Low nitrogen burner and flue heating device

Abstract

The present invention belongs to the technical field of burners, and discloses a low-nitrogen burner and a flue heating device. The low-nitrogen burner includes a joint, a nozzle, and a flame stabilizing plate. The joint is connected to the fuel source and can be fixed in the flue; the nozzle is connected and arranged on the joint, and the nozzle can spray flames into the flue; the flame stabilizing plate includes a base plate and two bent plates arranged at both ends of the base plate, the base plate is installed on the joint, and the bent plates include a first folding plate, a second folding plate, and a third folding plate connected in sequence. The first folding plate is installed on the base plate, and the third folding plate extends toward the jetting direction of the nozzle. Ventilation holes are provided on the first folding plate and / or the second folding plate. The low-nitrogen burner can stably spray flames and burn in the flue, will not be affected by the air flow rate in the flue, works continuously and stably, and has an outstanding effect in suppressing the generation of nitrogen oxides.

Description

Technical Field

[0001] The present invention relates to the technical field of burners, and in particular to a low-nitrogen burner and a flue heating device. Background Art

[0002] Burners are important equipment on industrial oil-fired boilers and gas-fired boilers. They can ensure stable ignition and complete combustion of the fuel, and can also inhibit the generation of nitrogen oxides.

[0003] Existing burners used for flue heating are complex and bulky. Installing these burners in the flue is not only difficult for operators, but also complicated to control and maintain after installation. Furthermore, these burners often suffer from unstable flames and abnormal temperatures in the local burner structure due to excessive flue air velocity and large deviations in air intake regulation. This can affect the safe operation of the device and the burner's performance.

[0004] With increasingly stringent environmental protection requirements, higher standards are being set for nitrogen oxide emissions, requiring burners to operate continuously and stably within the flue. Therefore, there is an urgent need to improve existing technologies to enable flue burners to burn stably even under abnormal wind speeds and reduce nitrogen oxide emissions. Summary of the Invention

[0005] The purpose of the present invention is to provide a low-nitrogen burner that can stably spray flames and burn in a flue, is not affected by the air flow rate in the flue, works continuously and stably, and has an outstanding effect in inhibiting the generation of nitrogen oxides.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] The low-nitrogen burner includes a joint, a nozzle and a flame-stabilizing plate. The joint is connected to the fuel source and can be fixed in the flue; the nozzle is connected to the joint and can spray flame into the flue; the flame-stabilizing plate includes a base plate and two bent plates relatively arranged at both ends of the base plate, the base plate is installed on the joint, the bent plates include a first folding plate, a second folding plate and a third folding plate connected in sequence, the first folding plate is installed on the base plate, the third folding plate is extended toward the jetting direction of the nozzle, and air holes are provided on the first folding plate and / or the second folding plate.

[0008] Optionally, the angle between the first folding plate and the jet direction is α, 45°≤α≤75°; the angle between the second folding plate and the jet direction is β, 105°≤β≤135°; the angle between the third folding plate and the jet direction is γ, -10°≤γ≤10°.

[0009] Optionally, at least one row of the ventilation holes is provided on the first folding plate and the second folding plate, and each row of the ventilation holes includes a plurality of the ventilation holes evenly spaced apart.

[0010] Optionally, a mounting hole is provided on the substrate, a sleeve is inserted into the mounting hole, and the nozzle is inserted into the sleeve.

[0011] Optionally, the substrate and the two bent plates are integrally formed.

[0012] Another object of the present invention is to provide a flue heating device, which includes a plurality of low-nitrogen burners as described in any of the above schemes.

[0013] Optionally, it also includes a fuel main pipe connected to the above-mentioned fuel source, and a plurality of fuel sub-pipes are connected to the above-mentioned fuel main pipe. The above-mentioned fuel sub-pipes are perpendicular to the outer wall of the above-mentioned flue and extend into the above-mentioned flue, and a plurality of the above-mentioned low-nitrogen burners are installed on the above-mentioned fuel sub-pipes.

