Efficient and energy-saving V-shaped blowing type rotary stirring spray gun

Abstract

The utility model relates to the technical field of metallurgical industry, and discloses an efficient and energy-saving V-shaped blowing type rotary stirring spray gun which comprises a desulfurizing agent pipe, a cooling pipe and a steel core pipe which are sequentially sleeved from inside to outside, the bottom of the desulfurizing agent pipe is connected with a multi-way flow guide block, the flow guide block is detachably connected with a plurality of desulfurizing agent blowing pipes, and the desulfurizing agent blowing pipes are connected with the cooling pipe. The adjacent desulfurizing agent blowing pipes are arranged in a V shape; the steel core upper pipe sequentially comprises a first rotating part and a second rotating part from top to bottom, a plurality of paddles are arranged in the circumferential direction of the steel core lower pipe, a first distance is formed between each paddle and the desulfurizing agent spraying and blowing pipe, an included angle is formed between each paddle and the axial direction of the steel core pipe, the whole paddles are spiral, and the thickness of each paddle in the axial direction of the steel core pipe is changed. The problem of jamming of a desulfurizing agent pipeline is solved, so that the service life of the rotary stirring spray gun is prolonged, the desulfurization efficiency is improved, the desulfurization effect of the rotary stirring spray gun is improved, and cost reduction, energy conservation and efficiency improvement are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgical industry, in particular to a high-efficiency and energy-saving V-shaped blowing type rotary stirring spray gun. Background Art

[0002] Hot metal desulfurization is a pretreatment process for removing sulfur from molten iron before it enters the steelmaking furnace. It reduces the coke ratio and productivity of continuous steel casting, while also reducing lime consumption and slag production, thereby lowering production costs. It is an essential process in current metallurgical production. Injection desulfurization is widely used in major domestic steel mills due to its advantages, including low equipment costs, easy injection of desulfurizer into the molten iron, and prevention of desulfurizer agglomeration. However, the structural characteristics of the currently used injection lances also present problems such as poor dynamic conditions, a large desulfurization blind spot, difficulty achieving uniform and deep desulfurization, long desulfurization times, and low desulfurization rates.

[0003] In order to improve the above-mentioned shortcomings of desulfurization by injection, major steel mills have developed a method of adding blades to the original spray gun to improve the above-mentioned shortcomings. However, the existing improvements still have the following problems: 1) The stirring blade position is prone to slag adhesion. The residue of the desulfurizer that has not fully reacted with the molten iron accumulates and sticks between the blades. After the spray gun is used more than a dozen times, the entire blade part is bonded into a lump-like structure, causing the paddle spray gun to lose its original stirring function and greatly reducing the utilization rate and desulfurization efficiency of the desulfurizer. After sticking into a lump, the center of gravity of the spray gun changes, increasing the vibration intensity and centrifugal force of the spray gun, and reducing the service life of the spray gun; 2) The desulfurizer pipeline is prone to jamming. The desulfurizer outlet of the current spray gun is mostly a single outlet at the bottom or a horizontal T-shaped outlet. The desulfurizer does not flow smoothly at the outlet position, and the desulfurizer pipeline often jams. This not only greatly affects the desulfurization efficiency and reduces the service life of the rotary spray gun, but also poses a safety hazard.

[0004] Therefore, there is a need in the prior art for improving a high-efficiency and energy-saving blowing rotary stirring spray gun. Utility Model Content

[0005] In view of this, the purpose of the embodiment of the present invention is to propose an efficient and energy-saving V-shaped blowing rotary stirring spray gun, which solves the problems of insufficient strength and rigidity of the existing spray gun steel core structure and easy adhesion of the blades, and based on the gas-powder two-phase flow dynamics theory, creatively and newly designed the desulfurizer blowing pipeline, solves the problem of blocking of the desulfurizer pipeline, thereby increasing the service life of the rotary stirring spray gun, improving the desulfurization efficiency, improving the desulfurization effect of the rotary stirring spray gun, and achieving cost reduction, energy saving and efficiency improvement.

[0006] Based on the above objectives, the embodiment of the present invention provides a high-efficiency and energy-saving V-shaped blowing rotary stirring spray gun, comprising:

[0007] The desulfurizer pipe, cooling pipe and steel core pipe are sequentially sleeved from the inside to the outside. The bottom of the desulfurizer pipe is connected to a multi-way guide block. The guide block is detachably connected to multiple desulfurizer injection pipes. The adjacent desulfurizer injection pipes are arranged in a V shape.

