Long life erosion resistant dephosphorizing lance

Abstract

This utility model discloses a long-life, corrosion-resistant dephosphorizing spray gun, belonging to the field of iron and steel metallurgical equipment technology. It aims to solve the problems of short lifespan, weak corrosion resistance, and low dephosphorizing efficiency of existing dephosphorizing spray guns. The spray gun includes a gun body shell, a refractory material layer, a central injection channel, an auxiliary cooling channel, and nozzles. The gun body shell has a cylindrical hollow structure, providing stable support. The refractory material layer is tightly bonded to the inner wall of the shell and is divided into an outer transition layer, a middle corrosion-resistant layer, and an inner wear-resistant layer from the outside to the inside. Each layer is connected by an interface binder, effectively resisting high temperature and slag corrosion. The central injection channel is set along the spray gun axis and is used to transport the dephosphorizing agent and carrier gas. The auxiliary cooling channel is distributed around the central injection channel and can be circulated with a cooling medium to reduce the gun body temperature. The nozzle has a double-layer nested structure. The inner nozzle adopts a contraction-expansion type structure to enhance the injection kinetic energy, and the outer nozzle has an annular injection hole, which can both form a cooling air curtain to protect the nozzle and further disperse the dephosphorizing agent.

Description

Technical Field

[0001] This utility model relates to the field of steel metallurgical equipment technology, specifically a long-life anti-corrosion dephosphorization spray gun. Background Technology

[0002] In the refining stage of steelmaking, dephosphorization is a crucial process that determines the purity of molten steel and the quality of subsequent products. The dephosphorization spray gun, as a core component in this process, directly impacts dephosphorization efficiency, production continuity, and equipment maintenance costs. Currently, mainstream dephosphorization spray guns on the market have significant technical shortcomings in practical applications:

[0003] On the one hand, the dephosphorization lances suffer from insufficient resistance to erosion and thermal shock. Operating at high temperatures of 1500-1700℃ for extended periods, they must withstand the intense scouring of molten slag and the chemical erosion of oxidizing components such as FeO and MnO. Furthermore, frequent start-ups and shutdowns cause repeated heating and cooling, easily leading to cracking of the lance body and peeling of the refractory material layer. Existing lances often use a single-material refractory layer, which is insufficient to simultaneously resist scouring, erosion, and thermal shock damage. Their typical service life is only 30-50 heats, requiring frequent shutdowns for replacement, increasing equipment procurement costs and severely impacting steelmaking production schedules.

[0004] On the other hand, unreasonable structural design leads to functional limitations. Some spray guns lack targeted cooling structures, causing the gun body temperature to rise continuously in high-temperature environments, further accelerating the aging of refractory materials. At the same time, traditional nozzles are mostly single-channel designs, resulting in poor dispersion of dephosphorizing agent during spraying and a small contact area with molten steel, leading to incomplete dephosphorization reaction, requiring more dephosphorizing agent to be consumed, and increasing smelting costs.

[0005] Therefore, this utility model provides a long-life anti-erosion dephosphorization spray gun to solve the above problems. Utility Model Content

[0006] To address the shortcomings of existing technologies, this invention provides a long-life anti-corrosion dephosphorization spray gun, which solves the aforementioned problems.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a long-life, anti-corrosion, dephosphorization spray gun, characterized in that it comprises a gun body shell, a refractory material layer, a central spray channel, an auxiliary cooling channel, and a nozzle; the gun body shell is a cylindrical hollow structure, the refractory material layer is tightly adhered to the inner wall of the gun body shell, and the refractory material layer is divided into an outer transition layer, a middle anti-corrosion layer, and an inner wear-resistant layer from the outside to the inside, with each layer tightly connected by an interface binder; the central spray channel is arranged through the spray gun along its axial direction, and the auxiliary cooling channels are evenly distributed around the central spray channel, with 4-6 auxiliary cooling channels; the nozzle is fixed to the lower end of the spray gun, and the nozzle is connected to both the central spray channel and the auxiliary cooling channel.

[0008] Furthermore, the gun body shell is made of Q345R low alloy high strength steel, and the thickness of the gun body shell is 8-12mm.

[0009] Furthermore, the total thickness of the refractory material layer is 30-50mm, wherein the outer transition layer is 15-20mm thick, the middle anti-corrosion layer is 15-20mm thick, and the inner wear-resistant layer is 10mm thick.