[0014] Optionally, the multiple low-nitrogen burners on each of the above-mentioned fuel sub-pipes are arranged side by side, and the flame-stabilizing plates of the multiple low-nitrogen burners on each of the above-mentioned fuel sub-pipes are connected in sequence.

[0015] Optionally, at least one of the low-nitrogen burners on each of the fuel sub-pipes is connected to one of the low-nitrogen burners on the adjacent fuel sub-pipe.

[0016] Optionally, the low-nitrogen burner on the end of each fuel sub-pipe is connected to the low-nitrogen burner on the end of the adjacent fuel sub-pipe, and the bending plates of the two connected low-nitrogen burners are connected to each other, and flame-blocking plates are provided on both sides of the bending plates.

[0017] Beneficial effects:

[0018] The low-nitrogen burner in the present invention sprays flame into the flue through a nozzle installed on the joint, thereby heating the flue, and the joint is connected to the fuel source to provide fuel to the nozzle; the flame-stabilizing plate is covered on the outer periphery of the nozzle by a first folding plate, a second folding plate and a third folding plate connected in sequence, and the third folding plate is extended toward the jet direction of the above-mentioned nozzle, which can prevent the high-speed airflow in the flue from affecting the flame in the flame-stabilizing plate, thereby playing a role in stabilizing the flame; at the same time, air holes are provided on the above-mentioned first folding plate and / or the above-mentioned second folding plate, and the air holes can provide air in the flue to the flame ejected from the nozzle, playing a role in assisting the combustion of the flame, so that the nozzle can continuously and stably spray flame and heat the flue gas in the flue, ensuring that the operation of the nozzle will not be affected by the air flow rate in the flue, and has an outstanding effect in inhibiting the generation of nitrogen oxides. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an axonometric view of a low nitrogen burner provided by a specific embodiment of the present invention;

[0020] Figure 2 is a cross-sectional view of a flame stabilizing plate provided in a specific embodiment of the present invention;

[0021] Figure 3 Schematic diagram of a flue heating device provided by a specific embodiment of the present invention installed on a flue;

[0022] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle.

[0023] In the picture:

[0024] 10. Low-nitrogen burner; 11. Flame baffle; 20. Fuel main pipe; 21. Fuel sub-pipe; 101. Flue;

[0025] 100, joint; 200, nozzle; 310, substrate; 311, sleeve; 320, bending plate; 321, first folding plate; 322, second folding plate; 323, third folding plate; 330, vent. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0027] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0028] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0029] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0030] The low-nitrogen burner 10 in this embodiment is used to be placed in the flue 101. The flame ejected by the low-nitrogen burner 10 heats the flue gas in the flue 101, so that when the hot flue gas flows into the downstream boiler, it can be fully burned with the fuel in the boiler, thereby reducing the generation of nitrogen oxides in the boiler.

[0031] Please refer to Figure 1In this embodiment, the low-nitrogen burner 10 includes a joint 100, a nozzle 200 and a flame-stabilizing plate. The joint 100 is connected to the fuel source and can be fixed in the flue 101; the nozzle 200 is connected to the joint 100 and can spray flame into the flue 101; the flame-stabilizing plate includes a base plate 310 and two bent plates 320 relatively arranged at both ends of the base plate 310, the base plate 310 is installed on the joint 100, and the bent plate 320 includes a first folding plate 321, a second folding plate 322 and a third folding plate 323 connected in sequence, the first folding plate 321 is installed on the base plate 310, and the third folding plate 323 is extended toward the jetting direction of the nozzle 200, and a vent 330 is provided on the first folding plate 321 and / or the second folding plate 322.

