Incandescent light burner

Abstract

The utility model relates to the technical field of combustors, in particular to an incandescent light combustor which comprises a contraction section, and the diameter of an inlet of the contraction section is larger than that of an outlet of the contraction section. An outlet of the contraction section is communicated with an inlet of the mixing chamber; the diameter of an inlet of the diffusion section is smaller than that of an outlet of the diffusion section, and the inlet of the diffusion section is communicated with the outlet of the mixing chamber; the air pipe section is communicated with the mixing chamber; and the windproof cover is communicated with the outlet of the diffusion section. According to the incandescent light combustor, the Venturi effect is ingeniously applied, the combustion efficiency, the combustion stability and the flame intensity of the combustor are improved, fuel gas consumption is reduced under the same combustion effect, the production cost is reduced, and therefore the functions of effectively resisting wind and rain, reducing the consumption of combustion gas, facilitating successful ignition at a time and achieving continuous and stable combustion are achieved.

Description

Technical Field

[0001] This utility model relates to the field of burner technology, and in particular to a continuous lamp burner. Background Technology

[0002] The flare is the "lifeline" for safe production in high-sulfur gas fields. During production, the flare is kept burning continuously. In case of emergency, the high-pressure acid gas in the process can be quickly depressurized and burned from the top of the flare through the venting pipeline. This can effectively reduce the emission of harmful gases such as hydrogen sulfide, prevent hydrogen sulfide poisoning and environmental pollution, and is an important guarantee for the personal safety of surrounding residents.

[0003] A gas field in Sichuan Province is located in a mountainous area with high levels of toxic and harmful gases such as hydrogen sulfide. Spanning a large area east-west and north-south, and affected by complex terrain, altitude, and severe weather, the existing flare burners (mostly tubular combustion tubes) used in the production sites have weak weather resistance, high energy consumption, are prone to abnormal extinction, and are difficult to re-ignite after extinction, seriously affecting production safety. Currently, in occasional heavy rain and wind, combustion is maintained by increasing the fuel gas intake pressure and flow rate, but this increases fuel consumption, raises operating costs, and leads to exceeding energy-saving targets, without fundamentally improving combustion stability. Therefore, there is an urgent need for a weather-resistant, low-energy-consumption flare burner. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing flare system continuous lamp burners, such as weak wind and rain resistance, high energy consumption, and easy extinguishing, and to provide a continuous lamp burner.

[0005] In a first aspect, the present invention provides a continuous lamp burner, including a converging section, wherein the inlet diameter of the converging section is larger than the outlet diameter of the converging section;

[0006] The mixing chamber has its outlet connected to the inlet of the contraction section.

[0007] A diffusion section, wherein the inlet diameter of the diffusion section is smaller than the outlet diameter of the diffusion section, and the inlet of the diffusion section is connected to the outlet of the mixing chamber;

[0008] A duct section, which is connected to the mixing chamber;

[0009] A windproof cover, which is connected to the outlet of the diffuser section.

[0010] The continuous lamp burner provided by this utility model ingeniously applies the Venturi effect. The fuel gas enters the mixing chamber through the contraction section. When the gas flows through the contraction area, the flow velocity increases, creating a low-pressure zone, which in turn forms a vacuum inside the mixer, producing a strong adsorption effect. At the same time, a large amount of air can be drawn into the mixing chamber through the duct section. After being fully mixed with the high-speed flowing fuel gas, it is ejected at high speed through the diffusion section to the windproof cover and undergoes violent combustion. This improves the combustion efficiency, combustion stability, and flame intensity of the burner. Under the same combustion effect, it reduces fuel gas consumption and lowers production costs. Thus, it achieves the functions of effectively resisting wind and rain, reducing the amount of combustion gas used, facilitating successful ignition on the first attempt, and ensuring continuous and stable combustion.

[0011] Preferably, the outlet of the contraction section is connected to the inlet of the mixing chamber through a nozzle, and the nozzle has a main nozzle combustion hole and a plurality of auxiliary nozzle combustion holes surrounding the main nozzle combustion hole.

