Efficient combustor and low-load stable combustion boiler

Abstract

The invention provides an efficient combustor and a low-load stable combustion boiler, and relates to the field of thermal power generation, the efficient combustor comprises a mounting cylinder, a connecting disc is fixedly arranged at the rear end of the interior of the mounting cylinder, a flow equalizing assembly is arranged in the mounting cylinder, a rotational flow assembly is arranged at the front end of the flow equalizing assembly, and a flow stabilizing assembly is arranged at the front end of the rotational flow assembly; a connecting assembly is arranged at the rear end of the connecting disc, a conveying assembly is arranged in the connecting assembly, an air supply assembly is arranged behind the connecting assembly, and a combustion-supporting assembly is arranged above the connecting assembly. By means of the flow equalizing assembly, resistance is reduced at high air pressure through the flow equalizing assembly, and energy consumption of the draught fan is reduced; the flow speed is increased at low wind pressure, so that airflow distribution and flow speed are uniform, flame drift caused by non-uniform flow speed at low load is avoided, airflow is ensured to enter a combustion area at the most ideal flow speed, and the combustion stability is improved.

Description

Technical Field

[0001] This invention relates to the field of thermal power generation, and more specifically, to a high-efficiency burner and a low-load stable combustion boiler. Background Technology

[0002] To meet the grid's demand for renewable energy consumption, thermal power units need to have peak-shaving capabilities reaching 20%-30% of rated load. Currently, achieving stable combustion at low loads mainly relies on burner modifications, such as enhancing flue gas recirculation or optimizing pulverized coal concentration. However, these existing technologies have a fundamental flaw: traditional burners use a fixed structure and cannot adaptively adjust across the entire operating range. This leads to a sharp drop in primary air-coal flow rate at low loads, causing flame instability and making it impossible to break through lower stable combustion load limits without auxiliary fuel. This restricts the unit's peak-shaving capacity and operational economy.

[0003] For example, the utility model patent (application number: 202222027087.4) discloses "An Eccentric Burner Head and Burner," whose specification states that the eccentric burner head includes a fixing plate for fixing to a boiler, an ignition gun, and a combustion cylinder. The fixing plate has a slotted hole for bolts to pass through. The ignition gun is installed on the outside of the combustion cylinder. The axis of the combustion cylinder is offset from the axis of the fixing plate. The farthest point of the outer peripheral wall of the combustion cylinder from the axis of the fixing plate is point A, and the farthest point of the ignition gun from the axis of the combustion cylinder is point B. The distance from the axis of the fixing plate to point A is equal to the distance from the axis of the fixing plate to point B. This application improves the compatibility of the burner with the boiler installation port by eccentrically setting the combustion cylinder relative to the fixing plate; the aforementioned patent can corroborate the deficiencies of the prior art.

[0004] Therefore, we have made improvements to this and proposed a high-efficiency burner and a low-load stable combustion boiler. Summary of the Invention

[0005] The purpose of this invention is to solve the problem that current burners, which use a fixed structure, cannot adaptively adjust within the entire operating range.

[0006] To achieve the above-mentioned objectives, the present invention provides the following high-efficiency burner and low-load stable combustion boiler to improve the above-mentioned problems.

[0007] The application is as follows: A high-efficiency burner includes an installation cylinder, a connecting plate fixedly disposed at the rear end of the installation cylinder, a flow equalization component disposed inside the installation cylinder, a swirl component disposed at the front end of the flow equalization component, a flow stabilization component disposed at the front end of the swirl component, a connecting component disposed at the rear end of the connecting plate, a conveying component disposed inside the connecting component, an air supply component disposed behind the connecting component, a combustion aid component disposed above the connecting component, an ignition component disposed below the connecting component, and an installation component disposed outside the connecting component and the air supply component.

[0008] As a preferred technical solution of this application, the flow equalization component includes a plurality of guide springs, which are equidistantly and inclinedly fixed to the inner wall of the mounting cylinder.

[0009] As a preferred technical solution of this application, the root of the guide spring near the inner wall of the mounting cylinder is thinner than other parts of the guide spring.

[0010] As a preferred technical solution of this application, the rear end of the guide spring is provided with a blocking block that is fixedly connected to the mounting cylinder, and the rear end of the blocking block is provided with an inclined surface.

