Heat treatment furnace and method for processing super austenite corrosion-resistant stainless steel pipe

Abstract

The invention discloses a heat treatment furnace and method for machining a super austenite corrosion-resistant stainless steel pipe, and relates to the technical field of heat treatment furnaces, the heat treatment furnace comprises a furnace box, a fuel mixing assembly for primarily mixing fuel is installed in the furnace box, and an air feeder is arranged on one side of the fuel mixing assembly; and one side of the fuel mixing assembly and one side of the air feeder are jointly provided with a flue pipe. By means of the design of the mixing blades, flue gas sprayed out of the connecting pipe opening forms a vortex flow state, the interface between the flue gas and fuel is broken through in the flowing mode, the contact area between the flue gas and the fuel is increased, and more sufficient mixing is promoted; the gas flow is accelerated and the pressure difference is increased by utilizing the fluid dynamics principle, the efficiency of sucking the flue gas is enhanced, the rapid and uniform mixing of the fuel and the flue gas under high pressure is also promoted, the tempering diffusion caused by local enrichment is avoided, the possibility that the fuel concentration in a local area is too high is reduced, and thus the tempering risk is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of heat treatment furnaces, and in particular to a heat treatment furnace and a method for processing a super austenitic corrosion-resistant stainless steel pipe. Background Art

[0002] For example, the publication number is CN104894359B, and the invention name is a constant-pressure heat treatment furnace for metal plates and strips, including a heat treatment furnace body, a natural gas main pipeline, a combustion air main pipeline, and a plurality of burners arranged inside the heat treatment furnace body along the length of the furnace, each burner in the furnace body is directly connected to the natural gas main pipeline through its own independent natural gas branch pipeline, and each burner is also directly connected to the combustion air main pipeline through its own independent combustion air branch pipeline, and the natural gas main pipeline and the combustion air main pipeline are designed with thickened diameters, so that energy storage tanks are formed inside the two main pipelines. The pipeline layout of the constant-pressure heat treatment furnace is simple, reasonable, low-cost, and introduces the concept of "energy storage tank", which realizes accurate and stable control of the air intake into each burner, achieves the best combustion state of each burner, and thus realizes a significant improvement in energy utilization.

[0003] In the burner combustion system of the heat treatment furnace, it is difficult for the fuel and the flue gas to achieve an ideal mixing state, and it is easy for the fuel concentration in local areas to be too high or too low. In addition, during the heat treatment process, the uneven mixing of the fuel and the flue gas leads to low combustion efficiency, the risk of flashback caused by local enrichment, and unstable flame morphology. Therefore, the present application provides a heat treatment furnace and method for processing super austenitic corrosion-resistant stainless steel pipes to meet the needs. Summary of the invention

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

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a heat treatment furnace for processing super austenitic corrosion-resistant stainless steel pipes, comprising a furnace box, a fuel mixing assembly for primary fuel mixing is installed inside the furnace box, a blower is arranged on one side of the fuel mixing assembly, a flue pipe is installed on one side of the fuel mixing assembly and the blower, a fuel pipe is arranged on one side of the fuel mixing assembly, a reflux pipe is arranged on one side of the fuel mixing assembly for uniformly mixing fuel and flue gas to prevent backfire diffusion caused by local enrichment, a flame control assembly for optimizing flame length and concentration distribution for secondary fuel mixing is arranged at one end of the reflux pipe, and a flow guide mechanism for adjusting the fuel injection angle to optimize the flame length is arranged inside the flame control assembly; The reflux pipe fitting includes a flared tube and a trumpet tube. One end of the flared tube is installed with an inner conduit. The flared tube, the inner conduit and the trumpet tube are combined in the shape of a Venturi tube for self - sucking flue gas and fully mixing it with fuel.

[0006] Wherein, the reflux pipe fitting further includes a conical shell. The outer surface of the conical shell is provided with radiation blocks. One end of the trumpet tube is provided with a diversion ring tube. The diversion ring tube is fixed on the inner wall of the conical shell. A swirler for guiding the flue gas to swirl and eject is arranged between the diversion ring tube and the inner conduit.

[0007] Wherein, the fuel mixing assembly includes a connecting pipe orifice. The connecting pipe orifice is installed on the inner wall of the furnace box, and one end of the connecting pipe orifice is connected to a blower. Both the conical shell and the flared tube are installed at one end of the connecting pipe orifice. One end of the flue pipe penetrates through the connecting pipe orifice and extends into the cavity between the conical shell and the flared tube.