[0012] This structural design, with the main nozzle combustion orifice and several auxiliary nozzle combustion orifices surrounding it forming a multi-layered combustion orifice, ensures a more uniform distribution of fuel gas upon entering the mixing chamber, further improving fuel gas utilization. Provided the fuel gas is completely combusted, the amount of fuel gas used can be reduced, thereby lowering overall energy consumption. Furthermore, the multi-layered combustion orifice design ensures that the fuel gas flow covers the entire mixing chamber area, creating a uniform and continuous airflow scouring effect. This scouring effect helps prevent the accumulation of pollutants or impurities in the mixing chamber, maintaining internal cleanliness, ensuring the combustion process is not blocked or hindered, and improving the burner's weather resistance and combustion stability.

[0013] Preferably, the main nozzle combustion hole is located at the center of the nozzle, and the auxiliary nozzle combustion hole surrounds the main nozzle combustion hole at least twice.

[0014] With this structural arrangement, the main nozzle combustion orifice is located at the center of the nozzle, forming a stable and intense core flame that plays a crucial role in ignition and maintaining flame stability. At least two concentric rings of auxiliary nozzle combustion orifices distribute the fuel gas over a larger area, creating a multi-layered gas flow. This facilitates thorough mixing of fuel gas and air, enhancing overall combustion efficiency. The multi-ring design also ensures uniform fuel gas distribution within the mixing chamber, allowing it to fully participate in the combustion process and significantly improving fuel gas utilization. While achieving the desired combustion effect, it reduces fuel gas consumption, thereby lowering energy consumption and operating costs. This multi-ring structure of auxiliary nozzle combustion orifices surrounding the main combustion orifice creates a comprehensive airflow scouring effect, preventing the deposition of pollutants or impurities in the mixing chamber. This helps maintain cleanliness and fluidity within the mixing chamber, ensuring smooth combustion. The uniformly distributed gas injection not only makes the flame more stable but also enhances the burner's resistance to external disturbances under adverse weather conditions (such as strong winds and rain), effectively preventing the flame from being blown out and ensuring the flare system's continuous and stable operation in the special environment of high-sulfur gas fields.

[0015] Preferably, a first dustproof net is installed at the inlet of the duct section, and the aperture of the first dustproof net is 1mm to 2.5mm.

[0016] With this structural design, the first dust filter can intercept larger dust particles, impurities, and other suspended matter, preventing them from entering the duct section and thus avoiding contamination of the mixing chamber. This ensures thorough mixing of fuel gas and air, maintaining the efficient operation of the combustion system.

[0017] Preferably, a second dustproof net is provided inside the windproof cover, and the aperture of the second dustproof net is 1mm~2.5mm.

[0018] With this structural design, the second dustproof net can effectively block pollutants such as dust, carbon deposits, nitrogen oxides, and insects from entering the windproof cover, reducing the risk of local blockage of the burner or unstable flame caused by dust or impurities, thereby enhancing the anti-interference capability of the entire combustion system under adverse weather conditions.

[0019] Preferably, an energy storage metal mesh is also provided inside the wind shield near the outlet end of the diffuser section, and the aperture of the energy storage metal mesh is 4mm~6mm.

[0020] This structural design places the energy storage metal mesh near the diffuser outlet. The mesh has a larger aperture than the second dust filter, and its primary function is to store the heat generated during combustion. Through heat transfer, it transfers the stored heat to the vicinity of the diffuser outlet, maintaining the ignition temperature in that area. This ensures the burner has sufficient thermal energy to support ignition, and even if temperature fluctuations occur during ignition, it can quickly replenish heat, making the ignition process smoother, reducing the risk of ignition failure due to insufficient temperature, and achieving successful ignition on the first attempt.

[0021] Preferably, the second dustproof net has circular mesh openings, and the energy storage metal net has rectangular or rhomboid mesh openings.

