Low-nitrogen combustor for industry

Abstract

The utility model discloses a low-nitrogen combustor for the industry, which belongs to the technical field of combustion equipment and comprises a combustor connecting pipe. The burner connecting pipe is provided with a fire observation mirror; a combustor body is fixedly connected to the middle end of the end, away from the boiler, of the combustor connecting pipe; the side wall of the burner body is provided with a spark plug used for ignition and an ignition fuel gas inlet pipe used for inlet of ignition fuel gas. The burner body is connected with a connecting pipe, the connecting pipe is connected with a multi-point gas outlet assembly used for gas inlet, and the multi-point gas outlet assembly is provided with a plurality of gas outlet points. The burner body is further connected with a rotational flow structure used for gas rotational flow, and the rotational flow direction can be adjusted. By means of the mode, the rotational flow structure conducts rotational flow treatment on inlet air of the draught fan, the tangential speed of combustion-supporting air is increased, in the same stroke distance, larger air quantity can be supplied, the stable air distribution function under different power conditions can be achieved, and the flame temperature can be further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of combustion equipment, in particular to a low-nitrogen burner for industrial applications. Background Art

[0002] A low-nitrogen burner is an auxiliary device used to ignite the mixture of air and gas and provide heat for a boiler, and it is widely used in the field of boiler equipment.

[0003] Chinese Patent CN212673215U discloses a low-nitrogen burner, which includes a burner cylinder body, a burner head cover, and a gas injection device; one end of the burner cylinder body is fixedly connected with the burner head cover; the gas injection device includes a main gas injection pipe and an auxiliary gas injection pipe; the auxiliary gas injection pipe is communicated with the main gas injection pipe; the diameter of the main gas injection pipe is larger than that of the auxiliary gas injection pipe; an auxiliary gas nozzle is arranged at the end of the auxiliary gas injection pipe, and a plurality of flow holes are arranged at the end of the main gas injection pipe; one end of the main gas injection pipe away from the auxiliary gas injection pipe is placed inside the burner cylinder body, and one end of the main gas injection pipe close to the auxiliary gas injection pipe and the auxiliary gas injection pipe are both arranged inside the burner head cover. Applying this technical solution can achieve the effects of high combustion efficiency and low NOx emissions.

[0004] However, the air inlet direction of the above structure is fixed. Although multiple jet structures can improve the mixing degree, the mixing degree still needs to be improved, resulting in a high flame temperature.

[0005] Based on this, the utility model designs a low-nitrogen burner for industrial applications to solve the above problems. Content of the Utility Model

[0006] In view of the above-mentioned drawbacks of the prior art, the utility model provides a low-nitrogen burner for industrial applications.

[0007] To achieve the above object, the utility model is realized through the following technical solutions: A low-nitrogen burner for industrial applications includes a burner connection pipe:

[0008] Observation ports are evenly arranged at equal intervals along the circumference at the end of the burner connection pipe away from the boiler;

[0009] A viewing mirror for observing the flame is fixedly connected to the outer end of the observation port of the burner connection pipe;

[0010] A burner body is fixedly connected to the middle end of the end of the burner connection pipe away from the boiler;

[0011] A spark plug for ignition and an ignition gas inlet pipe for inlet of ignition gas are arranged on the side wall of the burner body;

[0012] The burner body is connected with a connecting pipe, the connecting pipe is connected with a multi-point gas outlet assembly for gas inlet, and the multi-point gas outlet assembly is provided with a plurality of gas outlet points;

[0013] The burner body is also connected with a swirl structure for gas swirl and adjustable swirl direction;

[0014] The end of the burner body far from the burner connecting pipe is connected with a connecting flange connected to the air inlet end of the fan.

[0015] Furthermore, the gas outlet end of the ignition gas inlet pipe is aligned with the ignition end of the spark plug.

