process and not affecting the overall furnace period.According to the side-blowing spray gun 100 of the present invention, by detachably connecting the gun head 1 to the gun body 2 and integrating the cooling gas flow channel on the gun body 2, the side-blowing spray gun 100 can spray cooling gas while spraying fuel gas and combustion-supporting gas to cool the gun head 1. Thus, it can not only extend the working life of the gun head 1, improve the safety of smelting production, but also facilitate the replacement and maintenance of the gun head 1.

[0037] It should be noted that there are no special restrictions on the length and width of the gun head and gun body of the side-blowing spray gun, and they can be reasonably set according to the size of the side-blowing nozzle on the side wall of the smelting furnace. This is understandable and easy for those of ordinary skill in the art, so it will not be elaborated here.

[0038] According to some embodiments of the present invention, the gun head 1 is a refractory stainless steel casting. For example, the gun head 1 can be one of 310S, 316L, or 904L, or a combination of at least two of them. Thus, the working life of the gun head 1 in a high-temperature working environment in this embodiment can be extended.

[0039] According to some embodiments of the present invention, a first sealing gasket 3 is provided between the first flange 14 and the second flange 24. The first sealing gasket 3 is a copper piece. Thus, the sealing performance at the connection between the first flange 14 and the second flange 24 can be improved to prevent air leakage.

[0040] According to some embodiments of the present invention, in the direction from the first flange 14 towards the other axial end of the gun head 1 (for example Figure 1 the direction from back to front as shown), the cross-sectional area of at least one of the first fuel gas flow channel 11, the first combustion-supporting fuel flow channel 12, and the first cooling gas flow channel 13 gradually decreases. That is to say, it can be the cross-sectional area of the first fuel gas flow channel 11 that gradually decreases, or the cross-sectional area of the first combustion-supporting fuel flow channel 12 that gradually decreases, or the cross-sectional area of the first cooling gas flow channel 13 that gradually decreases. Preferably, the cross-sectional areas of the first fuel gas flow channel 11, the first combustion-supporting fuel flow channel 12, and the first cooling gas flow channel 13 all gradually decrease. This can increase the air pressure at the outlet of the gun head 1, thereby increasing the gas flow rate.

[0041] According to some embodiments of the present invention, referring to Figure 1 and Figure 2 , the side-blowing spray gun 100 may further include: a combustion nozzle 4. Specifically, the combustion nozzle 4 is provided in the first fuel gas flow channel 11 and is located at the end of the first fuel gas flow channel 11 away from the first flange 14. The inner side of the combustion nozzle 4 defines a spray flow channel 41 with a gradually decreasing cross-sectional area. In this way, the fuel gas pressure and flow rate at the outlet of the gun head 1 can be increased, the melt stirring ability is improved, and the oxidation-reduction reaction in the smelting process is promoted. For example Figure 1As shown, the cross-sectional area of each part of the first gas flow path 11 in the axial direction can be a constant value. The combustion nozzle 4 is embedded at the front end of the first gas flow path 11. The inner side of the combustion nozzle 4 defines a jet flow path 41. In the direction from the rear to the front along the axis, the cross-sectional area of the jet flow path 41 gradually decreases.

[0042] Furthermore, a plurality of gas spray holes 42 are formed in the peripheral wall of the combustion nozzle 4. The plurality of gas spray holes 42 are arranged at intervals in the circumferential direction of the combustion nozzle 4. The gas spray holes 42 can penetrate the peripheral wall of the combustion nozzle 4 in the axial direction of the combustion nozzle 4. This can make the gas spray out more evenly and also make the gas ejection volume per unit time larger, so that the mixed jet ejected from the gun head 1 can stir the melt around the gun head 1, improving the heat transfer effect and the smelting reaction rate.

[0043] In some embodiments, referring to Figure 1 , the gun body 2 includes a central gas pipe 21, an intermediate combustion-supporting pipe 22, and a cooling gas pipe 23 that are sequentially sleeved from the inside to the outside in the radial direction. The central gas pipe 21, the intermediate combustion-supporting pipe 22, and the cooling gas pipe 23 are coaxially arranged. This is conducive to the more uniform distribution of the ejected combustion-supporting gas and cooling gas in the circumferential direction, thus achieving a better combustion-supporting and cooling effect. In addition, it also makes the structure simpler and facilitates processing and assembly.