[0011] As a preferred technical solution of this application, the current stabilizing component includes a blocking ring, which is fixed to the front of the mounting cylinder. A partition cylinder is fixedly provided inside the blocking ring, and a plurality of inlet holes are equidistantly opened on the partition cylinder. Guide plates are provided on both sides outside the inlet holes, and the guide plates are fixed inside the partition cylinder.

[0012] As a preferred technical solution of this application, the swirl assembly includes a mounting plate located inside the separator cylinder. Several inclined second swirl vanes are fixedly arranged at equal intervals on the circumferential side of the mounting plate. The second swirl vanes are fixedly connected to the interior of the separator cylinder. Several inclined first swirl vanes are fixedly arranged at equal intervals at the front end of the mounting plate. A first through hole is provided on the mounting plate behind the first swirl vane.

[0013] As a preferred technical solution of this application, the connecting component includes a connecting pipe, an input pipe is fixedly provided at the top end of the connecting pipe, the input pipe communicates with the interior of the connecting pipe, and an mounting plate is fixedly provided at the rear end of the connecting pipe.

[0014] As a preferred technical solution of this application, the conveying assembly includes a rotating shaft located inside the connecting pipe, and a spiral plate is fixedly provided on the circumferential side of the rotating shaft.

[0015] A low-load stable combustion boiler includes a furnace body, and several sets of burner groups arranged vertically are provided on the outside of the furnace body. The burner groups include four high-efficiency burners respectively located at the four corners of the furnace body.

[0016] As a preferred technical solution of this application, the extension lines of the air outlets of the two high-efficiency burners located on the diagonal of the furnace body are tangent to circle C1, and the extension lines of the air outlets of the other two high-efficiency burners are tangent to circle C2.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: In the scheme of this application: 1. By setting up a flow equalization component, the resistance is reduced and the fan energy consumption is reduced at high wind pressure; at low wind pressure, the flow velocity is increased, so that the airflow distribution and flow velocity are uniform, avoiding flame drift caused by uneven flow velocity at low load, ensuring that the airflow enters the combustion zone at the most ideal flow velocity, improving the stability of combustion, and solving the problem that the burner in the existing technology adopts a fixed structure and cannot adaptively adjust within the full range of operating conditions; 2. By setting up a blocking block, the high-speed incoming high-temperature pulverized coal airflow is guided to the center inside the installation cylinder, which improves the service life of the guide spring and solves the problem of direct impact and wear of the airflow on the moving root of the guide spring in the prior art; 3. By setting up a swirl component, the airflow is initially swirled, improving combustion efficiency and solving the problem of low combustion efficiency in the prior art; 4. By setting up a flow stabilizing component, the airflow entering the flow stabilizing component through the swirling component is able to undergo a secondary enhancement of the swirling effect, making the swirling more stable and solving the problem of poor swirling effect in the existing technology, which leads to an insignificant improvement in combustion effect. Attached Figure Description

[0018] Figure 1 A schematic diagram of the high-efficiency burner provided in this application; Figure 2 A schematic diagram of the air supply assembly in the high-efficiency burner provided in this application; Figure 3 A schematic diagram showing the disassembled structure of the delivery component in the high-efficiency burner provided in this application; Figure 4 A schematic diagram showing the disassembled structure of the flow stabilization component and the swirl component in the high-efficiency burner provided in this application; Figure 5 A schematic diagram showing the disassembled structure of the flow equalization component in the high-efficiency burner provided in this application; Figure 6 This is a structural schematic diagram of the low-load stable combustion boiler provided in this application; Figure 7 This is a top view structural diagram of the low-load stable combustion boiler provided in this application.