[0008] The steel core tube includes a steel core upper tube and a steel core lower tube. The steel core upper tube includes a first rotating part and a second rotating part from top to bottom. The first rotating part and the second rotating part are set to different cross-sectional shapes. A plurality of blades are arranged along the circumference of the steel core lower tube. The blades are at a first distance from the desulfurizer injection pipe, and the blades have an angle with the axial direction of the steel core tube. The blades are spiral as a whole, and the thickness of each blade along the axial direction of the steel core tube varies.

[0009] In some embodiments, a round-bottomed inverted-conical desulfurization powder anti-blocking cavity is provided in the center of the guide block, 2 to 4 through holes extend from the center of the guide block to the surrounding areas, and there are 2 to 4 desulfurization agent blowing pipes. The desulfurization agent blowing pipes are arranged in a one-to-one correspondence with the through holes of the guide block, and adjacent desulfurization agent blowing pipes are arranged in a V shape, and the V-shaped angle is 180>θ≥120°.

[0010] In some embodiments, a top plate is provided at the upper end of the first rotating part, the cross section of the first rotating part is a square tube, the cross section of the second rotating part is a circular tube, and the steel core lower tube is a seamless steel tube.

[0011] In some embodiments, the steel core upper tube and the steel core lower tube are connected via a flange plate, wherein radial lifting ears are provided on the outer side of the flange plate, and axial lifting ears are provided on the upper side of the flange plate.

[0012] In some embodiments, the outer circumferential surface of the connection between the steel core upper tube and the steel core lower tube is provided with reinforcing ribs uniformly distributed along the circumference.

[0013] In some embodiments, the outer peripheral surface of the steel core lower tube, the core plate of the stirring blade and the outer peripheral surface of the core plate are all provided with a refractory material layer, and a plurality of V-shaped steel bars are welded between the outer peripheral surface of the steel core lower tube and the refractory material layer, and between the outer peripheral surface of the stirring core plate and the refractory material layer.

[0014] In some embodiments, desulfurizer tube outer wall support blocks are provided outside the steel core lower tube. The desulfurizer tube outer wall support blocks are distributed in a circular array along the desulfurizer tube outer wall in the circumferential direction and in a linear array along the desulfurizer tube outer wall in the axial direction.

[0015] In some embodiments, a cooling tube outer wall support block is provided on the outside of the cooling tube. The cooling tube outer wall support block is distributed in a circular array along the outer wall of the cooling tube in the circumferential direction and in a linear array along the outer wall of the cooling tube in the axial direction. A plurality of through holes are provided at the bottom of the cooling tube to connect with the steel core tube to form a cooling cavity.

[0016] In some embodiments, the connection between the steel core tube and the top of the blade is a conical transition with a transition angle of 10<σ≤30°, the angle between the upper surface of the blade and the horizontal plane is 0<η≤30°, and the transition between the steel core tube and the bottom of the blade is also a conical transition with a transition angle of 5<σ≤20°.

[0017] In some embodiments, the first distance is 1 / 3 to 1 / 2 of the length of the steel core tube, and the thickness of each blade increases from bottom to top along the axial direction of the steel core tube.

[0018] The utility model has at least the following beneficial technical effects:

[0019] This utility model patent provides an efficient and energy-saving V-shaped blowing rotary stirring spray gun, which solves the problems of insufficient strength and rigidity of the existing spray gun steel core structure, and vibration and bending of the spray gun; based on the results of fluid dynamics simulation analysis, the spray gun blade structure and the blowing structure are creatively designed, which effectively avoids the problem of sticking together between the stirring blades; further, based on the gas-powder two-phase flow dynamics theory, the utility model creatively designs a new desulfurizer blowing pipeline, solves the problem of blocking of the desulfurizer pipeline, thereby increasing the service life of the rotary stirring spray gun, improving the desulfurization efficiency, and improving the desulfurization effect of the rotary stirring spray gun, achieving cost reduction, energy saving and efficiency improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of an embodiment of a high-efficiency and energy-saving V-shaped blowing rotary stirring spray gun provided by the present utility model;

[0022] Figure 2 The utility model provides a Figure 1 The cross-sectional view of the spray gun along the AA direction;

[0023] Figure 3 The utility model provides a Figure 1 Cross-sectional view of the spray gun in the BB direction;

[0024] Figure 4 The utility model provides a Figure 2 A partial enlarged schematic diagram of the spray gun IV mark;

[0025] Figure 5 The utility model provides a Figure 2 A partial enlarged schematic diagram of the V mark on the spray gun.

