A stable flame type low-nitrogen combustion chamber

Abstract

The application discloses a stable flame type low-nitrogen combustion chamber and relates to the technical field of stable flame control. The stable flame type low-nitrogen combustion chamber comprises a base, an outer shell fixedly connected with the base, a combustion pipe fixedly connected with the base, a stable flame device for stabilizing the flame inside the combustion chamber, a release fixing plate which is extended and inserted into a clamping groove on the inner wall of the combustion pipe, so that the stable flame ring will not rotate and deviate or axially move when being impacted by high-speed airflow with a speed of up to hundreds of meters per second, and stable flame failure caused by mechanical loosening is avoided. In low-nitrogen combustion, the guide angle and position of the stable flame ring directly affect the swirling intensity and the backflow area form, and if the stable flame ring is displaced by microns, the backflow area may be deviated, local high temperature or flame may be caused, high-strength mechanical fixation is provided for the high-precision flow field required by low-nitrogen combustion, and the stability of emission is ensured.

Description

Technical Field

[0001] This invention relates to the field of flame stabilization control technology, specifically to a flame stabilization type low-NOx combustion chamber. Background Technology

[0002] In the fields of gas turbines, industrial boilers, and distributed energy power equipment, the combustion chamber, as a core hot-end component, directly determines the efficiency, emission levels, and operational reliability of the entire system. With increasingly stringent global environmental regulations and continuously decreasing limits for nitrogen oxide (NOx) emissions, developing low-NOx combustion chambers that combine stable combustion with low emissions has become a key focus of technological development in the industry.

[0003] While existing flame-stabilized low-NOx combustion chambers can stabilize the flame using flame stabilizing rings and reduce NOx emissions to meet environmental requirements through low-NOx combustion technology, they lack the high-precision anti-loosening function of the flame stabilizing rings. During combustion chamber operation, the internal airflow velocity is extremely high, accompanied by strong mechanical vibration and thermal expansion. Traditional flame stabilizing ring installation methods often rely on simple snap-fitting or single-point locking. Under prolonged high-temperature and high-scouring environments, this method easily leads to micron-level circumferential rotational displacement or axial movement of the flame stabilizing ring. The guide angle and spatial position of the flame stabilizing ring directly determine the swirl intensity and the morphology of the recirculation zone. Even a slight displacement of the flame stabilizing ring can cause displacement and distortion in the recirculation zone, potentially leading to localized hot spots or flame detachment. This not only disrupts the precise flow field required for low-NOx combustion, causing a sharp deterioration in NOx emissions, but also results in uneven heat load on the combustion chamber walls due to flame instability, thus shortening the combustion chamber's service life. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a flame-stabilized low-NOx combustion chamber, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a flame-stabilized low-NOx combustion chamber, comprising a base, a shell fixedly connected to the base, a combustion tube fixedly connected to the base, a feed head disposed at the tail end of the base, and an air inlet opened on the outer wall of the shell. The flame-stabilized low-NOx combustion chamber further comprises: a flame-stabilizing device for stabilizing the flame inside the combustion chamber, an auxiliary device for making the flame-stabilizing effect change with the gas flow rate, and a control device for controlling the fuel input. The flame stabilizing device includes a fixed frame fixedly connected to the inner wall of the combustion tube, a flame stabilizing ring disposed on the inner wall of the combustion tube, a rotating ring slidably connected to the flame stabilizing ring, a key slidably penetrating the surface of the rotating ring, a sliding ring fixedly connected to the key, and a positioning plate fixedly connected to the rotating ring. The fixed frame is provided with a slide on the side near the flame stabilizing ring, the flame stabilizing ring is provided with a sliding groove on the side near the slide, the flame stabilizing ring is provided with a slot on the side near the key, the key contacts the inner wall of the slot, the slide is provided with a limiting groove on the side near the positioning plate, and the positioning plate is provided with a protrusion on the side near the limiting groove. The flame stabilizing device further includes a sliding key slidably connected to the inner wall of the flame stabilizing ring, a fixed plate slidably connected to the inner wall of the flame stabilizing ring, and a positioning member sliding on the inner wall of the fixed plate. A sliding groove is provided on the side of the flame stabilizing ring near the sliding key. The sliding key contacts the inner wall of the sliding groove, and the positioning member contacts the inner wall of the sliding groove. A retaining groove is provided on the side of the inner wall of the combustion tube near the fixed plate.

