A heat treatment furnace and method for processing super austenitic corrosion resistant stainless steel pipe

Abstract

The application discloses a kind of processing super-austenitic corrosion-resistant stainless steel pipe heat treatment furnace and method, it is related to heat treatment furnace technical field, including furnace box, the inside of furnace box is equipped with the fuel mixing assembly of initial mixed fuel, one side of the fuel mixing assembly is equipped with air supply machine, the flue pipe of one side of the fuel mixing assembly and air supply machine is jointly installed with.This application mixes the design of leaf and makes the smoke that is spouted from the interface of pipe mouth form vortex flow state, this flowing mode breaks the interface between smoke and fuel, increases the contact area of both, promotes more sufficient mixing, and the combination of beam mouth pipe and horn pipe into venturi tube shape, utilizes the principle of fluid dynamics to accelerate gas flow and improve pressure difference, enhances the efficiency of smoke being inhaled, also promotes the rapid, uniform mixing of fuel and smoke under high pressure to avoid local enrichment to cause backfire diffusion, reduces the possibility of fuel concentration being too high in local area, to reduce the risk of backfire.

Description

Technical Field

[0001] This invention relates to the field of heat treatment furnace technology, and in particular to a heat treatment furnace and method for processing super austenitic corrosion-resistant stainless steel tubes. Background Technology

[0002] For example, CN104894359B, an invention entitled "A Constant Pressure Heat Treatment Furnace for Metal Plates and Strips," includes a furnace body, a natural gas main pipeline, a combustion air main pipeline, and several burners arranged along the length of the furnace body. Each burner in the furnace body is directly connected to the natural gas main pipeline via its own independent natural gas branch pipeline, and each burner is also directly connected to the combustion air main pipeline via its own independent combustion air branch pipeline. Furthermore, the natural gas main pipeline and the combustion air main pipeline are designed with increased diameter, forming energy storage tanks inside each main pipeline. This constant pressure heat treatment furnace has a simple and reasonable pipeline layout, low cost, and introduces the concept of "energy storage tanks," achieving precise and stable control of the air intake to each burner, reaching the optimal combustion state of each burner, thereby significantly improving energy utilization.

[0003] In the burner combustion system of the heat treatment furnace, it is difficult for the fuel and flue gas to achieve an ideal mixing state, which easily leads to excessively high or low fuel concentration in local areas. Moreover, uneven mixing of fuel and flue gas during the heat treatment process results in low combustion efficiency, risk of backfire due to local enrichment, and unstable flame morphology. Therefore, this application provides a heat treatment furnace and method for processing super austenitic corrosion-resistant stainless steel tubes to meet the requirements. Summary of the Invention

[0004] The purpose of this application is to provide a heat treatment furnace and method for processing super austenitic corrosion-resistant stainless steel tubes, which can effectively solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this application provides the following technical solution: a heat treatment furnace for processing super austenitic corrosion-resistant stainless steel tubes, comprising a furnace box, wherein a fuel mixing assembly for primary fuel mixing is installed inside the furnace box, a blower is provided on one side of the fuel mixing assembly, a flue pipe is installed on one side of both the fuel mixing assembly and the blower, a fuel pipe is provided on one side of the fuel mixing assembly, and a reflux pipe is provided on one side of the fuel mixing assembly to uniformly mix fuel and flue gas and prevent backfire diffusion caused by local enrichment, wherein a flame control assembly for secondary fuel mixing and optimizing flame length and concentration distribution is provided at one end of the reflux pipe, and a flow guiding mechanism for adjusting the fuel injection angle and optimizing flame length is provided inside the flame control assembly;

[0006] The return pipe includes a constricted tube and a flared tube. One end of the constricted tube is equipped with an inner guide tube. The constricted tube, the inner guide tube, and the flared tube are combined in the shape of a Venturi tube for autonomously drawing in flue gas and mixing it thoroughly with fuel.

[0007] The return pipe fitting also includes a conical shell, the outer surface of which is provided with a radiating block. One end of the horn tube is provided with a guide ring tube, which is fixed to the inner wall of the conical shell. A swirl vane is provided between the guide ring tube and the inner guide tube to guide the flue gas vortex.

