Low-pressure-loss wide-regulation-ratio multi-rotational-flow discrete array flame burner

Abstract

The invention provides a low-pressure-loss wide-regulation-ratio multi-cyclone discrete array flame burner which comprises a flame tube, a combustion chamber is formed, a first cyclone and second cyclones which are different in size are arranged in the flame tube, the second cyclones are arranged on the two sides of the first cyclone, and the second cyclones are arranged in the combustion chamber. Nozzles communicated with the combustion chamber are arranged on the first swirler and the second swirler; the ventilation device comprises an air cavity, a fan and a plurality of air supply pipes, and the air cavity is connected with the flame tube and communicates with the combustion chamber; the fan is connected to the air cavity and used for guiding air into the combustion chamber through the air cavity. The first ends of the multiple air supply pipes penetrate through the air cavity and communicate with nozzles on the first swirler and the second swirler correspondingly, and the second ends of the multiple air supply pipes communicate with a fuel supply system. The wide regulation ratio of natural gas combustion power is achieved, flame organization and stability under the condition of extremely low air pressure loss are achieved, and combustion emission is effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of burners, and in particular to a multi-swirl discrete array flame burner with low pressure loss and wide adjustment ratio. Background Art

[0002] In the prior art, the design and application of natural gas burners face the problems of high emissions and narrow turndown ratio. Conventional natural gas burners are usually unable to achieve a wide range of turndown ratios, that is, it is difficult to make precise adjustments within a large fuel supply range while maintaining combustion stability. This limits the adaptability and flexibility of the burner under different working conditions. In addition, existing natural gas burners often produce high emissions during the combustion process, which has an adverse impact on the environment.

[0003] In order to solve these problems, the industry has been seeking natural gas burner designs with lower emissions and wider turndown ratios. However, existing burner designs often have difficulty in achieving low emissions while taking into account wide turndown ratios and combustion stability, or they may cause large pressure losses when achieving wide turndown ratios, affecting combustion efficiency and economy. Summary of the invention

[0004] The present invention provides a multi-swirl discrete array flame burner with low pressure loss and wide modulation ratio, which is used to solve the defects of high emission and narrow modulation ratio of natural gas burners in the prior art, and realize wide modulation ratio of natural gas fuel, stable combustion and low emission combustion under extremely low pressure loss conditions.

[0005] The present invention provides a multi-swirl discrete array flame burner with low pressure loss and wide adjustment ratio, comprising: A flame tube is formed with a combustion chamber, wherein a first swirler and a second swirler of different sizes are provided in the flame tube, the second swirler is arranged on both sides of the first swirler, and the first swirler and the second swirler are both provided with nozzles communicating with the combustion chamber; The ventilation device includes an air cavity, a fan and a plurality of air supply pipes, wherein the air cavity is connected to the flame tube, and the air cavity is communicated with the combustion chamber; the fan is connected to the air cavity and is used to introduce air into the combustion chamber through the air cavity; the first ends of the plurality of air supply pipes all pass through the air cavity and are respectively communicated with the nozzles on the first swirler and the second swirler, and the second ends of the plurality of air supply pipes are all communicated with the fuel supply system, so that different air supply pipes can be controlled individually to achieve a wide adjustment ratio.

[0006] According to a multi-swirl discrete array flame burner with low pressure loss and wide adjustment ratio provided by the present invention, the first swirler is arranged at the center of the flame tube, and the second swirler is provided with multiple ones, and the multiple second swirlers are distributed on both sides of the first swirler.

[0007] According to a multi-vortex discrete array flame burner with low pressure loss and wide adjustment ratio provided by the present invention, the first vortex swirler and the second vortex swirler both include: a shell, a rotating shaft and a plurality of blades; a rotating cavity is formed in the shell, the rotating shaft is arranged in the rotating cavity, and the plurality of blades are connected to the rotating shaft at circumferential intervals along the rotating shaft.

[0008] According to a multi-swirl discrete array flame burner with low pressure loss and wide adjustment ratio provided by the present invention, the angle of each blade is 30 degrees to 60 degrees.