[0019] The image shows: 1. Mounting cylinder; 2. Flow stabilizing assembly; 21. Baffle ring; 22. Divider cylinder; 23. Inlet hole; 24. Guide plate; 3. Swirl assembly; 31. Mounting plate; 32. Swirl plate No. 1; 33. Swirl plate No. 2; 4. Flow equalization assembly; 41. Guide spring; 42. Baffle block; 5. Mounting assembly; 51. Mounting shell; 52. Mounting cover; 53. Mounting bracket; 6. Connecting assembly; 61. Connecting pipe; 62. Input pipe; 63. Mounting plate; 7. Conveying assembly; 71. Rotating shaft; 72. Spiral plate; 73. Conveying motor; 8. Air supply assembly; 81. Fan; 82. Mounting pipe; 83. Protective net; 84. Fixing pipe; 9. Combustion aid assembly; 91. Atomizing nozzle; 92. Conveying pipe; 10. Connecting plate; 11. Ignition assembly; 12. Furnace body. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0022] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] Example 1 Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 A high-efficiency burner includes an installation cylinder 1. A connecting plate 10 is fixedly provided at the rear end inside the installation cylinder 1. The connecting plate 10 is used for protection, separating the high-temperature environment inside the installation cylinder 1 from the inside of the installation assembly 5. The installation cylinder 1 is provided with a flow equalization component 4. The flow equalization component 4 is used to automatically reduce the air outlet when the wind pressure is low and automatically increase the air outlet when the wind pressure increases, so as to make the airflow distribution and flow velocity uniform, avoid flame flickering caused by uneven flow velocity at low load, and ensure that the airflow enters the combustion zone at the most ideal flow velocity. The front end of the flow equalization component 4 is provided with a swirl component 3, which is used to perform preliminary swirl on the airflow to enhance combustion efficiency. The front end of the swirl component 3 is provided with a flow stabilization component 2, which is used to divert part of the airflow and re-integrate it into the main airflow to further enhance the swirl effect and achieve high-efficiency combustion after being ejected from the installation cylinder 1. The rear end of the connecting plate 10 is provided with a connecting component 6, which is used to input coal powder into the conveying component 7. The connecting component 6 is provided with the conveying component 7 inside, which is used to quickly send the coal powder into the installation cylinder 1. The air supply component 8 is provided behind the connecting component 6, which is used to supply combustion air and provide sufficient flow rate. The combustion support component 9 is provided above the connecting component 6, which is used to inject combustion support oil when necessary. The ignition component 11 is provided below the connecting component 6, which is used to ignite the coal powder. The installation component 5 is provided outside the connecting component 6 and the air supply component 8. The ignition assembly 11 includes an ignition component 11 fixed to the rear end of the connecting plate 10. The ignition assembly 11 is specifically an ignition gun. The output end of the ignition gun extends through the connecting plate 10 into the interior of the mounting cylinder 1. During initial ignition, the ignition assembly 11 sprays out a high-temperature flame to ignite the coal powder inside the mounting cylinder 1. At the same time, the coal powder mixed airflow is introduced into the furnace body 12 through the air supply assembly 8 to form a stable, rotating fireball. At this time, the ignition assembly 11 stops spraying flame, and the coal powder continuously input through the conveying assembly 7 will be continuously ignited and fully combusted inside the furnace body 12.

[0025] Furthermore, such as Figure 1 , Figure 4 and Figure 5 As shown, the flow equalization component 4 includes several guide springs 41. The guide springs 41 are made of, but are not limited to, nickel-based high-temperature superalloys. This material can work for a long time at a temperature of 600-700°C and maintain excellent creep resistance and fatigue resistance. When in use, the temperature inside the mounting cylinder 1 can reach 300-500°C, which is fully suitable for this application scenario. Several guide springs 41 are equidistantly inclined and fixed to the inner wall of the mounting cylinder 1. Several guide springs 41 form a cone shape through the inclination angle. The airflow passes through the gap between several guide springs 41 and is discharged. When the wind pressure is low, the conical structure composed of several guide springs 41 is in a closed state under its own elasticity. At this time, the flow area is the smallest, which can maintain sufficient outlet wind speed, prevent coal powder from settling, and ensure flame stability. When the wind pressure exceeds the pre-tightening force of the guide springs 41, the thrust will force all the guide springs 41 to overcome the elasticity and flip backward, so that the equivalent flow area of ​​the entire cone increases, thereby reducing flow resistance and accommodating a larger air-coal flow rate, thus realizing automatic adjustment of the outlet size. The rear end of the guide spring 41 is provided with a blocking block 42 that is fixedly connected to the mounting cylinder 1. The blocking block 42 protects the thin root of the guide spring 41 and prevents the airflow from directly impacting and abrading the movable root of the guide spring 41, thereby improving the durability of the guide spring 41. The rear end of the blocking block 42 is provided with a slope, which guides the coal dust and airflow to the center of the mounting cylinder 1. The increased air pressure makes the flow rate faster, and the slope can also reduce the direct impact of the airflow and coal dust on the blocking block 42.

