Low-nitrogen combustion head
By designing inclined exhaust holes and air guide plate structures on the low-nitrogen combustion head, the flame revolving combustion is solved, and the problems of fire aggregation and nitrogen oxide generation caused by linear exhaust passages are achieved, low nitrogen oxide emissions and explosion-proof effects are achieved, and energy-saving advantages are provided.
Patent Information
- Application Number
- CN202422090371.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-27
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-27
AI Technical Summary
The exhaust passages of the existing low-nitrogen combustion heads are linear structures, which leads to the fire easily gathering together, increasing the risk of nitrogen oxide generation and explosion.
A low-nitrogen combustion head is designed, adopting an inclined exhaust hole and air guide plate structure, so that the fire burns around the cylinder in the cyclic direction, and fuel and air enter the cavity in the cyclic direction, forming a flue gas circulation and reducing the temperature at the combustion site.
It significantly improves the anti-temperature ability, reduces the production of nitrogen oxides, and the nitrogen oxide concentration is less than or equal to 30mg/m3, reduces the combustion head temperature, reduces the risk of explosion, and achieves an energy-saving combustion effect.
Smart Images
Figure CN223036400U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of burners, in particular to a low-nitrogen burner head. Background Technique
[0002] A burner is a general term for a device that sprays and mixes fuel and air for combustion. A low-nitrogen burner is a device that adds a blower, an induced draft fan, a frequency converter, uses a control valve, and integrates multiple circuits to make clean energy and the burner operate to provide more efficient heat energy for the boiler.
[0003] During the combustion process, thermal nitrogen oxides are mainly generated. As the temperature of the flame and the combustion area increases, the emission of the pollutant nitrogen oxides also increases exponentially.
[0004] The flue gas recirculation technology is a low-nitrogen combustion technology and is widely used in boiler systems. The flue gas recirculation technology uses the flue gas generated by combustion, the main components of which are carbon dioxide, water vapor and nitrogen. Through a circulation method, the non-combustible flue gas is transported back to the combustion area again, so that during the chemical reaction of combustion, the combustible and the oxidant are diluted by the flue gas and then burned, so as to reduce the intensity of the combustion reaction, reduce the flame temperature, and at the same time make the temperature of the combustion area also drop, effectively weakening the conditions for oxygen and nitrogen to generate thermal nitrogen oxides, thereby reducing the generation of nitrogen oxides.
[0005] The low-nitrogen burner head is an important part of the low-nitrogen burner and is also an important link in realizing the flue gas recirculation technology. The low-nitrogen burner obtains the best combustion parameters through the low-nitrogen burner head, thereby reducing thermal nitrogen oxides. The fire burns outside the low-nitrogen burner head, and the gas enters through the opening of the low-nitrogen burner head and then is discharged through the exhaust passage to assist the fire combustion.
[0006] The exhaust passage of the existing low-nitrogen burner head is a straight structure, which keeps the direction of the fire combustion in a straight line. This structure has the problem that the fire is easy to gather together, making that area always in a high-temperature state, intensifying the generation of nitrogen oxides, and also increasing the risk of explosion of the low-nitrogen burner head. Content of the Utility Model
[0007] The purpose of the utility model is to overcome the defects and deficiencies existing in the prior art, and to provide a low-nitrogen burner head. The utility model has remarkable anti-backfire ability, making the nitrogen oxides less than or equal to 30 mg / m 3 , reducing the temperature at the combustion part of the burner head.
[0008] The technical solution adopted by the present utility model is as follows: A low-nitrogen combustion head, comprising a cylinder body with an opening at one end. A connecting flange is further provided at the end of the cylinder body with the opening. The end of the cylinder body far from the opening is closed. A cavity for heating fuel and air is formed inside the cylinder body. At least one set of anti-backfire rings is provided on the side wall of the cylinder body near the closed end. The anti-backfire rings include several groups of anti-backfire loops. The several groups of anti-backfire loops are evenly distributed along the axial direction of the cylinder body. The anti-backfire loop includes several exhaust holes that are circumferentially surrounded and evenly distributed along the cylinder body. The exhaust holes are inclined, and an included angle is provided between the median line of the exhaust holes and the axis of the cylinder body. A wind guide plate for guiding fuel and air to enter the cavity along a swirling wind direction is provided at the inner edge of the cylinder body near the opening.
[0009] The wind guide plate includes a connecting block and a connecting ring. The connecting block is located at the axis of the cylinder body. The connecting block is connected to the connecting ring through several inclined first blades. The several first blades are evenly distributed circumferentially around the connecting block. The connecting ring is connected to the inner wall of the cylinder body through several inclined second blades. The several second blades are evenly distributed circumferentially around the connecting ring. The inclination directions of the first blades and the second blades are opposite. A first air duct is formed between the connecting ring and the connecting block, and a second air duct is formed between the connecting ring and the inner wall of the cylinder body.
[0010] The slope of the first blade is greater than that of the second blade.
[0011] The wind guide plate is made of sheet metal, and both the first blade and the second blade are formed by torsion.
[0012] The cross-section of the exhaust hole is rectangular and includes a long side and a wide side, and the lengths of the long side and the wide side are in proportion.