[0026] Description of reference numerals:

[0027] 1. Axial lifting lug; 2. Cooling inlet joint; 3. Desulfurizer inlet joint; 4. Cooling cavity upper end sealing plate; 5. Desulfurizer pipe; 6. Steel core pipe upper end top plate; 7. Cooling pipe; 8. Steel core upper pipe; 9. Radial lifting lug; 10. Flange plate; 11. First rib plate; 12. First baffle; 13. Second rib plate; 14. Second baffle; 15. Refractory material layer; 16. Blade; 17. Steel core lower pipe; 18. Cooling cavity lower end sealing plate; 19. Desulfurizer pipe outer wall support block; 20. Cooling pipe outer wall support block; 21. Cooling gas external pipe; 22. Desulfurizer injection pipe; 23. Guide block. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this invention pertains; the terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this invention; for example, the directions or positions indicated by the terms "length", "width", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are for ease of description only and should not be construed as limiting this technical solution.

[0030] The terms "including," "having," and any variations thereof in the specification and claims of this utility model and the accompanying drawings are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the specification and claims of this utility model and the accompanying drawings are used to distinguish between different items, not to describe a particular order. "Multiple" means two or more, unless otherwise expressly specified.

[0031] In the specification and claims of this utility model and the above-mentioned description of the drawings, when an element is referred to as being “fixed to”, “mounted on”, “disposed on” or “connected to” another element, it may be directly or indirectly located on the other element. For example, when an element is referred to as being “connected to” another element, it may be directly or indirectly connected to the other element.

[0032] Furthermore, references to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0033] like Figure 1 The figure shows a schematic diagram of an embodiment of a high-efficiency and energy-saving V-shaped blowing rotary stirring spray gun provided by the utility model. The left figure is a main view, and the right figure is a side view. Figure 2 Based on Figure 1 The sectional view of the spray gun along AA direction, Figure 3 The utility model provides a Figure 1 The cross-sectional view of the spray gun BB direction, Figure 4 The utility model provides a Figure 2 A partial enlarged schematic diagram of the spray gun at the IV mark, the spray gun includes:

[0034] The desulfurizer pipe 5, cooling pipe 7 and steel core pipe are sequentially sleeved from the inside to the outside, such as Figure 3 As shown, a multi-way guide block 23 is connected to the bottom of the desulfurizer pipe 5, and the guide block 23 is detachably connected to multiple desulfurizer injection pipes 22, and adjacent desulfurizer injection pipes 22 are arranged in a V shape;

[0035] The steel core tube includes a top plate 6 at the upper end of the steel core tube, an upper steel core tube 8 and a lower steel core tube 17. The upper steel core tube 8 includes a first rotating part and a second rotating part from top to bottom. The first rotating part and the second rotating part are set to different cross-sectional shapes. A plurality of blades 16 are arranged along the circumference of the lower steel core tube 17. The blades are at a first distance from the desulfurizer injection pipe. The blades 16 have an angle with the axial direction of the lower steel core tube 17. The thickness of the blades 16 along the axial direction of the lower steel core tube 17 varies.

[0036] Furthermore, the top end of the desulfurizer pipe 5 is a desulfurizer inlet joint 3, and the inner hole of the lower end of the desulfurizer inlet joint 3 and the inner hole of the upper end of the desulfurizer pipe 5 are smoothly transitioned and solidified together. Figure 4As shown, the lower end of the desulfurizer pipe 5 is provided with a new anti-blocking desulfurizer guide block 23 with a smooth inner wall transition. The new anti-blocking desulfurizer guide block 23 is located opposite the desulfurizer inlet. A round-bottomed inverted cone-shaped anti-blocking cavity for desulfurization powder is provided in the center of the guide block 23. Two to four through holes extend from the center of the guide block 23. There can be two to four desulfurizer injection pipes 22, each corresponding to the outlet of the new anti-blocking desulfurizer guide block 23. The desulfurizer injection pipes 22 are evenly arranged along the circumference of the desulfurizer pipe 5 and are arranged in a V-shape with the V-shaped angle of 180°>θ≥120°. The desulfurizer inlet of the desulfurizer guide block 23 has a diverging trumpet shape to the anti-blocking cavity, while the anti-blocking cavity to the desulfurizer injection pipe 22 has a contracting trumpet shape, with only a rounded corner and a smooth transition at the connection point. This setting can better solve the problem of desulfurizer blocking, allowing the desulfurizer to enter the molten iron more quickly and evenly, enhancing the reaction efficiency between the desulfurizer and molten iron, and improving the desulfurization effect.