[0032] The low nitrogen burner 10 in this embodiment sprays flame into the flue 101 through the nozzle 200 installed on the joint 100, thereby heating the flue 101. The joint 100 is connected to the fuel source to provide fuel to the nozzle 200. The flame stabilizing plate is covered on the periphery of the nozzle 200 by the first folding plate 321, the second folding plate 322 and the third folding plate 323 connected in sequence. The third folding plate 323 extends toward the jet direction of the nozzle 200, which can prevent the high-speed airflow in the flue 101 from affecting the flame in the flame stabilizing plate. flame, thereby stabilizing the flame; at the same time, an air vent 330 is provided on the first folding plate 321 and / or the second folding plate 322, and the air vent 330 can provide air in the flue 101 to the flame ejected from the nozzle 200, playing the role of assisting the combustion of the flame, so that the nozzle 200 can continuously and stably eject the flame and heat the flue gas in the flue 101, ensuring that the operation of the nozzle 200 will not be affected by the change of the air flow rate in the flue 101, and has an outstanding effect of inhibiting the generation of nitrogen oxides.

[0033] In this embodiment, the fuel source provides natural gas as fuel, and the flue 101 provides air as a combustion aid. The design of the flame stabilizing plate allows the nozzle 200 to maintain a stable flame, resulting in better combustion, even under conditions of abnormal wind speed fluctuations in the flue 101, such as excessive wind speed or large deviations in air intake regulation. This flame stabilizing plate utilizes flue gas recirculation technology, allowing combustion air to enter the combustion area through the vents 330 on the flame stabilizing plate. Negative pressure is then used to draw the flue gas within the flue 101 back into the nozzle 200's flame combustion area, lowering the peak temperature of the flame in the combustion area and thereby reducing nitrogen oxide emissions.

[0034] Optionally, at least one row of the vent holes 330 is formed on each of the first folded plate 321 and the second folded plate 322, and each row of the vent holes 330 includes a plurality of evenly spaced vent holes 330. In this embodiment, two rows of vent holes 330 are formed on the first folded plate 321, and one row of vent holes 330 is formed on the second folded plate 322. The arrangement of multiple rows of vent holes 330 enables the flame stabilizing plate to provide sufficient and stable air to the nozzle 200, thereby facilitating flame combustion and making the nozzle 200's flame more stable. Those skilled in the art can design the number and arrangement of the vent holes 330 using computational fluid dynamics methods, so that the flame shape and heat flux distribution of the nozzle 200 during flame emission meet the requirements of heating the flue 101.

[0035] Please continue to refer to Figure 2 In the embodiment, the angle between the first folding plate 321 and the jet direction is α, and the jet direction is Figure 2 In the horizontal direction shown in , 45°≤α≤75°; the angle between the second folding plate 322 and the jet direction is β, 105°≤β≤135°; the angle between the third folding plate 323 and the jet direction is γ, -10°≤γ≤10°. Specifically, the angle between the first folding plate 321 and the jet direction is 60°, the angle between the second folding plate 322 and the jet direction is 120°, and the angle between the third folding plate 323 and the jet direction is 0°. The flame stabilizing plate arranged in this way can provide the nozzle 200 with the best flame stabilizing effect. In other optional embodiments, the specific bending angle of the flame stabilizing plate can be designed by those skilled in the art using computational fluid dynamics methods according to actual working conditions, so that the flame and combustion are more stable.

[0036] Optionally, the base plate 310 has a mounting hole, into which a sleeve 311 is inserted, and the nozzle 200 is inserted. Furthermore, the sleeve 311, the base plate 310, and the two bent plates 320 are integrally formed. The nozzle 200 is mounted by fitting the sleeve 311 into the mounting hole of the base plate 310, and a seal is provided at the joint between the nozzle 200 and the sleeve 311. The integral formation of the base plate 310 and bent plates 320 simplifies and facilitates the manufacture of the flame stabilization plate, thereby reducing production costs.