[0006] Preferably, the key matches the sliding groove, and an elastic element is provided between the positioning member and the fixed plate. The elastic element is provided to drive the positioning member to insert into the flame stabilizing ring. An elastic element is provided between the fixed plate and the flame stabilizing ring. The elastic element is provided to push the fixed plate to move towards the combustion tube. An elastic element is provided between the sliding ring and the rotating ring. The elastic element is provided to drive the sliding ring to move towards the rotating ring. The elastic element is a high-temperature resistant compression spring.

[0007] Preferably, the auxiliary device includes an adjusting plate rotatably connected to the flame stabilizing ring, a fixed base fixedly connected to the adjusting plate, a sliding base slidably connected to the flame stabilizing ring, a connecting rod rotatably connecting the fixed base and the sliding base, and a telescopic member sliding on the inner wall of the sliding base. The outer wall of the flame stabilizing ring has a through groove and a guide groove. The adjusting plate is rotatably connected to the inner wall of the guide groove. The side of the flame stabilizing ring near the telescopic member has a friction groove, and the telescopic member contacts the inner wall of the friction groove.

[0008] Preferably, the auxiliary device further includes a pressure block fixedly connected to the rotating ring, a slider sliding on the inner wall of the flame stabilizing ring, and a limiting key sliding on the inner wall of the flame stabilizing ring. The adjusting plate has a slot on the side near the limiting key, and the limiting key contacts the inner wall of the slot.

[0009] Preferably, an elastic element is provided between the telescopic member and the sliding seat. The elastic element is provided to drive the telescopic member to slide towards the flame stabilizing ring. A torsion spring is provided between the adjusting plate and the flame stabilizing ring. The torsion spring is provided to drive the adjusting plate to rotate. The side of the telescopic member near the friction groove is set as an inclined surface. An elastic element is provided between the slider and the flame stabilizing ring. The elastic element is provided to drive the slider to move away from the limit key. An elastic element is provided between the limit key and the flame stabilizing ring. The elastic element is provided to drive the limit key to release the limit on the adjusting plate. The side of the slider near the limit key is set as an inclined surface. Both the elastic element and the torsion spring are high-temperature resistant compression springs. The side of the telescopic member near the friction groove is set as an inclined surface. The angle between the inclined surface and the horizontal plane is 30°.

[0010] Preferably, the control device includes a sliding arc plate slidably connected to the feed head, a sliding head slidably connected to the feed head, an inner ring rotating on the inner wall of the sliding head, a second sealing plate fixedly connected to the sliding head, a first sealing plate fixedly connected to the inner ring, and a sliding block fixedly connected to the inner ring. Both the second and first sealing plates have air venting grooves on their surfaces, and the air venting grooves on the surface of the first and second sealing plates are staggered. The outer wall of the feed head has a spiral-shaped slide rail, and the sliding block is slidably connected to the inner wall of the slide rail. Both the first and second sealing plates have circular grooves.

[0011] Preferably, the control device further includes a telescopic rod disposed on the outer wall of the feed head, a connecting rod rotatably connecting the telescopic rod and the sliding arc plate, a fixing key fixedly connected to the telescopic rod, a fixing rod fixedly connected to the fixing key, and a sealing head sliding on the inner wall of the fixing rod. The sliding head has a slot on the side near the fixing key, and the sealing head contacts the inner wall of the circular slot.