[0009] According to a multi-swirl discrete array flame burner with low pressure loss and wide turndown ratio provided by the present invention, the blades of the first swirler and the blades of the second swirler rotate in the same direction; Alternatively, the blades of the first swirler and the blades of the second swirler rotate in opposite directions.

[0010] According to a multi-swirl discrete array flame burner with low pressure loss and wide adjustment ratio provided by the present invention, the flame tube adopts a double-layer partition, the combustion chamber is formed in the double-layer partition, the double-layer partition is provided with square holes, and the combustion chamber is in communication with the air cavity through the square holes.

[0011] According to the present invention, a multi-swirl discrete array flame burner with low pressure loss and wide turndown ratio is provided, wherein a part of the second swirler is arranged on one side of the first swirler, and another part of the second swirler is arranged on the other side of the first swirler; The nozzles in a part of the second swirlers are connected to the fuel supply system through one air supply pipe, the nozzles in another part of the second swirlers are connected to the fuel supply system through another air supply pipe, and the nozzles in the first swirler are connected to the fuel supply system through yet another air supply pipe.

[0012] According to a multi-swirl discrete array flame burner with low pressure loss and wide adjustment ratio provided by the present invention, each nozzle is provided with a chamfer along its circumference, and the chamfer is provided with a plurality of injection holes arranged in an array along its circumference, and each of the injection holes is connected to the corresponding air supply pipe.

[0013] According to a multi-swirl discrete array flame burner with low pressure loss and wide adjustment ratio provided by the present invention, the angle range of the chamfer is 30-60°.

[0014] According to a multi-swirl discrete array flame burner with low pressure loss and wide adjustment ratio provided by the present invention, 6 to 10 injection holes are provided, the diameter of the injection holes is 1 to 2 mm, and the axis position of the injection holes is 1-2 mm below the swirler.

[0015] The present invention provides a multi-swirl discrete array flame burner with low pressure loss and wide adjustment ratio, which is provided with a flame tube and a ventilation device. The flame tube forms a combustion chamber, and the flame tube is provided with a first swirler and a second swirler of different sizes. The second swirler is arranged on both sides of the first swirler, and the first swirler and the second swirler are both provided with nozzles connected to the combustion chamber; the ventilation device includes an air cavity, a fan and a plurality of air supply pipes, the air cavity is connected to the flame tube, and the air cavity is connected to the combustion chamber; the fan is connected to the air cavity, and is used to introduce air into the combustion chamber through the air cavity; the first ends of the plurality of air supply pipes all pass through the air cavity and are respectively connected to the nozzles on the first swirler and the second swirler, and the second ends of the plurality of air supply pipes are all connected to a fuel supply system. Through the combination of the first swirler and the second swirler and the independent control of the air supply pipe, a wide adjustment ratio of the natural gas combustion power is achieved; at the same time, air is provided by the blower, and the air passes through the first swirler and the second swirler of different sizes, and a reasonable recirculation area is generated by using the pressure drop, and natural gas is provided through the air supply pipe, so that the natural gas and the swirling air are mixed and burned to form a discrete columnar swirling flame, thereby achieving flame organization and stability under extremely low air pressure loss conditions, and effectively reducing combustion emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a front view of a multi-swirl discrete array flame burner with low pressure loss and wide adjustment ratio provided by an embodiment of the present invention.

[0018] Figure 2 for Figure 1 Section view along AA.

[0019] Figure 3 yes Figure 2 Schematic diagram along the rotated section line.

[0020] Figure 4 for Figure 1 Cross-sectional view along BB direction.

[0021] Figure 5 It is a structural schematic diagram of a swirler and nozzle combination provided in an embodiment of the present invention.

[0022] Figure 6It is a top view of the swirler and nozzle combination provided by an embodiment of the present invention.

[0023] Figure 7 It is a cross-sectional view of a swirler and nozzle combination provided in an embodiment of the present invention.