[0037] Furthermore, the steel core tube described in the present invention is welded into two sections, upper and lower, divided into an upper steel core tube 8 and a lower steel core tube 17. The upper steel core tube 8 primarily includes a clamping structure and a rotary drive device, which are fixedly connected by a connecting flange. A top plate 6 is provided at the upper end of the first rotating portion. The cross-section of the first rotating portion is a square tube, while the cross-section of the second rotating portion is a circular tube. The lower steel core tube is a seamless steel tube. The circular portion of the first rotating portion primarily bears radial forces and bending moments, while the square portion of the first rotating portion primarily bears torque. This solves the problem of insufficient strength and rigidity of existing spray gun steel core structures, which causes spray gun vibration and bending. By dividing the steel core tube into an upper steel core tube and a lower steel core tube, and specifically designing the first and second rotating portions to have different shapes, the stress and load during operation are effectively dispersed. The square design of the first rotating portion significantly enhances its ability to resist torque, reduces fatigue damage caused by torque concentration, and thus greatly extends the service life of the steel core tube. At the same time, the circular tube portion is focused on bearing radial forces and bending moments. This specialized structural design allows each component to fully utilize its material properties, making the overall structure more stable and reliable. Furthermore, the design between the first and second rotating parts ensures that stress is more evenly distributed across the entire structure when subjected to external forces, preventing stress concentration. This optimized stress distribution not only increases the structure's load-bearing capacity but also reduces the risk of localized damage caused by stress concentration, further enhancing the safety and reliability of the steel core tube.

[0038] Furthermore, if Figure 2 As shown, the steel core upper tube 8 and the steel core lower tube 17 are connected by a flange plate 10. A radial lifting lug 9 is provided on the outer side of the flange plate 10, and an axial lifting lug 1 is provided on the upper side of the flange plate 10. The lifting lug is used to lift the rotary spray gun when disassembling / installing the rotary spray gun.

[0039] Furthermore, the outer peripheral surface of the connection between the steel core upper tube 8 and the steel core lower tube 17 is provided with reinforcing ribs evenly distributed along the circumference. Figure 2 As shown, a first rib 11 , a first baffle 12 , a second rib 13 and a second baffle 14 are sequentially arranged on the lower circumference of the flange plate 10 .

[0040] Furthermore, the outer peripheral surface of the steel core lower tube 17, the core plate of the stirring blade 16 and the outer peripheral surface of the core plate are all provided with a refractory material layer 15, and a plurality of V-shaped steel bars are welded between the outer peripheral surface of the steel core lower tube 17 and the refractory material layer 15, and between the outer peripheral surface of the stirring core plate and the refractory material layer 15.

[0041] Furthermore, the stirring section is provided with a plurality of stirring blades 16, and the stirring blades 16 are spirally distributed along the circumference on the outer peripheral surface of the steel core tube. A smooth transition is provided between each stirring blade, and the transition can be a smooth transition of an arc, or a transition in other ways such as a hyperbola, to avoid stress concentration at the connection position between the blades, improve the torsional strength of the stirring device blades, and increase their service life. The connection between the steel core tube and the top of the blade is a conical transition, with a transition angle of 10<σ≤30°, and the angle between the upper surface of the blade and the horizontal plane is 0<η≤30°. The transition between the steel core tube and the bottom of the blade is also a conical transition, with a transition angle of 5<σ≤20°.