[0012] Preferably, an elastic element is provided between the sliding arc plate and the feed head to drive the sliding arc plate to reset; an elastic element is provided between the sliding head and the feed head to drive the sliding head to reset; and an elastic element is provided between the sealing head and the fixing rod to drive the sealing head to insert into the circular groove. The elastic element is a high-temperature resistant compression spring.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this invention, the rotating ring can move and drive the protruding plate of the positioning plate to embed into the limiting groove of the fixing frame. This action realizes the initial coarse positioning and fixing of the flame stabilizing ring relative to the fixing frame. When the rotating ring rotates to the position, the sliding ring is pushed back to make the key insert into the sliding groove. This locks the rotational freedom of the rotating ring on the one hand, and triggers the linkage between the sliding key and the positioning component on the other hand, releasing the fixing plate so that it extends and inserts into the slot of the inner wall of the combustion tube. This ensures that the flame stabilizing ring will not rotate or move axially when subjected to the impact of high-speed airflow of up to hundreds of meters per second, avoiding flame stabilization failure caused by mechanical loosening. In low-NOx combustion, the guiding angle and position of the flame stabilizing ring directly affect the swirl intensity and the morphology of the recirculation zone. If the flame stabilizing ring undergoes a micron-level displacement, it may lead to recirculation zone displacement, local high temperature or flame detachment. Through high-strength mechanical fixing, a solid guarantee is provided for the high-precision flow field required for low-NOx combustion, ensuring stable emissions.

[0014] 2. In this invention, the regulating plate is not always in an active state. It can only rotate with the airflow after the rotating ring has rotated to the correct position and the pressure block moves to actively unlock it. This design avoids unnecessary shaking or vibration of the regulating plate during the installation of the flame stabilizing ring. After installation, the limit is automatically released, which improves the reliability and lifespan of the system. The telescopic component contacts the inner wall of the friction groove during the sliding seat movement. When the input airflow experiences transient fluctuations, the friction force directly opposes the reset tendency of the sliding seat, thereby slowing down its reset speed. This prevents the rotation angle of the regulating plate from swinging violently with the instantaneous vibration of the airflow, avoiding frequent swinging of the regulating plate due to high-frequency airflow fluctuations. This keeps the guide angle relatively constant and prevents dynamic instability in the return zone and flame root due to guide plate flutter.

[0015] 3. In this invention, the sealing of the sealing head to the circular groove depends on the prerequisite that air is introduced into the air inlet to blow the sliding arc plate. That is, the fuel passage can only be opened when effective purging is performed, avoiding the risk of misoperation of introducing fuel before purging. At the same time, it prevents the residual combustible gas in the furnace from causing a deflagration accident at the moment of ignition. During the ignition stage, only a small amount of fuel is introduced through the circular groove. After ignition, the pressure of the fuel itself is used to push the air outlet grooves on the surfaces of sealing plate one and sealing plate two to overlap, thereby increasing the fuel emission. A stable small ignition source is established with a small amount of fuel first, avoiding violent ignition deflagration when a large flow of fuel is directly introduced. This effectively protects the ignition electrode and the combustion chamber head structure. The flow rate switching is automatically driven by the rise of fuel pressure, rather than the sudden opening of the valve, achieving smooth loading and reducing the sharp fluctuation of flame heat release, which is beneficial to the stability of low-NOx combustion. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2This is a schematic diagram of the position and structure of the feed head and air inlet of the present invention; Figure 3 This is a schematic diagram of the position structure of the fixing frame and flame stabilizing ring of the present invention; Figure 4 This is a schematic diagram of the positioning element and fixing plate position structure of the present invention; Figure 5 This is a schematic diagram of the position structure of the pressure block and slider of the present invention; Figure 6 This is a schematic diagram showing the position and structure of the sliding seat and telescopic component of the present invention; Figure 7 This is a schematic diagram of the position structure of the sliding arc plate and the sliding head of the present invention; Figure 8 This is a schematic diagram of the inner ring and sealing plate structure of the present invention.