[0024] Reference numerals: 1. Flame tube; 2. Double-layer partition; 3. First swirler; 4. Second swirler; 5. Nozzle; 6. Injection hole; 7. Air cavity; 8. Air supply pipe; 9. Fan; 10. Square hole. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Combine the following Figure 1-Figure 7 The invention provides a multi-swirl discrete array flame burner with low pressure loss and wide adjustment ratio, wherein the pressure loss is generally less than 100Pa.

[0027] This embodiment provides a multi-swirl discrete array flame burner with low pressure loss and wide turndown ratio, such as Figures 1 to 4 As shown, it includes a flame tube 1 and a ventilation device. The flame tube 1 forms a combustion chamber, and a first swirler 3 and a second swirler 4 of different sizes are provided in the flame tube 1, and the second swirler 4 is arranged on both sides of the first swirler 3, and the first swirler 3 and the second swirler 4 are provided with nozzles 5 connected to the combustion chamber; the ventilation device includes an air cavity 7, a fan 9 and a plurality of air supply pipes 8, the air cavity 7 is connected to the flame tube 1, and the air cavity 7 is connected to the combustion chamber; the fan 9 is connected to the air cavity 7, and is used to introduce air into the combustion chamber through the air cavity 7; the first ends of the plurality of air supply pipes 8 all pass through the air cavity 7, and are respectively connected to the nozzles 5 on the first swirler 3 and the second swirler 4, and the second ends of the plurality of air supply pipes 8 are all connected to the fuel supply system, so that different air supply pipes 8 can be controlled separately to achieve a wide adjustment ratio.

[0028] Specifically, the flame tube 1, as the main structure of the combustion chamber, has two first swirlers 3 and second swirlers 4 of different sizes built in. The second swirlers 4 are arranged on both sides of the first swirler 3. Such a layout helps to form a more complex combustion flow field. Each swirler is equipped with a nozzle 5 directly connected to the combustion chamber. These nozzles 5 are the channels for the fuel and air to enter the combustion chamber after mixing. The ventilation device is responsible for providing the necessary air to the combustion chamber and controlling the supply of fuel. The device includes an air cavity 7, a fan 9 and a plurality of air supply pipes 8. The air cavity 7 is connected to the flame tube 1 to ensure that the air can enter the combustion chamber smoothly. The fan 9 introduces air into the combustion chamber through the air cavity 7 to provide the necessary oxygen for the combustion process. The first ends of the plurality of air supply pipes 8 pass through the air cavity 7 and are respectively connected to the nozzles 5 on the first swirler 3 and the second swirler 4, while the second ends are connected to the fuel supply system. Such a design enables each swirler to receive fuel independently, thereby realizing the hierarchical control of the burner.

[0029] In this embodiment, the burner is precisely controlled by providing different air supply pipes 8 for the first swirler 3 and the second swirler 4. This hierarchical control method can adjust the combustion power according to actual needs, reduce the minimum combustion power, and ensure the maximum combustion power, thereby significantly improving the regulation ratio.

[0030] By adjusting the multiple combinations of cyclones, this embodiment can generate effective swirls with extremely low pressure loss, thereby forming an effective recirculation zone. This not only ensures the stable fire conditions for natural gas diffusion combustion, but also optimizes the mixing effect of natural gas and air, thereby improving combustion efficiency.

[0031] Compared with the traditional single-strand flame, the flame generated in this embodiment is a discrete circumferential array of split flames. This flame form makes the heat distribution more uniform, avoids the overlap of high-temperature areas, and thus reduces the generation of NOx (nitrogen oxides). This not only helps to reduce environmental pollution during the combustion process, but also improves the environmental performance of the burner.

[0032] In some embodiments, Figure 2-3 As shown, there is one first swirler 3 , and there are multiple second swirlers 4 . The first swirler 3 is arranged at the center of the flame tube 1 , and the multiple second swirlers 4 are distributed on both sides of the first swirler 3 .