[0013] The length of the long side is 1 mm, and the length of the wide side is 0.5 mm.
[0014] The included angle is 45°.
[0015] Three sets of anti-backfire rings are provided, and the intervals between every two adjacent sets of anti-backfire rings are the same.
[0016] The beneficial effects of the present utility model are as follows: In the present utility model, the fire burns around the cylinder body in a swirling direction through the inclined exhaust holes on the cylinder body, and the fuel and air enter the cavity in a swirling direction through the wind guide plate, having remarkable anti-backfire ability. One end of the cylinder body is closed, and the fuel and air blown in from the opening will collide with the inner wall of the closed end and rebound, forming a flue gas circulation, reducing the temperature at the combustion part of the combustion head, reducing the generation of nitrogen oxides, and the nitrogen oxides are less than or equal to 30 mg / m 3, the burner head is not easily blocked. It directly emits gas for combustion from the exhaust holes. Natural gas, liquefied gas, and biogas can all be used as the fuel for this fuel head. The pressure requirements for the fuel and air are low, the fuel consumption is small, and it is energy-saving. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, obtaining other drawings based on these drawings still belongs to the scope of the present invention.
[0018] Figure 1 is a schematic structural diagram of a low-nitrogen burner head of the present invention;
[0019] Figure 2 is a schematic structural diagram of another perspective of the present invention;
[0020] Figure 3 is a schematic partial structural diagram of the opening in the present invention;
[0021] Figure 4 is a schematic partial structural diagram of the exhaust hole in the present invention;
[0022] Figure 5 is a schematic diagram of the air flow direction of the present invention;
[0023] In the figure, 1 - opening, 2 - cylinder body, 3 - connecting flange, 4 - closed end, 5 - flashback preventer, 6 - exhaust hole, 7 - included angle, 8 - air guiding plate, 9 - connecting block, 10 - connecting ring, 11 - first blade, 12 - second blade, 13 - long side, 14 - wide side. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0024] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will further describe the present invention in detail with reference to the drawings.
[0025] It should be noted that all the expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two entities or parameters with the same name but different. It can be seen that "first" and "second" are only for the convenience of expression and should not be construed as a limitation on the embodiments of the present invention. This will not be elaborated one by one in the subsequent embodiments.
[0026] The directional and positional terms mentioned in this utility model, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "top", "bottom", "side", etc., are only with reference to the directions or positions in the attached drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, rather than limiting the protection scope of this utility model.
[0027] As Figures 1 to 5 shown, it is an embodiment of this utility model, a low-nitrogen burner head, which includes a cylinder body 2 with an opening 1 at one end. A connecting flange 3 is also provided at the end of the cylinder body 2 with the opening 1. The end of the cylinder body 2 far away from the opening 1 is a closed end 4. A cavity for heating fuel and air is formed inside the cylinder body 2. At least one set of anti-backfire rings 5 is provided on the side wall of the cylinder body 2 near the closed end 4. The anti-backfire rings 5 include several groups of anti-backfire loops. The several groups of anti-backfire loops are evenly distributed along the axial direction of the cylinder body 2. Each anti-backfire loop includes several exhaust holes 6 that are circumferentially surrounded and evenly distributed along the cylinder body 2. The exhaust holes 6 are inclined, and an included angle 7 is provided between the median line of the exhaust holes 6 and the axis of the cylinder body 2. A wind guide plate 8 for guiding fuel and air to enter the cavity along a swirling wind direction is provided at the inner edge of the cylinder body 2 near the opening 1.
[0028] The beneficial effects of such a setting are as follows. In this utility model, the fire burns around the cylinder body in a swirling direction through the inclined exhaust holes on the cylinder body, and the fuel and air enter the cavity in a swirling direction through the wind guide plate, having remarkable anti-backfire ability. One end of the cylinder body is a closed end, and the fuel and air blown in from the opening will collide with the inner wall of the closed end and rebound, forming a flue gas circulation, reducing the temperature at the combustion part of the burner head and reducing the generation of nitrogen oxides. The nitrogen oxides are less than or equal to 30 mg / m 3 , the burner head is not easily blocked, and the gas directly exits from the exhaust holes for combustion. Natural gas, liquefied gas, and biogas can all be used as the fuel for this fuel head. The air pressure requirements for fuel and air are low, the fuel consumption is small, and it is energy-saving.
[0029] Further setting, the wind guide plate 8 includes a connecting block 9 and a connecting ring 10. The connecting block 9 is located at the axis of the cylinder body 2. The connecting block 9 is connected to the connecting ring 10 through several inclined first blades 11. The several first blades 11 are evenly distributed circumferentially around the connecting block 9. The connecting ring 10 is connected to the inner wall of the cylinder body 2 through several inclined second blades 12. The several second blades 12 are evenly distributed circumferentially around the connecting ring 10. The inclined directions of the first blades 11 and the second blades 12 are opposite. A first air duct is formed between the connecting ring 10 and the connecting block 9, and a second air duct is formed between the connecting ring 10 and the inner wall of the cylinder body 2.