[0017] The meanings of the labels in the diagram are as follows: 1. Base; 2. Outer shell; 3. Combustion tube; 4. Feed head; 5. Air inlet; 6. Fixing frame; 7. Flame stabilizing ring; 8. Rotating ring; 9. Sliding ring; 10. Insert key; 11. Sliding key; 12. Positioning component; 13. Fixing plate; 14. Positioning plate; 21. Adjusting plate; 22. Connecting rod; 23. Fixing seat; 24. Sliding seat; 25. Pressure block; 26. Slider; 27. Limiting key; 28. Telescopic component; 31. Sliding arc plate; 32. Sliding head; 33. Inner ring; 34. Sealing plate one; 35. Sealing plate two; 36. Connecting rod; 37. Telescopic rod; 38. Fixing key; 39. Fixing rod; 391. Sealing head; 392. Sliding block. Detailed Implementation

[0018] 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.

[0019] Please see Figures 1-8 One embodiment of the present invention is: a flame-stabilized low-NOx combustion chamber, including a base 1, a shell 2 fixedly connected to the base 1, a combustion tube 3 fixedly connected to the base 1, a feed head 4 disposed at the tail end of the base 1, and an air inlet 5 opened on the outer wall of the shell 2. The flame-stabilized low-NOx combustion chamber further includes: a flame stabilization device for stabilizing the flame inside the combustion chamber, an auxiliary device for making the flame stabilization effect change with the gas flow rate, and a control device for controlling the fuel input. The flame stabilizing device includes a fixed frame 6 fixedly connected to the inner wall of the combustion tube 3, a flame stabilizing ring 7 disposed on the inner wall of the combustion tube 3, a rotating ring 8 slidably connected to the flame stabilizing ring 7, a key 10 slidably penetrating the surface of the rotating ring 8, a sliding ring 9 fixedly connected to the key 10, and a positioning plate 14 fixedly connected to the rotating ring 8. The fixed frame 6 is provided with a slide on the side near the flame stabilizing ring 7, the flame stabilizing ring 7 is provided with a sliding groove on the side near the slide, the flame stabilizing ring 7 is provided with a slot on the side near the key 10, the key 10 contacts the inner wall of the slot, the slide is provided with a limit groove on the side near the positioning plate 14, and the positioning plate 14 is provided with a protrusion on the side near the limit groove.

[0020] The flame stabilizing device also includes a sliding key 11 that is slidably connected to the inner wall of the flame stabilizing ring 7, a fixed plate 13 that is slidably connected to the inner wall of the flame stabilizing ring 7, and a positioning member 12 that slides on the inner wall of the fixed plate 13. A sliding groove is provided on the side of the flame stabilizing ring 7 near the sliding key 11. The sliding key 11 contacts the inner wall of the sliding groove, and the positioning member 12 contacts the inner wall of the sliding groove. A slot is provided on the side of the inner wall of the combustion tube 3 near the fixed plate 13.

[0021] The key 10 matches the sliding groove. An elastic element is provided between the positioning element 12 and the fixing plate 13. The elastic element is provided to drive the positioning element 12 into the flame stabilizing ring 7. An elastic element is provided between the fixing plate 13 and the flame stabilizing ring 7. The elastic element is provided to push the fixing plate 13 towards the combustion tube 3. An elastic element is provided between the sliding ring 9 and the rotating ring 8. The elastic element is provided to drive the sliding ring 9 towards the rotating ring 8.

