CN113375153A - Universal low-nitrogen burner nozzle structure - Google Patents
Universal low-nitrogen burner nozzle structure Download PDFInfo
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- CN113375153A CN113375153A CN202110787447.8A CN202110787447A CN113375153A CN 113375153 A CN113375153 A CN 113375153A CN 202110787447 A CN202110787447 A CN 202110787447A CN 113375153 A CN113375153 A CN 113375153A
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- fuel
- fuel injection
- peripheral
- nozzle structure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/26—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid with provision for a retention flame
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/48—Nozzles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
- F23D14/64—Mixing devices; Mixing tubes with injectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/70—Baffles or like flow-disturbing devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2203/00—Gaseous fuel burners
- F23D2203/007—Mixing tubes, air supply regulation
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention discloses a universal low-nitrogen burner nozzle structure. This shower nozzle structure includes: the fuel gas pipe comprises a main fuel gas pipe, a plurality of peripheral long fuel pipes, a plurality of peripheral short fuel pipes and a central flame stabilizer; the peripheral long fuel pipes and the peripheral short fuel pipes are connected to the main gas pipe and are alternately arranged in the circumferential direction; the end part of the peripheral long fuel pipe is provided with an end part fuel injection hole and an end part fuel injection short rod, and the root part is provided with a root part fuel injection hole and a root part fuel injection short rod; the end part of the peripheral short fuel pipe is provided with an axial fuel injection hole, and the root part of the peripheral short fuel pipe is provided with a circumferential fuel injection hole; the central flame stabilizer is arranged at the end part of the peripheral long fuel pipe, and is provided with a swirl blade, a central hole, a transition flaring and a turbulent flow notch. The nozzle structure of the invention can better organize combustion and control pollutant discharge.
Description
Technical Field
The invention relates to the technical field of combustors, in particular to a universal low-nitrogen combustor nozzle structure.
Background
With the development of society, environmental problems are increasingly prominent, and the international society pays more attention to the influence and consequences caused by environmental pollution. In China, with the development of economic construction, environmental problems caused by the use of a large amount of fossil energy are particularly prominent, so that the environmental protection requirements of the national team are increasingly strict, and the latest atmospheric emission standard reduces the emission of smoke dust concentration, NOx, CO and other pollution gases. Therefore, whether the strict requirements on emissions by national policies or the environmental requirements on energy conservation and emissions caused by the heavy use of various fuel gases are met, the development of a burner with low NOx emission becomes a key factor for solving the contradictions. The design of the low NOx gas burner structure is particularly important for organizing combustion and reducing pollutant emission.
The combustion head of the burner is a key core component of the whole burner, and the function of the component is to mix fuel gas and combustion air and organize the combustion, and release heat for actual needs. The structural form of the component determines the reliability and stability of the combustion process, as well as the velocity and temperature distribution of the entire combustion zone, which are critical factors affecting flue gas emissions.
The combustion mode of the existing combustor is divided into premixed combustion and diffusion combustion. Diffusion combustion is currently used in most of the markets. In order to ensure sufficient combustion, the combustor generally adopts a design mode of better mixing fuel and air, and the combustion in the mode has high flame temperature, large area of a high-temperature area and easy generation of a large amount of NOx. How to design a combustion head which can reduce the oxygen concentration of tail flue gas, further reduce NOx and ensure stable and sufficient combustion is a problem which needs to be solved urgently by research and development technicians at present.
Compared with the prior patent CN108386831A, the burner head structure mostly needs to be designed in a customized manner, matched with a site special hearth structure, or required for the diameters, the lengths and other dimensions of the hearth, so that the low-nitrogen emission standard required by the country or the place can be met.
Thus, there remains a need for a more rational and effective universal low-nitrogen burner tip configuration for organizing combustion and controlling pollutant emissions to enable retrofitting and replacement of existing burner tip configurations.
Disclosure of Invention
The invention mainly aims to provide a universal low-nitrogen burner nozzle structure, which aims to better organize combustion and control pollutant emission, to realize the reconstruction and replacement of the head structure of the existing burner and realize the purpose of reducing nitrogen oxide emission of a common boiler gas burner by replacing local accessories.
In order to achieve the purpose, the invention adopts the following technical scheme:
a universal low-nitrogen burner tip structure, comprising: the fuel gas pipe comprises a main fuel gas pipe, a plurality of peripheral long fuel pipes, a plurality of peripheral short fuel pipes and a central flame stabilizer; the peripheral long fuel pipes and the peripheral short fuel pipes are connected to the main gas pipe and are alternately arranged in the circumferential direction; the end part of the peripheral long fuel pipe is provided with an end part fuel injection hole and an end part fuel injection short rod, and the root part is provided with a root part fuel injection hole and a root part fuel injection short rod; the end part of the peripheral short fuel pipe is provided with an axial fuel injection hole, and the root part of the peripheral short fuel pipe is provided with a circumferential fuel injection hole; the central flame stabilizer is arranged at the end part of the peripheral long fuel pipe, and is provided with a swirl blade, a central hole, a transition flaring and a turbulent flow notch.