[0042] The considerations for the setting of the blades are as follows: the blade structure is designed based on the results of flow field simulation analysis. The thickness of the blades along the axial direction of the steel core tube varies, so that the molten iron flow field forms a lower circulation with a faster speed, avoiding the flow dead zone between the blade angles, improving the dynamic conditions of the molten iron, and enhancing the dynamic effect of the upper circulation of the molten iron. Among them, the stirring blade is spiral as a whole, and the side is inclined from bottom to top. This setting not only reduces the adhesion of the blade slag, but also makes the iron-facing / back-iron-facing surface of the spray gun blade form a "long on top and short on the bottom" structure. The different positions of the spray gun blades are coaxial rotation angles. The speed is the same, and the larger the radius, the greater the linear speed. Therefore, during the stirring process, the flow rate of the molten iron around the stirring blade increases continuously from bottom to top along the side of the spray gun blade, so the upper circulation speed of the spray gun blade is faster than the lower circulation. At the same time, because the iron-facing surface is spiral, when the spray gun rotates, the iron-facing surface of the blade exerts a tangential force along the iron-facing surface on the molten iron, which increases the relative flow rate of the molten iron on the blade surface, thereby effectively avoiding the desulfurizer residue from slag sticking between the blades. In addition, a larger fillet is set at the intersection of the iron-facing surface and the circumferential side, so that the molten iron streamline at the angle flows out smoothly in the radial direction, further improving the dynamic conditions there. Furthermore, both the iron-facing surface and the back iron surface are tilted forward from bottom to top, making the side of the stirring blade "wide at the top and narrow at the bottom", which increases the range of activity of the upper circulation, improves the circumferential and radial diffusion capacity of the desulfurizer, effectively extends the floating trajectory of the desulfurizer, and enables the desulfurizer to enter the molten iron more quickly and evenly, thereby enhancing the contact between the desulfurizer and the molten iron and improving the desulfurization effect. After applying the blade with this structure, the flow rate of molten iron on the blade surface is greatly improved, and at the same time, the desulfurizer residue is further prevented from hanging and sticking between the blades.

[0043] Furthermore, if Figure 5 As shown, desulfurizer tube outer wall support blocks 19 are disposed on the exterior of the steel core lower tube 17. The support blocks 19 are arranged in a circular array along the outer wall of the desulfurizer tube 5 in the circumferential direction and in a linear array along the outer wall of the desulfurizer tube 5 in the axial direction. In some embodiments, a gap of 0.2-0.5 mm is maintained between the outer side of the desulfurizer tube outer wall support blocks 19 and the inner wall of the cooling tube.

[0044] Furthermore, if Figure 5As shown, a cooling tube outer wall support block 20 is provided on the outside of the cooling tube 7. The cooling tube outer wall support blocks 20 are distributed in a circular array along the outer wall of the cooling tube in the circumferential direction and in a linear array along the outer wall of the cooling tube in the axial direction. A plurality of guide blocks 23 are provided at the bottom position of the cooling tube 7 to connect with the steel core tube to form a cooling cavity. Furthermore, a cooling gas external pipe 21 can be connected to the inlet of the cooling tube to inflate the cooling cavity. The cooling cavity has a cooling cavity upper end sealing plate 4 and a cooling cavity lower end sealing plate 18. The cooling medium discharge cavity is formed by the inner surface of the steel core tube and the outer surface of the cooling tube 7, and the cooling medium input cavity is formed by the inner surface of the cooling tube 7 and the outer surface of the desulfurizer tube 5. The cooling medium is input from the inlet of the cooling inlet joint 2, enters the input cavity, and then enters the discharge cavity through a plurality of guide holes 24, and is discharged from the upper end outlet of the discharge cavity, thereby realizing the cooling of the rotating stirring steel core.

[0045] Furthermore, the first distance is 1 / 3 to 1 / 2 the length of the steel core tube. Consider appropriately extending the distance between the desulfurizer outlet and the spray gun blades so that the desulfurizer, after being sprayed from the desulfurizer outlet, mixes with the molten iron and fully reacts with the molten iron before reaching the blades. This significantly reduces the chance of desulfurizer residue coming into contact with the blades, effectively preventing the desulfurizer from slagging and clumping between the blades.

[0046] The above are exemplary embodiments disclosed by the present invention, but it should be noted that various changes and modifications can be made without departing from the scope of the disclosure of the embodiments of the present invention as defined in the claims. The functions, steps and / or actions of the method claims according to the disclosed embodiments described herein do not need to be performed in any particular order. In addition, although the elements disclosed in the embodiments of the present invention can be described or required in individual form, they can also be understood as multiple unless expressly limited to the singular.

[0047] It should be understood that, as used herein, the singular forms "a" and "an" are intended to include the plural forms as well, unless the context clearly supports an exception. It should also be understood that, as used herein, "and / or" is intended to include any and all possible combinations of one or more of the associated listed items.