[0022] In this embodiment, during operation: When using the combustion chamber, the air inlet 5 on the surface of the base 1 introduces air into the combustion tube 3 to pre-clean it. After the base 1 is cleaned, the feed head 4 introduces a small amount of fuel into the combustion tube 3 for ignition. After successful ignition, the fuel output is increased, enabling the machine to operate normally. During operation, the flame stabilizing ring 7 makes the flame inside the combustion tube 3 more stable. During use, the flame stabilizing ring 7 needs to be installed inside the combustion tube 3. The sliding groove inside the flame stabilizing ring 7 contacts the slide of the fixing frame 6, and the flame stabilizing ring 7 is located on the inner wall of the fixing frame 6. At this time, pulling the sliding ring 9 causes the key 10 to move, disengaging it from the flame stabilizing ring 7. When the key 10 makes contact, the limiting position of the rotating ring 8 on the key 10 will be released. At this time, the movement of the sliding ring 9 can drive the rotating ring 8 to move through the key 10. When the rotating ring 8 moves, it will drive the positioning plate 14 to move. The movement of the positioning plate 14 will drive the protrusion to move into the limiting groove on the surface of the fixing frame 6. Then the positioning plate 14 will contact the inside of the limiting groove. The contact between the positioning plate 14 and the limiting groove will fix the fixing frame 6 and the flame stabilizing ring 7. When the rotating ring 8 rotates to the position, it pushes the sliding ring 9 to make the key 10 insert into the sliding groove, thus fixing the rotation of the rotating ring 8. After the key 10 is inserted into the sliding groove, it will push the sliding key 11 to move. The movement of the sliding key 11 will push the positioning member 12 to move into the fixing plate 13. Then the positioning member 12 will move into the fixing plate 13. When the limit of 3 is released, the fixing plate 13 will extend away from the flame stabilizer ring 7 and insert into the slot, strengthening the fixation between the flame stabilizer ring 7 and the combustion tube 3. This allows the through groove and guide groove on the surface of the flame stabilizer ring 7 to stabilize the flame more smoothly. The flame stabilizer ring 7 slides with the slide of the fixing bracket 6 through its internal sliding groove. This design provides clear physical guidance for installation, avoiding blind alignment and significantly reducing installation difficulty and time cost. The rotating ring 8 can move and drive the protruding plate of the positioning plate 14 to embed into the limiting groove of the fixing bracket 6. This action achieves the initial coarse positioning and fixation of the flame stabilizer ring 7 relative to the fixing bracket 6. When the rotating ring 8 is rotated into place, the sliding ring 9 is pushed back to make The key 10 is inserted into the sliding groove, which locks the rotational freedom of the rotating ring 8 on the one hand, and triggers the linkage between the sliding key 11 and the positioning component 12 on the other hand, releasing the fixing plate 13 so that it extends and inserts into the slot on the inner wall of the combustion tube 3. This ensures that the flame stabilizing ring 7 will not rotate or move axially when subjected to high-speed airflow impacts of up to hundreds of meters per second, avoiding flame stabilization failure caused by mechanical loosening. In low-NOx combustion, the guiding angle and position of the flame stabilizing ring 7 directly affect the swirling intensity and the morphology of the recirculation zone. If the flame stabilizing ring 7 undergoes micron-level displacement, it may lead to recirculation zone displacement, local high temperature, or flame detachment. Through high-strength mechanical fixation, a solid guarantee is provided for the high-precision flow field required for low-NOx combustion, ensuring stable emissions.

[0023] Please see Figures 1-8Based on the above embodiments, in another embodiment of the present invention, the auxiliary device includes an adjusting plate 21 rotatably connected to the flame stabilizing ring 7, a fixed seat 23 fixedly connected to the adjusting plate 21, a sliding seat 24 slidably connected to the flame stabilizing ring 7, a connecting rod 22 rotatably connecting the fixed seat 23 and the sliding seat 24, and a telescopic member 28 sliding on the inner wall of the sliding seat 24. The outer wall of the flame stabilizing ring 7 is provided with a through groove and a guide groove. The adjusting plate 21 is rotatably connected to the inner wall of the guide groove. The side of the flame stabilizing ring 7 near the telescopic member 28 is provided with a friction groove. The telescopic member 28 contacts the inner wall of the friction groove.

[0024] The auxiliary device also includes a pressure block 25 fixedly connected to the rotating ring 8, a slider 26 sliding on the inner wall of the flame stabilizing ring 7, and a limit key 27 sliding on the inner wall of the flame stabilizing ring 7. The adjusting plate 21 has a slot on the side near the limit key 27, and the limit key 27 contacts the inner wall of the slot.

