Combustion head of combustor

Abstract

The utility model relates to the technical field of combustors, in particular to a combustion head of a combustor, which comprises a mounting seat, a gas pipe and an outer shell, an air inlet is formed in the end part of the mounting seat, one end of the gas pipe is arranged in the mounting seat, the other end of the gas pipe is arranged in the outer shell, and a gas inlet pipe is radially arranged on one side, in the mounting seat, of the gas pipe; the gas pipe is provided with a rotational flow disc at the end of the outer shell, circulating cylinders are arranged at the end, away from the mounting base, of the outer shell at intervals, the circulating cylinders and the outer shell are fixed through a plurality of connecting ribs, a grading cylinder is arranged on the outer side wall of the rotational flow disc, and a circulating flow channel is formed between the grading cylinder and the circulating cylinder. And through the arrangement of the rotational flow disc, fuel gas and air can be fully mixed, so that the combustion full degree of the fuel gas is improved. Meanwhile, due to the arrangement of the circulating flow channel, flue gas in the boiler can pass through the circulating flow channel to form flue gas circulating combustion, rich-lean combustion is formed, and a remarkable inhibition effect is formed on production of nitric oxide.

Description

Technical Field

[0001] The present application relates to the technical field of burners, and in particular to a combustion head of a burner. Background Art

[0002] Burner is a general term for devices that spray fuel and air in a certain way for mixed combustion. It is commonly used in heat treatment fields such as boilers, smelting furnaces, and melting furnaces.

[0003] For burners, nitrogen oxide emissions are an important indicator of the environment, and their emission standards must be lower than 50mg / m 3 The FGR burner is a type of ultra-low nitrogen burner. During operation, it extracts a portion of low-temperature flue gas from the flue of the boiler, mixes it with the combustion-supporting air, and then sends it into the furnace. This is a flue gas external circulation technology achieved by installing FGR pipelines.

[0004] Regarding the above-mentioned technologies, once the FGR pipeline is removed, the nitrogen oxide emissions will generally exceed 50mg / m 3 The present application aims to provide a combustion head without an FGR duct and having a lower nitrogen oxide emission of the burner. Utility Model Content

[0005] In order to eliminate the FGR pipeline and lower the nitrogen oxide emission standard of the burner, the present application provides a combustion head of the burner.

[0006] The combustion head of a burner provided in this application adopts the following technical solution:

[0007] A combustion head of a burner comprises a mounting seat, a gas pipe and an outer shell, an air inlet is arranged at the end of the mounting seat, one end of the gas pipe is arranged in the mounting seat, and the other end is arranged in the outer shell, an air inlet pipe is radially arranged on one side of the gas pipe in the mounting seat, a swirl disk is arranged at the end of the gas pipe in the outer shell, a circulation cylinder is arranged at intervals at the end of the outer shell away from the mounting seat, the circulation cylinder and the outer shell are fixed by a plurality of connecting ribs, a grading cylinder is arranged on the outer side wall of the swirl disk, and a circulation flow channel is formed between the grading cylinder and the circulation cylinder.

[0008] By adopting the above technical solution, the swirl disk is set to fully mix the gas and air to improve the combustion degree of the gas. At the same time, the circulating flow channel is set to allow the flue gas in the boiler to form a flue gas circulation combustion through the circulating flow channel and form a concentrated and thin combustion, which has a significant inhibitory effect on the production of nitrogen oxides.

[0009] Optionally, the gas pipe includes a main pipe that is interconnected and a number of branch pipes that are evenly distributed along the circumference of the main pipe, and the several branch pipes include a curved portion connected to the main pipe and an extended portion parallel to the main pipe. The end of the outer shell is tapered to form an inclined surface, and the several branch pipes extend to the outside of the inclined surface.

[0010] By adopting the above technical solution, the inclined surface is set to guide the airflow so that the airflow will not be blown out from the gap at the connecting rib, which is conducive to the formation of flue gas circulation combustion. At the same time, the setting of the inclined surface provides an installation basis for several sleeves.

[0011] Optionally, a plurality of sleeves corresponding to the number and position of the branch pipes are arranged on the inclined surface, the sleeves are connected to the inside of the outer shell, and the inner diameter of the sleeves is larger than the diameter of the branch pipes.

[0012] By adopting the above technical solution, the airflow can directly pass through the sleeve, thereby driving the gas to be blown out faster, thereby reducing the required gas pressure and improving safety.