[0048] The serial numbers of the embodiments disclosed in the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0049] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to limit the scope of the disclosure of the present invention (including the claims) to these examples. Based on the principles of the present invention, the technical features of the above embodiments or different embodiments may be combined, and there are many other variations of the various aspects of the above embodiments, which are not provided in detail for the sake of clarity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-efficiency and energy-saving V-shaped spraying rotary stirring spray gun, characterized in that: include: A desulfurizer pipe, a cooling pipe, and a steel core pipe are sequentially sleeved from the inside out. The bottom of the desulfurizer pipe is connected to a multi-way guide block. The guide block is detachably connected to multiple desulfurizer injection pipes. Adjacent desulfurizer injection pipes are arranged in a V shape. The steel core tube includes a steel core upper tube and a steel core lower tube. The steel core upper tube includes a first rotating part and a second rotating part from top to bottom. The first rotating part, the first rotating part and the second rotating part are set to different cross-sectional shapes. A plurality of blades are arranged along the circumference of the steel core lower tube. The blades are at a first distance from the desulfurizer injection pipe, and the blades have an angle with the axial direction of the steel core tube. The blades are spiral as a whole, and the thickness of each blade along the axial direction of the steel core tube varies.

2. The energy-efficient V-shaped spray gun according to claim 1, characterized in that: A round-bottomed inverted-conical desulfurization powder anti-blocking cavity is provided at the center of the guide block, and 2 to 4 through holes extend from the center of the guide block to the surrounding areas. There are 2 to 4 desulfurization agent blowing pipes, and the desulfurization agent blowing pipes are arranged in a one-to-one correspondence with the through holes of the guide block. Adjacent desulfurization agent blowing pipes are arranged in a V shape, and the V-shaped angle is 180>θ≥120°.

3. The energy-efficient V-shaped spray gun according to claim 1, characterized in that: A top plate is provided at the upper end of the first rotating part. The cross section of the first rotating part is a square tube. The cross section of the second rotating part is a circular tube. The steel core lower tube is a seamless steel tube.

4. The energy-efficient V-shaped spray gun according to claim 1, characterized in that: The steel core upper tube and the steel core lower tube are connected via a flange plate. A radial lifting lug is provided on the outer side of the flange plate, and an axial lifting lug is provided on the upper side of the flange plate.

5. The energy-efficient V-shaped spray gun according to claim 1, characterized in that: The outer circumferential surface of the connection between the steel core upper tube and the steel core lower tube is provided with reinforcing ribs evenly distributed along the circumference.

6. The high-efficiency and energy-saving V-shaped blowing rotary stirring spray gun according to claim 1 is characterized in that: The outer circumference of the steel core lower tube, the core plate of the blade and the outer circumference of the core plate are all provided with a refractory material layer, and a plurality of V-shaped steel bars are welded between the outer circumference of the steel core lower tube and the refractory material layer, and between the outer circumference of the core plate and the refractory material layer.

7. The energy-efficient V-shaped spray gun according to claim 1, characterized in that: Desulfurizer tube outer wall support blocks are arranged outside the steel core lower tube. The desulfurizer tube outer wall support blocks are distributed in a circular array along the desulfurizer tube outer wall in the circumferential direction and in a linear array along the desulfurizer tube outer wall in the axial direction.

8. The energy-efficient V-shaped spray gun according to claim 1, characterized in that: A cooling tube outer wall support block is provided on the outside of the cooling tube. The cooling tube outer wall support blocks are distributed in a circular array along the outer wall of the cooling tube in the circumferential direction and in a linear array along the outer wall of the cooling tube in the axial direction. A plurality of through holes are provided at the bottom of the cooling tube to connect with the steel core tube to form a cooling cavity.

9. The energy-efficient V-shaped spray gun according to claim 1, characterized in that: The connection between the steel core tube and the top of the blade is a conical transition with a transition angle of 10<σ≤30°, the angle between the upper surface of the blade and the horizontal plane is 0<η≤30°, and the transition between the steel core tube and the bottom of the blade is also a conical transition with a transition angle of 5<σ≤20°.

10. The high-efficiency and energy-saving V-shaped blowing rotary stirring spray gun according to claim 1, characterized in that: The first distance is 1 / 3 to 1 / 2 of the length of the steel core tube, and the thickness of each blade increases from bottom to top along the axial direction of the steel core tube.

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