[0010] Furthermore, the nozzle has a double-layer nested structure, including an inner nozzle and an outer nozzle; the inner nozzle is connected to the central injection channel, and the outlet end of the inner nozzle has a contraction-expansion type Laval nozzle structure; the outer nozzle is sleeved on the outside of the inner nozzle, and the outer nozzle is connected to the auxiliary cooling channel, and the outlet end of the outer nozzle has an annular injection hole.

[0011] Furthermore, the throat diameter of the inner nozzle is 8-12 mm, and the expansion angle at the outlet end of the inner nozzle is 15-20°.

[0012] Furthermore, the angle between the annular injection hole at the outlet end of the outer nozzle and the axis of the outlet of the inner nozzle is 30-45°.

[0013] Furthermore, the inlet end of the auxiliary cooling channel is connected to a cooling medium supply device, and the outlet end of the auxiliary cooling channel is connected to the annular spray hole of the external nozzle.

[0014] Furthermore, the nozzle is made of dense corundum-silicon nitride composite ceramic, and the bulk density of the composite ceramic is ≥3.6g / cm³, the compressive strength at room temperature is ≥300MPa, and the flexural strength at 1400℃ is ≥50MPa.

[0015] Furthermore, the diameter of the central injection channel is 20-25mm, and the diameter of the auxiliary cooling channel is 8-10mm.

[0016] Furthermore, the length of the gun body shell is 4000-4500mm, and the diameter of the gun body shell is 150-180mm.

[0017] Beneficial effects

[0018] This invention provides a long-life, corrosion-resistant dephosphorization spray gun. Compared with the prior art, it has the following advantages:

[0019] 1. This long-life, corrosion-resistant dephosphorization spray gun, through the synergistic design of the refractory material layer with the gradient composite structure and the double-layer nested cooling nozzle, greatly improves the spray gun's resistance to high-temperature erosion, thermal shock and erosion, and its service life can reach 120-150 furnaces, which is 2-3 times that of existing spray guns, reducing the frequency of equipment replacement and reducing downtime losses and procurement costs.

[0020] 2. This long-life, corrosion-resistant dephosphorizing spray gun features a Laval nozzle structure in the inner nozzle that enhances the spray kinetic energy of the dephosphorizing agent, while the annular spray hole in the outer nozzle enables secondary dispersion of the dephosphorizing agent. The combination of these two features makes the dephosphorizing agent mix more evenly with the molten steel, increasing the dephosphorizing efficiency by 10-15% while reducing the consumption of dephosphorizing agent by 8-12%, thus improving the economics of steelmaking. Attached Figure Description

[0021] 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 of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a perspective view of the external structure of this utility model;

[0023] Figure 2 This is a three-dimensional view of the bottom structure of this utility model;

[0024] Figure 3 This is a top view of the present invention;

[0025] Figure 4 This is an internal cross-sectional view of the present invention.

[0026] In the diagram: 1. Gun body shell; 2. Refractory material layer; 21. Outer transition layer; 22. Middle anti-corrosion layer; 23. Inner wear-resistant layer; 3. Central injection channel; 4. Auxiliary cooling channel; 5. Nozzle; 51. Inner nozzle; 52. Outer nozzle; 53. Annular injection hole. Detailed Implementation

[0027] It should be noted that in the description of the embodiments of this application, the terms "front," "rear," "left," "right," "up," "down," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0028] The present application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0029] Reference Figures 1 to 4 This application provides a long-life anti-corrosion dephosphorization spray gun, characterized in that it includes a gun body shell 1, a refractory material layer 2, a central spray channel 3, an auxiliary cooling channel 4, and a nozzle 5; the gun body shell 1 is a cylindrical hollow structure, the refractory material layer 2 is tightly attached to the inner wall of the gun body shell 1, and the refractory material layer 2 is divided into an outer transition layer 21, a middle anti-corrosion layer 22, and an inner wear-resistant layer 23 from the outside to the inside, and the layers are tightly connected by an interface binder; the central spray channel 3 is arranged through the spray gun axis, and the auxiliary cooling channels 4 are evenly distributed around the central spray channel 3, and the number of auxiliary cooling channels 4 is 4-6; the nozzle 5 is fixed at the lower end of the spray gun, and the nozzle 5 is connected to the central spray channel 3 and the auxiliary cooling channel 4 respectively.

[0030] The gun body shell 1 is made of Q345R low-alloy high-strength steel, and the thickness of the gun body shell 1 is 8-12mm. The total thickness of the refractory material layer 2 is 30-50mm, of which the outer transition layer 21 is 15-20mm thick, the middle anti-corrosion layer 22 is 15-20mm thick, and the inner wear-resistant layer 23 is 10mm thick.