[0025] An elastic element is provided between the telescopic component 28 and the sliding seat 24. The elastic element is provided to drive the telescopic component 28 to slide towards the flame stabilizing ring 7. A torsion spring is provided between the adjusting plate 21 and the flame stabilizing ring 7. The torsion spring is provided to drive the adjusting plate 21 to rotate. The side of the telescopic component 28 near the friction groove is set as an inclined surface. An elastic element is provided between the slider 26 and the flame stabilizing ring 7. The elastic element is provided to drive the slider 26 to move away from the limit key 27. An elastic element is provided between the limit key 27 and the flame stabilizing ring 7. The elastic element is provided to drive the limit key 27 to release the limit on the adjusting plate 21. The side of the slider 26 near the limit key 27 is set as an inclined surface.

[0026] The control device includes a sliding arc plate 31 slidably connected to the feed head 4, a sliding head 32 slidably connected to the feed head 4, an inner ring 33 rotating on the inner wall of the sliding head 32, a second sealing plate 35 fixedly connected to the sliding head 32, a first sealing plate 34 fixedly connected to the inner ring 33, and a sliding block 392 fixedly connected to the inner ring 33. Both the second sealing plate 35 and the first sealing plate 34 have air outlet grooves on their surfaces. The air outlet grooves on the surface of the first sealing plate 34 and the surface of the second sealing plate 35 are staggered. The outer wall of the feed head 4 has a slide rail. The sliding block 392 is slidably connected to the inner wall of the slide rail. Both the first sealing plate 34 and the second sealing plate 35 have circular grooves.

[0027] The control device also includes a telescopic rod 37 disposed on the outer wall of the feed head 4, a connecting rod 36 rotatably connecting the telescopic rod 37 and the sliding arc plate 31, a fixing key 38 fixedly connected to the telescopic rod 37, a fixing rod 39 fixedly connected to the fixing key 38, and a sealing head 391 sliding on the inner wall of the fixing rod 39. The sliding head 32 has a slot on the side near the fixing key 38, and the sealing head 391 contacts the inner wall of the circular groove.

[0028] An elastic element is provided between the sliding arc plate 31 and the feed head 4. The elastic element is provided to drive the sliding arc plate 31 to reset. An elastic element is provided between the sliding head 32 and the feed head 4. The elastic element is provided to drive the sliding head 32 to reset. An elastic element is provided between the sealing head 391 and the fixing rod 39. The elastic element is provided to drive the sealing head 391 to insert into the circular groove.

[0029] In this embodiment, when the rotating ring 8 rotates, it drives the pressure block 25 to move. The movement of the pressure block 25 releases the obstruction on the slider 26, causing the slider 26 to move away from the limit key 27. This releases the pressure of the slider 26 on the limit key 27, causing the limit key 27 to move away from the adjusting plate 21. This releases the limit of the limit key 27 on the adjusting plate 21. At this time, the adjusting plate 21 can rotate according to the airflow changes. During operation, the feed head 4 and the air inlet 5 introduce air and fuel into the combustion tube 3. The flame inside the combustion tube 3 is affected by the gas flow rate. When the airflow continuously increases, it pushes the adjusting plate 21 to rotate. The rotation of the adjusting plate 21 drives the fixed seat 23 to move. The movement of the fixed seat 23 pushes the connecting rod 22 to move. The movement of the connecting rod 22 pushes the sliding seat 24 to slide away from the guide groove. When the sliding seat 24 moves, it causes the telescopic member 28 to contact the inner wall of the friction groove. When the airflow input fluctuates, the telescopic member 28... The contact between the telescopic component 28 and the friction groove slows down the reset speed of the sliding seat 24, preventing the regulating plate 21 from undergoing drastic changes during airflow fluctuations. The regulating plate 21 is not always in an active state; it can only rotate with the airflow after the rotating ring 8 has rotated to its position and is actively unlocked by the movement of the pressure block 25. This design avoids unnecessary shaking or vibration of the regulating plate 21 during the installation of the flame stabilizing ring 7. After installation, the limit is automatically released, improving the reliability and lifespan of the system. The telescopic component 28 contacts the inner wall of the friction groove during the displacement of the sliding seat 24. When the input airflow experiences transient fluctuations, the friction force directly opposes the reset tendency of the sliding seat 24, thereby slowing down its reset speed. This prevents the rotation angle of the regulating plate 21 from swinging violently with the instantaneous vibration of the airflow, avoiding frequent swinging of the regulating plate 21 due to high-frequency airflow fluctuations. This maintains a relatively constant guide angle and prevents dynamic instability in the return zone and flame root due to guide plate flutter.