[0016] Furthermore, the distance between the gas outlet end of the ignition gas inlet pipe and the ignition end of the spark plug is 1-2 cm.

[0017] Furthermore, the multi-point gas outlet assembly includes a main gas inlet pipe, a combustion gun, spray holes, a flame stabilizing plate and a support rod. The main gas inlet pipe is fixedly connected and installed at the outer end of the connecting pipe. The inner end of the main gas inlet pipe is communicated and fixedly connected with the combustion gun. Spray holes are fixedly connected along the circumference at the middle end of the combustion gun. A flame stabilizing plate is fixedly connected to the end of the combustion gun close to the burner connecting pipe. Support rods are fixedly connected at equal intervals on the inner wall of the connecting pipe, and the support rods are fixedly connected with the outer wall of the combustion gun.

[0018] Furthermore, the spray holes are located at the side wall of the spark plug far from the burner connecting pipe.

[0019] Furthermore, the swirl structure includes a driving component, a linkage component and a swirl component. The driving component, the linkage component and the swirl component are connected with the connecting pipe. The driving component is connected with the linkage component, the linkage component is connected with the swirl component, and the swirl component is located inside the connecting pipe.

[0020] Furthermore, the driving component includes a driving shaft, a driving motor and a mounting bracket. The mounting bracket is fixedly installed on the side wall of the connecting pipe. The driving motor is installed on the mounting bracket. The driving end of the driving motor is connected with the driving shaft, and the driving shaft is connected with the linkage component.

[0021] Furthermore, the linkage component includes a first gear, a second gear, a slider and an arc-shaped guide rail. The second gear is meshed and connected with the driving shaft. The second gear is meshed and connected with the first gear along the circumference, and the first gear is connected with the swirl component. Sliders are fixedly connected at equal intervals along the circumference on the inner wall of the second gear. The sliders are in limit sliding connection with the arc-shaped guide rail, and the arc-shaped guide rail is fixedly connected with the outer wall of the connecting pipe.

[0022] Furthermore, the swirl component includes a horizontal shaft, a sector plate and an annular plate. The annular plate is rotatably connected with the horizontal shaft at equal intervals along the circumference. The sector plate is fixedly connected to the horizontal shaft. The outer end of the horizontal shaft is rotatably connected with the side wall of the connecting pipe, and the outer end of the horizontal shaft is fixedly installed in the mounting hole of the first gear.

[0023] Beneficial effects

[0024] The swirl structure of the present utility model performs swirl treatment on the air intake of the fan, increasing the tangential velocity of the combustion-supporting air. Within the same stroke distance, a larger air volume can be supplied, which can meet the stable air distribution function under different power conditions. It is further beneficial to reduce the flame temperature, achieve the purpose of reducing the generation of nitrogen oxides, and the swirl direction can be adjusted as needed; under the same fuel flow rate, the multiple air outlet points of the multi-point air outlet assembly increase the supply area, which can effectively reduce the temperature at the root of the flame. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or 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 some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Figure 1 is a three-dimensional view of the low-nitrogen burner structure for industrial applications of the present utility model Figure 1 ;

[0027] Figure 2 is a front view of the low-nitrogen burner for industrial applications of the present utility model;

[0028] Figure 3 is a right view of the low-nitrogen burner for industrial applications of the present utility model;

[0029] Figure 4 is a three-dimensional view of the low-nitrogen burner structure for industrial applications of the present utility model Figure 2 ;

[0030] Figure 5 is a sectional view along the A-A direction of Figure 3 ;

[0031] Figure 6 is a sectional view along the B-B direction of Figure 3 ;

[0032] Figure 7 is a schematic diagram of the swirl structure and its connection structure Figure 1 ;

[0033] Figure 8 is a schematic diagram of the swirl structure and its connection structure Figure 2 ;

[0034] Figure 9 is Figure 8 an enlarged view of the structure at C.