[0013] Optionally, the end of the branch pipe is located inside the sleeve.

[0014] By adopting the above technical solution, the end of the branch pipe is located in the sleeve, so that a gap is formed between the end of the branch pipe and the end of the sleeve, and air and gas can be pre-mixed in the gap to improve the combustion completeness of the gas.

[0015] Optionally, the end of the circulation cylinder facing away from the outer shell is expanded in a trumpet-shaped manner.

[0016] By adopting the above technical solution and setting the bell mouth, it is more conducive to forming staged combustion.

[0017] Optionally, the gas pipe includes a main pipe connected to the air intake pipe, an air intake rod is axially arranged inside the main pipe, both ends of the air intake rod are opened, and the side wall of the main pipe is connected to a plurality of branch pipes, and the end of the main pipe away from the air inlet is axially provided with a main pipe connected to one end of the air intake rod, and the side wall of the air intake rod facing the air intake pipe is penetrated by an air intake hole, and an air intake adjusting rod is rotatably connected inside the air intake rod, one end of the air intake adjusting rod closes the opening of the air intake rod on the side away from the main pipe, and the side wall of the air intake adjusting rod is provided with an air intake adjusting hole, and rotating the air intake adjusting rod can control the air intake adjusting hole and the air intake hole to be relative or staggered.

[0018] By adopting the above technical solution, the relative angle between the air intake adjustment hole and the air intake hole is controlled by rotating the air intake adjustment rod, so that the air intake amount can be directly controlled.

[0019] Optionally, the side wall of the swirl disk is evenly distributed with inclined grooves in the circumferential direction, and the swirl disk is arranged in the shape of a turbine disk.

[0020] By adopting the above technical solution, air and gas can be quickly mixed and blown out.

[0021] Optionally, a spoiler block is axially arranged on one side of the swirl disk facing the gas pipe, and a gap is left between the spoiler block and the end of the gas pipe.

[0022] By adopting the above technical solution, the gas blown out of the gas pipe can be quickly dispersed to the surroundings through the spoiler block, so as to improve the mixing degree of air and gas.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The swirl disc is set up to fully mix the gas and air to improve the degree of gas combustion. At the same time, the circulating flow channel is set up to allow the flue gas in the boiler to form a flue gas circulation combustion through the circulating flow channel and form a concentrated and thin combustion, which has a significant inhibitory effect on the production of nitrogen oxides;

[0025] 2. The coordinated arrangement of the sleeve and the branch pipe allows the airflow to pass directly through the sleeve, thereby driving the gas to be blown out faster, so as to reduce the required gas pressure and improve safety. At the same time, the end of the branch pipe is located in the sleeve, so that a gap is formed between the end of the branch pipe and the end of the sleeve. The air and gas can be pre-mixed in the gap to improve the degree of combustion of the gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0027] Figure 2 It is an exploded view of an embodiment of the present application.

[0028] Figure 3 yes Figure 1 Section view of the AA plane.

[0029] Explanation of the reference numerals in the accompanying drawings: 1. mounting seat; 2. air inlet; 3. air inlet; 4. outer shell; 5. gas pipe; 51. main pipe; 52. air inlet pipe; 53. air inlet rod; 54. main pipe; 55. air inlet adjustment rod; 56. adjustment member; 57. branch pipe; 571. bending portion; 572. extension portion; 6. air inlet hole; 7. air inlet adjustment hole; 8. inclined surface; 9. sleeve; 10. flange; 11. swirl disk; 12. spoiler block; 13. bump; 14. grading cylinder; 15. connecting rib; 16. circulation cylinder; 17. circulation flow channel. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-3 This application is described in further detail.

[0031] The embodiment of the present application discloses a combustion head of a burner. Figure 1 , Figure 2 The burner head includes a mounting base 1 with openings at both ends. One end of the mounting base 1 is provided with an air inlet 2 and the other end is fixedly connected to an outer shell 4. A gas pipe 5 is also fixedly connected to the mounting base 1. One end of the gas pipe 5 is located in the mounting base 1 and the other end extends into the outer shell 4.

[0032] Reference Figure 2 , Figure 3 The gas pipe 5 includes a main pipe 51, and the side wall of the main pipe 51 is radially connected with an air intake pipe 52, and the air intake pipe 52 is fixedly connected to the inside of the mounting seat 1, and the side wall of the mounting seat 1 is provided with an air intake port 3 connected to the air intake pipe 52. An air intake rod 53 is axially welded inside the main pipe 51, and both ends of the air intake rod 53 are opened on the side wall of the main pipe 51. A main pipe 54 is welded to the side wall of the main pipe 51 away from the air inlet 2, and the main pipe 54 is axially arranged with the air intake rod 53 and connected with one end opening thereof.