[0030] When air is introduced into the combustion tube 3 through the air inlet 5 for pre-cleaning, it blows the sliding arc plate 31 to move. The movement of the sliding arc plate 31 pushes the telescopic rod 37 away from the sliding head 32 via the connecting rod 36. The movement of the telescopic rod 37 causes the fixing key 38 to move, releasing the limit on the sliding head 32, allowing the sliding head 32 to slide. The movement of the telescopic rod 37 causes the fixing rod 39 to move, which in turn causes the sealing head 391 to move away from the circular groove. The arc surface of the sealing head 391 will contact the circular groove, causing the sealing head 391 to move away from the circular groove. At this time, the seal of the sealing head 391 on the circular groove will be released. The feed head 4 will then introduce a small amount of fuel into the combustion tube 3 through the circular groove for ignition. After ignition, the fuel input will be increased, and the sealing plate 34 will be pushed by the fuel, causing the inner ring 33 and the sliding head 32 to move away from the feed head 4. When the inner ring 33 moves, it will drive the sliding block 392 to slide along the inner wall of the slide. The sliding block 392 will drive the sealing plate 35 to rotate through the inner ring 33. Then the gas outlet groove on the surface of the sealing plate 35 and the sealing plate 34 will overlap, increasing the fuel emission. The sealing head 391 must rely on the air inlet 5 to blow the sliding arc plate 31 to release the seal on the circular groove. That is, the fuel passage can only be opened when the purging is effective. This avoids the risk of misoperation of passing fuel before purging and prevents the residual combustible gas in the furnace from deflagration at the moment of ignition. During the ignition stage, only a small amount of fuel is passed through the circular groove. After ignition, the pressure of the fuel itself is used to push the sealing plate 34 and the gas outlet groove on the surface of the sealing plate 35 to overlap, thereby increasing the fuel emission. A stable small fire source is established with a small amount of fuel first, avoiding violent ignition deflagration when a large flow of fuel is directly passed.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flame-stabilized low-NOx combustion chamber, comprising a base (1), a shell (2) fixedly connected to the base (1), a combustion pipe (3) fixedly connected to the base (1), a feed head (4) disposed at the tail end of the base (1), and an air inlet (5) formed on the outer wall of the shell (2), characterized in that, The flame-stabilizing low-NOx combustion chamber also includes: a flame-stabilizing device for stabilizing the flame inside the combustion chamber, an auxiliary device that allows the flame-stabilizing effect to vary with the gas flow rate, and a control device for controlling the fuel input. The flame stabilizing device includes a fixed frame (6) fixedly connected to the inner wall of the combustion tube (3), a flame stabilizing ring (7) disposed on the inner wall of the combustion tube (3), a rotating ring (8) slidably connected to the flame stabilizing ring (7), a key (10) slidably penetrating the surface of the rotating ring (8), a sliding ring (9) fixedly connected to the key (10), and a positioning plate (14) fixedly connected to the rotating ring (8). The fixed frame (6) is provided with a slide on the side near the flame stabilizing ring (7), the flame stabilizing ring (7) is provided with a sliding groove on the side near the slide, the flame stabilizing ring (7) is provided with a slot on the side near the key (10), the key (10) contacts the inner wall of the slot, the slide is provided with a limiting groove on the side near the positioning plate (14), and the positioning plate (14) is provided with a protrusion on the side near the limiting groove. The flame stabilizing device also includes a sliding key (11) slidably connected to the inner wall of the flame stabilizing ring (7), a fixed plate (13) slidably connected to the inner wall of the flame stabilizing ring (7), and a positioning member (12) sliding on the inner wall of the fixed plate (13). The flame stabilizing ring (7) has a sliding groove on the side near the sliding key (11). The sliding key (11) contacts the inner wall of the sliding groove, and the positioning member (12) contacts the inner wall of the sliding groove. The inner wall of the combustion tube (3) has a slot on the side near the fixed plate (13).