[0035] The reference numerals in the figure respectively represent:

[0036] 1. Burner connecting pipe; 2. Flame viewing mirror; 3. Burner body; 4. Flame viewing port; 5. Connecting pipe; 6. Swirl structure; 61. First gear; 62. Second gear; 63. Horizontal shaft; 64. Drive shaft; 65. Drive motor; 66. Mounting bracket; 67. Sector plate; 68. Annular plate; 69. Slide block; 610. Arc-shaped guide rail; 7. Multi-point gas outlet assembly; 71. Main gas inlet pipe; 72. Combustion gun; 73. Spray hole; 74. Flame stabilizing plate; 75. Support rod; 8. Connecting flange; 9. Spark plug; 10. Ignition gas inlet pipe. Specific embodiments

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0038] The present utility model will be further described below with reference to the embodiments.

[0039] In some embodiments, please refer to the accompanying specification Figures 1-9 , a low-nitrogen burner for the industrial industry, including a burner connecting pipe 1:

[0040] The end of the burner connecting pipe 1 away from the boiler is provided with flame viewing ports 4 at equal intervals along the circumferential direction;

[0041] A flame viewing mirror 2 for observing the flame is fixedly connected to the outer end of the flame viewing port 4 of the burner connecting pipe 1;

[0042] The middle end of the end of the burner connecting pipe 1 away from the boiler is fixedly connected with a burner body 3;

[0043] A spark plug 9 for ignition and an ignition gas inlet pipe 10 for inlet of ignition gas are provided on the side wall of the burner body 3.

[0044] The burner body 3 is connected with a connecting pipe 5, the connecting pipe 5 is connected with a multi-point gas outlet assembly 7 for gas inlet, and the multi-point gas outlet assembly 7 is provided with a plurality of gas outlet points.

[0045] The burner body 3 is further connected with a swirl structure 6 for gas swirl and adjustable swirl direction.

[0046] The end of the burner body 3 away from the burner connecting pipe 1 is connected with a connecting flange 8 connected to the air inlet end of the blower.

[0047] The swirling structure 6 swirls the air intake of the fan, increasing the tangential velocity of the combustion-supporting air. Within the same stroke distance, a larger air volume can be supplied, which can meet the stable air distribution function under different power conditions, further facilitating the reduction of the flame temperature and achieving the purpose of reducing the generation of nitrogen oxides. Moreover, the swirling direction can be adjusted as needed.

[0048] The multiple air outlet points of the multi-point air outlet assembly 7 increase the supply area under the same fuel flow rate, which can effectively reduce the temperature at the root of the flame.

[0049] Multiple viewing glasses 2 can perform multi-directional flame detection.

[0050] The burner connecting pipe 1 is connected to the boiler.

[0051] The outlet end of the ignition gas inlet pipe 10 is aligned with the ignition end of the spark plug 9;

[0052] The distance between the outlet end of the ignition gas inlet pipe 10 and the ignition end of the spark plug 9 is 1 - 2 cm;

[0053] In some embodiments, please refer to the attached drawings of the specification Figures 1-6 , the multi-point air outlet assembly 7 includes a main gas inlet pipe 71, a combustion gun 72, spray holes 73, a flame stabilizing plate 74, and a support rod 75. The main gas inlet pipe 71 is fixedly connected and installed at the outer end of the connecting pipe 5. The inner end of the main gas inlet pipe 71 communicates and is fixedly connected with the combustion gun 72. Spray holes 73 are fixedly connected along the circumferential direction at equal intervals in the middle of the combustion gun 72. A flame stabilizing plate 74 is fixedly connected to the end of the combustion gun 72 close to the burner connecting pipe 1. Support rods 75 are fixedly connected at equal intervals on the inner wall of the connecting pipe 5, and the support rods 75 are fixedly connected to the outer wall of the combustion gun 72.

[0054] The flame stabilizing plate 74 is located inside the burner connecting pipe 1.