[0030] The beneficial effects of such a setting are as follows. By means of the first blade and the second blade with different inclination directions, the fuel and air passing through the corresponding first air duct and second air duct have opposite swirling directions, so that the fuel and air are more evenly mixed after entering the cavity.
[0031] Further setting: the slope of the first blade 11 is greater than that of the second blade 12.
[0032] The beneficial effects of such a setting are as follows. The inclination angles of both the first blade and the second blade are based on the end face of the connecting ring. The inclination angle of the first blade is greater than that of the second blade. Therefore, the swirling angle of the fuel and air passing through the second air duct is larger than that of the first air duct, which further helps the fuel and air to be evenly mixed and also helps the flame outside the exhaust hole to maintain a swirling combustion direction.
[0033] Further setting: the air guiding plate 8 is made of sheet metal, and both the first blade 11 and the second blade 12 are formed by torsion.
[0034] The beneficial effects of such a setting are as follows. Forming by torsion has the advantages of material saving, high connection strength and easy forming.
[0035] Further setting: the cross section of the exhaust hole 6 is rectangular and includes a long side 13 and a wide side 14, and the lengths of the long side 13 and the wide side 14 are in proportion.
[0036] The beneficial effects of such a setting are as follows. Control the volume of the flame outside the exhaust hole, disperse the flame, and effectively inhibit the generation of nitrogen oxides.
[0037] Further setting: the length of the long side 13 is 1 mm, and the length of the wide side 14 is 0.5 mm.
[0038] The beneficial effects of such a setting are as follows. Through experiments, the exhaust hole with such dimensions can control the best air output, control the combustion flame, and prevent the flame from surging.
[0039] Further setting: the included angle 7 is 45°.
[0040] The beneficial effects of such a setting are as follows. Help the flame to burn in an inclined direction.
[0041] Further setting: there are three groups of anti-backfire rings 5, and the intervals between every two adjacent groups of anti-backfire rings 5 are the same.
[0042] The beneficial effects of such a setting are as follows. Disperse the range of the combustion flame and adapt to the air intake volume, which can not only maintain a good combustion effect, but also prevent the combustion flame of the burner head from gathering and maintaining a high temperature to cause explosion.
[0043] The above-disclosed is only the preferred embodiment of the present utility model, and of course, it cannot be used to limit the scope of rights of the present utility model. Therefore, equivalent changes made according to the claims of the present utility model still fall within the scope covered by the present utility model.
Claims
1. A low nitrogen burner head, comprising a cylinder (2) with an opening (1) at one end, wherein the end of the cylinder (2) with the opening (1) is also provided with a connecting flange (3), characterized in that: The end of the cylinder (2) away from the opening (1) is a closed opening (4), and a cavity for heating fuel and air is formed inside the cylinder (2). The side wall of the end of the cylinder (2) close to the closed opening (4) is provided with at least one group of anti-flashback rings (5), and the anti-flashback rings (5) include a plurality of groups of anti-flashback rings, and the plurality of groups of anti-flashback rings are evenly distributed along the axial direction of the cylinder (2). The anti-flashback rings include a plurality of exhaust holes (6) circumferentially surrounding the cylinder (2) and evenly distributed, and the exhaust holes (6) are arranged in an inclined manner, and an angle (7) is provided between the midline of the exhaust hole (6) and the axis of the cylinder (2). The inner edge of the end of the cylinder (2) close to the opening (1) is provided with a wind guide plate (8) for guiding fuel and air to enter the cavity along the rotating wind direction.
2. A low nitrogen burner head according to claim 1, characterized in that: The air guide plate (8) comprises a connecting block (9) and a connecting ring (10); the connecting block (9) is located at the axis of the cylinder (2); the connecting block (9) is connected to the connecting ring (10) via a plurality of inclined first blades (11); the plurality of first blades (11) are evenly distributed around the connecting block (9); the connecting ring (10) is connected to the inner wall of the cylinder (2) via a plurality of inclined second blades (12); the plurality of second blades (12) are evenly distributed around the connecting ring (10); the first blades (11) and the second blades (12) are inclined in opposite directions; a first air duct is formed between the connecting ring (10) and the connecting block (9); and a second air duct is formed between the connecting ring (10) and the inner wall of the cylinder (2).
3. A low nitrogen burner head according to claim 2, characterized in that: The first blade (11) has a greater inclination than the second blade (12).
4. A low nitrogen burner head according to claim 2, characterized in that: The wind guide plate (8) is made of sheet metal, and the first blade (11) and the second blade (12) are both twisted.
5. A low nitrogen burner head according to claim 1, characterized in that: The exhaust hole (6) has a rectangular cross section and comprises a long side (13) and a wide side (14), and the length of the long side (13) is proportional to the length of the wide side (14).
6. A low nitrogen burner head according to claim 5, characterized in that: The length of the long side (13) is 1 mm, and the length of the wide side (14) is 0.5 mm.
7. A low nitrogen burner head according to claim 1, characterized in that: The angle (7) is 45°.
8. A low nitrogen burner head according to claim 1, characterized in that: The anti-flashback rings (5) are provided in three groups, and the intervals between two adjacent groups of anti-flashback rings (5) are the same.