A low-nitrogen burner based on flue gas internal circulation

Abstract

The present invention relates to the technical field of low-nitrogen burners, and discloses a low-nitrogen burner based on flue gas internal circulation, including a central gas pipe. A central nozzle is fixedly installed at the output end of the central gas pipe. The inside of the central nozzle is in communication with the inside of the central gas pipe. Gas holes are equidistantly and circumferentially opened at the end of the central nozzle away from... A flame disk is fixedly installed on the outside of the central nozzle, and a burner housing is arranged on the outside of the flame disk. The burner housing includes an inner cylinder, and the inner cylinder is a circular sleeve and is fixedly installed on the outer ring gas pipe of the flame disk. In the present invention, the air sent into the burner from the air supply pipe is also divided into two paths. One part is sent into the connecting cylinder and sent into the furnace through the middle flame disk and the swirl vanes, and the other part enters the outer ring gas pipe and is sent into the furnace through the fifth connecting pipe, effectively dispersing the central air, reducing the gas flow rate of the direct-flow burner head, burning well after being mixed with the gas, and improving the combustion efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of low-nitrogen burners, and particularly to a low-nitrogen burner based on flue gas internal circulation. Background Art

[0002] Industrial boilers provide kinetic energy for the production of industries such as textiles, printing and dyeing, pharmaceuticals, chemicals, and oil refining; compared with coal and petroleum, natural gas is the cleanest among the three major petrochemical energy sources; natural gas is gradually changing from an alternative energy source to the main energy source. Natural gas burners have many advantages compared with oil and coal burners, such as stable combustion flame, high combustion thermal efficiency, low noise, relatively less harmful gases and soot, etc.

[0003] At present, the design of effectively dispersing the central air in low-nitrogen combustion is not reasonable enough, the gas flow rate of the direct-flow combustion head is too low, and the gas combustion efficiency is low. For this reason, we propose a low-nitrogen burner based on flue gas internal circulation. Summary of the Invention

[0004] The present invention mainly solves the technical problems existing in the above-mentioned prior art, and provides a low-nitrogen burner based on flue gas internal circulation.

[0005] To achieve the above object, the present invention adopts the following technical solution. A low-nitrogen burner based on flue gas internal circulation includes a central gas pipe. A central nozzle is fixedly installed at the output end of the central gas pipe. The inside of the central nozzle is in communication with the inside of the central gas pipe. Gas small holes are equidistantly and circumferentially opened on the central nozzle away from the center. A flame plate is fixedly installed outside the central nozzle. A burner housing is arranged outside the flame plate. The burner housing includes an inner cylinder. The inner cylinder is a circular sleeve and is fixedly installed on the outer ring gas pipe outside the flame plate. One end of the flame plate is fixedly connected with a gas inner spray pipe corresponding to the inside of the inner cylinder. Arc-shaped rings are fixedly installed on the outside of the inner cylinder at equal intervals. A connecting cylinder is fixedly installed on the end face of the arc-shaped ring. A mounting flange is fixedly installed outside the connecting cylinder. The mounting flange is an annular disc. A gas cavity is fixedly installed at one end of the mounting flange away from the inner cylinder corresponding to the outside of the connecting cylinder. The gas cavity is a circular barrel shape. Second clamping holes are equidistantly and circumferentially opened on the side face of the mounting flange corresponding to the gap between the connecting cylinder and the gas cavity. The second clamping holes are circular through holes. An air outer cavity is fixedly installed at one end of the mounting flange away from the inner cylinder corresponding to the outside of the gas cavity. The air outer cavity is a circular barrel shape. First clamping holes are equidistantly and circumferentially opened on the side face of the mounting flange corresponding to the gap between the gas cavity and the air outer cavity. The first clamping holes are circular through holes. A swirl vane is fixedly installed at one end of the flame plate away from the gas inner spray pipe.

[0006] Preferably, a gas inner spray pipe is arranged inside the second clamping hole, and a gas outer spray pipe is arranged inside the first clamping hole.

