Wear-resistant and deformation-resistant pulverized coal spray gun

Abstract

The utility model belongs to the technical field of pulverized coal injection devices, and particularly relates to a wear-resisting and deformation-resisting pulverized coal spray gun which is provided with a high-temperature end gun barrel assembly, a low-temperature end steel pipe and a pulverized coal inlet wear-resisting steel pipe. The other end of the low-temperature end steel pipe is connected with one end of a pulverized coal inlet abrasion-resistant steel pipe, a cold-end protection steel pipe is welded to the outer portion of the connecting position of the low-temperature end steel pipe and the pulverized coal inlet abrasion-resistant steel pipe, and the high-temperature end gun barrel assembly is formed by connecting an inner composite ceramic steel pipe, a middle-layer anti-deformation steel pipe and an outer-layer anti-deformation steel pipe in a sleeved mode from inside to outside. A high-temperature end protection steel pipe is arranged outside the high-temperature end gun barrel assembly and the low-temperature end steel pipe, and two shock-stopping balls are welded outside the high-temperature end protection steel pipe; the utility model has the beneficial effects of strong anti-deformation capability, wear resistance, long service life, high production efficiency, convenience in installation and the like.

Description

Technical Field

[0001] This utility model belongs to the technical field of pulverized coal injection devices, and in particular relates to a wear-resistant and deformation-resistant pulverized coal injection gun. Background Technology

[0002] In modern blast furnace smelting processes, the blast furnace pulverized coal injection lance is a key piece of equipment, bearing the important responsibility of injecting pulverized coal into the blast furnace body. Its performance has a profound impact on the stability, economy, and environmental protection of blast furnace production.

[0003] During normal blast furnace production, the direct-blown nozzle injects oxygen-enriched hot air into the furnace, typically maintaining a temperature of 1100-1200℃. Simultaneously, a two-phase flow of coal powder and its conveying gas exists inside the nozzle, continuously eroding the inner wall of the nozzle. While the straight-tube structure of ordinary nozzles facilitates insertion and removal, the coal powder flow tends to deviate from the center of the tuyeres, scouring the tuyeres and accelerating wear. Bent-tube nozzles, although avoiding direct scouring of the tuyeres by the coal flow, are susceptible to wear and even puncture at the bends due to coal powder, shortening the nozzle's lifespan and affecting the tuyeres' lifespan. This increases equipment maintenance costs and the frequency of blast furnace shutdowns, severely hindering efficient blast furnace production.

[0004] The working environment of the pulverized coal injection lance in a blast furnace is extremely harsh. In the area approximately 1.2 meters in front of the lance, the external temperature often exceeds 1200℃. Although there is cooling from the pulverized coal gas-solid two-phase flow inside the lance, this part of the nozzle remains very hot, causing a reduction in nozzle strength. Under the influence of gravity, it can deform severely within just a few days. The deformed lance then changes the direction of the pulverized coal gas-solid two-phase flow, further exacerbating wear on the tuyeres sleeve, creating a vicious cycle.

[0005] Currently, the service life of blast furnace pulverized coal injection lances on the market is generally short. Under the combined effects of various adverse factors such as high temperature, high flow rate pulverized coal scouring, and complex airflow environment, the life of the injection lance is only about 3 months under normal circumstances. For some injection lances made of ordinary materials, in the high-temperature, high-oxygen environment of modern blast furnaces, their lifespan is even less than 10 days, requiring frequent replacement. This not only increases the labor intensity of workers and raises production costs, but also requires the blast furnace to shut down briefly during frequent injection lance replacements, affecting the continuous and stable production of the blast furnace and reducing production efficiency.

[0006] In summary, existing blast furnace pulverized coal injection lances have significant shortcomings in terms of wear resistance, deformation resistance, and service life, failing to meet the growing demands for efficient, stable, and low-cost production in blast furnace smelting. Therefore, developing a new type of blast furnace pulverized coal injection lance with superior wear resistance, strong deformation resistance, and long service life is of urgent practical significance.