[0033] Reference Figure 2 , Figure 3 The side wall of the air intake rod 53 facing the air intake pipe 52 is penetrated with an air intake hole 6, and an air intake adjustment rod 55 is rotatably connected inside the air intake rod 53. One end of the air intake adjustment rod 55 is fixedly connected with an adjustment member 56, which closes the opening of the air intake rod 53 on the side away from the main pipeline 54 and is used to control the rotation of the air intake adjustment rod 55. The side wall of the air intake adjustment rod 55 is penetrated with an air intake adjustment hole 7, and the air intake adjustment hole 7 and the air intake hole 6 can be made to be opposite or staggered by rotating the air intake adjustment rod 55, thereby controlling the air intake amount of the fuel gas.

[0034] Reference Figure 2 , Figure 3 The side wall of the main pipe 51 is fixedly connected with four branch pipes 57 evenly arranged along the axial direction thereof, and the branch pipes 57 include a curved portion 571 connected to the main pipe 51 and an extended portion 572 parallel to the main pipe 54. In other embodiments, the branch pipes 57 may be provided in six or other quantities, which may be adjusted according to the size of the burner head.

[0035] Reference Figure 2 , Figure 3The end of the outer shell 4 away from the mounting seat 1 is configured to be constricted and formed with an inclined surface 8, and the end of the inclined surface 8 away from the mounting seat 1 is fixedly connected to four sleeves 9, the position and number of the sleeves 9 correspond to the branch pipes 57, and the sleeves 9 are connected to the inside of the outer shell 4, and the four branch pipes 57 are respectively inserted into the corresponding sleeves 9. Among them, the inner diameter of the sleeve 9 is larger than the inner diameter of the branch pipe 57, and the end of the branch pipe 57 is located in the sleeve 9 so that a gap is left between the end of the branch pipe 57 and the end of the sleeve 9.

[0036] Reference Figure 2 , Figure 3 The end of the main pipe 54 is fixedly connected with a flange 10, and the end of the main pipe 54 is fixedly connected with a swirl disc 11 through the flange 10. The side wall of the swirl disc 11 is evenly provided with inclined grooves in the circumferential direction, so that the swirl disc 11 is arranged in the shape of a turbine disc. The swirl disc 11 is integrally connected with a spoiler 12 in the axial direction of the side wall facing the flange 10, and the spoiler 12 is integrally connected with a plurality of protrusions 13 on the side facing the flange 10. The protrusions 13 are arranged so that a gap is left between the spoiler 12 and the end of the main pipe 54.

[0037] Reference Figure 2 , Figure 3 The side wall of the swirl disc 11 is fixedly connected with a classification cylinder 14 axially arranged with the main pipeline 54, and a gap is left between the swirl disc 11 and the end of the classification cylinder 14 away from the outer shell 4. A plurality of connecting ribs 15 are welded on the inclined surface 8 of the outer shell 4, and a circulation cylinder 16 axially arranged with the classification cylinder 14 is welded on the plurality of connecting ribs 15. A circulation flow channel 17 is formed between the classification cylinder 14 and the circulation cylinder 16, and the flue gas in the boiler can be sucked into the combustion head from between the plurality of connecting ribs 15 and burned again. Among them, the end of the circulation cylinder 16 away from the outer shell 4 is expanded in a trumpet shape.

[0038] The implementation principle of the combustion head of a burner in an embodiment of the present application is as follows: air and gas are introduced into the air inlet 2 and the air inlet 3 respectively, the gas enters the main pipe 51 through the air inlet pipe 52 and passes into each branch pipe 57, and the gas in the main pipe 51 enters the air inlet rod 53 and the main pipe 54 through the air inlet hole 6 and the air inlet adjustment hole 7.

[0039] The gas entering the main pipeline 54 is dispersed to the surroundings when it is transported to the spoiler block 12. At the same time, under the action of wind, the gas and air are quickly mixed through the swirl disk 11 and blown out. Before being blown out, the air and gas are further fully mixed in the gap between the swirl disk 11 and the end of the classifying cylinder 14 to ensure sufficient combustion.