[0022] With this structural design, the second dust filter uses circular mesh openings that are evenly distributed to provide a stable filtration effect, effectively intercepting dust and particles while ensuring sufficient airflow, reducing airflow resistance, and ensuring the smooth entry of combustion air required for combustion, thus maintaining a clean internal environment for the burner. The energy storage metal mesh uses rectangular or diamond-shaped mesh openings, which have a larger effective conduction area in terms of heat transfer, helping to quickly accumulate and release the heat energy generated by combustion. This design allows the area near the diffuser outlet to maintain a relatively high temperature, which is conducive to achieving successful ignition on the first attempt and stabilizing the combustion process.

[0023] Preferably, the diameter ratio of the inlet to the outlet of the contraction section is 2.5:1 to 2:1.

[0024] This structural design, with an inlet-to-outlet diameter ratio of 2.5:1 to 2:1 for the contraction section, effectively accelerates the fuel gas as it flows through the contraction section, creating a strong low-pressure zone (vacuum effect). This negative pressure helps to rapidly draw in a large amount of air from the duct section, achieving thorough mixing of fuel gas and air, thereby improving combustion efficiency. The larger inlet diameter ensures sufficient flow of fuel gas upon entry, while the smaller outlet diameter increases the gas velocity, which is beneficial for forming a uniform and stable mixture in the mixing chamber, ensuring a uniform and stable flame during combustion.

[0025] Preferably, the diameter ratio of the outlet to the inlet of the diffusion section is 2.5:1 to 2:1.

[0026] With this structural design, the diffuser section has a smaller inlet diameter and a larger outlet diameter, causing the mixed gas to gradually slow down and diffuse evenly as it passes through the diffuser section. This results in a more uniform distribution of the fuel-air mixture, improving combustion completeness, reducing incomplete combustion, and increasing combustion efficiency.

[0027] Preferably, the windproof cover has several air guide holes.

[0028] With this structural design, the air guide holes can guide external air into the windproof cover, providing sufficient oxygen for combustion of the fuel gas, making combustion more complete, improving combustion efficiency, making the flame more stable, avoiding the extinction phenomenon caused by airflow turbulence or sudden wind speed changes, improving the burner's resistance to wind and rain, and ensuring stable operation even in severe weather.

[0029] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0030] 1. This utility model provides a continuous lamp burner that cleverly applies the Venturi effect. Fuel gas enters the mixing chamber through the contraction section. When the gas flows through the contraction area, the flow velocity increases, creating a low-pressure zone. This forms a vacuum inside the mixer, resulting in a strong adsorption effect. At the same time, a large amount of air can be drawn into the mixing chamber through the duct section. After being fully mixed with the high-speed flowing fuel gas, the air is ejected at high speed through the diffuser section to the windproof cover and undergoes intense combustion. This improves the combustion efficiency, combustion stability, and flame intensity of the burner. Under the same combustion effect, it reduces fuel gas consumption and lowers production costs. Thus, it achieves the functions of effectively resisting wind and rain, reducing fuel gas consumption, facilitating successful ignition on the first attempt, and ensuring continuous and stable combustion. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a continuous lamp burner;

[0032] Figure 2 This is a schematic diagram of the nozzle structure.

[0033] Marked in the image:

[0034] 1-Contraction section, 2-Mixing chamber, 3-Diffusion section, 4-Dust duct section, 41-First dustproof net, 5-Windproof cover, 51-Second dustproof net, 52-Energy storage metal mesh, 53-Air guide hole, 6-Nozzle, 61-Main nozzle combustion hole, 62-Auxiliary nozzle combustion hole. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0036] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0037] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0038] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0039] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0040] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0041] Example 1

[0042] This embodiment provides a continuous lamp burner, such as... Figure 1 As shown, it includes a contraction section 1, the inlet diameter of which is larger than the outlet diameter of the contraction section 1, and a contraction section inlet flange can be installed at the inlet of the contraction section 1.

[0043] The outlet of the contraction section 1 is connected to the inlet of the mixing chamber 2. Specifically, the length of the mixing chamber 2 can be 0.7m, and the pipe diameter of the mixing chamber 2 can be DN40.