[0008] The fuel mixing assembly includes a connecting pipe, which is installed on the inner wall of the furnace box and one end of the connecting pipe is connected to the blower. The conical shell and the conical tube are both installed at one end of the connecting pipe, and one end of the flue pipe extends through the connecting pipe into the cavity between the conical shell and the conical tube.

[0009] The connecting pipe has a central conduit connected to one end of the fuel pipe at its center. The outer surface of the central conduit has several fuel conduits arranged in a ring array. The inner walls of the several fuel conduits are provided with a ring nozzle, and one side of the ring nozzle has several nozzles arranged in a ring array.

[0010] The inner wall of the connecting pipe is provided with mixing blades, and the bundle pipe is sleeved on the outside of the annular spray pipe.

[0011] The flame control assembly includes an installation tube, with the conical shell and the nozzle tube mounted together at one end of the installation tube. A fuel ring is provided on the outer surface of the installation tube, and a plurality of secondary nozzles arranged in a ring array and communicating with the interior of the fuel ring are provided inside the installation tube. The fuel ring is located inside the conical shell. An outer tube is provided at one end of the installation tube, and an inner tube is provided on the inner wall of the outer tube. A plurality of exhaust holes arranged in a ring array are provided on the inner wall of the inner tube.

[0012] The flow guiding mechanism includes a flame guiding assembly, which includes a frame disk. The frame disk is installed on the inner wall of the inner tube. A plurality of guide tubes of different diameters are provided on one side of the frame disk and are nested together. The interior of the frame disk is provided with a plurality of first oblique blades arranged in a ring array, and the first oblique blades are provided on the outer surface of the guide tubes. The interior of the frame disk is provided with a plurality of through holes.

[0013] One end of the secondary nozzle is located inside the through hole, and the inner wall of the guide pipe with the largest diameter is provided with a support frame, and the inside of the support frame is provided with a flame-gathering guide cone.

[0014] The flow guiding mechanism includes an air guiding component, which includes a mounting plate. The mounting plate is installed on the inner wall of the inner tube. The inner wall of the mounting plate has several circular holes arranged in a ring array, and one end of the secondary nozzle extends into the interior of the circular holes. Several mixing blades arranged in a ring array are provided on one side of the mounting plate.

[0015] This invention also provides a method for processing super austenitic corrosion-resistant stainless steel tubes using a heat treatment furnace. The specific operation method of the heat treatment furnace is as follows:

[0016] S1, super austenitic corrosion-resistant stainless steel pipe contains high levels of nickel, molybdenum and chromium alloying elements. The heat treatment furnace used to make the steel pipe requires precise temperature control. The required heat treatment furnace is composed of multiple furnace boxes spliced ​​together, and the temperature inside each furnace box is different.

[0017] S2. When heating the inside of the furnace box, the blower draws the flue gas from the flue pipe and sends it into the inside of the return pipe through the fuel mixing assembly. Some of the flue gas inside the flue pipe will be directly discharged into the inside of the return pipe. After the flue gas is discharged through the flue pipe, the fuel pipe pushes fuel into the inside of the fuel mixing assembly. The fuel sprayed by the fuel mixing assembly will be fully mixed with the flue gas inside the return pipe.

[0018] S3. The fuel flue gas mixed inside the return pipe will be discharged through the flame control component, which will then spray fuel again and adjust the fuel injection angle through the flow guide mechanism to optimize the flame length.

[0019] In summary, the technical effects and advantages of this invention are as follows:

[0020] 1. The design of the mixing blade in this invention causes the flue gas ejected from the connecting pipe to form a vortex flow. This flow pattern breaks the interface between the flue gas and the fuel, increases the contact area between the two, and promotes more thorough mixing. The combination of the constricted tube and the trumpet tube forms a Venturi tube shape, which uses the principle of fluid dynamics to accelerate gas flow and increase the pressure difference, thereby enhancing the efficiency of flue gas being drawn in. It also promotes rapid and uniform mixing of fuel and flue gas under high pressure, avoiding local enrichment that could lead to backfire diffusion, reducing the possibility of excessively high fuel concentration in local areas, and thus reducing the risk of backfire.