When the universal low-nitrogen burner nozzle structure works, air entering a burner is divided into two parts, and one part of air flows through the outer sides of the peripheral long fuel pipes and the peripheral short fuel pipes, is mixed with fuel sprayed by the end fuel spray holes and the circumferential fuel spray holes, and then enters a boiler furnace for combustion; the other part of air flows through the central flame stabilizer, is mixed with the fuel sprayed by the end fuel spray short rod and the axial fuel spray hole, and then rotates under the combined action of the swirl vanes, the central hole and the turbulence notches to be combusted in the boiler hearth; meanwhile, the fuel sprayed from the root fuel injection hole and the root fuel injection short rod is contacted and mixed with the air at the corresponding position, and enters the inner part of the boiler furnace along the outer side of the transition flaring for combustion.
Compared with the prior art, the invention applies the gas staged combustion technology, the internal and external multilayer rotational flow technology and the gas injection flow guiding technology to the structural design of the combustor, and realizes the beneficial effects of:
(1) strengthen the mixture of air and gas, make the mixture more even, improve combustion efficiency, increase boiler thermal efficiency.
(2) The grading of air and fuel is formed, the fuel and the air are mixed for many times in the whole spray head structure to form multi-stage flame, the flame area is divided into a plurality of layers, the temperature field in the hearth is layered, efficient combustion is realized, the flame temperature is reduced, and therefore the emission of nitrogen oxides is greatly reduced.
(3) The central flame stabilizer ensures the stability of flame, thereby ensuring the reliable and stable work of the burner, reducing the danger of backfire and improving the safety of the burner in the use process.
(4) The improvement and the replacement of the head structure of the existing burner can be realized, and the aim of reducing the emission of nitrogen oxides by replacing local accessories of the common boiler gas burner is fulfilled.
Drawings
In order to more clearly illustrate the technical solution of the embodiment of the present invention, the following briefly introduces the embodiment and the drawings used in the description of the prior art.
FIG. 1 is a cross-sectional view of a universal low-nitrogen burner tip configuration provided by an embodiment of the present invention;
FIG. 2 is a front view of a universal low-nitrogen burner nozzle tip configuration provided by an embodiment of the present invention;
FIG. 3 is an isometric view of a generic low-nitrogen burner tip configuration provided by an embodiment of the invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," and the like in the description and in the claims, and in the above-described drawings, are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The following will explain details by way of specific examples.
Referring to fig. 1 to 3, an embodiment of the present invention provides a modified showerhead structure (hereinafter referred to as a showerhead structure) for a general low-nitrogen burner.
The nozzle structure of the embodiment of the invention mainly comprises a main gas pipe 1, a plurality of peripheral long fuel pipes 2, a plurality of peripheral short fuel pipes 3 and a central flame stabilizer 4. Wherein, the peripheral long fuel pipe 2 and the peripheral short fuel pipe 3 are connected to the main gas pipe 1, and the central flame stabilizer 4 is disposed at the end of the peripheral long fuel pipe 2.
The main gas pipe 1 is used for a passage through which gas flows, guides and distributes the gas, so that one part of the gas enters the peripheral long fuel pipe 2, and the other part of the gas enters the peripheral short fuel pipe 3 and finally enters the boiler furnace for combustion. The central flame stabilizer 4 is used for forming a flame stabilization combustion area, adjusting the shape of flame, realizing uniform distribution of high and low temperature areas and finally achieving the purpose of reducing the emission of nitrogen oxides. Optionally, the peripheral long fuel pipe 2 and the peripheral short fuel pipe 3 are detachably connected with the main fuel gas pipe 1, and the end structures of the two pipes are detachable, so that the two pipes can be replaced and adjusted according to different boiler characteristics, and the optimal fuel distribution effect is achieved.
The peripheral long fuel pipes 2 and the peripheral short fuel pipes 3 are alternately arranged in the circumferential direction around the axis of the main fuel gas pipe 1, so that the reasonable distribution of fuel in the inner layer and the outer layer of the nozzle is realized. The front end of the peripheral long fuel pipe 2 is provided with a plurality of end fuel injection holes 5 and end fuel injection short rods 6; the rear section root is arranged with a plurality of root fuel injection holes 8 and root fuel injection stubs 7. The front section end of the peripheral short fuel pipe 3 is provided with a plurality of axial fuel injection holes 9; the aft section root is arranged with a plurality of circumferential fuel injection holes 10.
