A micro premixed nozzle based on a threaded mounting structure

Abstract

This invention relates to a micro-premixed nozzle based on a threaded mounting structure, belonging to the field of clean combustion technology. This invention solves the problem of poor coaxiality in existing micro-premixed nozzles. It includes a nozzle body and a premixing tube arranged coaxially from the inside out. The nozzle body is a microtube structure open at one end and closed at the other. Several fins are fixedly mounted circumferentially on the outer wall of the microtube structure. Each fin's free end is machined with several external threads. A gap exists between every two adjacent fins circumferentially. The premixing tube is open at both ends. An internal thread section is machined coaxially along the circumferential direction on the inner wall of the end of the premixing tube closest to the oxidant inlet. The threaded connection between the nozzle body and the premixing tube is achieved through the engagement of the external threads of the fins with the internal thread section. This invention is used for micro-premixed nozzles.

Description

Technical Field

[0001] This invention relates to a micro-premixed nozzle based on a threaded mounting structure, belonging to the field of clean combustion technology. Background Technology

[0002] Compared to traditional large-scale swirl burners, micro-premixed burners achieve efficient and stable combustion by reducing the size of the nozzle's characteristic structure and increasing the number of nozzles. This allows for better air-fuel mixing in a smaller space and shorter time, and by evenly distributing the flame on the burner end cap surface. Because the high-temperature zone of the micro-premixed burner is smaller and the flame temperature distribution is more uniform, micro-premixed combustion technology can solve the problem of low emissions under high burner parameters.

[0003] However, due to the large number of micro premixed nozzles, the coaxiality of the micro premixed nozzles may be poor during actual processing and assembly due to the influence of processing tolerances. This leads to poor air-fuel mixing and uneven distribution of flame equivalence ratio. Therefore, a new micro premixed nozzle installation structure is urgently needed to solve the problem of poor coaxiality of micro premixed nozzle installation. Summary of the Invention

[0004] The present invention aims to solve the problem of poor coaxiality during installation of existing micro premixed nozzles, and thus provides a micro premixed nozzle based on a threaded mounting structure.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: A micro premixed nozzle based on a threaded mounting structure includes a nozzle body and a premixed tube arranged coaxially from the inside to the outside. The nozzle body is a microtube structure with one end open and the other end closed. The inner cavity of the microtube structure is a fuel channel. Several fins are fixedly mounted on the outer wall of the microtube structure along its circumference. Several external threads are machined on the free end of each fin. There is a gap between each pair of adjacent fins in the circumference. Several spray holes are opened on the side wall of the other end of the microtube structure along its circumference. The spray holes are all connected to the inner cavity. One end of the microtube structure is the fuel inlet end, and the spray holes are the fuel outlet holes. The premixed tube is open at both ends, with one end being the oxidant inlet and the other end being the oxidant outlet. The inner wall of the end of the premixed tube near the oxidant inlet is coaxially machined with an internal thread section along its circumference. The threaded connection between the nozzle body and the premixed tube is achieved by the engagement of the external threads of several fins with the internal thread section. An annular cavity is formed between the microtube structure and the premixed tube, and several nozzles are located inside the premixed tube.

[0006] Furthermore, a clamping plane is machined at one end of the microtube structure.

[0007] Furthermore, the number of clamping planes is at least two, and when the number of clamping planes is two, the two clamping planes are arranged symmetrically.

[0008] Furthermore, several nozzles are located at one end of the microtube structure near its closed end.

[0009] Furthermore, the end of the fin facing the oxidant inlet is flush with the oxidant inlet end of the premixing tube.

[0010] Furthermore, the end of the internal thread section in the premixed tube is coaxially machined with an axial positioning surface for the premixed tube, and the end of each fin facing the nozzle is in contact with the axial positioning surface of the premixed tube.

[0011] Furthermore, the virtual external thread segment formed by the external threads of several fins remains coaxial with the internal thread segment of the premixed tube.

[0012] Furthermore, the number of fins is at least three.

[0013] Furthermore, several fins are evenly distributed circumferentially along the microtubule structure.

[0014] Furthermore, the other end face of the microtubule structure is flush with the other end face of the premixed tube.