[0007] In the prior art, CN207062310U discloses a blast furnace pulverized fuel injector, characterized in that the blast furnace pulverized fuel injector is a single-tube injector without an external cooling duct, comprising an inlet section, an expansion section, and an outlet section connected in sequence. The inlet section includes a pulverized coal inlet pipe, the expansion section includes a wear-resistant steel pipe connected to the pulverized coal inlet pipe and a nozzle connected to the wear-resistant steel pipe, the outlet section includes a short inlet pipe connected to the nozzle and an angled composite ceramic short pipe connected to the short inlet pipe, a first connecting sleeve is fitted at the connection between the wear-resistant steel pipe and the nozzle, a second connecting sleeve is fitted at the connection between the wear-resistant steel pipe and the pulverized coal inlet pipe, and the head end is locked to the pulverized coal inlet pipe by a locking nut, a fiber sleeve is fitted on the nozzle, the fiber sleeve is limited by a retaining ring, and a protective sleeve is fitted at the connection between the short inlet pipe and the composite ceramic short pipe.

[0008] The existing technology has the following drawbacks: 1. Poor resistance to deformation; 2. Poor vibration damping and heat insulation effect after installation in the gun insertion channel. Utility Model Content

[0009] To address the aforementioned problems, the purpose of this utility model is to disclose a wear-resistant and deformation-resistant pulverized coal spray gun, which is achieved through the following technical solution.

[0010] A wear-resistant and deformation-resistant pulverized coal spray gun comprises a high-temperature end gun barrel assembly, a low-temperature end steel pipe, and a pulverized coal inlet wear-resistant steel pipe. One end of the low-temperature end steel pipe is connected to the other end of the high-temperature end gun barrel assembly, and the other end of the low-temperature end steel pipe is connected to one end of the pulverized coal inlet wear-resistant steel pipe. A cold-end protective steel pipe is welded to the outside of the connection between the low-temperature end steel pipe and the pulverized coal inlet wear-resistant steel pipe. The cold-end protective steel pipe is used to protect the connection between the low-temperature end steel pipe and the pulverized coal inlet wear-resistant steel pipe. One end of the cold-end protective steel pipe is welded to the low-temperature end steel pipe, and the other end is welded to the pulverized coal inlet wear-resistant steel pipe.

[0011] The high-temperature end barrel assembly is composed of an inner composite ceramic steel tube, a middle layer of anti-deformation steel tube, and an outer layer of anti-deformation steel tube, which are connected from the inside out.

[0012] A high-temperature end protective steel pipe is provided on the outside of the connection between the high-temperature end gun barrel assembly and the low-temperature end steel pipe. One end of the high-temperature end protective steel pipe is welded to the high-temperature end gun barrel assembly, and the other end of the high-temperature end protective steel pipe is welded to the low-temperature end steel pipe to protect the connection between the two. Two vibration damping balls are welded to the outside of the high-temperature end protective steel pipe.

[0013] The aforementioned wear-resistant and deformation-resistant pulverized coal spray gun has an inner composite ceramic steel pipe sintered by a self-propagating aluminothermic cladding method. The outer surface of the inner composite ceramic steel pipe is made of 310S heat-resistant stainless steel or heat-resistant stainless steel with performance not lower than this grade, and the inner surface is a ceramic layer. One end of the inner composite ceramic steel pipe has a certain angle.

[0014] The aforementioned wear-resistant and deformation-resistant pulverized coal spray gun has a middle layer of deformation-resistant steel pipe made of 310S heat-resistant stainless steel or heat-resistant stainless steel with performance not lower than this grade. One end of the middle layer of deformation-resistant steel pipe is not welded to the inner composite ceramic steel pipe, while the other end of the middle layer of deformation-resistant steel pipe is welded to the inner composite ceramic steel pipe, leaving room for linear expansion. One end of the middle layer of deformation-resistant steel pipe is processed into a tapered shape to ensure stable external hot airflow.

[0015] The aforementioned wear-resistant and deformation-resistant pulverized coal spray gun uses an outer layer of 310S heat-resistant stainless steel or heat-resistant stainless steel with performance no lower than this grade as its outer layer of 310S heat-resistant stainless steel. One end of the outer layer of 310S heat-resistant stainless steel is not welded to the middle layer of 310S heat-resistant stainless steel, while the other end of the outer layer of 310S heat-resistant stainless steel is welded to the middle layer of 310S heat-resistant stainless steel, leaving room for linear expansion. One end of the outer layer of 310S heat-resistant stainless steel is processed into a tapered shape and is slightly shorter than the middle layer of 310S heat-resistant stainless steel. The combination of one end of the outer layer of 310S heat-resistant stainless steel and one end of the middle layer of 310S heat-resistant stainless steel forms a streamlined shape to ensure stable external hot airflow.