[0008] Wherein, a central conduit connected to one end of the fuel pipe is arranged in the middle of the connecting pipe orifice. A plurality of fuel conduits distributed in an annular array are arranged on the outer surface of the central conduit. A ring spray pipe is jointly arranged on the inner walls of the plurality of fuel conduits. And a plurality of spray ports distributed in an annular array are arranged on one side of the ring spray pipe.

[0009] Wherein, mixing blades are arranged on the inner wall of the connecting pipe orifice. The flared tube is sleeved outside the ring spray pipe.

[0010] Wherein, the flame control assembly includes an installation pipe. Both the conical shell and the flared tube are jointly installed at one end of the installation pipe. A fuel ring is arranged on the outer surface of the installation pipe. A plurality of secondary spray pipes distributed in an annular array and communicating with the inside of the fuel ring are arranged inside the installation pipe. The fuel ring is located inside the conical shell. One end of the installation pipe is provided with an outer pipe. An inner pipe is arranged on the inner wall of the outer pipe. A plurality of exhaust holes distributed in an annular array are arranged on the inner wall of the inner pipe.

[0011] Wherein, the diversion mechanism includes a flame guiding assembly. The flame guiding assembly includes a frame disk. The frame disk is installed on the inner wall of the inner pipe. A plurality of guiding pipes with different diameters and sleeved together are arranged on one side of the frame disk. A plurality of first inclined blades distributed in an annular array are arranged inside the frame disk. And the first inclined blades are arranged on the outer surface of the guiding pipes. A plurality of through holes are opened inside the frame disk.

[0012] Wherein, one end of the secondary spray pipe is located inside the through hole. A support frame is arranged on the inner wall of the guiding pipe with the largest diameter among them. And a flame concentrating guide cone is arranged inside the support frame.

[0013] Among them, the diversion mechanism includes an air guide component, the air guide component includes a mounting disc, the mounting disc is installed on the inner wall of the inner pipe, a plurality of circular holes distributed in an annular array are formed in the inner wall of the mounting disc, and one end of the secondary nozzle extends into the interior of the circular hole, and a plurality of mixing blades distributed in an annular array are arranged on one side of the mounting disc.

[0014] The present invention also provides a method for processing a heat treatment furnace for super austenitic corrosion-resistant stainless steel pipes. The specific operation method of the heat treatment furnace is as follows: S1. The super austenitic corrosion-resistant stainless steel pipe contains relatively high nickel, molybdenum and chromium alloy elements. The heat treatment furnace used for manufacturing the steel pipe needs to accurately control the temperature inside the furnace. The required heat treatment furnace is formed by splicing and combining multiple furnace chambers, and the temperature inside each spliced furnace chamber is different; S2. When heating the inside of the furnace chamber, the air blower extracts the flue gas in the flue pipe and sends it into the inside of the reflux pipe fitting through the fuel mixing component, and a part of the flue gas inside the flue pipe will directly be discharged into the inside of the reflux pipe fitting. When the flue gas is discharged through the flue pipe, the fuel pipe pushes fuel into the inside of the fuel mixing component, and the fuel sprayed through the fuel mixing component and the flue gas will be fully mixed inside the reflux pipe fitting; S3. The fuel flue gas mixed inside the reflux pipe fitting will be discharged through the flame control component, and the flame control component will spray fuel again to adjust the fuel injection angle through the diversion mechanism to optimize the flame length.

[0015] In summary, the technical effects and advantages of the present invention are as follows: 1. In the present invention, the design of the mixing blades makes the flue gas ejected from the connection nozzle form a vortex flow state. This flow mode breaks the interface between the flue gas and the fuel, increases the contact area between the two, promotes more sufficient mixing, and the combination of the constriction pipe and the horn pipe forms a Venturi tube shape, which uses the principle of fluid dynamics to accelerate the gas flow and increase the pressure difference, enhancing the efficiency of the flue gas being inhaled, and also promoting the rapid and uniform mixing of the fuel and the flue gas under high pressure to avoid local enrichment leading to the spread of backfire and reducing the possibility of too high fuel concentration in local areas, thereby reducing the risk of backfire.