[0031] Nozzle 5 has a double-layer nested structure, including an inner nozzle 51 and an outer nozzle 52. The inner nozzle 51 is connected to the central injection channel 3, and its outlet end has a contraction-expansion type Laval nozzle structure. The outer nozzle 52 is fitted outside the inner nozzle 51 and is connected to the auxiliary cooling channel 4. The outlet end of the outer nozzle 52 has an annular injection hole 53. The throat diameter of the inner nozzle 51 is 8-12 mm, the expansion angle at the outlet end of the inner nozzle 51 is 15-20°, and the angle between the annular injection hole 53 at the outlet end of the outer nozzle 52 and the outlet axis of the inner nozzle 51 is 30-45°. The inlet end of the auxiliary cooling channel 4 is connected to a cooling medium supply device, and the outlet end of the auxiliary cooling channel 4 is connected to the annular injection hole 53 of the outer nozzle 52. The nozzle 5 is made of dense corundum-silicon nitride composite ceramic, with a bulk density ≥3.6g / cm³, a room temperature compressive strength ≥300MPa, and a high-temperature flexural strength ≥50MPa at 1400℃. The diameter of the central injection channel 3 is 20-25mm, and the diameter of the auxiliary cooling channel 4 is 8-10mm. The length of the gun body shell 1 is 4000-4500mm, and the diameter of the gun body shell 1 is 150-180mm.

[0032] In this embodiment,

[0033] Spray gun structural parameters

[0034] Gun body shell 1: Material: Q345R low alloy high strength steel, thickness: 10mm, diameter: 150mm, length: 4000mm;

[0035] Refractory material layer 2: Total thickness 40mm, outer transition layer 21 15mm thick, middle anti-corrosion layer 22 15mm thick, inner wear-resistant layer 23 10mm thick, each layer is connected by Al2O3-SiO2 interface binder.

[0036] Central spray channel 3: 20mm in diameter, running through the center of the spray gun;

[0037] Auxiliary cooling channels 4: There are 4 channels, evenly distributed around the central injection channel 3. Each channel has a diameter of 8mm and its inlet end is connected to an air compressor with a pressure of 0.4MPa.

[0038] Nozzle 5: Double-layer nested structure, inner nozzle 51 with a throat diameter of 10mm and an outlet expansion angle of 18°; outer nozzle 52 with an annular spray hole 53 at the outlet end and an angle of 35° with the outlet axis of inner nozzle 51; the nozzle material is dense corundum-silicon nitride composite ceramic with a bulk density of 3.6g / cm³, a room temperature compressive strength of 300MPa, and a high temperature flexural strength of 50MPa at 1400℃.

[0039] Application scenarios and effects

[0040] The spray gun of this embodiment was applied to the dephosphorization process in a 120t converter steelmaking process. During operation, compressed air at 0.4MPa and a flow rate of 6m³ / h was introduced through the auxiliary cooling channel 4. Actual testing showed that after 135 heats of continuous use, the gun body shell 1 showed no significant deformation, the refractory material layer 2 showed no peeling, and the nozzle 5 showed only 0.35mm wear per 10 heats. The dephosphorization efficiency reached 92.5%, and the dephosphorizing agent consumption was 3.2kg / t of steel. Compared to the existing conventional spray gun with a service life of 42 heats, a dephosphorization efficiency of 83.1%, and a dephosphorizing agent consumption of 3.6kg / t of steel, the overall performance is significantly improved.

[0041] Example 2

[0042] Spray gun structural parameters

[0043] Gun body shell 1: Material: Q345R low alloy high strength steel, thickness: 12mm, diameter: 180mm, length: 4500mm;

[0044] Refractory material layer 2: total thickness 50mm, outer transition layer 21 thickness 20mm, middle anti-corrosion layer 22 thickness 20mm, inner wear-resistant layer 23 thickness 10mm, each layer is connected by Al2O3-SiO2 interface binder;

[0045] Central spray channel 3: 25mm in diameter, running through the center of the spray gun;

[0046] Auxiliary cooling channels 4: There are 6 channels, evenly distributed around the central injection channel 3. Each channel has a diameter of 10mm and its inlet end is connected to an air compressor with a pressure of 0.5MPa.

[0047] Nozzle 5: Double-layer nested structure, inner nozzle 51 with a throat diameter of 12mm and an outlet expansion angle of 20°; outer nozzle 52 with an annular spray hole 53 at the outlet end and an angle of 40° with the outlet axis of inner nozzle 51; the nozzle material is dense corundum-silicon nitride composite ceramic with a bulk density of 3.7g / cm³, a room temperature compressive strength of 320MPa, and a high temperature flexural strength of 55MPa at 1400℃.