[0007] Preferably, the gas inner injection pipe includes an outer ring gas pipe, which is clamped inside the second clamping hole. One end of the outer ring gas pipe is fixedly installed with a first connecting pipe, and the first connecting pipe is a frustum-shaped expanding pipe. A second connecting pipe is clamped outside the first connecting pipe, and the second connecting pipe is a frustum-shaped expanding pipe. One end of the second connecting pipe away from the outer ring gas pipe is fixedly installed with a third connecting pipe, and the third connecting pipe is a circular pipe. One end of the third connecting pipe away from the second connecting pipe is fixedly installed with a first transition pipe, and one end of the first transition pipe away from the third connecting pipe is fixedly installed with a second transition pipe.

[0008] Preferably, a connecting ring is fixedly installed on the outer side of the outer ring gas pipe. The connecting ring is a circular block. A first extrusion block is fixedly installed on the end face of the connecting ring corresponding to the end face of the second connecting pipe. The first extrusion block is an annular block with an arc-shaped cross section. A second extrusion block is fixedly installed on the end face of the connecting ring corresponding to the position of the first extrusion block. The second extrusion block is an "S"-shaped block.

[0009] Preferably, a clamping groove is formed on the end face of the connecting ring. The clamping groove is an annular block with a parallelogram cross section. A connecting block is fixedly installed on the outer side of the fourth connecting pipe. The connecting block is an annular block with a triangular cross section. A clamping block is fixedly installed on the side of the connecting block close to the clamping groove. The clamping block is a parallelogram block and is clamped inside the clamping groove.

[0010] Preferably, the arc-shaped ring is an arc-shaped block.

[0011] Preferably, the gas outer injection pipe includes an outer ring air pipe, which is clamped inside the first clamping hole. A fourth connecting pipe is sleeved on the outer side of the outer ring air pipe. One end of the fourth connecting pipe away from the outer ring air pipe is fixedly installed with a fifth connecting pipe, and the fifth connecting pipe is a frustum-shaped pipe.

[0012] Preferably, a blocking block is fixedly installed inside the fourth connecting pipe. The blocking block is an annular block, and the outer ring air pipe is arranged on the side of the fourth connecting pipe.

[0013] Beneficial effects

[0014] The present invention provides a low-nitrogen burner based on flue gas internal circulation. It has the following beneficial effects:

[0015] (1) The low-nitrogen burner based on flue gas internal circulation divides natural gas into two paths and sends it into the furnace for combustion. A small part is input from the central gas pipe to facilitate ignition and flame stabilization. Most of the gas is sent into the gas chamber and ejected from the second transition pipe and the fifth connecting pipe respectively, so that the gas diffuses and has a better mixing effect with air. The air sent into the burner from the air supply pipe is also divided into two paths. One part is sent into the connecting cylinder and sent into the furnace through the middle flame plate and swirl vanes. The other part enters the outer ring gas pipe and is sent into the furnace through the fifth connecting pipe, effectively dispersing the central air, reducing the gas flow rate of the direct-flow burner head, and burning after being well mixed with the gas, thus improving the combustion efficiency.

[0016] (2) The low-nitrogen burner based on flue gas internal circulation restricts the displacement of the outer ring air pipe through the stop block, which is convenient and intuitive to set the depth of the outer ring air pipe inserted into the fourth connecting pipe, is easy to use, and enhances the practicability of the device.

[0017] (3) The low-nitrogen burner based on flue gas internal circulation is connected between the outer ring gas pipe and the third connecting pipe through the second connecting pipe and the first connecting pipe, which is convenient to use and enhances the practicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary. For those of ordinary skill in the art, without creative efforts, other implementation drawings can be obtained according to the provided drawings.

[0019] The structures, ratios, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have technical essential significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a partial structure schematic diagram of the outer ring air pipe of the present invention;

[0022] Figure 3 It is a partial structure schematic diagram of the air outer chamber of the present invention;

[0023] Figure 4 It is a partial structure schematic diagram of the outer ring gas pipe of the present invention;

[0024] Figure 5 For the present invention Figure 4 is a schematic enlarged view of the structure at position A in the present invention.