[0055] The spray holes 73 are located on the side wall of the spark plug 9 away from the burner connecting pipe 1;

[0056] The main gas inlet pipe 71 is connected to the gas supply structure.

[0057] After ignition, the gas enters the combustion gun 72 through the main gas inlet pipe 71 and then sprays out from the multiple spray holes 73. The multiple spray holes 73 increase the supply area under the same fuel flow rate, which can effectively reduce the temperature at the root of the flame.

[0058] In some embodiments, please refer to the attached drawings of the specification Figures 1-9 , the swirling structure 6 includes a driving component, a linkage component, and a swirling component. The driving component, the linkage component, and the swirling component are connected to the connecting pipe 5. The driving component is connected to the linkage component, and the linkage component is connected to the swirling component. The swirling component is located inside the connecting pipe 5.

[0059] The drive assembly includes a drive shaft 64, a drive motor 65, and a mounting bracket 66. The mounting bracket 66 is fixedly installed on the side wall of the connecting pipe 5. The drive motor 65 is installed on the mounting bracket 66. The drive end of the drive motor 65 is connected to the drive shaft 64, and the drive shaft 64 is connected to the linkage assembly.

[0060] The linkage assembly includes a first gear 61, a second gear 62, a slider 69, and an arc-shaped guide rail 610. The second gear 62 is meshed and connected to the drive shaft 64. The second gear 62 is meshed with the first gear 61 along the circumferential direction, and the first gear 61 is connected to the swirl assembly. The inner wall of the second gear 62 is fixedly connected with sliders 69 at equal intervals along the circumferential direction. The sliders 69 are in limiting sliding connection with the arc-shaped guide rail 610. The arc-shaped guide rail 610 is fixedly connected to the outer wall of the connecting pipe 5.

[0061] The sector plate 67 and the annular plate 68 are both arranged inside the connecting pipe 5;

[0062] The swirl assembly includes a horizontal shaft 63, a sector plate 67, and an annular plate 68. The annular plate 68 is rotatably connected with the horizontal shaft 63 at equal intervals along the circumferential direction. The horizontal shaft 63 is fixedly connected with the sector plate 67. The outer end of the horizontal shaft 63 is rotatably connected to the side wall of the connecting pipe 5. The outer end of the horizontal shaft 63 is fixedly installed in the mounting hole of the first gear 61;

[0063] The drive motor 65 of the drive assembly of the swirl structure 6 drives the drive shaft 64 to rotate. Under the cooperation of the arc-shaped guide rail 610 and the slider 69, the drive shaft 64 drives the second gear 62 of the linkage assembly to rotate along the connecting pipe 5. The second gear 62 drives the first gear 61 to rotate. The first gear 61 drives the horizontal shaft 63 of the swirl assembly to rotate. The horizontal shaft 63 drives the sector plate 67 to rotate along the annular plate 68, adjusting the annular plate 68 to an inclined state. The swirl structure 6 performs swirl treatment on the air intake of the fan, increasing the tangential velocity of the combustion-supporting air. Within the same stroke distance, a larger air volume can be supplied, which can meet the stable air distribution function under different power conditions, further facilitating the reduction of the flame temperature and achieving the purpose of reducing the generation of nitrogen oxides. Moreover, the inclined state of the annular plate 68 can be adjusted as needed, and the swirl direction can be adjusted as needed.

[0064] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low nitrogen burner for industrial use, comprising a burner connecting pipe (1), characterized in that: The end of the burner connecting pipe (1) away from the boiler is provided with fire viewing holes (4) at equal intervals along the circumferential direction; A flame viewing mirror (2) for observing flames is fixedly connected to the burner connecting pipe (1) at the outer end of the flame viewing port (4); A burner body (3) is fixedly connected to the middle end of the burner connecting pipe (1) away from the boiler; A spark plug (9) for ignition and an ignition fuel gas inlet pipe (10) for ignition fuel gas intake are provided on the side wall of the burner body (3); The burner body (3) is connected to a connecting pipe (5), the connecting pipe (5) is connected to a multi-point gas outlet assembly (7) for gas intake, and the multi-point gas outlet assembly (7) is provided with a plurality of gas outlet points; The burner body (3) is also connected to a swirl structure (6) for gas swirl, the swirl direction of which is adjustable; The end of the burner body (3) away from the burner connecting pipe (1) is connected to a connecting flange (8) connected to the air inlet end of the fan.