[0021] 2. In this invention, the fuel first enters the fuel ring through the fuel conduit, and then is sprayed out through the secondary nozzle and mixed again with the fuel inside the return pipe. This can adjust the distribution concentration of fuel in the flue gas, ensuring that the fuel is evenly distributed throughout the combustion area and avoiding problems such as excessively high or low local concentrations. Through multiple mixing, the mixing uniformity of fuel and flue gas can be improved. Furthermore, by adjusting the amount and angle of fuel injection from the secondary nozzle, the flame length can be effectively controlled, preventing problems such as excessively long flames causing damage to the inner wall of the furnace or excessively short flames causing uneven heating.

[0022] 3. The design of the first oblique blade in this invention helps to change the direction of the gas mixture flow inside the return pipe, so that the gas mixture meets the fuel ejected from the secondary nozzle at a specific angle. This increases the contact area between the fuel and the gas mixture, promoting more thorough mixing. The through hole and guide pipe work together with the first oblique blade to ensure that the fuel and gas mixture can be mixed quickly and efficiently in a short time. The distributed guide pipes not only provide physical constraints but also enhance the degree of turbulence during the mixing process, further improving the mixing efficiency. Furthermore, the spindle-shaped cross-section design of the flame-gathering guide cone allows the gas to flow along its surface and eventually be ejected, which can effectively converge the ejected gas into a more concentrated and stable flame shape, avoiding the problems of flame dispersion or irregularity.

[0023] 4. The design of the mixing blades surrounding the circular orifice in this invention effectively guides the gas mixture inside the return pipe to meet and fully mix with the fuel ejected from the orifice. This increases the contact area between the fuel and gas mixture, ensuring that they reach a good mixing state in a short time. The mixing blades guide the gas mixture to be ejected in a vortex form, thereby creating a strong turbulence effect, making the fuel and gas mix more uniformly and thoroughly. Turbulent mixing can significantly increase the diffusion rate between two substances with large local concentration differences, thus promoting more effective mixing. Furthermore, the vortex airflow generated by the mixing blades forms a more concentrated and stable flame shape. The vortex airflow can better control the development direction and expansion range of the flame, avoiding the problems of flame dispersion or irregular combustion. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A first-view three-dimensional structural diagram of a heat treatment furnace;

[0026] Figure 2 A two-dimensional structural diagram of a heat treatment furnace from a second perspective.

[0027] Figure 3 A first-view three-dimensional connection structure diagram of the burner in a heat treatment furnace;

[0028] Figure 4 A two-dimensional view of the burner connection structure of a heat treatment furnace.

[0029] Figure 5 A first-person perspective three-dimensional connection structure diagram of the flow guiding mechanism;

[0030] Figure 6 A schematic diagram of the three-dimensional connection structure of the flow guiding mechanism from a second perspective;

[0031] Figure 7 This is a three-dimensional cross-sectional view of the burner's connection structure.

[0032] Figure 8 This is a schematic diagram of the three-dimensional connection structure of the fuel mixing assembly;

[0033] Figure 9 This is a schematic diagram of a partial three-dimensional connection structure of the fuel mixing assembly;

[0034] Figure 10 A first-view, three-dimensional cross-sectional view of the connection structure between the return pipe and the fuel mixing assembly;

[0035] Figure 11 A second-view, three-dimensional cross-sectional view of the connection structure between the return pipe fitting and the fuel mixing assembly;

[0036] Figure 12 This is a three-dimensional sectional view of the connection structure of the return pipe fitting;

[0037] Figure 13 A schematic diagram of the three-dimensional connection structure of the flame control assembly and the fuel mixing assembly;

[0038] Figure 14 A three-dimensional cross-sectional view of the connection structure of the flame control assembly;

[0039] Figure 15 A schematic diagram of the three-dimensional connection structure of the flame control assembly and the gas guiding assembly;

[0040] Figure 16 A schematic diagram of the three-dimensional connection structure of the flame control assembly and the flame guide assembly;

[0041] Figure 17 A first-view three-dimensional connection structure diagram of the flame control assembly;

[0042] Figure 18 A second-view three-dimensional connection structure diagram of the flame control assembly;

[0043] Figure 19 This is a schematic diagram of the three-dimensional connection structure of the flame guiding assembly;

[0044] Figure 20 This is a three-dimensional cross-sectional view of the connection structure of the flame guiding assembly;

[0045] Figure 21 This is a schematic diagram of the three-dimensional connection structure of the frame disk;

[0046] Figure 22 This is a schematic diagram of the three-dimensional connection structure of the flame-concentrating guide cone;

[0047] Figure 23 A schematic diagram of the three-dimensional connection structure of the flame control assembly and the secondary nozzle;

[0048] Figure 24 This is a schematic diagram of the three-dimensional connection structure of the flame control assembly.