2. The flame-stabilized low-NOx combustion chamber according to claim 1, characterized in that: The key (10) matches the sliding groove, an elastic element is provided between the positioning element (12) and the fixing plate (13), an elastic element is provided between the fixing plate (13) and the flame stabilizing ring (7), and an elastic element is provided between the sliding ring (9) and the rotating ring (8).

3. The flame-stabilized low-NOx combustion chamber according to claim 1, characterized in that: The auxiliary device includes an adjusting plate (21) rotatably connected to the flame stabilizing ring (7), a fixed seat (23) fixedly connected to the adjusting plate (21), a sliding seat (24) slidably connected to the flame stabilizing ring (7), a connecting rod (22) rotatably connecting the fixed seat (23) and the sliding seat (24), and a telescopic member (28) sliding on the inner wall of the sliding seat (24). The outer wall of the flame stabilizing ring (7) is provided with a through groove and a guide groove. The adjusting plate (21) is rotatably connected to the inner wall of the guide groove. The side of the flame stabilizing ring (7) near the telescopic member (28) is provided with a friction groove. The telescopic member (28) contacts the inner wall of the friction groove.

4. The flame-stabilized low-NOx combustion chamber according to claim 3, characterized in that: The auxiliary device also includes a pressure block (25) fixedly connected to the rotating ring (8), a slider (26) sliding on the inner wall of the flame stabilizing ring (7), and a limiting key (27) sliding on the inner wall of the flame stabilizing ring (7). The adjusting plate (21) has a slot on the side near the limiting key (27), and the limiting key (27) contacts the inner wall of the slot.

5. The flame-stabilized low-NOx combustion chamber according to claim 4, characterized in that: An elastic element is provided between the telescopic member (28) and the sliding seat (24), a torsion spring is provided between the adjusting plate (21) and the flame stabilizing ring (7), the side of the telescopic member (28) near the friction groove is set as an inclined surface, an elastic element is provided between the slider (26) and the flame stabilizing ring (7), an elastic element is provided between the limiting key (27) and the flame stabilizing ring (7), and the side of the slider (26) near the limiting key (27) is set as an inclined surface.

6. The flame-stabilized low-NOx combustion chamber according to claim 1, characterized in that: The control device includes a sliding arc plate (31) slidably connected to the feed head (4), a sliding head (32) slidably connected to the feed head (4), an inner ring (33) rotating on the inner wall of the sliding head (32), a second sealing plate (35) fixedly connected to the sliding head (32), a first sealing plate (34) fixedly connected to the inner ring (33), and a sliding block (392) fixedly connected to the inner ring (33). Both the second sealing plate (35) and the first sealing plate (34) have air outlet grooves on their surfaces. The air outlet grooves on the surface of the first sealing plate (34) and the air outlet grooves on the surface of the second sealing plate (35) are staggered. The outer wall of the feed head (4) has a spiral slide. The sliding block (392) is slidably connected to the inner wall of the slide. Both the first sealing plate (34) and the second sealing plate (35) have circular grooves.

7. The flame-stabilized low-NOx combustion chamber according to claim 6, characterized in that: The control device also includes a telescopic rod (37) disposed on the outer wall of the feed head (4), a connecting rod (36) rotatably connecting the telescopic rod (37) and the sliding arc plate (31), a fixing key (38) fixedly connected to the telescopic rod (37), a fixing rod (39) fixedly connected to the fixing key (38), and a sealing head (391) sliding on the inner wall of the fixing rod (39). The sliding head (32) has a slot on the side near the fixing key (38), and the sealing head (391) contacts the inner wall of the circular groove.

8. The flame-stabilized low-NOx combustion chamber according to claim 7, characterized in that: An elastic element is provided between the sliding arc plate (31) and the feed head (4), an elastic element is provided between the sliding head (32) and the feed head (4), and an elastic element is provided between the sealing head (391) and the fixing rod (39).

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