[0044] Diffusion section 3 has an inlet diameter smaller than its outlet diameter, and its inlet is connected to the outlet of mixing chamber 2.

[0045] Duct section 4 is connected to mixing chamber 2. Specifically, duct section 4 can be installed at the top of mixing chamber 2.

[0046] The wind shield 5 is connected to the outlet of the diffuser section 3. In this embodiment, the diameter of the wind shield 5 can be DN80.

[0047] Furthermore, such as Figure 1 As shown, in this embodiment, the side wall of the windproof cover 5 can be provided with several air guide holes 53. The air guide holes 53 can guide the outside air into the interior of the windproof cover 5, provide sufficient oxygen for the fuel gas to burn more completely, improve combustion efficiency, make the flame more stable, avoid the phenomenon of extinction caused by airflow turbulence or sudden wind speed, improve the burner's resistance to wind and rain, and ensure that it can still work stably under bad weather.

[0048] Furthermore, such as Figure 1 As shown, in this embodiment, a first dustproof net 41 can be installed at the inlet of the duct section 4. Specifically, the mesh of the first dustproof net 41 can be uniformly distributed in the form of round holes, and the mesh diameter of the first dustproof net 41 can be 1mm to 2.5mm, preferably 2mm. The first dustproof net 41 can intercept larger particles of dust, impurities, and other suspended matter, preventing them from entering the duct section 4, thereby avoiding contamination of the mixing chamber 2, ensuring sufficient mixing of fuel gas and air, and maintaining the efficient operation of the combustion system.

[0049] Furthermore, such as Figure 1As shown, in this embodiment, a second dustproof net 51 is provided inside the wind shield 5. Specifically, the second dustproof net 51 can be installed at the end of the wind shield 5 away from the diffuser section 3. The mesh of the second dustproof net 51 can be uniformly distributed in the form of round holes, and the hole diameter of the second dustproof net 51 can be 1mm~2.5mm, preferably 2mm. The second dustproof net 51 can effectively block pollutants such as dust, carbon deposits, nitrogen oxides, and insects from entering the interior of the wind shield 5, reducing the risk of partial blockage of the burner or flame instability caused by dust or impurities, thereby enhancing the anti-interference capability of the entire combustion system under adverse weather conditions.

[0050] Furthermore, such as Figure 1 As shown, in this embodiment, an energy-storing metal mesh 52 can also be installed inside the wind shield 5. The energy-storing metal mesh 52 is located inside the wind shield 5 near the outlet end of the diffuser section 3. Specifically, the mesh openings of the energy-storing metal mesh 52 can be uniformly distributed in a rectangular or rhomboid shape. The aperture of the energy-storing metal mesh 52 is 4mm to 6mm, preferably 5mm. The energy-storing metal mesh 52 is located near the outlet end of the diffuser section 3. The aperture of the energy-storing metal mesh 52 is larger than that of the second dustproof mesh 51. Its main function is to accumulate the heat energy generated during combustion. Through the heat transfer effect, it can transfer the stored heat to the vicinity of the outlet of the diffuser section 3, thereby maintaining the ignition temperature in this area and ensuring that the burner has sufficient heat energy support during ignition. Even if there are temperature fluctuations during ignition, heat can be quickly replenished, making the ignition process smoother, reducing the risk of ignition failure due to insufficient temperature, and achieving successful ignition on the first attempt.

[0051] The second dust filter 51 uses circular mesh holes, which are evenly distributed to provide a stable filtration effect, effectively intercepting dust and particles, while ensuring sufficient airflow, reducing airflow resistance, ensuring the smooth entry of combustion air required for combustion, and maintaining a clean internal environment of the burner; the energy storage metal mesh 52 uses rectangular or diamond-shaped mesh holes, which has a larger effective conduction area in terms of heat transfer, helping to quickly accumulate and release the heat energy generated by combustion. This design can keep the temperature near the outlet of the diffuser section 3 continuously high, which is conducive to achieving successful ignition on the first attempt and stabilizing the combustion process.