[0025] Legend:

[0026] 1. Outer ring gas pipe; 2. Outer ring air pipe; 3. Central gas pipe; 4. Flame plate; 5. Gas inner spray pipe; 6. Air outer cavity; 7. Gas cavity; 8. Connecting cylinder; 9. Swirl vane; 10. Inner cylinder; 11. Arc ring; 12. Installation flange; 14. Central spray head; 15. Gas small hole; 18. First clamping hole; 19. Second clamping hole; 20. First connecting pipe; 21. Second connecting pipe; 22. Third connecting pipe; 23. First transition pipe; 24. Second transition pipe; 25. First extrusion block; 26. Second extrusion block; 27. Card slot; 28. Clamping block; 29. Connecting block; 30. Connecting ring; 31. Fourth connecting pipe; 32. Fifth connecting pipe; 33. Stopper. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Embodiment: A low-nitrogen burner based on flue gas internal circulation, as Figure 1 - Figure 5As shown in the figure, it includes a central gas pipe 3. At the output end of the central gas pipe 3, a central nozzle 14 is fixedly installed. The inside of the central nozzle 14 is interconnected with the inside of the central gas pipe 3. The central nozzle 14 is provided with gas small holes 15 at equal intervals in the circumferential direction away from it. A flame disk 4 is fixedly installed outside the central nozzle 14. A burner housing is arranged outside the flame disk 4. The burner housing includes an inner cylinder 10. The inner cylinder 10 is a circular sleeve and is fixedly installed on the outer ring gas pipe 1 outside the flame disk 4. One end of the flame disk 4 is fixedly connected with a gas inner spray pipe 5 corresponding to the inside of the inner cylinder 10. Arc-shaped rings 11 are fixedly installed on the outside of the inner cylinder 10 at equal intervals. A connecting cylinder 8 is fixedly installed on the end face of the arc-shaped ring 11. An installation flange 12 is fixedly installed outside the connecting cylinder 8. The installation flange 12 is an annular disk. A gas cavity 7 is fixedly installed at one end of the installation flange 12 away from the inner cylinder 10 corresponding to the outside of the connecting cylinder 8. The gas cavity 7 is a circular barrel shape. Second clamping holes 19 are arranged at equal intervals in the circumferential direction on the side face of the installation flange 12 corresponding to the gap between the connecting cylinder 8 and the gas cavity 7. The second clamping holes 19 are circular through holes. An air outer cavity 6 is fixedly installed at one end of the installation flange 12 away from the inner cylinder 10 corresponding to the outside of the gas cavity 7. The air outer cavity 6 is a circular barrel shape. First clamping holes 18 are arranged at equal intervals in the circumferential direction on the side face of the installation flange 12 corresponding to the gap between the gas cavity 7 and the air outer cavity 6. The first clamping holes 18 are circular through holes. A swirl blade 9 is fixedly installed at one end of the flame disk 4 away from the gas inner spray pipe 5. The swirl blade 9 is a prior art and will not be elaborated here;

[0029] The gas inner spray pipe 5 is arranged inside the second clamping hole 19, and a gas outer spray pipe is arranged inside the first clamping hole 18;

[0030] The gas inner spray pipe 5 includes an outer ring gas pipe 1. The outer ring gas pipe 1 is clamped inside the second clamping hole 19. One end of the outer ring gas pipe 1 is fixedly installed with a first connecting pipe 20. The first connecting pipe 20 is a frustum-shaped expanding pipe. A second connecting pipe 21 is clamped outside the first connecting pipe 20. The second connecting pipe 21 is a frustum-shaped expanding pipe. One end of the second connecting pipe 21 away from the outer ring gas pipe 1 is fixedly installed with a third connecting pipe 22. The third connecting pipe 22 is a circular pipe. One end of the third connecting pipe 22 away from the second connecting pipe 21 is fixedly installed with a first transition pipe 23. One end of the first transition pipe 23 away from the third connecting pipe 22 is fixedly installed with a second transition pipe 24;