[0037] The following is a detailed introduction to the dimensional parameters of the low-nitrogen burner 10 in this embodiment. The diameter of the nozzle 200 in the low-nitrogen burner 10 is Φ21.5 mm, the horizontal projection of the flame stabilizing plate is a rectangle of 160 mm × 160 mm, and the thickness of the flame stabilizing plate is 5 mm. A mounting hole is provided in the middle of the base plate 310, and both sides of the base plate 310 extend 10 mm in the jet direction of the nozzle 200. The overall vertical projection length of the base plate 310 is 36 mm; the vertical projection length of the first folded plate 321 is 35 mm, and the angle between the first folded plate 321 and the jet direction is 60°. ; The projection length of the second folding plate 322 in the vertical direction is 27 mm, the angle between the second folding plate 322 and the jet direction is 120°, the length of the third folding plate 323 in the horizontal direction is 100 mm, the angle between the third folding plate 323 and the jet direction is 0°, and the projection length of the flame stabilizing plate as a whole in the horizontal direction is 118.5 mm; further, two rows of air holes 330 are distributed on the first folding plate 321 in the flame stabilizing plate, each row includes 8 air holes 330 with a diameter of 8 mm, and one row of air holes 330 is distributed on the second folding plate 322, for a total of 8 air holes 330 with a diameter of 8 mm.

[0038] Please refer to Figure 3 and Figure 4 This embodiment further provides a flue heating device comprising a plurality of low-nitrogen burners 10 as described in any of the above embodiments. The low-nitrogen burners 10 of the flue heating device can provide a stable and continuous flame and are not affected by changes in the air flow rate within the flue 101. They can stably heat the flue gas within the flue 101 and achieve a more effective suppression of nitrogen oxide formation.

[0039] like Figure 3 As shown, the flue heating device further includes a fuel main pipe 20 connected to the fuel source. Multiple fuel sub-pipes 21 are connected to the fuel main pipe 20. These sub-pipes 21 extend perpendicularly from the outer wall of the flue 101 and into the flue 101. Multiple low-nitrogen burners 10 are mounted on these sub-pipes 21. In this configuration, the low-nitrogen burners 10 are independently fueled by multiple sub-pipes 21. These multiple sub-pipes 21 do not interfere with each other. When maintenance is required on one of the fuel sub-pipes 21, only that fuel sub-pipe 21 needs to be removed, eliminating the need for complete disassembly and maintenance. This improves maintenance efficiency and reduces costs.

[0040] Optionally, the plurality of low-nitrogen burners 10 on each of the above-mentioned fuel sub-tubes 21 are arranged side by side, and the flame-stabilizing plates of the plurality of low-nitrogen burners 10 on each of the above-mentioned fuel sub-tubes 21 are connected in sequence. In this embodiment, the plurality of flame-stabilizing plate wings are spliced and welded in sequence, or they can be integrally formed, and this embodiment does not impose any specific restrictions; the plurality of low-nitrogen burners 10 arranged side by side are connected in sequence through the flame-stabilizing plates to form a combustion channel on a fuel sub-tube 21, and each row of low-nitrogen burners 10 plays a role in mutual ignition, and when one of the low-nitrogen burners 10 goes out, the flame of the adjacent low-nitrogen burner 10 can be used to reignite, making the flue heating device more stable and reliable, and only one ignition device needs to be provided on one fuel sub-tube 21, thereby simplifying the structure of the flue heating device and reducing production costs. The ignition device can be an arc igniter, preferably provided on the low-nitrogen burner 10 at the head end of the fuel sub-tube 21, and this embodiment does not impose any specific restrictions.

[0041] Optionally, at least one of the low-nitrogen burners 10 on each of the above-mentioned fuel sub-pipes 21 is connected to one of the above-mentioned low-nitrogen burners 10 on the adjacent fuel sub-pipe 21. The two adjacent low-nitrogen burners 10 connected up and down can ignite each other to form a flame pilot channel, so that all the low-nitrogen burners 10 on the two upper and lower adjacent fuel sub-pipes 21 can share one ignition device. The specific ignition device can be adjusted according to actual needs. It is only necessary to ignite one of the low-nitrogen burners 10, and the flame can be transmitted up and down along the flame pilot channel to the low-nitrogen burner 10 on the adjacent fuel sub-pipe 21, thereby simplifying the requirements of the flue heating device for the ignition system and making the ignition operation of the flue heating device simpler and more convenient, which is beneficial to the actual application and operation of the flue heating device on site.