[0015] Compared with the prior art, the present invention has the following advantages: In this invention, the installation method to achieve a high degree of coaxiality between the nozzle body and the premixing tube is simple. Furthermore, the nozzle is fixed to the premixing tube by threads, eliminating the need for additional structures to ensure axial fixation. When multiple premixing nozzles are used on the burner, each nozzle can maintain good coaxiality. Attached Figure Description

[0016] Figure 1 This is a three-dimensional partial cross-sectional view of the present invention; Figure 2 This is a three-dimensional partial sectional view of the premixed pipe; Figure 3 This is a three-dimensional partial cross-sectional view of the nozzle body.

[0017] In the picture: 1. Nozzle body; 11. Fuel passage; 12. Fin; 121. External thread; 13. Nozzle hole; 14. Clamping plane; 2. Premix tube; 21. Internal thread section; 3. Premix tube flow channel wall; 4. Premix tube axial positioning surface; 5. Nozzle body axial positioning surface. Detailed Implementation

[0018] Specific implementation method one: Combining Figures 1-3This description of embodiments provides a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. 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.

[0019] A micro premixed nozzle based on a threaded mounting structure includes a nozzle body 1 and a premixed tube 2 arranged coaxially from the inside to the outside. The nozzle body 1 is a microtube structure with one end open and the other end closed. The inner cavity of the microtube structure is a fuel channel 11. Several fins 12 are fixedly mounted on the outer wall of the microtube structure along its circumference. Several external threads 121 are machined on the free end of each fin 12. There is a gap between each pair of adjacent fins 12 in the circumference. Several spray holes 13 are opened on the side wall of the other end of the microtube structure along its circumference. The spray holes 13 are all in communication with the inner cavity. One end of the microtube structure is the fuel inlet end, and the spray holes 13 are the fuel outlet holes. The premixed tube 2 is open at both ends, with one end being the oxidant inlet and the other end being the oxidant outlet. The inner wall of the end of the premixed tube 2 near the oxidant inlet is coaxially machined with an internal thread section 21 along its circumference. The threaded connection between the nozzle body 1 and the premixed tube 2 is achieved by the engagement of the external threads 121 of several fins 12 with the internal thread section 21. An annular cavity is formed between the microtube structure and the premixed tube 2, and several nozzle holes 13 are located inside the premixed tube 2.

[0020] The end of each fin 12 that is fixed to the outer wall of the microtube structure is the fixed end, and the end away from the fixed end is the free end.

[0021] The open end of the nozzle body 1 is the fuel inlet.

[0022] The fuel may be, for example, hydrogen, and the oxidant may be, for example, air.

[0023] There is a gap between each pair of adjacent fins 12 in the circumferential direction to ensure that the oxidant can smoothly enter the premix tube 2 and mix with the fuel.

[0024] The drilling axis of the internal thread section 21 is kept coaxial with the wall surface 3 of the premixed pipe channel.

[0025] The nozzle body 1 is inserted through one end of the premixing tube 2. The annular cavity formed between the outer wall of the microtube structure and the inner wall of the premixing tube 2 is an annular oxidant channel. The oxidant enters the annular oxidant channel from the oxidant inlet end, and the fuel enters the fuel channel 11 from the fuel inlet and then enters the annular oxidant channel through several fuel outlet holes, where it is efficiently mixed with the oxidant. The well-mixed oxidant and fuel mixture is anchored at the outlet of the premixing tube 2, forming a stable flame.

[0026] The threaded connection between the nozzle body 1 and the premix tube 2 is achieved by the engagement of the external thread teeth 121 and the internal thread section 21 of several fins 12, thereby ensuring that the outer wall surface of the microtube structure and the inner wall surface of the premix tube 2 remain coaxial.

[0027] In this invention, the installation method to achieve a high degree of coaxiality between the nozzle body and the premixing tube is simple. Furthermore, the nozzle is fixed to the premixing tube by threads, eliminating the need for additional structures to ensure axial fixation. When multiple premixing nozzles are used on the burner, each nozzle can maintain good coaxiality.

[0028] The micro-premixed nozzle of the present invention can be applied in fields such as gas turbines, aero engines, and boilers.

[0029] One end of the microtube structure is machined with a clamping plane 14. This design allows for the rotational mounting of the micro premix nozzle by providing the clamping plane 14.

[0030] The number of clamping planes 14 is at least two, and when the number of clamping planes 14 is two, the two clamping planes 14 are arranged symmetrically.

[0031] Several nozzles 13 are located at one end of the microtube structure near its closed end. This design arranges the nozzles 13 close to the flame exit side of the micro premixed nozzle, ensuring the formation of a stable flame.