[0016] The aforementioned wear-resistant and deformation-resistant pulverized coal spray gun has a wear-resistant retaining ring welded to one end of the inner composite ceramic steel pipe. The wear-resistant retaining ring is made of 2848W5 high-nickel-chromium alloy or a high-nickel-chromium alloy with performance not lower than this grade, which plays a role in stabilizing the coal flow and preventing the inner composite ceramic steel pipe from cracking due to high temperature.

[0017] The wear-resistant and deformation-resistant pulverized coal spray gun described above has a high-temperature end protective steel pipe made of 304 heat-resistant stainless steel or heat-resistant stainless steel with performance not lower than this grade.

[0018] The wear-resistant and deformation-resistant pulverized coal spray gun described above uses a composite ceramic pipe sintered by a self-propagating aluminothermic cladding method for the pulverized coal inlet wear-resistant steel pipe. The outer part of the pulverized coal inlet wear-resistant steel pipe is a 304 stainless steel pipe or a stainless steel pipe with performance not lower than 304, and the inner part is a ceramic layer. The pulverized coal inlet wear-resistant steel pipe plays a rectifying role for the inlet coal flow, so that the coal flow is not deflected and the low-temperature end steel pipe is not damaged.

[0019] The aforementioned wear-resistant and deformation-resistant pulverized coal spray gun uses a 304 stainless steel pipe or a stainless steel pipe with properties no lower than 304 as the pulverized coal inlet channel. Alternatively, a composite ceramic pipe sintered using a self-propagating aluminothermic cladding method can be used. When using a composite ceramic pipe sintered using a self-propagating aluminothermic cladding method, the wear-resistant steel pipe at the pulverized coal inlet can be eliminated.

[0020] The aforementioned wear-resistant and deformation-resistant pulverized coal spray gun has an adjustment steel plate outside the cold end protection steel pipe.

[0021] The aforementioned wear-resistant and deformation-resistant pulverized coal spray gun has a gun clip fitted onto the outer steel pipe at the low-temperature end.

[0022] The adjusting steel plate assists in the installation and adjustment of the angle of this application and in the tapping of this application; and the adjusting steel plate and the high-temperature end barrel assembly are tilted to the same side, serving as an indicator.

[0023] The gun clamp is used to install this application. Its dimensions, structure, and form are various and are adjusted according to the on-site ball valve. The position of the gun clamp can be adjusted along the axial direction of the low-temperature end steel pipe or rotated around the axial direction of the low-temperature end steel pipe.

[0024] This application has the following beneficial effects:

[0025] 1. It has the advantages of strong resistance to deformation, wear resistance, long service life and high production efficiency.

[0026] 2. Vibration damping balls are installed, which serve two purposes during installation: firstly, to provide support and prevent shaking under the influence of hot air, thus affecting the coal flow; secondly, to provide insulation and reduce the radiative heat transfer of hot air to the rear of this application.

[0027] 3. A gun clip and gun adjustment plate are included for easier installation.

[0028] 4. The high-temperature end barrel assembly uses an internal composite ceramic steel tube, which has strong high-temperature resistance and wear resistance.

[0029] 5. The high-temperature end barrel assembly is equipped with at least two layers of anti-deformation steel pipes, which has stronger anti-deformation performance.

[0030] 6. The wear-resistant steel pipe at the pulverized coal inlet is a composite ceramic pipe sintered by the self-propagating aluminothermic-cladding method, which plays a role in rectifying the inlet coal flow, preventing the coal flow from deviating, and preventing damage to the steel pipe at the low temperature end. Attached Figure Description

[0031] Figure 1 This is a cross-sectional view of an embodiment of the present utility model.

[0032] Figure 2 This is an enlarged view of region A in an embodiment of this utility model.

[0033] Figure 3 This is an enlarged view of region B in an embodiment of this utility model.

[0034] Figure 4 This is a cross-sectional view of the high-temperature end barrel assembly according to an embodiment of the present invention.

[0035] Figure 5 This is a right view of an embodiment of the present utility model.

[0036] Figure 6 This is a schematic diagram of the structure of this utility model installed on the blast furnace tuyeres according to an embodiment.