[0049] In the diagram: 1. Furnace box; 2. Return pipe fittings; 21. Bundle tube; 22. Conical shell; 23. Radiant block; 24. Rotary blade; 25. Guide ring pipe; 26. Horn tube; 27. Inner guide tube; 3. Flame control assembly; 31. Fuel ring; 32. Outer pipe; 33. Mounting pipe; 34. Secondary nozzle; 35. Inner pipe; 36. Exhaust port; 4. Fuel mixing assembly; 41. Connecting pipe port; 42. Ring nozzle; 43. Fuel guide tube; 44. Central guide tube; 45. Mixing blade; 46. Nozzle; 5. Blower; 6. Flue pipe; 7. Fuel pipe; 8. Flame guide assembly; 81. Frame plate; 82. First oblique blade; 83. Guide tube; 84. Support frame; 85. Flame concentrating guide cone; 87. Through hole; 9. Gas guide assembly; 91. Mounting plate; 92. Round hole; 93. Mixing blade. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] Example 1, Reference Figures 1 to 24The heat treatment furnace and method for processing super austenitic corrosion-resistant stainless steel tubes shown includes a furnace box 1. A fuel mixing assembly 4 for primary fuel mixing is installed inside the furnace box 1. A blower 5 is provided on one side of the fuel mixing assembly 4. A flue pipe 6 is installed on one side of both the fuel mixing assembly 4 and the blower 5. A fuel pipe 7 is provided on one side of the fuel mixing assembly 4. A return pipe 2 is provided on one side of the fuel mixing assembly 4 to uniformly mix fuel and flue gas and prevent backfire diffusion caused by local enrichment. A flame control assembly 3 for secondary fuel mixing and optimizing flame length and concentration distribution is provided at one end of the return pipe 2. A flow guiding mechanism for adjusting the fuel injection angle and optimizing flame length is provided inside the flame control assembly 3.

[0052] It is worth noting that super austenitic corrosion-resistant stainless steel pipes contain high levels of alloying elements such as nickel, molybdenum, and chromium. The heat treatment furnace used to manufacture the steel pipes requires precise temperature control. The required heat treatment furnace is composed of multiple furnace boxes 1 spliced ​​together, and the internal temperature of each furnace box 1 is different. Moreover, the internal temperature of each furnace box 1 can be adjusted independently. In the production process of super austenitic stainless steel pipes, different heat treatment stages require different temperature settings.

[0053] When heating the inside of the furnace box 1, the blower 5 draws the flue gas from the flue pipe 6 and sends it into the inside of the return pipe 2 through the fuel mixing assembly 4. Some of the flue gas inside the flue pipe 6 will be directly discharged into the inside of the return pipe 2. After the flue gas is discharged through the flue pipe 6, the fuel pipe 7 pushes fuel into the inside of the fuel mixing assembly 4. The fuel sprayed by the fuel mixing assembly 4 and the flue gas will be fully mixed inside the return pipe 2.

[0054] In this process, flue gas and fuel are mixed through fuel mixing assembly 4, and then through return pipe 2, thereby preventing uniform mixing of fuel and flue gas and preventing backfire diffusion caused by local enrichment.

[0055] The fuel flue gas mixed inside the return pipe 2 will be discharged through the flame control assembly 3, and the flame control assembly 3 will spray fuel again to adjust the fuel injection angle and optimize the flame length through the flow guiding mechanism.

[0056] The flame length and distribution can be further optimized by re-injecting fuel through the flame control component 3 and adjusting the injection angle using the flow guiding mechanism, thereby ensuring that the heat is evenly distributed in the furnace box 1 and improving the consistency and stability of the temperature.

[0057] Example 2, Reference Figures 7 to 12 Further technical solutions for the fuel mixing assembly 4 and the return pipe 2 shown.

[0058] The fuel mixing assembly 4 includes a connecting pipe 41, which is installed on the inner wall of the furnace box 1. One end of the connecting pipe 41 is connected to the blower 5. The conical shell 22 and the conical tube 21 are both installed at one end of the connecting pipe 41. One end of the flue pipe 6 extends through the connecting pipe 41 into the cavity between the conical shell 22 and the conical tube 21.