[0016] 2. In the present invention, the fuel first enters the fuel ring through the fuel conduit, and then is ejected by the secondary nozzle and mixed with the fuel inside the reflux pipe fitting again, which can adjust the distribution concentration of the fuel in the flue gas, ensure the uniform distribution of the fuel throughout the combustion area, avoid the problems of too high or too low local concentration, and can improve the mixing uniformity of the fuel and the flue gas through multiple mixings. And by adjusting the injection amount and injection angle of the fuel from the secondary nozzle, the flame length can be effectively controlled to prevent problems such as damage to the inner wall of the furnace chamber caused by too long a flame or uneven heating caused by too short a flame.

[0017] 3. The design of the first inclined blade in the present invention helps to change the flow direction of the gas mixture inside the reflux pipe fitting, enabling the gas mixture to meet the fuel ejected from the secondary nozzle at a specific angle, which can increase the contact area between the fuel and the gas mixture, promote more thorough mixing. The through holes and the guiding pipes cooperate with the first inclined blade to jointly ensure that the fuel and the gas mixture can be quickly and efficiently mixed in a short time. The sleeved and distributed guiding pipes not only provide physical constraints but also enhance the degree of turbulence during the mixing process, further improving the mixing efficiency. Moreover, the spindle-shaped cross-section design of the flame concentrating cone allows the gas to flow along its surface and finally eject, which can effectively converge the ejected gas into a more concentrated and stable flame shape, avoiding the problems of flame dispersion or irregularity.

[0018] 4. The design of the mixing blades surrounding the round hole in the present invention can effectively guide the gas mixture inside the reflux pipe fitting to meet and fully mix with the fuel ejected from the round hole, which can increase the contact area between the fuel and the gas mixture and ensure that the two can reach a good mixing state in a short time. The mixing blades guide the gas mixture to eject in the form of a vortex, thus forming a strong turbulence effect, making the fuel and the gas mix more evenly and thoroughly. Turbulent mixing can significantly increase the diffusion rate between two substances with a large local concentration difference, thereby promoting more effective mixing. And the vortex air flow generated by the guidance of the mixing blades forms a more concentrated and stable flame shape, and the vortex air flow can better control the development direction and expansion range of the flame, avoiding the problems of flame dispersion or irregular combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 It is a first perspective three-dimensional structural schematic diagram of the heat treatment furnace; Figure 2 It is a second perspective three-dimensional structural schematic diagram of the heat treatment furnace; Figure 3 It is a first perspective three-dimensional connection structural schematic diagram of the burner of the heat treatment furnace; Figure 4 It is a second perspective three-dimensional connection structural schematic diagram of the burner of the heat treatment furnace; Figure 5 It is a first perspective three-dimensional connection structural schematic diagram of the flow guiding mechanism; Figure 6 It is a second perspective three-dimensional connection structural schematic diagram of the flow guiding mechanism; Figure 7 Cross-sectional view of the three-dimensional connection structure of the burner Figure 8 Schematic diagram of the three-dimensional connection structure of the fuel mixing assembly Figure 9 Schematic diagram of the partial three-dimensional connection structure of the fuel mixing assembly Figure 10 Cross-sectional view of the three-dimensional connection structure of the reflux pipe fitting and the fuel mixing assembly from the first perspective Figure 11 Cross-sectional view of the three-dimensional connection structure of the reflux pipe fitting and the fuel mixing assembly from the second perspective Figure 12 Cross-sectional view of the three-dimensional connection structure of the reflux pipe fitting Figure 13 Schematic diagram of the three-dimensional connection structure of the flame control assembly and the fuel mixing assembly Figure 14 Cross-sectional view of the three-dimensional connection structure of the flame control assembly Figure 15 Schematic diagram of the three-dimensional connection structure of the flame control assembly and the gas guide assembly Figure 16 Schematic diagram of the three-dimensional connection structure of the flame control assembly and the flame guide assembly Figure 17 Schematic diagram of the three-dimensional connection structure of the flame control assembly from the first perspective Figure 18 Schematic diagram of the three-dimensional connection structure of the flame control assembly from the second perspective Figure 19 Schematic diagram of the three-dimensional connection structure of the flame guide assembly Figure 20 Cross-sectional view of the three-dimensional connection structure of the flame guide assembly Figure 21 Schematic diagram of the three-dimensional connection structure of the frame plate Figure 22 Schematic diagram of the three-dimensional connection structure of the flame concentrating guide cone Figure 23 Schematic diagram of the three-dimensional connection structure of the flame control assembly and the secondary nozzle Figure 24 Schematic diagram of the three-dimensional connection structure of the flame control assembly