[0033] In this embodiment, around the central first swirler 3, a plurality of second swirlers 4 are arranged in a uniform array along the circumferential direction. This layout not only ensures the reasonable distribution of the recirculation zone in the combustion chamber, but also greatly promotes the full mixing of natural gas and air. Each second swirler 4 is connected to the air cavity 7, thereby ensuring that air can be evenly supplied to each combustion point.

[0034] With this setup, the burner's operating stability has been significantly improved. Due to the reasonable distribution of the recirculation zone and the full mixing of natural gas and air, the combustion process has become more stable and uniform. This not only helps to reduce temperature fluctuations in the combustion chamber and reduce the accumulation of high-temperature areas, thereby effectively inhibiting the generation of NOx, but also makes the overall performance of the burner even better.

[0035] In addition, this uniform flame distribution also brings lower pollutant emissions, further reducing the negative impact on the environment. Therefore, this low pressure loss, wide turndown ratio multi-swirl discrete array flame burner not only improves combustion efficiency, but also achieves a more environmentally friendly combustion process.

[0036] like Figure 5 , Figure 6 and Figure 7 As shown, the first cyclone 3 and the second cyclone 4 both include: a housing, a rotating shaft and a plurality of blades. A rotating cavity is formed in the housing, the rotating shaft is arranged in the rotating cavity, and the plurality of blades are connected to the rotating shaft at intervals along the circumference of the rotating shaft.

[0037] The shell is the main supporting structure of the cyclone, and a rotating cavity is formed inside it. This rotating cavity provides the necessary space for the shaft and blades, allowing them to rotate freely therein, thus producing a swirling effect.

[0038] The rotating shaft is arranged in the rotating cavity and serves as a supporting structure for the blades. A plurality of blades are connected to the rotating shaft at intervals along the circumference of the rotating shaft. The angles and numbers of these blades are carefully designed to ensure the best swirl effect.

[0039] Preferably, the angle of each blade is set between 30 and 60 degrees. This angle range has been verified by a large number of experiments and can ensure that the blades generate sufficient centrifugal force when rotating, thereby forming an effective swirl. At the same time, this angle can also ensure the strength and durability of the blades, so that the cyclone can maintain stable performance during long-term use.

[0040] By adjusting the blade angle and number, the first swirler 3 and the second swirler 4 can both generate a strong swirling effect. The swirling helps to better mix the fuel and the air, thereby improving the combustion efficiency.

[0041] In some embodiments, Figures 3 to 7 As shown, the blades of the first cyclone 3 rotate in the same direction as the blades of the second cyclone 4. Alternatively, the blades of the first cyclone 3 rotate in opposite directions to the blades of the second cyclone 4. In addition, the rotation direction of each second cyclone 4 can be adjusted as needed to ensure the mixing effect.

[0042] In this embodiment, when the blades of the first swirler 3 and the blades of the second swirler 4 work in the same rotation direction, they can form a strong swirling field together. This configuration helps to mix the fuel and air more effectively, thereby improving the stability and efficiency of the combustion process. At the same time, the same rotation direction can also reduce turbulence and eddy currents in the combustion chamber, reduce energy losses, and make the overall performance of the burner more outstanding.

[0043] On the other hand, when the blades of the first swirler 3 and the blades of the second swirler 4 work in opposite rotation directions, a shearing effect will be generated between them. This shearing effect can further promote the mixing of fuel and air, making the combustion process more complete and uniform. In addition, the opposite rotation directions also help to form a more complex flow field structure in the combustion chamber, thereby enhancing the stability and controllability of combustion.

[0044] In addition to the above two fixed rotation direction configurations, some embodiments also allow the rotation direction of each second swirler 4 to be adjusted according to actual needs. This adjustability enables the burner to adapt to different working conditions and fuel types, ensuring the best mixing effect and combustion efficiency. By accurately controlling the rotation direction of each second swirler 4, the flow field structure in the combustion chamber can be further optimized, reducing energy loss and pollutant emissions.