[0044] Furthermore, one end of the central gas pipe 21 facing the gun head 1 (for example, Figure 1 the left end of the central gas pipe 21 shown in

[0045] enters the gun head 1, and the inner side of the end of the central gas pipe 21 located inside the gun head 1 defines the first gas flow path 11. This can make the structure of the first gas flow path 11 simpler and the sealing performance better. Figure 1 According to some embodiments of the present invention, referring to

[0046] Furthermore, referring to Figure 1, in the radially inward-to-outward direction, the auxiliary fuel inlet pipe 222 extends obliquely outward in a direction away from the gun head 1. The angle between the central axis of the auxiliary fuel inlet pipe 222 and the central axis of the intermediate combustion-supporting pipe 22 is between 0° and 90°. For example, the angle between the central axis of the auxiliary fuel inlet pipe 222 and the central axis of the intermediate combustion-supporting pipe 22 can be 10°, 30°, 45°, 60° or 90°. This is beneficial to reducing the wind resistance when the combustion-supporting gas enters the intermediate combustion-supporting pipe 22 from the auxiliary fuel inlet pipe 222. Preferably, the auxiliary fuel inlet pipe 222 and the intermediate combustion-supporting pipe 22 are connected at an arc angle, thereby further reducing the wind resistance at the connection.

[0047] Similarly, in the radially inward-to-outward direction, the cooling inlet pipe 232 can extend obliquely outward in a direction away from the gun head 1. The angle between the central axis of the cooling inlet pipe 232 and the central axis of the cooling gas pipe 23 is between 0° and 90°. For example, the angle between the central axis of the cooling inlet pipe 232 and the central axis of the cooling gas pipe 23 can be 10°, 30°, 45°, 60° or 90°. This is beneficial to reducing the wind resistance when the cooling gas enters the cooling gas pipe 23 from the cooling inlet pipe 232. Preferably, the cooling inlet pipe 232 and the cooling gas pipe 23 are connected at an arc angle, thereby further reducing the wind resistance at the connection.

[0048] According to some embodiments of the present invention, the gun body 2 may further include: a third flange 5 and a flange end cover 6. Specifically, the third flange 5 is connected to one end of the cooling gas pipe 23 away from the gun head 1 (for example, Figure 1 the right end of the cooling gas pipe 23 shown in Figure 1 ). The flange end cover 6 is connected to the third flange 5, and the flange end cover 6 seals the ends of the cooling gas pipe 23 and the intermediate combustion-supporting pipe 22 where the third flange 5 is located (for example,

[0049] the right ends of the cooling gas pipe 23 and the intermediate combustion-supporting pipe 22 shown in

[0050] ). A perforation is formed on the flange end cover 6, and one end of the central gas pipe 21 away from the gun head 1 passes through the perforation and is hermetically connected to the periphery of the perforation. Thus, the air supply of the cooling gas pipe 23, the intermediate combustion-supporting pipe 22 and the central gas pipe 21 does not interfere with each other and has good sealing performance, and the structure is also simple, facilitating assembly and maintenance.

[0049] Furthermore, a second sealing gasket 7 is provided between the third flange 5 and the flange end cover 6. The second sealing gasket 7 is made of copper, which can further improve the connection sealing performance between the third flange 5 and the flange end cover 6.

[0050] Next, the metallurgical melting equipment according to the second aspect of the present invention will be described.

[0051] The metallurgical smelting equipment according to the second aspect of the present invention includes a smelting furnace and the side-blown lance 100 according to the first aspect of the present invention. An insertion opening is formed on the side wall of the smelting furnace, and the side-blown lance 100 is inserted into the smelting furnace from the insertion opening.

[0052] For the metallurgical smelting equipment according to the present invention, by providing the side-blown lance 100 of the above first aspect, the safety in the metal smelting production process can be improved, the heat utilization efficiency of the fuel gas and the combustion-supporting gas can also be improved, and the service life of the equipment can be extended to a certain extent.

[0053] The working method of the side-blown lance 100 according to an embodiment of the present invention is described below.

[0054] When using the side-blown lance 100 for side-blown smelting of copper-containing secondary waste, insert the side-blown lance 100 into the furnace from the insertion opening on the side wall of the side-blown smelting furnace, and adjust the gun head 1 to be inserted into the melt by 10 - 1000 mm. Then open the combustion-supporting gas tuyere regulating valve, the fuel gas tuyere regulating valve, and the cooling gas tuyere regulating valve, and control the air flow source pressure at 0.07 - 1.2 MPa.

[0055] Adjust the valve opening of the cooling gas sealing regulating valve to 5 - 30%. By increasing the cooling gas flow rate, make the temperature of the surface layer of the gun head 1 lower than the temperature of the melt layer. At this time, part of the melt will condense and deposit. At this time, on the basis of the original valve opening, adjust the valve opening of the fuel gas tuyere regulating valve to 5 - 20%, and adjust the valve opening of the combustion-supporting gas tuyere regulating valve to 5 - 30% to melt the slag-deposited part of the deposited layer.