[0059] A central conduit 44 is provided in the middle of the connecting pipe port 41 and connected to one end of the fuel pipe 7. Several fuel conduits 43 are arranged in a ring array on the outer surface of the central conduit 44. A ring nozzle 42 is provided on the inner wall of the several fuel conduits 43, and several nozzles 46 are arranged in a ring array on one side of the ring nozzle 42.

[0060] It is worth noting that the flue gas inside the flue pipe 6 is drawn in by the blower 5 and sprayed into the connecting pipe port 41, while the fuel pipe 7 injects fuel into the central duct 44. The fuel will be sprayed out through the fuel duct 43. The fuel entering the fuel duct 43 will be regulated by the internal control valve to enter the annular nozzle 42 and the flame control assembly 3. Some of the fuel inside the fuel duct 43 will be sent into the annular nozzle 42 and finally sprayed out through the nozzle 46.

[0061] The inner wall of the connecting pipe 41 is provided with a mixing blade 45, and the bundle pipe 21 is sleeved on the outside of the ring spray pipe 42.

[0062] The fuel ejected through the nozzle 46 will mix with the flue gas ejected from the connecting pipe 41, and the mixing blade 45 is used to change the direction of the flue gas ejected from the connecting pipe 41, so that the flue gas is vortexed and fully mixed with the fuel.

[0063] The return pipe 2 includes a duct 21 and a bell pipe 26. One end of the duct 21 is equipped with an inner guide pipe 27. The duct 21, the inner guide pipe 27 and the bell pipe 26 are combined in the shape of a Venturi tube for autonomously drawing in flue gas and mixing it thoroughly with fuel.

[0064] The return pipe fitting 2 also includes a conical shell 22, on the outer surface of which a radiating block 23 is provided. One end of the horn tube 26 is provided with a guide ring tube 25, which is fixed to the inner wall of the conical shell 22. A swirl vane 24 is provided between the guide ring tube 25 and the inner guide tube 27 to guide the flue gas vortex to be ejected.

[0065] It is worth noting that when some of the flue gas inside the flue pipe 6 is sent into the space between the conical tube 21 and the cone shell 22, the flue gas will be quickly blown into the interior of the trumpet tube 26 through the guidance of the guide ring pipe 25 and the inner guide pipe 27. The swirl vane 24 is used to accelerate the flow speed of the flue gas. The conical tube 21 and the trumpet tube 26 are combined in the shape of a Venturi tube, which increases the pressure of the fuel mixture gas inside the conical tube 21 and the trumpet tube 26 and accelerates the intake of the flue gas between the conical tube 21 and the cone shell 22. The trumpet shape of the trumpet tube 26 can accelerate the fuel mixture gas through the flame control component 3, thereby avoiding uneven mixing of fuel and flue gas, which can lead to local enrichment and cause backfire diffusion.

[0066] The design of the mixing blade 45 causes the flue gas ejected from the connecting pipe 41 to form a vortex flow. This flow pattern breaks the interface between the flue gas and the fuel, increases the contact area between the two, and promotes more thorough mixing. The combination of the constriction pipe 21 and the horn pipe 26 forms a Venturi tube shape, which uses the principle of fluid dynamics to accelerate gas flow and increase the pressure difference, thereby enhancing the efficiency of flue gas intake. It also promotes rapid and uniform mixing of fuel and flue gas under high pressure, avoids local enrichment that could lead to backfire diffusion, and reduces the possibility of excessively high fuel concentration in local areas, thus reducing the risk of backfire.

[0067] Because the fuel and flue gas can be mixed more evenly, a more ideal mixing ratio is formed before entering the combustion zone, which is conducive to complete combustion and reduces the presence of unburned substances. Some of the flue gas is directly sent from the flue pipe 6 to the space between the tube 21 and the cone shell 22. This part of the flue gas carries a certain amount of heat. Reintroducing it into the combustion process can recover this part of the energy, improve the overall combustion efficiency, and reduce energy consumption.

[0068] Example 3, Reference Figures 13 to 18 Further technical solutions for the flame control component 3 shown.