[0021] In the figure: 1. Furnace box; 2. Return pipe fitting; 21. Mouth-binding pipe; 22. Conical shell; 23. Radiation block; 24. Rotating blade; 25. Guide ring pipe; 26. Flaring pipe; 27. Inner conduit; 3. Flame control assembly; 31. Fuel ring; 32. Outer pipe; 33. Installation pipe; 34. Secondary spray pipe; 35. Inner pipe; 36. Exhaust hole; 4. Fuel mixing assembly; 41. Connecting pipe orifice; 42. Ring spray pipe; 43. Fuel conduit; 44. Central conduit; 45. Mixing blade; 46. Spray orifice; 5. Blower; 6. Flue pipe; 7. Fuel pipe; 8. Flame guiding assembly; 81. Frame disc; 82. First inclined blade; 83. Guide pipe; 84. Support frame; 85. Flame concentrating guide cone; 87. Through hole; 9. Air guiding assembly; 91. Installation disc; 92. Round hole; 93. Mixing blade. Specific embodiments

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] Embodiment 1. Refer to Figures 1 to 24 A heat treatment furnace and method for processing super-austenitic corrosion-resistant stainless steel pipes as shown, including a furnace box 1. Inside the furnace box 1, a fuel mixing assembly 4 for initially mixing fuel is installed. On one side of the fuel mixing assembly 4, a blower 5 is provided. On one side of the fuel mixing assembly 4 and the blower 5, a flue pipe 6 is commonly installed. On one side of the fuel mixing assembly 4, a fuel pipe 7 is provided. On one side of the fuel mixing assembly 4, a return pipe fitting 2 for uniformly mixing fuel and flue gas to prevent backfire diffusion caused by local enrichment is provided. One end of the return pipe fitting 2 is provided with a flame control assembly 3 for optimizing the flame length and concentration distribution through secondary fuel mixing. Inside the flame control assembly 3, a flow guiding mechanism for adjusting the fuel injection angle to optimize the flame length is provided; It should be noted that super-austenitic corrosion-resistant stainless steel pipes contain relatively high alloy elements such as nickel, molybdenum, and chromium. The heat treatment furnace used for manufacturing steel pipes needs to accurately 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 spliced furnace box 1 is different, and the temperature inside each furnace box 1 can be independently adjusted. During the production process of super-austenitic stainless steel pipes, different heat treatment stages require different temperature settings; When heating the inside of the furnace box 1, the blower 5 extracts the flue gas in the flue pipe 6 and sends it into the inside of the reflux pipe fitting 2 through the fuel mixing assembly 4, and a part of the flue gas inside the flue pipe 6 will be directly discharged into the inside of the reflux pipe fitting 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, and the fuel ejected through the fuel mixing assembly 4 and the flue gas will be fully mixed inside the reflux pipe fitting 2; Among them, the flue gas and the fuel are mixed through the fuel mixing assembly 4 and then mixed through the reflux pipe fitting 2, so as to prevent the uniform mixing of the fuel and the flue gas and prevent the backfire diffusion caused by local enrichment.

[0024] The fuel and flue gas mixed inside the reflux pipe fitting 2 will be discharged through the flame control assembly 3, and the flame control assembly 3 will eject fuel again to adjust the fuel injection angle through the diversion mechanism to optimize the flame length.

[0025] Among them, by ejecting fuel again through the flame control assembly 3 and using the diversion mechanism to adjust the injection angle, the flame length and distribution can be further optimized, ensuring that the heat is evenly distributed in the furnace box 1, thereby improving the consistency and stability of the temperature.

[0026] Embodiment 2. Refer to Figures 7 to 12 The further technical solutions of the fuel mixing assembly 4 and the reflux pipe fitting 2 shown.

[0027] The fuel mixing assembly 4 includes a connecting pipe orifice 41, the connecting pipe orifice 41 is installed on the inner wall of the furnace box 1, and one end of the connecting pipe orifice 41 is connected to the blower 5. The conical shell 22 and the necking pipe 21 are both installed at one end of the connecting pipe orifice 41, and one end of the flue pipe 6 penetrates through the connecting pipe orifice 41 and extends into the cavity between the conical shell 22 and the necking pipe 21.