[0052] Furthermore, such as Figure 1 As shown, in this embodiment, the diameter ratio of the inlet to the outlet of the contraction section 1 is 2.5:1 to 2:1; the diameter ratio of the outlet to the inlet of the diffuser section 3 is also 2.5:1 to 2:1. Specifically, the length of the contraction section 1 can be 0.5m, the inlet diameter of the contraction section 1 can be DN40, the outlet diameter of the contraction section 1 can be DN15, the length of the diffuser section 3 can be 0.5m, the inlet diameter of the diffuser section 3 can be DN15, and the outlet diameter of the diffuser section 3 can be DN40.

[0053] The diffuser section 3 has a smaller inlet diameter and a larger outlet diameter, causing the mixed gas to gradually slow down and diffuse evenly as it passes through it. This results in a more uniform distribution of the fuel gas and air mixture, improving combustion completeness, reducing incomplete combustion, and increasing combustion efficiency. The air guide vent 53 guides external air into the wind shield 5, providing sufficient oxygen for combustion, resulting in more complete combustion, improved combustion efficiency, and a more stable flame. This prevents flameout caused by turbulent airflow or sudden wind speed changes, enhances the burner's resistance to wind and rain, and ensures stable operation even in adverse weather conditions.

[0054] like Figure 1 As shown, the perpetual lamp burner provided in this embodiment cleverly utilizes the Venturi effect (also known as the Venturi effect). Figure 1 The black arrows represent fuel gas, and the hollow arrows represent air. The fuel gas enters the mixing chamber 2 through the contraction section 1. As the gas flows through the contraction zone, its velocity increases, creating a low-pressure area. This forms a vacuum inside the mixer, resulting in a strong adsorption effect. Simultaneously, a large amount of air is drawn into the mixing chamber 2 through the duct section 4, where it is thoroughly mixed with the high-speed flowing fuel gas. The mixture is then ejected at high speed through the diffuser section 3 to the windshield 5, where it undergoes intense combustion. This improves the burner's combustion efficiency, combustion stability, and flame intensity, reducing fuel gas consumption and production costs while maintaining the same combustion effect. This achieves effective resistance to wind and rain, reduced fuel gas consumption, easy one-time ignition success, and continuous stable combustion.

[0055] Example 2

[0056] Based on Example 1, such as Figure 1 , Figure 2 As shown, in this embodiment, the outlet of the contraction section 1 is connected to the inlet of the mixing chamber 2 via a nozzle 6. The nozzle 6 has a main nozzle combustion hole 61 and several auxiliary nozzle combustion holes 62 surrounding the main nozzle combustion hole 61. This structural arrangement, with the main nozzle combustion hole 61 and the surrounding auxiliary nozzle combustion holes 62 forming a multi-layered combustion hole design, allows for a more uniform distribution of fuel gas upon entering the mixing chamber 2, further improving fuel gas utilization. Under the premise of complete fuel gas combustion, the amount of fuel gas used can be reduced, thereby lowering overall energy consumption; furthermore, the multi-layered combustion hole design ensures that the fuel gas flow can cover the entire area of ​​the mixing chamber 2, forming a uniform and continuous airflow scouring effect. This scouring effect helps prevent the accumulation of pollutants or impurities in the air within the mixing chamber 2, maintaining internal cleanliness, ensuring that the combustion process is not blocked or hindered, and improving the burner's resistance to weathering and its combustion stability.