[0069] The flame control assembly 3 includes an installation tube 33, a conical shell 22, and a nozzle tube 21, all mounted on one end of the installation tube 33. A fuel ring 31 is provided on the outer surface of the installation tube 33. Several secondary nozzles 34 arranged in a ring array and communicating with the inside of the fuel ring 31 are provided inside the installation tube 33. The fuel ring 31 is located inside the conical shell 22. An outer tube 32 is provided at one end of the installation tube 33. An inner tube 35 is provided on the inner wall of the outer tube 32. Several exhaust holes 36 arranged in a ring array are provided on the inner wall of the inner tube 35.

[0070] It is worth noting that after the fuel is injected through the fuel conduit 43, the fuel will be sent into the interior of the secondary nozzle 34 through the fuel ring 31. After the fuel is ejected through the secondary nozzle 34, it will mix again with the fuel inside the return pipe 2 to change the fuel distribution concentration in the flue gas, thereby optimizing the flame length. In addition, some of the fuel sent into the outer pipe 32 through the return pipe 2 will be ejected through the exhaust port 36, so that the flame will be replenished with fuel and flue gas mixture again through the exhaust port 36 on the inner pipe 35 during combustion.

[0071] In this process, the fuel first enters the fuel ring 31 through the fuel conduit 43, and then is sprayed out through the secondary nozzle 34 and mixed again with the fuel inside the return pipe 2. This process can adjust the distribution concentration of fuel in the flue gas, ensuring that the fuel is evenly distributed throughout the combustion area and avoiding problems such as excessively high or low local concentrations. Through multiple mixing processes, the uniformity of fuel-flue gas mixing can be improved. Furthermore, by adjusting the amount and angle of fuel injection from the secondary nozzle 34, the flame length can be effectively controlled, preventing problems such as excessively long flames causing damage to the inner wall of the furnace or excessively short flames causing uneven heating.

[0072] The design of the exhaust port 36 allows the fuel and flue gas mixture to be continuously replenished during the flame combustion process, enabling the flame to maintain a stable and efficient combustion state throughout the combustion zone. Moreover, because the fuel is mixed evenly multiple times, the possibility of excessive local fuel concentration is reduced, thereby reducing the probability of backfire and other combustion instability phenomena.

[0073] Example 4, Reference Figures 19 to 22 The embodiment shown provides a first technical solution for the flow guiding mechanism.

[0074] The flow guiding mechanism includes a flame guiding assembly 8, which includes a frame disk 81. The frame disk 81 is installed on the inner wall of the inner tube 35. A plurality of guide tubes 83 of different diameters are provided on one side of the frame disk 81 and are nested together. A plurality of first oblique blades 82 arranged in a ring array are provided inside the frame disk 81, and the first oblique blades 82 are provided on the outer surface of the guide tubes 83. A plurality of through holes 87 are opened inside the frame disk 81.

[0075] It is worth noting that after the fuel is ejected through the secondary nozzle 34, the gas mixture inside the return pipe 2 will be guided out by the first oblique blade 82 to fully mix with the fuel. Moreover, the arrangement of the secondary nozzle 34 and the first oblique blade 82 is as follows: Figure 19 and Figure 20 As shown, fuel is ejected through the secondary nozzle 34 and through the through hole 87. The guide pipe 83, in conjunction with the first oblique blade 82 and the through hole 87, guides the gas mixture to mix with the fuel again. The guide pipe 83 is arranged in a nested pattern so that the fuel and gas mixture mix quickly before being ejected.

[0076] One end of the secondary nozzle 34 is located inside the through hole 87. The inner wall of the guide pipe 83 with the largest diameter is provided with a support frame 84, and the inside of the support frame 84 is provided with a flame concentrator 85.

[0077] When the fuel mixture is guided out by the guide pipe 83, the gas will flow along the surface of the flame concentrator 85. The flame concentrator 85 is shaped as shown in the figure. The cross-section of the flame concentrator 85 is spindle-shaped, which allows the gas to be guided out after passing through the flame concentrator 85. The flame concentrator 85 can optimize the spray shape and length of the flame.