[0056] Then increase the valve opening of the cooling gas regulating valve by 5 - 30% to perform the second layer of slag deposition, and repeat the above actions; when the oxygen enrichment rate in the furnace, the shape and size of the muzzle flame are all normal, end the slag deposition operation and perform normal blowing operation. When the gun head 1 is damaged by burning or during furnace shutdown for maintenance, replace or maintain the side-blown lance 100.

[0057] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0058] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0059] In the present invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0061] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A side-blowing spray gun, characterized in that, include: A gun head, wherein the outer contour of the gun head is in the shape of a column extending along the axis, wherein the gun head has a first fuel gas flow channel, a first auxiliary fuel flow channel and a first cooling gas flow channel extending in the axial direction, wherein the first fuel gas flow channel, the first auxiliary fuel flow channel and the first cooling gas flow channel are sequentially nested and spaced apart from the inside to the outside in the radial direction of the gun head, and a first flange is formed at one axial end of the gun head; A gun body, the gun body extends axially, and has a second fuel flow channel, a second fuel-aid flow channel, and a second cooling gas flow channel extending in the axial direction in the gun body, the second fuel flow channel, and the second cooling gas flow channel are sequentially nested and spaced apart from the inside to the outside in the radial direction of the gun body, and a second flange is formed at one end of the gun body facing the gun head, The gun head and the gun body are connected through the first flange and the second flange, a first sealing gasket is provided between the first flange and the second flange, the first gas flow channel is connected to the second gas flow channel, the first auxiliary fuel flow channel is connected to the second auxiliary fuel flow channel, and the first cooling gas flow channel is connected to the second cooling gas flow channel; In the direction from the first flange toward the other axial end of the gun head, the flow cross-sectional area of ​​at least one of the first fuel gas flow channel, the first auxiliary fuel flow channel and the first cooling gas flow channel gradually decreases; The gun body comprises a central gas pipe, an intermediate combustion-supporting pipe and a cooling gas pipe which are sequentially sleeved from the inside to the outside in the radial direction, and the central gas pipe, the intermediate combustion-supporting pipe and the cooling gas pipe are coaxially arranged; One end of the central gas pipe facing the gun head extends into the gun head, and the inner side of one end of the central gas pipe located in the gun head defines the first gas flow channel.

2. The side-blowing spray gun according to claim 1, wherein The gun head is a refractory stainless steel casting.

3. The side-blowing spray gun according to claim 1, wherein The first sealing gasket is a copper piece.

4. The side-blowing spray gun according to claim 1, characterized in that, Also includes: A combustion nozzle is arranged in the first gas flow channel and is located at an end of the first gas flow channel away from the first flange, and the inner side of the combustion nozzle defines a jet flow channel with a gradually decreasing flow cross section.

5. The side-blowing spray gun according to claim 1, characterized in that, A cooling inlet pipe is connected to the peripheral wall of the cooling gas pipe; An installation opening penetrating the cooling gas pipe is formed on the peripheral wall of the cooling gas pipe, and a fuel inlet pipe is connected to the peripheral wall of the intermediate combustion-supporting pipe. The fuel inlet pipe passes through the cooling gas pipe from the installation opening and is sealed to the peripheral edge of the installation opening.

6. The side-blowing spray gun according to claim 5, wherein, In the radial direction from inside to outside, the auxiliary fuel inlet pipe extends outwardly in a direction away from the gun head, and the angle between the centerline axis of the auxiliary fuel inlet pipe and the central axis of the middle auxiliary fuel pipe is between 0° and 90°.

7. The side-blowing spray gun according to claim 5, characterized in that, The gun body also includes: a third flange, the third flange being connected to an end of the cooling gas pipe facing away from the gun head; A flange end cover, the flange end cover is connected to the third flange, and the flange end cover blocks the cooling gas pipe and the intermediate combustion-supporting pipe at one end where the third flange is located, Wherein, a through hole is formed on the flange end cover, and the end of the central gas pipe which is away from the gun head passes through the through hole and is sealed and connected to the periphery of the through hole.

8. The side-blowing spray gun according to claim 7, characterized in that, A second sealing gasket is provided between the third flange and the flange end cover, and the second sealing gasket is a copper piece.

9. A metallurgical smelting device, characterized in that, include: A smelting furnace, wherein an insertion port is formed on a side wall of the smelting furnace; The side-blowing lance according to any one of claims 1 to 8, wherein the side-blowing lance is inserted into the smelting furnace from the insertion port.

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