[0028] A central conduit 44 connected to one end of the fuel pipe 7 is provided in the middle of the connecting pipe orifice 41. A plurality of fuel conduits 43 are arranged in an annular array on the outer surface of the central conduit 44. A ring spray pipe 42 is provided on the inner walls of the plurality of fuel conduits 43 together, and a plurality of spray openings 46 are arranged in an annular array on one side of the ring spray pipe 42.

[0029] It should be noted that the flue gas inside the flue pipe 6 is sucked by the blower 5 and sprayed into the inside of the connecting pipe orifice 41, while the fuel pipe 7 sprays fuel into the inside of the central conduit 44. The fuel will be ejected through the fuel conduits 43. The fuel entering the inside of the fuel conduits 43 will be adjusted by the internal control valve to enter the ring spray pipe 42 and the flame control assembly 3. Part of the fuel inside the fuel conduits 43 will be sent into the inside of the ring spray pipe 42 and finally ejected through the spray openings 46.

[0030] The inner wall of the connecting pipe orifice 41 is provided with mixing blades 45, and the necking pipe 21 is sleeved outside the ring spray pipe 42.

[0031] Among them, the fuel ejected through the nozzle 46 will be mixed with the flue gas ejected from the connecting pipe orifice 41, and the arranged mixing blades 45 are used to change the flow direction of the flue gas ejected from the connecting pipe orifice 41, so that the flue gas is mixed with the fuel fully in a vortex form.

[0032] The reflux pipe fitting 2 includes a converging pipe 21 and a flaring pipe 26. One end of the converging pipe 21 is installed with an inner conduit 27. The converging pipe 21, the inner conduit 27 and the flaring pipe 26 are combined into a Venturi tube shape to autonomously suck in flue gas and mix it fully with the fuel.

[0033] The reflux pipe fitting 2 further includes a conical shell 22. The outer surface of the conical shell 22 is provided with radiation blocks 23. One end of the flaring pipe 26 is provided with a diversion ring pipe 25. The diversion ring pipe 25 is fixed on the inner wall of the conical shell 22. A swirl blade 24 for guiding the flue gas to eject in a vortex is arranged between the diversion ring pipe 25 and the inner conduit 27.

[0034] It should be noted that when part of the flue gas inside the flue pipe 6 is sent between the converging pipe 21 and the conical shell 22, the flue gas will be quickly blown into the inside of the flaring pipe 26 through the guidance of the diversion ring pipe 25 and the inner conduit 27. The arranged swirl blade 24 is used to accelerate the flow rate of the flue gas. And the converging pipe 21 and the flaring pipe 26 are combined into a Venturi tube shape, so that the pressure of the fuel mixture gas inside the converging pipe 21 and the flaring pipe 26 increases and autonomously accelerates to suck in the flue gas between the converging pipe 21 and the conical shell 22. And the flaring shape of the flaring pipe 26 can accelerate the fuel mixture gas to be blown through the flame control component 3, thereby avoiding the backfire diffusion caused by uneven mixing of fuel and flue gas resulting in local enrichment.

[0035] Among them, the design of the mixing blades 45 makes the flue gas ejected from the connecting pipe orifice 41 form a vortex flow pattern. This flow mode breaks the interface between the flue gas and the fuel, increases the contact area between the two, and promotes more sufficient mixing. And the converging pipe 21 and the flaring pipe 26 are combined into a Venturi tube shape, using the principle of fluid dynamics to accelerate the gas flow and increase the pressure difference, enhancing the efficiency of the flue gas being sucked in, and also promoting the rapid and uniform mixing of the fuel and the flue gas under high pressure to avoid local enrichment leading to backfire diffusion, reducing the possibility of too high fuel concentration in local areas, thereby reducing the risk of backfire.

[0036] Since the fuel and the flue gas can be mixed more evenly, an ideal mixing ratio has been formed before entering the combustion zone, which is conducive to achieving complete combustion, reducing the existence of unburned substances. And part of the flue gas is directly sent from the flue pipe 6 between the converging pipe 21 and the conical 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.

[0037] Example Three. Refer to Figures 13 to 18The further technical solution of the flame control assembly 3 shown.