[0057] Furthermore, such as Figure 2 As shown, the main nozzle combustion orifice 61 is located at the center of the nozzle 6, and the auxiliary nozzle combustion orifice 62 surrounds the main nozzle combustion orifice 61 at least twice. Figure 2 For example, Figure 2 The main nozzle combustion orifice 61 is located at the center of the nozzle 6, and the first ring around the main nozzle combustion orifice 61 ( Figure 2 Four auxiliary nozzle combustion holes 62 are arranged in the first ring (dashed line outside the main nozzle combustion hole 61), and the distance between adjacent auxiliary nozzle combustion holes 62 in the first ring can be the same; the second ring (dashed line around the main nozzle combustion hole 61) Figure 2 Twelve auxiliary nozzle combustion holes 62 are set on the second ring (dotted line) outward from the main nozzle combustion hole 61, and the distance between adjacent auxiliary nozzle combustion holes 62 on the second ring can be the same.

[0058] The main nozzle combustion orifice 61, located at the center of the nozzle 6, forms a stable and intense core flame, playing a crucial role in ignition and maintaining flame stability. At least two concentric rings of auxiliary nozzle combustion orifices 62 distribute the fuel gas over a larger area, creating a multi-layered gas flow. This facilitates thorough mixing of the fuel gas and air, enhancing overall combustion efficiency. The multi-ring design also ensures uniform distribution of the fuel gas within the mixing chamber 2, allowing it to fully participate in the combustion process and significantly improving fuel gas utilization. While achieving the desired combustion effect, it reduces fuel gas consumption, thereby lowering energy consumption and operating costs. This multi-ring structure of auxiliary nozzle combustion orifices 62 surrounding the main combustion orifice creates a comprehensive airflow scouring effect, preventing the deposition of pollutants or impurities in the air within the mixing chamber 2. This helps maintain cleanliness and fluidity within the mixing chamber 2, ensuring smooth combustion. The uniformly distributed gas injection not only makes the flame more stable but also enhances the burner's resistance to external disturbances under adverse weather conditions (such as strong winds and rain), effectively preventing the flame from being blown out and ensuring the flare system's continuous and stable operation in the special environment of high-sulfur gas fields.

[0059] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A burner for a permanent light, characterized in that Includes a contraction section (1), wherein the inlet diameter of the contraction section (1) is larger than the outlet diameter of the contraction section (1); The outlet of the contraction section (1) is connected to the inlet of the mixing chamber (2); The diffusion section (3) has an inlet diameter smaller than the outlet diameter of the diffusion section (3), and the inlet of the diffusion section (3) is connected to the outlet of the mixing chamber (2); Duct section (4), which is connected to the mixing chamber (2); The wind shield (5) is connected to the outlet of the diffuser section (3).

2. A burner as claimed in claim 1, characterised in that The outlet of the contraction section (1) is connected to the inlet of the mixing chamber (2) through the nozzle (6). The nozzle (6) has a main nozzle combustion hole (61) and a number of auxiliary nozzle combustion holes (62) surrounding the main nozzle combustion hole (61).

3. A burner as claimed in claim 2, wherein The main nozzle combustion hole (61) is located at the center of the nozzle (6), and the auxiliary nozzle combustion hole (62) surrounds the main nozzle combustion hole (61) at least twice.

4. A burner as claimed in claim 1, wherein A first dustproof net (41) is installed at the entrance of the duct section (4), and the aperture of the first dustproof net (41) is 1mm~2.5mm.

5. A burner as claimed in claim 1, wherein The windproof cover (5) is provided with a second dustproof net (51), and the aperture of the second dustproof net (51) is 1mm~2.5mm.

6. A burner as claimed in claim 5, wherein An energy storage metal mesh (52) is also provided inside the wind shield (5) near the outlet end of the diffuser section (3), and the aperture of the energy storage metal mesh (52) is 4mm~6mm.

7. A burner as claimed in claim 6, wherein The second dustproof net (51) has circular mesh openings, while the energy storage metal net (52) has rectangular or rhomboid mesh openings.

8. A burner as claimed in claim 1, wherein The diameter ratio of the inlet to the outlet of the contraction section (1) is 2.5:1 to 2:

1.

9. A burner as claimed in claim 8, wherein The diameter ratio of the outlet to the inlet of the diffusion section (3) is 2.5:1 to 2:

1.

10. A burner as claimed in claim 1, wherein The windproof cover (5) has several air guide holes (53).

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