[0040] At the same time, due to the setting of the inclined surface 8 at the end of the outer shell 4, combined with the gap formed by the outer shell 4 and the circulation cylinder 16 through a number of connecting ribs 15, the flue gas in the boiler will be sucked into the circulation flow channel 17 by the negative pressure generated by the airflow, so that the flue gas is further completely burned and forms a rich and thin combustion with the fuel gas in the main pipeline 54, thereby achieving the purpose of suppressing the generation of nitrogen oxides during the combustion process.

[0041] In addition, the gas in the branch pipe 57 is transported to the corresponding sleeve 9, and the gas and air are mixed and blown out at the end of the sleeve 9 under the action of wind, and the gap formed between the end of the sleeve 9 and the end of the branch pipe 57 also allows the air and gas to be further fully mixed. At the same time, the arrangement of the main pipe 54 and the branch pipe 57 forms staged combustion, which further suppresses the generation of nitrogen oxides.

[0042] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A burner head of a burner, comprising a mounting seat (1), a gas pipe (5), and an outer shell (4), wherein an air inlet (2) is arranged at the end of the mounting seat (1), one end of the gas pipe (5) is arranged in the mounting seat (1), and the other end is arranged in the outer shell (4), and an air inlet pipe (52) is radially arranged on one side of the gas pipe (5) in the mounting seat (1), characterized in that: The gas pipe (5) is provided with a swirl disk (11) at the end of the outer shell (4); a circulation cylinder (16) is provided at intervals at the end of the outer shell (4) away from the mounting seat (1); the circulation cylinder (16) and the outer shell (4) are fixed to each other via a plurality of connecting ribs (15); a grading cylinder (14) is provided on the outer side wall of the swirl disk (11); a circulation channel (17) is formed between the grading cylinder (14) and the circulation cylinder (16).

2. The combustion head of a burner according to claim 1, characterized in that: The gas pipe (5) comprises a main pipe (54) that is interconnected and a plurality of branch pipes (57) that are evenly distributed along the circumference of the main pipe (54); the plurality of branch pipes (57) comprise a bent portion (571) connected to the main pipe (54) and an extended portion (572) parallel to the main pipe (54); the end of the outer shell (4) is provided with an inclined surface (8) in a constricted manner, and the plurality of branch pipes (57) penetrate to the outside of the inclined surface (8).

3. The combustion head of a burner according to claim 2, characterized in that: The inclined surface (8) is provided with a plurality of sleeves (9) corresponding in number and position to the branch pipes (57); the sleeves (9) are connected to the interior of the outer shell (4); and the inner diameter of the sleeves (9) is greater than the diameter of the branch pipes (57).

4. The combustion head of a burner according to claim 3, characterized in that: The end of the branch pipe (57) is located inside the sleeve (9).

5. The combustion head of a burner according to claim 1, characterized in that: The end of the circulation cylinder (16) facing away from the outer shell (4) is arranged to be expanded in a trumpet-shaped manner.

6. The combustion head of a burner according to claim 1, characterized in that: The gas pipe (5) comprises a main pipe (51) connected to an air intake pipe (52), an air intake rod (53) is axially arranged inside the main pipe (51), both ends of the air intake rod (53) are arranged to be open, a plurality of branch pipes (57) are connected to the side wall of the main pipe (51), a main pipe (54) connected to one end of the air intake rod (53) is axially arranged at one end of the main pipe (51) away from the air inlet (2), and the air intake rod (53) is provided with a main pipe (54) connected to one end of the air intake rod (53). ) is penetrated by a side wall toward the air inlet pipe (52), an air inlet hole (6) is rotatably connected to the air inlet rod (53), one end of the air inlet regulating rod (55) closes the opening of the air inlet rod (53) on the side away from the main pipe (54), and an air inlet regulating hole (7) is provided on the side wall of the air inlet regulating rod (55), and the air inlet regulating hole (7) and the air inlet hole (6) can be controlled to be relative or staggered by rotating the air inlet regulating rod (55).

7. The combustion head of a burner according to claim 1, characterized in that: The side wall of the swirl disk (11) is evenly distributed with oblique grooves in the circumferential direction, and the swirl disk (11) is arranged in the shape of a turbine disk.

8. The combustion head of a burner according to claim 1, characterized in that: A spoiler block (12) is axially arranged on one side of the swirl disk (11) facing the gas pipe (5), and a gap is left between the spoiler block (12) and the end of the gas pipe (5).

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