[0038] The flame control assembly 3 includes an installation pipe 33. The conical shell 22 and the flaring pipe 21 are jointly installed at one end of the installation pipe 33. A fuel ring 31 is arranged on the outer surface of the installation pipe 33. A plurality of secondary nozzles 34 are arranged inside the installation pipe 33 in an annular array distribution and communicate with the inside of the fuel ring 31. The fuel ring 31 is located inside the conical shell 22. An outer pipe 32 is arranged at one end of the installation pipe 33. An inner pipe 35 is arranged on the inner wall of the outer pipe 32. A plurality of exhaust holes 36 are arranged on the inner wall of the inner pipe 35 in an annular array distribution.

[0039] It should be noted that when the fuel is blown 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 be mixed with the fuel inside the reflux pipe fitting 2 again to change the distribution concentration of the fuel in the flue gas, so as to optimize the length of the flame. And part of the fuel sent into the outer pipe 32 through the reflux pipe fitting 2 will be ejected through the exhaust holes 36, so that the flame can replenish the mixed gas of fuel and flue gas again through the exhaust holes 36 opened on the inner pipe 35 during the combustion process.

[0040] Among them, the fuel first enters the fuel ring 31 through the fuel conduit 43, and then is ejected through the secondary nozzle 34 and mixed with the fuel inside the reflux pipe fitting 2 again, which can adjust the distribution concentration of the fuel in the flue gas, ensure the uniform distribution of the fuel in the entire combustion area, and avoid the problems of too high or too low local concentration. Through multiple mixings, the mixing uniformity of the fuel and the flue gas can be improved, and by adjusting the injection amount and injection angle of the fuel from the secondary nozzle 34, the flame length can be effectively controlled, preventing problems such as damage to the inner wall of the furnace due to too long a flame or uneven heating due to too short a flame.

[0041] The design of the exhaust holes 36 allows the continuous replenishment of the mixed gas of fuel and flue gas during the flame combustion process, enabling the flame to maintain a stable and efficient combustion state throughout the combustion area. Moreover, since the fuel is evenly mixed multiple times, the possibility of too high local fuel concentration is reduced, thereby reducing the occurrence probability of flashback and other combustion instability phenomena.

[0042] Example Four. Refer to Figures 19 to 22 The first technical solution of the diversion mechanism provided by this example is shown.

[0043] The diversion mechanism includes a flame guiding assembly 8. The flame guiding assembly 8 includes a frame plate 81. The frame plate 81 is installed on the inner wall of the inner pipe 35. A plurality of guiding pipes 83 with different diameters and sleeved together are arranged on one side of the frame plate 81. A plurality of first inclined blades 82 are arranged inside the frame plate 81 in an annular array distribution, and the first inclined blades 82 are arranged on the outer surface of the guiding pipes 83. A plurality of through holes 87 are opened inside the frame plate 81.

[0044] It should be noted that after the fuel is ejected through the secondary nozzle 34, the gas mixture inside the reflux pipe fitting 2 will be ejected through the guidance of the first inclined vane 82 and mixed fully with the fuel. Moreover, the arrangement of the secondary nozzle 34 and the first inclined vane 82 is in the form of Figure 19 and Figure 20 As shown, the fuel is ejected through the secondary nozzle 34 and passes through the through hole 87. The guiding pipe 83 cooperates with the first inclined vane 82 and the through hole 87 to guide the gas mixture to be mixed with the fuel again. And the guiding pipe 83 is arranged in a sleeved manner so that the fuel and the gas mixture are ejected after being quickly mixed.

[0045] One end of the secondary nozzle 34 is located inside the through hole 87. A support frame 84 is arranged on the inner wall of the guiding pipe 83 with the largest diameter, and a flame concentrating guide cone 85 is arranged inside the support frame 84.

[0046] Among them, when the guiding pipe 83 guides the fuel mixture to be ejected, the ejected gas will flow along the surface of the flame concentrating guide cone 85. And the flame concentrating guide cone 85 is in the shape shown in the figure of the flame concentrating guide cone 85. The cross-section of the flame concentrating guide cone 85 is spindle-shaped, which can allow the gas to be ejected after being guided by the flame concentrating guide cone 85. Through the flame concentrating guide cone 85, the spraying shape and length of the flame can be optimized.

[0047] Among them, the design of the first inclined vane 82 helps to change the flow direction of the gas mixture inside the reflux pipe fitting 2, so that the gas mixture meets the fuel ejected from the secondary nozzle 34 at a specific angle, which can increase the contact area between the fuel and the gas mixture and promote more sufficient mixing. The through hole 87 and the guiding pipe 83 cooperate with the first inclined vane 82 to jointly ensure that the fuel and the gas mixture can be quickly and efficiently mixed in a short time. The sleeved guiding pipe 83 not only provides physical constraints, but also enhances the degree of turbulence during the mixing process, further improving the mixing efficiency. And the spindle-shaped cross-section design of the flame concentrating guide cone 85 allows the gas to flow along its surface and finally 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.