[0032] The end of fin 12 facing the oxidant inlet is flush with the oxidant inlet end of premixing pipe 2. This design ensures that the oxidant flows smoothly into the premixing pipe from the inlet section.

[0033] The end of the internally threaded section 21 in the premixed tube 2 is coaxially machined with a premixed tube axial positioning surface 4. The end of each fin 12 facing the nozzle orifice 13 is in contact with the premixed tube axial positioning surface 4. With this design, the end of each fin 12 facing the nozzle orifice 13 is the nozzle body axial positioning surface 5. The nozzle body axial positioning surface 5 is in contact with the premixed tube axial positioning surface 4, thereby ensuring the relative position of the other end face of the nozzle body 1 and the other end face of the premixed tube 2.

[0034] The virtual external thread segment formed by the external threads 121 of the fins 12 is coaxial with the internal thread segment 21 of the premixing tube 2. This design ensures good coaxiality between the nozzle body and the premixing tube.

[0035] The number of fins 12 is at least three. This design ensures the stability of the nozzle body during installation.

[0036] Several fins 12 are evenly distributed circumferentially along the microtube structure. This design further ensures the coaxiality between the nozzle body 1 and the premixing tube 2.

[0037] The other end face of the microtube structure is flush with the other end face of the premixing tube 2. This design ensures rapid mixing of air and fuel within the annular flow channel.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A micro-premix nozzle based on a threaded mounting structure, characterized by: The nozzle body (1) and the premixing pipe (2) are coaxially arranged from inside to outside, wherein the nozzle body (1) is a micro-pipe structure with one end open and the other end closed, the inner cavity of the micro-pipe structure is a fuel channel (11), the outer wall of the micro-pipe structure is provided with a plurality of fins (12) along the circumference thereof, the free end of each fin (12) is provided with a plurality of external thread teeth (121), there is a gap between each two adjacent fins (12) along the circumference, a plurality of injection holes (13) are formed on the side wall of the other end of the micro-pipe structure along the circumference thereof, and the injection holes (13) are in communication with the inner cavity, one end of the micro-pipe structure is a fuel inlet end, and the injection holes (13) are fuel outlet holes; The premixing pipe (2) is open at both ends, one end is an oxidant inlet end, and the other end is an oxidant outlet end, an inner thread section (21) is coaxially formed on the inner wall of one end of the premixing pipe (2) near the oxidant inlet end along the circumference thereof, the threaded connection between the nozzle body (1) and the premixing pipe (2) is realized through the cooperation of the external thread teeth (121) of the fins (12) and the inner thread section (21), the annular cavity is formed between the micro-pipe structure and the premixing pipe (2), and the injection holes (13) are located inside the premixing pipe (2).

2. A micro-premix nozzle based on a threaded mounting structure according to claim 1, characterized in that: The one end of the micro-pipe structure is provided with a clamping plane (14).

3. A micro-premix nozzle based on a threaded mounting structure according to claim 2, characterized in that: The number of clamping planes (14) is at least two, and when the number of clamping planes (14) is two, the two clamping planes (14) are symmetrically arranged.

4. A micro-premix nozzle based on a threaded mounting structure according to claim 1, characterized in that: The injection holes (13) are located on one end of the micro-pipe structure near the closed end.

5. A micro-premix nozzle based on a threaded mounting structure according to claim 1, characterized in that: The end of the fin (12) facing the oxidant inlet is flush with the oxidant inlet end of the premixing pipe (2).

6. A micro-premix nozzle based on a threaded mounting structure according to claim 1, characterized in that: The end of the inner thread section (21) of the premixing pipe (2) is coaxially provided with a premixing pipe axial positioning surface (4), and the end of each fin (12) facing the injection hole (13) is in contact with the premixing pipe axial positioning surface (4).

7. A micro-premix nozzle based on a threaded mounting structure according to claim 1, characterized in that: The virtual external thread section formed by the external thread teeth (121) of the plurality of fins (12) is coaxial with the inner thread section (21) of the premixing pipe (2).

8. A micro-premix nozzle based on a threaded mounting structure according to claim 1, characterized in that: The number of fins (12) is at least three.

9. A micro-premix nozzle based on a threaded mounting structure according to claim 1, characterized in that: The plurality of fins (12) are uniformly distributed along the circumference of the micro-pipe structure.

10. A micro-premix nozzle based on a threaded mounting structure according to claim 1, characterized in that: The end face of the other end of the micro-pipe structure is flush with the end face of the other end of the premixing pipe (2).

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