[0078] The design of the first oblique blade 82 helps to change the direction of the gas mixture flow inside the return pipe 2, so that the gas mixture meets the fuel ejected from the secondary nozzle 34 at a specific angle. This increases the contact area between the fuel and the gas mixture, promoting more thorough mixing. The through hole 87 and the guide pipe 83 work together with the first oblique blade 82 to ensure that the fuel and gas mixture can be mixed quickly and efficiently in a short time. The distributed guide pipes 83 not only provide physical constraints but also enhance the degree of turbulence during the mixing process, further improving the mixing efficiency. Furthermore, the spindle-shaped cross-section design of the flame-gathering guide cone 85 allows the gas to flow along its surface and eventually be ejected, which can effectively converge the ejected gas into a more concentrated and stable flame shape, avoiding the problems of flame dispersion or irregularity.

[0079] Furthermore, the flame guide cone 85 can help adjust the length of the flame. By adjusting its shape and size, the extension distance of the flame can be precisely controlled. Since the fuel and gas mixture is guided and mixed multiple times, the possibility of excessive local fuel concentration is reduced, thereby reducing the risk of backfire caused by local enrichment and the possibility of incomplete combustion.

[0080] Example 4, Reference Figure 23 and Figure 24 The embodiment shown provides a second technical solution for the flow guiding mechanism.

[0081] The flow guiding mechanism includes an air guiding component 9, which includes a mounting plate 91. The mounting plate 91 is installed on the inner wall of the inner tube 35. The inner wall of the mounting plate 91 has several circular holes 92 arranged in a ring array. One end of the secondary nozzle 34 extends into the interior of the circular holes 92. Several mixing blades 93 arranged in a ring array are provided on one side of the mounting plate 91.

[0082] It is worth noting that after the fuel is guided out through the secondary nozzle 34, it will be ejected through the circular hole 92. The mixing blades 93 are arranged around the circular hole 92. When the fuel is ejected through the circular hole 92, the mixing blades 93 will guide the gas mixture inside the return pipe 2 to mix fully with the fuel. The mixing blades 93 will guide the gas mixture to be ejected in a vortex shape, thereby optimizing the flame jet shape.

[0083] The design of the mixing blade 93 surrounding the circular hole 92 can effectively guide the gas mixture inside the return pipe 2 to meet and fully mix with the fuel sprayed from the circular hole 92, which can increase the contact area between the fuel and the gas mixture and ensure that the two can reach a better mixing state in a short time.

[0084] The mixing blade 93 guides the gas mixture to be ejected in a vortex, thereby creating a strong turbulence effect, making the fuel and gas mix more evenly and thoroughly. Turbulent mixing can significantly increase the diffusion rate between two substances with large local concentration differences, thereby promoting more effective mixing.

[0085] The vortex airflow generated by the mixing blade 93 forms a more concentrated and stable flame shape. The vortex airflow can better control the development direction and expansion range of the flame, avoiding the problems of flame dispersion or irregular combustion.

[0086] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A heat treatment furnace for processing super austenitic corrosion-resistant stainless steel pipes, comprising a furnace box (1), characterized in that: The furnace box (1) is equipped with a fuel mixing assembly (4) for primary fuel mixing. A blower (5) is provided on one side of the fuel mixing assembly (4). A flue pipe (6) is installed on one side of both the fuel mixing assembly (4) and the blower (5). A fuel pipe (7) is provided on one side of the fuel mixing assembly (4). A return pipe (2) is provided on one side of the fuel mixing assembly (4) to uniformly mix fuel and flue gas and prevent backfire diffusion caused by local enrichment. A flame control assembly (3) is provided at one end of the return pipe (2) to optimize flame length and concentration distribution through secondary fuel mixing. A flow guide mechanism is provided inside the flame control assembly (3) to adjust the fuel injection angle and optimize flame length. The return pipe (2) includes a constriction tube (21) and a horn tube (26). One end of the constriction tube (21) is equipped with an inner guide tube (27). The constriction tube (21), the inner guide tube (27) and the horn tube (26) are combined in the shape of a Venturi tube for autonomously drawing in flue gas and mixing it thoroughly with fuel. The return pipe (2) also includes a conical shell (22), the fuel mixing assembly (4) includes a connecting pipe (41), the connecting pipe (41) is installed on the inner wall of the furnace box (1), and one end of the connecting pipe (41) is connected to the blower (5). The conical shell (22) and the bundled pipe (21) are both installed at one end of the connecting pipe (41), and one end of the flue pipe (6) extends through the connecting pipe (41) into the cavity between the conical shell (22) and the bundled pipe (21). The middle part of the connecting pipe (41) is provided with a central conduit (44) connected to one end of the fuel pipe (7). The outer surface of the central conduit (44) is provided with a number of fuel conduits (43) arranged in a ring array. The inner walls of the number of fuel conduits (43) are provided with a ring nozzle (42), and a number of nozzles (46) arranged in a ring array are provided on one side of the ring nozzle (42). The inner wall of the connecting pipe (41) is provided with a mixing blade (45), and the bundle pipe (21) is sleeved on the outside of the ring spray pipe (42); The flame control assembly (3) includes an installation tube (33), the conical shell (22) and the conical tube (21) are installed together at one end of the installation tube (33), the outer surface of the installation tube (33) is provided with a fuel ring (31), the interior of the installation tube (33) is provided with a number of secondary nozzles (34) arranged in a ring array and communicating with the interior of the fuel ring (31), the fuel ring (31) is located inside the conical shell (22), one end of the installation tube (33) is provided with an outer tube (32), the inner wall of the outer tube (32) is provided with an inner tube (35), the inner wall of the inner tube (35) is provided with a number of exhaust holes (36) arranged in a ring array.