[0048] Moreover, the flame concentrating guide cone 85 can also help to 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 the gas mixture are guided and mixed multiple times, the possibility of too high local fuel concentration is reduced, thereby reducing the risk of flashback caused by local enrichment and the possibility of incomplete combustion.

[0049] Example 4. Refer to Figure 23 and Figure 24 As shown, this example provides the second technical solution of the diversion mechanism.

[0050] The flow guiding mechanism includes an air guiding component 9. The air guiding component 9 includes a mounting plate 91 which is mounted on the inner wall of the inner tube 35. A plurality of circular holes 92 distributed in an annular array are formed in the inner wall of the mounting plate 91, and one end of the secondary nozzle 34 extends into the interior of the circular holes 92. A plurality of mixing vanes 93 distributed in an annular array are arranged on one side of the mounting plate 91.

[0051] It should be noted that after the fuel is guided and ejected through the secondary nozzle 34, it will be ejected through the circular holes 92, and the arranged mixing vanes 93 surround the circular holes 92. When the fuel is ejected through the circular holes 92, the mixing vanes 93 will guide the gas mixture inside the reflux pipe fitting 2 to be fully mixed with the fuel, and the mixing vanes 93 will guide the gas mixture to be ejected in a vortex form, and the injection shape of the flame is optimized through the guidance of the mixing vanes 93.

[0052] Among them, the design that the mixing vanes 93 surround the circular holes 92 can effectively guide the gas mixture inside the reflux pipe fitting 2 to meet and be fully mixed with the fuel ejected from the circular holes 92, which can increase the contact area between the fuel and the gas mixture and ensure that the two can reach a good mixing state in a short time.

[0053] The mixing vanes 93 guide the gas mixture to be ejected in a vortex form, thereby forming a strong turbulence effect, making the fuel and the gas mix more evenly and thoroughly. Turbulent mixing can significantly increase the diffusion rate between two substances with a large local concentration difference, thereby promoting more effective mixing.

[0054] And the vortex air flow generated by the guidance of the mixing vanes 93 forms a more concentrated and stable flame shape. The vortex air flow can better control the development direction and expansion range of the flame, avoiding the problems of flame dispersion or irregular combustion.

[0055] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in 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: 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 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 reflux pipe (2) is provided on one side of the fuel mixing assembly (4) for uniformly mixing fuel and flue gas to prevent flashback diffusion caused by local enrichment; a flame control assembly (3) is provided at one end of the reflux pipe (2) for secondary fuel mixing to optimize flame length and concentration distribution; a flow guide mechanism for adjusting the fuel injection angle to optimize flame length is provided inside the flame control assembly (3); The return pipe member (2) comprises a constricted pipe (21) and a bell pipe (26); an inner conduit (27) is installed at one end of the constricted pipe (21); the constricted pipe (21), the inner conduit (27) and the bell pipe (26) are combined into a venturi tube shape for autonomously sucking in smoke and fully mixing it with fuel.

2. A heat treatment furnace for processing super austenitic corrosion-resistant stainless steel pipe according to claim 1, characterized in that: The return pipe member (2) further comprises a cone shell (22), the outer surface of which is provided with a radiation block (23), one end of the bell pipe (26) is provided with a guide ring pipe (25), the guide ring pipe (25) is fixed to the inner wall of the cone shell (22), and a swirl vane (24) is provided between the guide ring pipe (25) and the inner conduit (27) for guiding the smoke vortex to be ejected.

3. A heat treatment furnace for processing super austenitic corrosion-resistant stainless steel pipe according to claim 2, characterized in that: The fuel mixing assembly (4) comprises a connecting pipe opening (41), the connecting pipe opening (41) being mounted on the inner wall of the furnace box (1), and one end of the connecting pipe opening (41) being connected to the blower (5), the cone shell (22) and the bundled pipe (21) being mounted on one end of the connecting pipe opening (41), and one end of the flue pipe (6) passing through the connecting pipe opening (41) and extending into a cavity between the cone shell (22) and the bundled pipe (21).