[0026] Furthermore, such as Figure 5 As shown, the root of the guide spring 41 near the inner wall of the mounting cylinder 1 is thinner than other parts of the guide spring 41, and the guide spring 41 can bend backward through the thinner root when subjected to high wind pressure.

[0027] Furthermore, such as Figure 1 and Figure 4 As shown, the flow stabilizing component 2 includes a baffle ring 21, which is fixed to the front of the installation cylinder 1. A partition cylinder 22 is fixedly installed inside the baffle ring 21, forming an annular cavity between the partition cylinder 22 and the installation cylinder 1. Several inlet holes 23 are equidistantly opened on the partition cylinder 22. The airflow entering the cavity between the partition cylinder 22 and the installation cylinder 1 merges with the airflow inside the partition cylinder 22 through the inlet holes 23. Guide plates 24 are provided on both sides of the outside of the inlet holes 23. The guide plates 24 swirl the airflow and coal powder inside the partition cylinder 22 and those merging into the partition cylinder 22 through the inlet holes 23. The guide plates 24 are fixed inside the partition cylinder 22. When the airflow merges through the inlet holes 23, it will generate severe shearing and disturbance to the main airflow inside the partition cylinder 22, thereby enhancing combustion efficiency and swirling effect.

[0028] Furthermore, such as Figure 1 and Figure 4 As shown, the swirl assembly 3 includes a mounting disk 31 located inside the separator cylinder 22. Several inclined second swirl vanes 33 are fixedly and equidistantly on the circumferential side of the mounting disk 31. The airflow passing through the flow equalization assembly 4 undergoes initial swirl through the first swirl vane 32 and the second swirl vane 33. The second swirl vane 33 is fixedly connected to the interior of the separator cylinder 22. Several inclined first swirl vanes 32 are fixedly and equidistantly on the front end of the mounting disk 31. A first through hole is provided on the mounting disk 31 behind the first swirl vane 32. Several sets of circular arrays of second through holes are provided on the first swirl vane 32. The positions of the several sets of second through holes are staggered from those of the first swirl vane 32.

[0029] Furthermore, such as Figure 1 , Figure 2 and Figure 3As shown, the connecting assembly 6 includes a connecting pipe 61, which is fixed to the rear end of the connecting plate 10. The front end of the connecting pipe 61 extends through the connecting plate 10 into the interior of the mounting cylinder 1. An input pipe 62 is fixedly provided at the top end of the connecting pipe 61. Coal powder is conveyed to the interior of the mounting cylinder 1 through the input pipe 62 for connection with the equipment for conveying coal powder. The input pipe 62 communicates with the interior of the connecting pipe 61. An mounting plate 63 is fixedly provided at the rear end of the connecting pipe 61. The connecting pipe 61 and the mounting plate 63 are used to connect with the conveying assembly 7. The conveying assembly 7 includes a rotating shaft 71. When the rotating shaft 71 rotates, it guides pulverized coal into the installation cylinder 1 through the spiral structure of the spiral plate 72. The rotating shaft 71 is located inside the connecting pipe 61. The spiral plate 72 is fixedly installed on the circumferential side of the rotating shaft 71. The rear end of the installation plate 63 is fixedly installed with a conveying motor 73. The output end of the conveying motor 73 passes through the installation plate 63 and is fixedly connected to the rotating shaft 71. When the conveying motor 73 starts, it drives the rotating shaft 71 to rotate.

[0030] Furthermore, such as Figure 1 and Figure 2 As shown, the air supply assembly 8 includes a fan 81. An installation pipe 82 is fixedly provided at the input end of the fan 81. A protective net 83 is fixedly provided inside the installation pipe 82. A fixing pipe 84 is fixedly provided at the output end of the installation pipe 82. The output end of the fixing pipe 84 extends through the connecting plate 10 into the interior of the installation cylinder 1. The fixing pipe 84 is fixedly connected to the connecting plate 10.