[0031] A connecting ring 30 is fixedly installed outside the outer ring gas pipe 1. The connecting ring 30 is a circular block. A first extrusion block 25 is fixedly installed on the end face of the connecting ring 30 corresponding to the end face of the second connecting pipe 21. The first extrusion block 25 is an annular block with an arc-shaped cross section. A second extrusion block 26 is fixedly installed at the position of the connecting ring 30 corresponding to the first extrusion block 25. The second extrusion block 26 is an "S"-shaped block;

[0032] The end face of the connecting ring 30 is provided with a clamping groove 27. The clamping groove 27 is an annular block with a parallelogram cross-section. A connecting block 29 is fixedly installed on the outer side of the fourth connecting pipe 31. The connecting block 29 is an annular block with a triangular cross-section. A clamping block 28 is fixedly installed on the side of the connecting block 29 close to the clamping groove 27. The clamping block 28 is a parallelogram block and is clamped inside the clamping groove 27.

[0033] The arc-shaped ring 11 is an arc-shaped block.

[0034] The gas outer spray pipe includes an outer ring air pipe 2. The outer ring air pipe 2 is clamped inside the first clamping hole 18. A fourth connecting pipe 31 is sleeved on the outer side of the outer ring air pipe 2. One end of the fourth connecting pipe 31 far from the outer ring air pipe 2 is fixedly installed with a fifth connecting pipe 32. The fifth connecting pipe 32 is a frustum-shaped pipe.

[0035] A blocking block 33 is fixedly installed inside the fourth connecting pipe 31. The blocking block 33 is an annular block. The outer ring air pipe 2 is arranged on the side of the fourth connecting pipe 31.

[0036] The working principle of the present invention:

[0037] When in use, this structure sends natural gas into the furnace for combustion in two paths. A small part enters from the central gas pipe 3 to facilitate ignition and flame stabilization. Most of the gas enters the combustion chamber 7 and is ejected from the second transition pipe 24 and the fifth connecting pipe 32 respectively, so that the gas diffuses and has a better mixing effect with air. The air sent from the air supply pipe to the burner is also divided into two paths. One part enters the connecting cylinder 8 and is sent into the furnace through the middle flame plate 4 and the swirl vane 9. One part enters the outer ring gas pipe 1 and is sent into the furnace through the fifth connecting pipe 32, effectively dispersing the central air, reducing the gas flow rate of the direct-flow burner head, and burning well after mixing with the gas, improving the combustion efficiency.

[0038] The displacement of the outer ring air pipe 2 is restricted by the blocking block 33, which facilitates visually setting the depth of the outer ring air pipe 2 inserted into the fourth connecting pipe 31. It is convenient to use and enhances the practicability of the device.

[0039] The outer ring gas pipe 1 and the third connecting pipe 22 are connected through the second connecting pipe 21 and the first connecting pipe 20, which is convenient to use and enhances the practicability of the device.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0041] It should be noted that like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

[0042] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model.

[0043] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.

[0044] In the present utility model, unless otherwise clearly defined and limited, terms such as "installed", "connected", "connected to", "fixed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0045] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