2. The low nitrogen burner for industrial use according to claim 1, characterized in that: The gas outlet end of the ignition fuel gas inlet pipe (10) is aligned with the ignition end of the spark plug (9).

3. The low nitrogen burner for industrial use according to claim 2, characterized in that: The distance between the gas outlet end of the ignition gas inlet pipe (10) and the ignition end of the spark plug (9) is 1-2 cm.

4. The low nitrogen burner for industrial use according to claim 3, characterized in that: The multi-point gas outlet assembly (7) comprises a main gas inlet pipe (71), a combustion gun (72), a spray hole (73), a flame stabilizing plate (74) and a support rod (75); the main gas inlet pipe (71) is fixedly connected and installed on the outer end of the connecting pipe (5); the inner end of the main gas inlet pipe (71) is connected and fixedly connected to the combustion gun (72); the middle end of the combustion gun (72) is fixedly connected with the spray holes (73) at equal intervals along the circumferential direction; the end of the combustion gun (72) close to the burner connecting pipe (1) is fixedly connected with the flame stabilizing plate (74); the inner wall of the connecting pipe (5) is fixedly connected with the support rods (75) at equal intervals, and the support rods (75) are fixedly connected to the outer wall of the combustion gun (72).

5. The low nitrogen burner for industrial use according to claim 4, characterized in that: The spray hole (73) is located at the side wall of the spark plug (9) away from the burner connecting pipe (1).

6. The low nitrogen burner for industrial use according to any one of claims 1 to 5, characterized in that: The swirl structure (6) comprises a drive component, a linkage component and a swirl component. The drive component, the linkage component and the swirl component are connected to a connecting pipe (5). The drive component is connected to the linkage component, the linkage component is connected to the swirl component, and the swirl component is located in the connecting pipe (5).

7. The low nitrogen burner for industrial use according to claim 6, characterized in that: The driving assembly comprises a driving shaft (64), a driving motor (65) and a mounting frame (66); the mounting frame (66) is fixedly mounted on the side wall of the connecting pipe (5); the driving motor (65) is mounted on the mounting frame (66); the driving end of the driving motor (65) is connected to the driving shaft (64), and the driving shaft (64) is connected to the linkage assembly.

8. The low nitrogen burner for industrial use according to claim 7, characterized in that: The linkage assembly comprises a first gear (61), a second gear (62), a slider (69) and an arc-shaped guide rail (610); the second gear (62) is meshedly connected to a drive shaft (64); the second gear (62) is meshedly connected to the first gear (61) along the circumferential direction; the first gear (61) is connected to the swirl assembly; the inner wall of the second gear (62) is fixedly connected to the sliders (69) at equal intervals along the circumferential direction; the sliders (69) are limitedly slidably connected to the arc-shaped guide rail (610); and the arc-shaped guide rail (610) is fixedly connected to the outer wall of the connecting pipe (5).

9. The low nitrogen burner for industrial use according to claim 8, characterized in that: The swirl assembly comprises a transverse shaft (63), a sector plate (67) and an annular plate (68); the annular plate (68) is rotatably connected to the transverse shaft (63) at equal intervals along the circumferential direction; the sector plate (67) is fixedly connected to the transverse shaft (63); the outer end of the transverse shaft (63) is rotatably connected to the side wall of the connecting pipe (5); and the outer end of the transverse shaft (63) is fixedly installed in the installation hole of the first gear (61).

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