[0048] Application scenarios and effects

[0049] The spray gun of this embodiment was applied to the dephosphorization process of a 150t electric arc furnace steelmaking plant. During operation, compressed air at 0.5MPa and a flow rate of 8m³ / h was introduced through the auxiliary cooling channel 4. Actual testing showed that after 148 heats of continuous use, the gun structure remained stable, the refractory material layer 2 showed no erosion or penetration, and the nozzle 5 showed only 0.32mm wear per 10 heats. The dephosphorization efficiency reached 94.2%, and the dephosphorizing agent consumption was 3.0kg / t steel, fully meeting the requirements for high-efficiency dephosphorization and long-cycle operation in large electric arc furnaces.

[0050] Furthermore, all contents not described in detail in this specification are existing technologies known to those skilled in the art, and all electrical components mentioned in this document are powered by external power supply lines.

[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0052] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A long-life, anti-erosion dephosphorization spray gun, characterized in that, The gun includes a gun shell (1), a refractory material layer (2), a central injection channel (3), an auxiliary cooling channel (4), and a nozzle (5). The gun shell (1) is a cylindrical hollow structure. The refractory material layer (2) is tightly attached to the inner wall of the gun shell (1). The refractory material layer (2) is divided into an outer transition layer (21), a middle anti-corrosion layer (22), and an inner wear-resistant layer (23) from the outside to the inside. The layers are tightly connected by an interface binder. The central injection channel (3) is arranged through the center of the spray gun. The auxiliary cooling channel (4) is evenly distributed around the central injection channel (3). The number of auxiliary cooling channels (4) is 4-6. The nozzle (5) is fixed at the lower end of the spray gun. The nozzle (5) is connected to the central injection channel (3) and the auxiliary cooling channel (4) respectively.

2. The long-life erosion resistant dephosphorizing lance of claim 1, wherein, The gun body shell (1) is made of Q345R low alloy high strength steel, and the thickness of the gun body shell (1) is 8-12mm.

3. The long-life erosion resistant dephosphorizing lance of claim 1 wherein, The total thickness of the refractory material layer (2) is 30-50 mm, of which the outer transition layer (21) is 15-20 mm thick, the middle anti-corrosion layer (22) is 15-20 mm thick, and the inner wear-resistant layer (23) is 10 mm thick.

4. The long-life erosion resistant dephosphorizing lance of claim 1 wherein, The nozzle (5) has a double-layer nested structure, including an inner nozzle (51) and an outer nozzle (52); the inner nozzle (51) is connected to the central injection channel (3), and the outlet end of the inner nozzle (51) is a contraction-expansion type Laval nozzle structure; the outer nozzle (52) is sleeved on the outside of the inner nozzle (51), and the outer nozzle (52) is connected to the auxiliary cooling channel (4), and the outlet end of the outer nozzle (52) is provided with an annular injection hole (53).

5. The long-life anti-erosion dephosphorization spray gun according to claim 4, characterized in that, The throat diameter of the inner nozzle (51) is 8-12 mm, and the expansion angle of the outlet end of the inner nozzle (51) is 15-20°.

6. The long-life erosion resistant dephosphorizing lance of claim 4 wherein, The angle between the annular injection hole (53) at the outlet end of the outer nozzle (52) and the outlet axis of the inner nozzle (51) is 30-45°.

7. The long-life erosion resistant dephosphorizing lance of claim 1 wherein, The inlet end of the auxiliary cooling channel (4) is connected to a cooling medium supply device, and the outlet end of the auxiliary cooling channel (4) is connected to the annular spray hole (53) of the external nozzle (52).

8. The long-life erosion resistant dephosphorizing lance of claim 1 wherein, The nozzle (5) is made of dense corundum-silicon nitride composite ceramic, and the bulk density of the composite ceramic is ≥3.6g / cm³, the compressive strength at room temperature is ≥300MPa, and the flexural strength at 1400℃ is ≥50MPa.

9. The long-life erosion resistant dephosphorizing lance of claim 1 wherein, The diameter of the central injection channel (3) is 20-25 mm, and the diameter of the auxiliary cooling channel (4) is 8-10 mm.

10. The long-life erosion resistant dephosphorizing lance of claim 1 wherein, The length of the gun body shell (1) is 4000-4500mm, and the diameter of the gun body shell (1) is 150-180mm.

Images