Claims

1. A low-nitrogen burner based on flue gas internal circulation, comprising a central gas pipe (3), characterized in that: A central spray head (14) is fixedly installed at the output end of the central gas pipe (3). The interior of the central spray head (14) is in communication with the interior of the central gas pipe (3). The central spray head (14) is provided with gas small holes (15) equidistantly and circumferentially away from it. A flame plate (4) is fixedly installed outside the central spray head (14). A burner housing is arranged outside the flame plate (4). The burner housing includes an inner cylinder (10). The inner cylinder (10) is a circular sleeve and is fixedly installed on the outer ring gas pipe (1) outside the flame plate (4). One end of the flame plate (4) is fixedly connected to a gas inner spray pipe (5) corresponding to the inside of the inner cylinder (10). Arc-shaped rings (11) are fixedly installed equidistantly outside the inner cylinder (10). A connecting cylinder (8) is fixedly installed on the end face of the arc-shaped ring (11). A mounting flange (12) is fixedly installed outside the connecting cylinder (8). The mounting flange (12) is an annular disc. A gas chamber (7) is fixedly installed at one end of the mounting flange (12) away from the inner cylinder (10) corresponding to the outside of the connecting cylinder (8). The gas chamber (7) is a circular barrel shape. Second clamping holes (19) are equidistantly and circumferentially arranged on the side face of the mounting flange (12) corresponding to the gap between the connecting cylinder (8) and the gas chamber (7). The second clamping holes (19) are circular through holes. An air outer chamber (6) is fixedly installed at one end of the mounting flange (12) away from the inner cylinder (10) corresponding to the outside of the gas chamber (7). The air outer chamber (6) is a circular barrel shape. First clamping holes (18) are equidistantly and circumferentially arranged on the side face of the mounting flange (12) corresponding to the gap between the gas chamber (7) and the air outer chamber (6). The first clamping holes (18) are circular through holes. A swirl vane (9) is fixedly installed at one end of the flame plate (4) away from the gas inner spray pipe (5). The gas inner spray pipe (5) is arranged inside the second clamping holes (19). A gas outer spray pipe is arranged inside the first clamping holes (18). The gas inner spray pipe (5) includes an outer ring gas pipe (1). The outer ring gas pipe (1) is clamped inside the second clamping holes (19). One end of the outer ring gas pipe (1) is fixedly installed with a first connecting pipe (20). The first connecting pipe (20) is a frustum-shaped expanding pipe. A second connecting pipe (21) is clamped outside the first connecting pipe (20). The second connecting pipe (21) is a frustum-shaped expanding pipe. One end of the second connecting pipe (21) away from the outer ring gas pipe (1) is fixedly installed with a third connecting pipe (22). The third connecting pipe (22) is a circular pipe. One end of the third connecting pipe (22) away from the second connecting pipe (21) is fixedly installed with a first transition pipe (23). One end of the first transition pipe (23) away from the third connecting pipe (22) is fixedly installed with a second transition pipe (24).

2. The low-nitrogen burner based on flue gas internal circulation according to claim 1, characterized in that: A connecting ring (30) is fixedly installed on the outer side of the outer ring gas pipe (1). The connecting ring (30) is a circular block. A first extrusion block (25) is fixedly installed on the end face of the connecting ring (30) corresponding to the end face of the second connecting pipe (21). The first extrusion block (25) is an annular block with an arc-shaped cross section. A second extrusion block (26) is fixedly installed on the end face of the connecting ring (30) at the position corresponding to the first extrusion block (25). The second extrusion block (26) is an "S"-shaped block.

3. The low-nitrogen burner based on flue gas internal circulation according to claim 2, characterized in that: A clamping groove (27) is formed on the end face of the connecting ring (30). The clamping groove (27) is an annular block with a parallelogram cross section. A connecting block (29) is fixedly installed on the outer side of the fourth connecting pipe (31). The connecting block (29) is an annular block with a triangular cross section. A clamping block (28) is fixedly installed on the side of the connecting block (29) close to the clamping groove (27). The clamping block (28) is a parallelogram block and is clamped inside the clamping groove (27).

4. A low-nitrogen burner based on flue gas internal circulation according to claim 3, characterized in that: The arc-shaped ring (11) is an arc-shaped block.

5. The low-nitrogen burner based on flue gas internal circulation according to claim 4, characterized in that: The gas outer spray pipe includes an outer ring air pipe (2). The outer ring air pipe (2) is clamped inside the first clamping hole (18). A fourth connecting pipe (31) is sleeved on the outer side of the outer ring air pipe (2). A fifth connecting pipe (32) is fixedly installed at the end of the fourth connecting pipe (31) away from the outer ring air pipe (2). The fifth connecting pipe (32) is a frustum-shaped pipe.

6. The low-nitrogen burner based on flue gas internal circulation according to claim 5, wherein: A blocking block (33) is fixedly installed inside the fourth connecting pipe (31). The blocking block (33) is an annular block. The outer ring air pipe (2) is arranged on the side of the fourth connecting pipe (31).

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