[0045] In some embodiments, Figures 1 to 4 As shown, the flame tube 1 adopts a double-layer partition 2, a combustion chamber is formed in the double-layer partition 2, and a square hole 10 is provided on the double-layer partition 2, and the combustion chamber is in communication with the air cavity 7 through the square hole 10.

[0046] In this embodiment, a closed combustion chamber is formed inside the double-layer interlayer 2 structure of the flame tube 1. This combustion chamber is the main place where fuel and air mix and combustion reaction occurs. The design of the double-layer interlayer 2 not only provides the necessary thermal insulation protection for the combustion chamber, but also makes the combustion process more stable and controllable.

[0047] A plurality of square holes 10 are provided on the double-layer partition 2. These square holes 10 not only connect the combustion chamber with the air cavity 7, but also allow the air to circulate and mix more fully in the combustion chamber. By adjusting the size, number and position of the square holes 10, the air flow rate and flow velocity entering the combustion chamber can be precisely controlled, thereby optimizing the combustion process.

[0048] Some of the square holes 10 are located near the first swirler 3 and the second swirler 4. The design of these holes helps to introduce the swirling air generated by the swirler into the combustion chamber, further promoting the mixing of fuel and air. Other square holes 10 are distributed in a circular array inside the double-layer partition 2, and together with the double-layer partition 2 form a hollow air film cooling structure. This structure can form a thin air film during the combustion process, effectively isolating the high temperature of the combustion chamber from the double-layer partition 2, greatly reducing the temperature of the double-layer partition 2, and ensuring the heat dissipation effect and service life of the flame tube 1.

[0049] In some embodiments, the air film cooling structure of the air chamber is composed of an annular array of square holes 10 and a double-layer insulation layer. The annular array of square holes 1010 is 1~2mm long and 10~15mm wide, and is located in the annular groove of the double-layer insulation layer 2. After the air flows from the air cavity 7 into the double-layer insulation layer 2, a cooling air film is formed, which cools the inner high-temperature insulation layer, reduces the wall temperature, and thus reduces combustion emissions.

[0050] The supply amount of swirl gas can be adjusted to meet different combustion requirements by increasing or decreasing the number of second swirlers 4, thereby improving the flexibility and adaptability of the burner.

[0051] In some embodiments, Figures 1 to 4 As shown, a part of the second swirlers 4 is arranged on one side of the first swirler 3, and another part of the second swirlers 4 is arranged on the other side of the first swirler 3; the nozzles 5 in a part of the second swirlers 4 are connected to the fuel supply system through an air supply pipe 8, the nozzles 5 in another part of the second swirlers 4 are connected to the fuel supply system through another air supply pipe 8, and the nozzles 5 in the first swirler 3 are connected to the fuel supply system through yet another air supply pipe 8, so that the different air supply pipes 8 can be controlled separately to achieve a wide adjustment ratio.

[0052] In this embodiment, the multi-swirl discrete array flame burner with low pressure loss and wide adjustment ratio is provided with a first swirler 3 and a plurality of second swirlers 4.

[0053] The second swirlers 4 are divided into two parts, one part is arranged on one side of the first swirler 3, and the other part is arranged on the other side of the first swirler 3. This layout may help to evenly distribute and fully mix the fuel in the combustion chamber. Each swirler (including the first swirler and the second swirler 4) is equipped with a nozzle 5, which is used to spray the fuel into the combustion chamber.

[0054] The nozzle 5 is connected to the fuel supply system via an air supply pipe 8. In particular, different parts of the second swirler 4 and the first swirler 3 are each connected to the fuel supply system via an independent air supply pipe 8. By providing a separate air supply pipe 8 for each swirler or swirler group, the system can achieve accurate control of the fuel. Since each air supply pipe 8 can be controlled individually, the fuel supply amount of each swirler or swirler group can be adjusted as needed. This flexibility enables the system to operate within a wide range of fuel adjustment ratios, thereby adapting to different combustion requirements.