[0031] Furthermore, such as Figure 1 , Figure 6 and Figure 7 As shown, the mounting assembly 5 includes a mounting shell 51, which is fixed to the rear end of the mounting cylinder 1. The rear end of the mounting cylinder 1 extends through the mounting shell 51 into the interior of the mounting shell 51. A mounting cover 52 is fixedly provided at the rear end of the mounting shell 51. The interior of the mounting cover 52 communicates with the interior of the mounting shell 51. A mounting bracket 53 is fixed between the rotating shaft 71 and the mounting cover 52. The fan 81 is installed inside the mounting cover 52. The end of the mounting tube 82 extends through the mounting cover 52 into the exterior of the mounting cover 52.

[0032] Furthermore, such as Figure 1 , Figure 2 and Figure 3As shown, the combustion-supporting component 9 includes an atomizing nozzle 91, which is fixed to the front end of the connecting plate 10. The rear end of the atomizing nozzle 91 is fixed with a delivery pipe 92. The interior of the atomizing nozzle 91 is connected to the interior of the delivery pipe 92. The end of the delivery pipe 92 passes through the connecting plate 10 and the mounting shell 51 and extends to the outside of the mounting shell 51. The delivery pipe 92 is used to connect to a container for storing oil and pump oil to the atomizing nozzle 91, thereby atomizing the oil through the atomizing nozzle 91 and spraying it into the mounting cylinder 1 for combustion support. The combustion-supporting component 9 is only used when starting from a cold state, when the coal quality is poor, and when the combustion conditions are unstable. Cold start: If there is no heat accumulation inside the furnace body 12, the initial high temperature environment must be provided by the fuel flame to heat the entire high-efficiency burner and the furnace body 12, creating the basic conditions for stable ignition of pulverized coal. Unstable combustion: For example, when operating at extremely low load or with a low coal powder injection rate, the combustion state is prone to instability. At this time, the combustion aid component 9 can be used to assist the combustion of the flame that is about to be extinguished and forcibly pull it back to a stable state.

[0033] Example 2 The high-efficiency burner provided in Example 1 is further optimized, specifically, as follows: Figure 6 and Figure 7 As shown, a low-load stable combustion boiler includes a furnace body 12. Several sets of burner groups are arranged vertically on the outside of the furnace body 12. Each burner group includes four high-efficiency burners respectively located at the four corners of the furnace body 12. The mounting shell 51 and mounting cylinder 1 in the high-efficiency burners are fixedly connected to the furnace body 12. The end of the mounting cylinder 1 in the high-efficiency burner extends through the furnace body 12 and into the interior of the furnace body 12.

[0034] Furthermore, such as Figure 6 and Figure 7 As shown, the extended lines of the air outlets of two high-efficiency burners located on the diagonal of the furnace body 12 are tangent to circle C1, and the extended lines of the air outlets of the other two high-efficiency burners are tangent to circle C2. When in use, the burner group is started, and the four rotating flame jets ejected from the corners together support a stable rotating fireball in the center of the furnace, which can ensure that the pulverized coal is fully and efficiently burned in the furnace body 12.

[0035] The usage process of the high-efficiency burner and low-load stable combustion boiler provided by this invention is as follows: When using the furnace body 12, pulverized coal is transported to the inside of the connecting pipe 61 through the input pipe 62. The conveying motor 73 is started to rotate the rotating shaft 71 and the spiral plate 72 and send the pulverized coal into the installation cylinder 1. The blower 81 is started to send sufficient air volume into the installation cylinder 1 through the fixed pipe 84. At the same time, the ignition assembly 11 is started to ignite the pulverized coal in the installation cylinder 1. The air supplied by the blower 81 flows to the outlet of the installation cylinder 1 and first passes through several guide springs 41. When the wind pressure is low, the conical structure composed of several guide springs 41 is in a close-closed state under its own elasticity. At this time, the flow area is small, which can maintain sufficient outlet wind speed, prevent coal powder from settling, and ensure flame stability. When the wind pressure exceeds the pre-tightening force of the guide springs 41, the thrust will force all the guide springs 41 to overcome the elasticity and flip backward, so that the equivalent flow area of ​​the entire cone increases. Subsequently, most of the airflow enters the partition cylinder 22 and undergoes initial swirling through the second swirling vane 33 and the first swirling vane 32. It then swirls again through the tilting of the guide vane 24. At the same time, a small portion of the airflow enters the mounting cylinder 1 and the partition cylinder 22, enters the baffle ring 21 through the inlet hole 23, and is then pushed into the main airflow inside the baffle ring 21 by the tilting of the guide vane 24, enhancing the swirling effect of the airflow. It is then sprayed into the furnace body 12. The four rotating flame jets ejected from the corners together support a stable rotating fireball in the center of the furnace, ensuring that the pulverized coal is fully and efficiently combusted in the furnace body 12.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] Obviously, the embodiments described above are merely some embodiments of the present invention, not all embodiments. The accompanying drawings show preferred embodiments of the present invention, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms; rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this invention.