[0037] In the figure, the attached figures are labeled as follows: 1. High-temperature end barrel assembly, 2. Low-temperature end steel pipe, 3. Gun clip, 4. Cold end protective steel pipe, 5. Gun adjustment steel plate, 6. Coal powder inlet wear-resistant steel pipe, 7. Vibration damping ball, 8. High-temperature end protective steel pipe, 9. Inner composite ceramic steel pipe, 10. Middle layer anti-deformation steel pipe, 11. Outer layer anti-deformation steel pipe, 12. Wear-resistant retaining ring, 13. Gun insertion channel. Detailed Implementation

[0038] Example: Figures 1 to 5 A wear-resistant and deformation-resistant pulverized coal spray gun comprises a high-temperature end gun barrel assembly 1, a low-temperature end steel pipe 2, and a pulverized coal inlet wear-resistant steel pipe 6. One end of the low-temperature end steel pipe 2 is connected to the other end of the high-temperature end gun barrel assembly 1, and the other end of the low-temperature end steel pipe 2 is connected to one end of the pulverized coal inlet wear-resistant steel pipe 6. A cold end protection steel pipe 4 is welded to the outside of the connection between the low-temperature end steel pipe 2 and the pulverized coal inlet wear-resistant steel pipe 6. The cold end protection steel pipe 4 is used to protect the connection between the low-temperature end steel pipe 2 and the pulverized coal inlet wear-resistant steel pipe 6. One end of the cold end protection steel pipe 4 is welded to the low-temperature end steel pipe 2, and the other end is welded to the pulverized coal inlet wear-resistant steel pipe 6. A gun adjustment steel plate 5 is provided on the outside of the cold end protection steel pipe 4, and a gun clip 3 is fitted on the outside of the low-temperature end steel pipe 2.

[0039] The connection methods between the high-temperature end gun barrel assembly 1 and the low-temperature end steel pipe 2 include, but are not limited to, welding, threaded connection, and riveting;

[0040] A high-temperature end protective steel pipe 8 is provided on the outside of the connection between the high-temperature end gun barrel assembly 1 and the low-temperature end steel pipe 2. One end of the high-temperature end protective steel pipe 8 is welded to the high-temperature end gun barrel assembly 1, and the other end of the high-temperature end protective steel pipe 8 is welded to the low-temperature end steel pipe 2 to protect the connection between the two. The material is 304 heat-resistant stainless steel or heat-resistant stainless steel with performance not lower than this grade. Two vibration damping balls 7 are welded on the outside of the high-temperature end protective steel pipe 8.

[0041] The high-temperature end barrel assembly 1 is composed of an inner composite ceramic steel tube 9, a middle layer anti-deformation steel tube 10, an outer layer anti-deformation steel tube 11, and a wear-resistant retaining ring 12;

[0042] The inner composite ceramic steel pipe 9 is a composite ceramic pipe sintered by self-propagating aluminothermic cladding method. The outer surface of the inner composite ceramic steel pipe 9 is 310S heat-resistant stainless steel pipe or heat-resistant stainless steel pipe with performance not lower than this grade, and the inner surface is a ceramic layer; one end of the inner composite ceramic steel pipe 9 has a certain angle.

[0043] The material of the middle layer anti-deformation steel pipe 10 is 310S heat-resistant stainless steel or heat-resistant stainless steel with performance not lower than this grade. The middle layer anti-deformation steel pipe 10 is fitted outside the inner composite ceramic steel pipe 9. One end of the middle layer anti-deformation steel pipe 10 is not welded to the inner composite ceramic steel pipe 9, and the other end of the middle layer anti-deformation steel pipe 10 is welded to the inner composite ceramic steel pipe 9, leaving room for linear expansion. One end of the middle layer anti-deformation steel pipe 10 is processed into a tapered shape to ensure stable external hot airflow.

[0044] The outer anti-deformation steel pipe 11 is made of 310S heat-resistant stainless steel or heat-resistant stainless steel with performance not lower than this grade. The outer anti-deformation steel pipe 11 is fitted outside the middle anti-deformation steel pipe 10. One end of the outer anti-deformation steel pipe 11 is not welded to the middle anti-deformation steel pipe 10, while the other end of the outer anti-deformation steel pipe 11 is welded to the middle anti-deformation steel pipe 10, leaving room for linear expansion. One end of the outer anti-deformation steel pipe 11 is processed into a tapered shape. The outer anti-deformation steel pipe 11 is slightly shorter than the middle anti-deformation steel pipe 10. The combination of one end of the outer anti-deformation steel pipe 11 and one end of the middle anti-deformation steel pipe 10 forms a streamlined shape to ensure stable external hot airflow.