[0055] The multi-swirl discrete array flame burner with a wide modulation ratio and low pressure loss provided in this embodiment can operate safely under ultra-low pressure drops of air pressure drop not higher than 80Pa and natural gas pressure drop not higher than 700Pa, and can achieve low emissions of natural gas fuel through the diffusion flame combustion technology of multiple combined swirls and discrete arrays, solving the problem of difficulty in stabilizing fire under extremely low pressure loss conditions.

[0056] In some embodiments, Figures 1 to 7 As shown, each nozzle 5 is provided with a chamfer along its circumference, and a plurality of injection holes 6 arranged in an array along its circumference are provided on the chamfer, and each injection hole 6 is connected to a corresponding air supply pipe 8 .

[0057] For example, the first end of the nozzle 55 is provided with 7 injection holes 6, and the circumferential array is vertically arranged at the center of the 45° chamfered surface. The diameter of the injection hole 66 is between 1 and 2 mm. The installation position and the injection angle can be set in multiple ways. For example, the injection angle can be set to 30 to 60°, and the installation position can be the large end, small end and center of the chamfered surface.

[0058] With such a setting, the injection effect of the divided natural gas can be changed by adjusting the injection angle and the installation position, avoiding the mixing effect affected by the jet root being directly impacted by the swirling air, ensuring that the jet and the swirling air are more fully mixed, making the combustion more complete and the combustion efficiency higher.

[0059] Furthermore, the injection angle and installation position settings affect the flame distribution effect of a single flame in a discrete array. The larger the injection angle and the lower the installation position, the lower the flame height and the wider the flame, thereby affecting the temperature distribution in the combustion area, thereby achieving the purpose of ensuring flame stability and reducing combustion emissions.

[0060] It should be noted that the number of injection holes 6 should not be too many, and should be 6 to 10. Too many injection holes 6 will lead to interference when a single flame burns, which will lead to overlapping of high-temperature zones, higher combustion emissions, and the presence of multiple jets will lead to lower jet speeds and unstable flames. Correspondingly, the number of injection holes should not be too few, as too few will lead to higher injection speeds and longer flame lengths. In the case of low-velocity swirling air, the high-velocity jet mixing effect is poor and it is easy to flame out. The axial distance between the injection hole 6 and the second swirler 4 should not be too large, as too large a distance will lead to poor mixing of a single natural gas jet with low-pressure loss swirling air, affecting combustion emissions.

[0061] Reference Figure 5 , Figure 6 The axial distances between the first cyclone 3, the second cyclone 4 and the injection hole 6 are between 1 and 2 mm, the number of cyclone blades should be between 6 and 10, the outer diameter of the cyclone is between 30 mm and 60 mm, and the inner diameter is between 12 mm and 24 mm. If the cyclone is the first cyclone 3, a larger interval is selected, and the cyclone swirl angle is 30 to 60°.

[0062] Such a setting can provide effective swirl air under extremely low pressure loss conditions, ensure the recirculation zone effect, and then ensure that the natural gas jet and the low-pressure loss swirl air are evenly mixed. The number of blades and the inner and outer diameters should be within a reasonable range. The purpose is to ensure that the effective area is reasonable and the swirl effect meets the requirements.