4. A heat treatment furnace for processing super austenitic corrosion-resistant stainless steel pipe according to claim 3, characterized in that: A central conduit (44) connected to one end of a fuel pipe (7) is provided in the middle of the connecting pipe opening (41); a plurality of fuel conduits (43) distributed in an annular array are provided on the outer surface of the central conduit (44); an annular nozzle (42) is commonly provided on the inner walls of the plurality of fuel conduits (43); and a plurality of nozzles (46) distributed in an annular array are provided on one side of the annular nozzle (42).

5. A heat treatment furnace for processing super austenitic corrosion-resistant stainless steel pipe according to claim 4, characterized in that: The inner wall of the connecting pipe opening (41) is provided with a mixing blade (45), and the constricting pipe (21) is sleeved on the outside of the annular nozzle (42).

6. The heat treatment furnace for processing super austenitic corrosion-resistant stainless steel pipe according to claim 2, characterized in that: The flame control assembly (3) comprises a mounting tube (33), the cone shell (22) and the conical tube (21) are mounted together at one end of the mounting tube (33), a fuel ring (31) is arranged on the outer surface of the mounting tube (33), a plurality of secondary nozzles (34) distributed in an annular array and communicating with the interior of the fuel ring (31) are arranged inside the mounting tube (33), the fuel ring (31) is located inside the cone shell (22), an outer tube (32) is arranged at one end of the mounting tube (33), an inner tube (35) is arranged on the inner wall of the outer tube (32), and a plurality of exhaust holes (36) distributed in an annular array are arranged on the inner wall of the inner tube (35).

7. The heat treatment furnace for processing super austenitic corrosion-resistant stainless steel pipe according to claim 6, characterized in that: The flow guide mechanism comprises a flame guide assembly (8), the flame guide assembly (8) comprising a frame plate (81), the frame plate (81) being mounted on the inner wall of the inner tube (35), a plurality of guide tubes (83) having different diameters and being sleeved together being arranged on one side of the frame plate (81), a plurality of first inclined blades (82) distributed in a ring array being arranged inside the frame plate (81), and the first inclined blades (82) being arranged on the outer surface of the guide tube (83), and a plurality of through holes (87) being opened inside the frame plate (81).

8. The heat treatment furnace for processing super austenitic corrosion-resistant stainless steel pipe according to claim 7, characterized in that: One end of the secondary nozzle (34) is located inside the through hole (87), wherein a support frame (84) is provided on the inner wall of a guide tube (83) with the largest diameter, and a flame focusing guide cone (85) is provided inside the support frame (84).

9. The heat treatment furnace for processing super austenitic corrosion-resistant stainless steel pipe according to claim 6, characterized in that: The flow guide mechanism comprises an air guide component (9), the air guide component (9) comprises a mounting plate (91), the mounting plate (91) is mounted on the inner wall of the inner tube (35), a plurality of circular holes (92) distributed in a circular array are formed on the inner wall of the mounting plate (91), one end of the secondary nozzle (34) extends into the interior of the circular hole (92), and a plurality of mixing blades (93) distributed in a circular array are provided on one side of the mounting plate (91).

10. A method for processing a heat treatment furnace for a super austenitic corrosion-resistant stainless steel pipe according to any one of claims 1 to 9, characterized in that: The specific operation method of the heat treatment furnace is as follows: S1. Super austenitic corrosion-resistant stainless steel pipes contain relatively high levels of nickel, molybdenum and chromium alloy elements, and the heat treatment furnace used to make the steel pipes requires precise control of the temperature inside the furnace. The required heat treatment furnace is composed of multiple furnace boxes (1) spliced ​​together, and the temperature inside each spliced ​​furnace box (1) is different. S2. When the temperature inside the furnace box (1) is raised, the blower (5) extracts the flue gas in the flue pipe (6) and sends it into the interior of the return pipe (2) through the fuel mixing assembly (4), and part of the flue gas inside the flue pipe (6) is directly discharged into the interior of the return pipe (2). After the flue gas is discharged through the flue pipe (6), the fuel pipe (7) pushes the fuel into the interior of the fuel mixing assembly (4), and the fuel and the flue gas sprayed out by the fuel mixing assembly (4) are fully mixed in the interior of the return pipe (2); S3. The fuel and smoke mixed inside the return pipe (2) are discharged through the flame control component (3), and the flame control component (3) sprays fuel again through the guide mechanism to adjust the fuel injection angle to optimize the flame length.

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