[0045] The wear-resistant retaining ring 12 is made of 2848W5 high-nickel-chromium alloy or a high-nickel-chromium alloy with performance not lower than this grade; the wear-resistant retaining ring 12 is welded to one end of the inner composite ceramic steel pipe 9 to stabilize the coal flow and prevent the one end of the inner composite ceramic steel pipe 9 from cracking due to high temperature.

[0046] The wear-resistant steel pipe 6 at the coal powder inlet is a composite ceramic short pipe sintered by the self-propagating aluminothermic cladding method. The outer part of the wear-resistant steel pipe 6 at the coal powder inlet is a 304 stainless steel pipe or a stainless steel pipe with performance not lower than 304, and the inner part is a ceramic layer. The wear-resistant steel pipe 6 at the coal powder inlet plays a rectifying role in the inlet coal flow, so that the coal flow is not deflected and the low-temperature end steel pipe 2 is prevented from being worn.

[0047] The low-temperature end steel pipe 2 is made of 304 stainless steel or stainless steel with performance not lower than 304, serving as the pulverized coal inlet channel. Alternatively, it can be a composite ceramic pipe sintered using the self-propagating aluminothermic cladding method. When a composite ceramic pipe sintered using the self-propagating aluminothermic cladding method is used, the pulverized coal inlet wear-resistant steel pipe 6 can be omitted.

[0048] The adjusting steel plate 5 assists in the installation and adjustment of the angle of this application and in the tapping of this application; and the adjusting steel plate 5 and the high-temperature end barrel assembly 1 are tilted to the same side, serving as an indicator.

[0049] Gun clip 3 is used to install this application. Its dimensions, structure and form are various and are adjusted according to the ball valve on site. The position of gun clip 3 can be adjusted along the axial direction of the low-temperature end steel pipe 2, or it can be rotated around the axial direction of the low-temperature end steel pipe 2.

[0050] like Figure 6When this application is installed at the blast furnace tuyeres, it is inserted into the lance channel 13, and the outer diameter of the vibration damping ball 7 is slightly smaller than that of the lance channel 13. After the lance is installed, the vibration damping ball 7 remains inside the lance channel 13. The vibration damping ball 7 serves as a support to prevent the application from shaking under the action of hot air and affecting the coal flow. On the other hand, the vibration damping ball 7 serves as an insulator to reduce the radiative heat transfer of hot air to the rear of the application.

[0051] In the wear-resistant and deformation-resistant pulverized coal spray gun described above, all ends are located on the same side, and all other ends are located on opposite sides, such that when one end is on the left, the other end is on the right.

[0052] In the wear-resistant and deformation-resistant pulverized coal spray gun described above, the middle layer deformation-resistant steel pipe 10 and the outer layer deformation-resistant steel pipe 11 can be a whole pipe or segmented pipes.

[0053] This application has the following beneficial effects:

[0054] 1. It has the advantages of strong resistance to deformation, wear resistance, long service life and high production efficiency.

[0055] 2. Vibration damping balls 7 are installed. During installation, they serve two purposes: firstly, to provide support and prevent shaking under the action of hot air, which would affect the coal flow; secondly, to provide insulation and reduce the radiative heat transfer of hot air to the rear of this application.

[0056] 3. Gun clip 3 and gun adjustment steel plate 5 are provided for easier installation.

[0057] 4. In the high-temperature end barrel assembly 1, an internal composite ceramic steel tube 9 is used, which has strong high temperature resistance and wear resistance.

[0058] 5. The high-temperature end barrel assembly 1 is provided with at least one layer of anti-deformation steel pipe 10, which has stronger anti-deformation performance.

[0059] 6. The wear-resistant steel pipe 6 at the coal powder inlet is a composite ceramic pipe sintered by the self-propagating aluminothermic-cladding method, which plays a role in rectifying the inlet coal flow, preventing the coal flow from deviating, and preventing wear on the low-temperature end steel pipe 2.