Claims

1. A high-efficiency burner, characterized in that, The device includes an installation cylinder (1), a connecting plate (10) fixedly provided at the rear end of the installation cylinder (1), a flow equalization component (4) provided inside the installation cylinder (1), a swirl component (3) provided at the front end of the flow equalization component (4), a flow stabilization component (2) provided at the front end of the swirl component (3), a connecting component (6) provided at the rear end of the connecting plate (10), a conveying component (7) provided inside the connecting component (6), an air supply component (8) provided behind the connecting component (6), a combustion-supporting component (9) provided above the connecting component (6), an ignition component (11) provided below the connecting component (6), and an installation component (5) provided outside the connecting component (6) and the air supply component (8).

2. The high-efficiency burner according to claim 1, characterized in that, The flow equalization component (4) includes a plurality of guide springs (41), which are equidistantly and obliquely fixed to the inner wall of the mounting cylinder (1).

3. The high-efficiency burner according to claim 2, characterized in that, The root of the guide spring (41) near the inner wall of the mounting cylinder (1) is thinner than other parts of the guide spring (41).

4. A high-efficiency burner according to claim 2 or 3, characterized in that, The rear end of the guide spring (41) is provided with a blocking block (42) that is fixedly connected to the mounting cylinder (1), and the rear end of the blocking block (42) is provided with an inclined surface.

5. A high-efficiency burner according to claim 2, characterized in that, The current stabilizing component (2) includes a blocking ring (21), which is fixed to the front of the inside of the mounting cylinder (1). A partition cylinder (22) is fixed inside the blocking ring (21). A plurality of inlet holes (23) are equidistantly opened on the partition cylinder (22). Guide plates (24) are provided on both sides outside the inlet holes (23). The guide plates (24) are fixed inside the partition cylinder (22).

6. A high-efficiency burner according to claim 5, characterized in that, The swirl assembly (3) includes a mounting plate (31) located inside the separator cylinder (22). Several inclined second swirl vanes (33) are fixedly arranged at equal intervals on the circumference side of the mounting plate (31). The second swirl vanes (33) are fixedly connected to the interior of the separator cylinder (22). Several inclined first swirl vanes (32) are fixedly arranged at equal intervals at the front end of the mounting plate (31). A first through hole is provided on the mounting plate (31) behind the first swirl vanes (32).

7. A high-efficiency burner according to claim 1 or 6, characterized in that, The connecting component (6) includes a connecting pipe (61), an input pipe (62) is fixedly provided at the top end of the connecting pipe (61), the input pipe (62) communicates with the interior of the connecting pipe (61), and an mounting plate (63) is fixedly provided at the rear end of the connecting pipe (61).

8. A high-efficiency burner according to claim 7, characterized in that, The conveying assembly (7) includes a rotating shaft (71) located inside the connecting pipe (61), and a spiral plate (72) is fixedly provided on the circumferential side of the rotating shaft (71).

9. A low-load stable combustion boiler, using the high-efficiency burner as described in claim 8, characterized in that, The furnace body (12) includes a furnace body (12) with several sets of burner groups arranged vertically on the outside of the furnace body (12). Each burner group includes four high-efficiency burners located at the four corners of the furnace body (12).

10. A low-load stable combustion boiler according to claim 9, characterized in that, Two of the high-efficiency burner outlets located on the diagonal of the furnace body (12) have their extended lines tangent to circle C1, while the other two high-efficiency burner outlets have their extended lines tangent to circle C2.

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