[0042] Furthermore, the low-nitrogen burner 10 at the end of each fuel sub-tube 21 is connected to the low-nitrogen burner 10 at the end of the adjacent fuel sub-tube 21, and the bending plates 320 of the two connected low-nitrogen burners 10 are connected to each other. Flame shields 11 are provided on both sides of the bending plates 320. Figure 4 , on the end of the fuel sub-tube 21, and the bent plates 320 of the two adjacent low-nitrogen burners 10 are connected together. Specifically, the third folding plate 323 is bent to a vertical state so that the two adjacent third folding plates 323 are on the same plane. Of course, the two adjacent third folding plates 323 can also be formed as one piece to further simplify the manufacturing process; the above-mentioned flame-blocking plates 11 are welded on the left and right sides of the bent third folding plate 323 to form a flame ignition channel between the two adjacent low-nitrogen burners 10, thereby facilitating the upward and downward propagation of the flame.

[0043] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Low nitrogen burner, characterized in that, include: A connector (100), the connector (100) being connected to a fuel source and capable of being fixed in a flue (101); a nozzle (200), the nozzle (200) being connected to and disposed on the joint (100), and the nozzle (200) being capable of spraying flames into the flue (101); A flame stabilizing plate, comprising a base plate (310) and two bent plates (320) arranged at opposite ends of the base plate (310), wherein the base plate (310) is mounted on the joint (100), and the bent plates (320) comprise a first folding plate (321), a second folding plate (322), and a third folding plate (323) connected in sequence, wherein the first folding plate (321) is mounted on the base plate (310), and the third folding plate (323) is extended toward the jetting direction of the nozzle (200), and an air vent (330) is provided on the first folding plate (321) and / or the second folding plate (322).

2. The low nitrogen burner according to claim 1, characterized in that The angle between the first folding plate (321) and the jet direction is α, 45°≤α≤75°; the angle between the second folding plate (322) and the jet direction is β, 105°≤β≤135°; the angle between the third folding plate (323) and the jet direction is γ, -10°≤γ≤10°.

3. The low nitrogen burner according to claim 1, characterized in that At least one row of ventilation holes (330) is provided on each of the first folding plate (321) and the second folding plate (322), and each row of ventilation holes (330) includes a plurality of ventilation holes (330) evenly spaced apart.

4. The low nitrogen burner according to claim 1, characterized in that A mounting hole is provided on the base plate (310), a sleeve (311) is inserted into the mounting hole, and the nozzle (200) is inserted into the sleeve (311).

5. The low nitrogen burner according to any one of claims 1 to 4, characterized in that: The base plate (310) and the two bent plates (320) are integrally formed.

6. Flue heating device, characterized in that, The invention comprises a plurality of low nitrogen burners (10) according to any one of claims 1 to 5.

7. The flue heating device according to claim 6, characterized in that: The flue heating device further comprises a fuel main pipe (20) connected to the fuel source, a plurality of fuel sub-pipes (21) are connected to the fuel main pipe (20), the fuel sub-pipes (21) are perpendicular to the outer wall of the flue (101) and extend into the flue (101), and a plurality of the low-nitrogen burners (10) are installed on the fuel sub-pipes (21).

8. The flue heating device according to claim 7, characterized in that: The multiple low-nitrogen burners (10) on each fuel sub-pipe (21) are arranged side by side, and the flame stabilizing plates of the multiple low-nitrogen burners (10) on each fuel sub-pipe (21) are connected in sequence.

9. The flue heating device according to claim 8, characterized in that: At least one of the low-nitrogen burners (10) on each of the fuel sub-pipes (21) is connected to a low-nitrogen burner (10) on an adjacent fuel sub-pipe (21).

10. The flue heating device according to claim 9, characterized in that: The low-nitrogen burner (10) at the end of each fuel sub-pipe (21) is connected to the low-nitrogen burner (10) at the end of the adjacent fuel sub-pipe (21), and the bending plates (320) of the two connected low-nitrogen burners (10) are connected to each other, and flame shielding plates (11) are provided on both sides of the bending plate (320).

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