[0060] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A wear-resistant and deformation-resistant pulverized coal spray gun, comprising a wear-resistant steel pipe (6) for pulverized coal inlet, characterized in that: It also has a high-temperature end gun barrel assembly (1) and a low-temperature end steel pipe (2). One end of the low-temperature end steel pipe (2) is connected to the other end of the high-temperature end gun barrel assembly (1), and the other end of the low-temperature end steel pipe (2) is connected to one end of the pulverized coal inlet wear-resistant steel pipe (6). A cold end protection steel pipe (4) is welded to the outside of the connection between the low-temperature end steel pipe (2) and the pulverized coal inlet wear-resistant steel pipe (6). One end of the cold end protection steel pipe (4) is welded to the low-temperature end steel pipe (2), and the other end is welded to the pulverized coal inlet wear-resistant steel pipe (6). The high-temperature end gun barrel assembly (1) is composed of an inner composite ceramic steel pipe (9), a middle layer anti-deformation steel pipe (10), and an outer layer anti-deformation steel pipe (11) connected from the inside to the outside; A high-temperature end protective steel pipe (8) is provided on the outside of the connection between the high-temperature end gun barrel assembly (1) and the low-temperature end steel pipe (2). One end of the high-temperature end protective steel pipe (8) is welded to the high-temperature end gun barrel assembly (1), and the other end of the high-temperature end protective steel pipe (8) is welded to the low-temperature end steel pipe (2). Two shock-absorbing balls (7) are welded to the outside of the high-temperature end protective steel pipe (8).

2. The wear-resistant and deformation-resistant pulverized coal spray gun according to claim 1, characterized in that: The inner composite ceramic steel pipe (9) is a composite ceramic pipe sintered by self-propagating aluminothermic cladding method. The outer part of the inner composite ceramic steel pipe (9) is 310S heat-resistant stainless steel pipe or heat-resistant stainless steel pipe with performance not lower than this grade, and the inner part is a ceramic layer; one end of the inner composite ceramic steel pipe (9) has a certain angle.

3. The wear-resistant and deformation-resistant pulverized coal spray gun according to claim 2, characterized in that: The material of the middle layer anti-deformation steel pipe (10) is 310S heat-resistant stainless steel or heat-resistant stainless steel with performance not lower than this grade. One end of the middle layer anti-deformation steel pipe (10) is not welded to the inner composite ceramic steel pipe (9), and the other end of the middle layer anti-deformation steel pipe (10) is welded to the inner composite ceramic steel pipe (9). One end of the middle layer anti-deformation steel pipe (10) is processed into a tapered shape.

4. The wear-resistant and deformation-resistant pulverized coal spray gun according to claim 3, characterized in that: The outer anti-deformation steel pipe (11) is made of 310S heat-resistant stainless steel or heat-resistant stainless steel with performance not lower than this grade. One end of the outer anti-deformation steel pipe (11) is not welded to the middle anti-deformation steel pipe (10), and the other end of the outer anti-deformation steel pipe (11) is welded to the middle anti-deformation steel pipe (10). One end of the outer anti-deformation steel pipe (11) is processed into a tapered shape. The outer anti-deformation steel pipe (11) is shorter than the middle anti-deformation steel pipe (10). One end of the outer anti-deformation steel pipe (11) and one end of the middle anti-deformation steel pipe (10) are combined in a streamlined shape.

5. The wear-resistant and deformation-resistant pulverized coal spray gun according to claim 4, characterized in that: One end of the inner composite ceramic steel pipe (9) is welded with a wear-resistant retaining ring (12). The material of the wear-resistant retaining ring (12) is 2848W5 high nickel-chromium alloy or a high nickel-chromium alloy with performance not lower than this grade.

6. The wear-resistant and deformation-resistant pulverized coal spray gun according to claim 5, characterized in that: The material of the high-temperature end protection steel pipe (8) is 304 heat-resistant stainless steel or heat-resistant stainless steel with performance not lower than this grade.

7. The wear-resistant and deformation-resistant pulverized coal spray gun according to claim 6, characterized in that: The wear-resistant steel pipe (6) for pulverized coal inlet is a composite ceramic pipe sintered by self-propagating aluminothermic cladding method. The outer part of the wear-resistant steel pipe (6) for pulverized coal inlet is 304 stainless steel pipe or stainless steel pipe with performance not lower than 304, and the inner part is a ceramic layer.

8. The wear-resistant and deformation-resistant pulverized coal spray gun according to claim 7, characterized in that: The low-temperature end steel pipe (2) is a 304 stainless steel pipe or a stainless steel pipe with performance not lower than 304, or a composite ceramic pipe sintered with a self-propagating aluminothermic cladding method.

9. The wear-resistant and deformation-resistant pulverized coal spray gun according to claim 8, characterized in that: The cold end protection steel pipe (4) is provided with a gun adjustment steel plate (5).

10. A wear-resistant and deformation-resistant pulverized coal spray gun according to claim 9, characterized in that: The low-temperature end steel pipe (2) is fitted with a gun clip (3).

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