2. The heat treatment furnace for processing super austenitic corrosion-resistant stainless steel tubes according to claim 1, characterized in that: The outer surface of the cone shell (22) is provided with a radiating block (23), and one end of the horn tube (26) is provided with a flow guide ring tube (25). The flow guide ring tube (25) is fixed to the inner wall of the cone shell (22), and a vortex blade (24) is provided between the flow guide ring tube (25) and the inner guide tube (27) to guide the flue gas vortex to be ejected.

3. The heat treatment furnace for processing super austenitic corrosion-resistant stainless steel tubes according to claim 1, characterized in that: The flow guiding mechanism includes a flame guiding assembly (8), which includes a frame disk (81). The frame disk (81) is installed on the inner wall of the inner tube (35). A plurality of guide tubes (83) with different diameters are provided on one side of the frame disk (81) and are nested together. A plurality of first oblique blades (82) are arranged in a ring array inside the frame disk (81), and the first oblique blades (82) are arranged on the outer surface of the guide tubes (83). A plurality of through holes (87) are opened inside the frame disk (81).

4. The heat treatment furnace for processing super austenitic corrosion-resistant stainless steel tubes according to claim 3, characterized in that: One end of the secondary nozzle (34) is located inside the through hole (87), and the inner wall of the guide pipe (83) with the largest diameter is provided with a support frame (84), and the inside of the support frame (84) is provided with a flame-gathering guide cone (85).

5. The heat treatment furnace for processing super austenitic corrosion-resistant stainless steel tubes according to claim 1, characterized in that: The flow guiding mechanism includes an air guiding component (9), which includes a mounting plate (91). The mounting plate (91) is installed on the inner wall of the inner tube (35). The inner wall of the mounting plate (91) has several circular holes (92) arranged in a ring array, and one end of the secondary nozzle (34) extends into the interior of the circular holes (92). A number of mixing blades (93) arranged in a ring array are provided on one side of the mounting plate (91).

6. A method for processing super austenitic corrosion-resistant stainless steel tubes in a heat treatment furnace according to any one of claims 1-5, characterized in that, The specific operating procedures for the heat treatment furnace are as follows: S1. Super austenitic corrosion-resistant stainless steel pipe contains high levels of nickel, molybdenum and chromium alloy elements. The heat treatment furnace used to make the steel pipe needs to precisely control the temperature inside the furnace. The required heat treatment furnace is composed of multiple furnace boxes (1) spliced ​​together, and the temperature inside each furnace box (1) is different. S2. When heating the inside of the furnace box (1), the blower (5) draws the flue gas in the flue pipe (6) and sends it into the inside of the return pipe (2) through the fuel mixing assembly (4). Some of the flue gas inside the flue pipe (6) will be directly discharged into the inside of the return pipe (2). After the flue gas is discharged through the flue pipe (6), the fuel pipe (7) pushes fuel into the inside of the fuel mixing assembly (4). The fuel sprayed by the fuel mixing assembly (4) and the flue gas will be fully mixed inside the return pipe (2). S3, The fuel flue gas mixed inside the return pipe (2) will be discharged through the flame control assembly (3), and the flame control assembly (3) will spray fuel again to adjust the fuel injection angle and optimize the flame length through the flow guide mechanism.

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