[0063] In summary, the present application realizes cooling of the combustion area and reduces combustion emissions through a double-layer insulation layer, square holes 10 inside the insulation layer, and square holes 10 around the swirler; the present invention realizes a wide adjustment ratio of natural gas combustion power through a multi-combination arrangement of the first swirler 3 and the second swirler 4 and separate control of the air supply pipe 8; air is provided by the blower 9. Due to the limitation of the blower 9 device, the air pressure loss and flow rate are extremely low, and it is very difficult to mix with natural gas. The air passes through the large and small combined swirlers to effectively utilize the pressure drop to produce a reasonable reflow zone, and natural gas is provided through the air supply pipe 8. The circumferential array of discrete injection holes 6 on the natural gas nozzle 5 is split into strands after being emitted, and the split natural gas is mixed with the swirling air and then burned to form a discrete columnar swirling flame, thereby realizing flame organization and stability under extremely low air pressure loss conditions, effectively reducing combustion emissions.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-swirl discrete array flame burner with low pressure loss and wide turndown ratio, characterized in that: include: A flame tube (1) is formed with a combustion chamber, wherein a first swirler (3) and a second swirler (4) having different sizes are provided in the flame tube (1), the second swirler (4) being arranged on both sides of the first swirler (3), and the first swirler (3) and the second swirler (4) are both provided with a nozzle (5) communicating with the combustion chamber; The ventilation device comprises an air cavity (7), a fan (9) and a plurality of air supply pipes (8), wherein the air cavity (7) is connected to the flame tube (1), and the air cavity (7) is communicated with the combustion chamber; the fan (9) is connected to the air cavity (7) and is used to introduce air into the combustion chamber through the air cavity (7); The first ends of the plurality of air supply pipes (8) all pass through the air cavity (7) and are respectively connected to the nozzles (5) on the first swirler (3) and the second swirler (4); the second ends of the plurality of air supply pipes (8) are all connected to the fuel supply system, so that different air supply pipes (8) can be controlled individually to achieve a wide adjustment ratio.

2. The multi-swirl discrete array flame burner with low pressure loss and wide turndown ratio according to claim 1 is characterized in that: The first swirler (3) is arranged at the center of the flame tube (1), and a plurality of the second swirlers (4) are provided, and the plurality of the second swirlers (4) are distributed on both sides of the first swirler (3).

3. The multi-swirl discrete array flame burner with low pressure loss and wide turndown ratio according to claim 2 is characterized in that: The first cyclone (3) and the second cyclone (4) both comprise: a shell, a rotating shaft and a plurality of blades; a rotating chamber is formed in the shell, the rotating shaft is arranged in the rotating chamber, and the plurality of blades are connected to the rotating shaft at intervals along the circumference of the rotating shaft.

4. The multi-swirl discrete array flame burner with low pressure loss and wide turndown ratio according to claim 3 is characterized in that: The angle of each blade is 30 degrees to 60 degrees.

5. The multi-swirl discrete array flame burner with low pressure loss and wide turndown ratio according to claim 3 is characterized in that: The blades of the first swirler (3) and the blades of the second swirler (4) rotate in the same direction; Alternatively, the blades of the first swirler (3) and the blades of the second swirler (4) rotate in opposite directions.

6. The multi-swirl discrete array flame burner with low pressure loss and wide turndown ratio according to claim 1 is characterized in that: The flame tube (1) adopts a double-layer partition (2), the combustion chamber is formed in the double-layer partition (2), a square hole (10) is provided on the double-layer partition (2), and the combustion chamber is in communication with the air cavity (7) through the square hole (10).

7. The multi-swirl discrete array flame burner with low pressure loss and wide turndown ratio according to claim 2 is characterized in that: A portion of the second cyclone (4) is arranged on one side of the first cyclone (3), and another portion of the second cyclone (4) is arranged on the other side of the first cyclone (3); The nozzles (5) in a portion of the second swirlers (4) are connected to the fuel supply system via one air supply pipe (8), the nozzles (5) in another portion of the second swirlers (4) are connected to the fuel supply system via another air supply pipe (8), and the nozzles (5) in the first swirler (3) are connected to the fuel supply system via yet another air supply pipe (8).

8. The multi-swirl discrete array flame burner with low pressure loss and wide turndown ratio according to claim 1 is characterized in that: Each of the nozzles (5) is provided with a chamfer along its circumference, and the chamfer is provided with a plurality of injection holes (6) arranged in an array along its circumference, and each of the injection holes (6) is connected to a corresponding air supply pipe (8).

9. The multi-swirl discrete array flame burner with low pressure loss and wide turndown ratio according to claim 8, characterized in that: The chamfer angle ranges from 30° to 60°.

10. The multi-swirl discrete array flame burner with low pressure loss and wide turndown ratio according to claim 8, characterized in that: The number of the injection holes (6) is 6 to 10, the diameter of the injection holes (6) is 1 to 2 mm, and the axis of the injection holes (6) is located 1 to 2 mm below the cyclone.

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