The central flame stabilizer 4 arranged at the end part of the peripheral long fuel pipe 2 comprises a main structure, and swirl vanes 11, a central hole 12, a transition flaring 13 and a turbulence notch 14 which are arranged on the main structure. Wherein, the centre bore 12 is located central authorities, and a plurality of whirl blades 11 encircle centre bore 12 circumference equipartition, and vortex incision 14 distributes in periphery. Optionally, the transition flaring 13 is a circle of inclined portion formed at the periphery of the main body structure, the outer edge of the transition flaring 13 is in a sawtooth shape, and the notch in the sawtooth shape is the spoiler notch 14. The central flame stabilizer 4 can realize the distribution of an inner layer, a middle layer and an outer layer of gas, wherein the inner layer is non-rotational straight jet flow, the middle layer is strong rotational flow, and the outer layer is disturbance flow. Flow matching between the different layers can be achieved by selection of structural parameters in the central flame holder 4.
When the boiler works, air entering a combustor is divided into two parts, and one part of air flows through the outer sides of the peripheral long fuel pipes 2 and the peripheral short fuel pipes 3, is mixed with fuel sprayed from the end fuel spray holes 5 and the circumferential fuel spray holes 10, and then enters a boiler furnace to be combusted; the other part of air flows through the central flame stabilizer 4, is mixed with the fuel sprayed by the end fuel injection short rod 6 and the axial fuel injection hole 9, and then rotates under the combined action of the swirl vanes 11, the central hole 12 and the turbulence notches 14 to be combusted in the hearth. Meanwhile, the fuel gas sprayed from the root fuel spray hole 8 and the root fuel spray short rod 7 contacts and mixes with the air at the corresponding position, and enters the hearth to be combusted along the outer side of the transition flaring 13. Each combustion area is acted by each stage of airflow to generate mixing effect and shearing effect, and intense substance and heat transfer is carried out to jointly form a stable and efficient combustion area.
As a technical optimization scheme of the invention, the peripheral long fuel pipes 2 and the peripheral short fuel pipes 3 are alternately arranged, and the number of the peripheral long fuel pipes and the peripheral short fuel pipes is 2-4.
As a technical optimization scheme of the invention, the diameters of the end part fuel injection holes 5 and the root part fuel injection holes 8 are 10-25 mm, and the number of the end part fuel injection holes and the root part fuel injection holes is 2-6.
As a technical optimization scheme of the invention, the diameter of the end part fuel injection short rod 6 and the root part fuel injection short rod 7 is 3-15 mm, and the number of the end part fuel injection short rods is 1-3.
As a technical optimization scheme of the invention, the number of the swirl vanes 11 is 6-10.
As a technical optimization scheme of the invention, the rotational flow angle of the rotational flow blade 11 is 25-60 degrees.
As a technical optimization scheme of the invention, the diameter of the central hole 12 is 30-45 mm.
As a technical optimization scheme of the invention, the angle of the transition flaring 13 is 15-30 degrees.
As a technical optimization scheme of the invention, the length of the transition flaring 13 is 20-35 mm.
In summary, the embodiment of the invention discloses a universal low-nitrogen burner nozzle structure. The invention applies the gas staged combustion technology, the internal and external multilayer rotational flow technology and the gas injection flow guiding technology to the structural design of the combustor, and realizes the following beneficial effects:
(1) strengthen the mixture of air and gas, make the mixture more even, improve combustion efficiency, increase boiler thermal efficiency.
(2) The grading of air and fuel is formed, the fuel and the air are mixed for many times in the whole spray head structure to form multi-stage flame, the flame area is divided into a plurality of layers, the temperature field in the hearth is layered, efficient combustion is realized, the flame temperature is reduced, and therefore the emission of nitrogen oxides is greatly reduced.
(3) The central flame stabilizer ensures the stability of flame, thereby ensuring the reliable and stable work of the burner, reducing the danger of backfire and improving the safety of the burner in the use process.
(4) The improvement and the replacement of the head structure of the existing burner can be realized, and the aim of reducing the emission of nitrogen oxides by replacing local accessories of the common boiler gas burner is fulfilled.
The technical solution of the present invention is explained in detail by the specific embodiments above. In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.
It should be understood that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same. The technical solutions described in the above embodiments can be modified or part of the technical features can be equivalently replaced by those skilled in the art; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit and the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A universal low-nitrogen burner nozzle structure, comprising:
the fuel gas burner comprises a main fuel gas pipe (1), a plurality of peripheral long fuel pipes (2), a plurality of peripheral short fuel pipes (3) and a central flame stabilizer (4);
the peripheral long fuel pipes (2) and the peripheral short fuel pipes (3) are connected to the main gas pipe (1) and are alternately arranged in the circumferential direction;
the end part of the peripheral long fuel pipe (2) is provided with an end part fuel injection hole (5) and an end part fuel injection short rod (6), and the root part is provided with a root part fuel injection hole (8) and a root part fuel injection short rod (7);
the end part of the peripheral short fuel pipe (3) is provided with an axial fuel injection hole (9), and the root part is provided with a circumferential fuel injection hole (10);
the central flame stabilizer (4) is arranged at the end part of the peripheral long fuel pipe (2), and the central flame stabilizer (4) is provided with swirl vanes (11), a central hole (12), transition flaring openings (13) and turbulent flow notches (14).
2. The universal low-nitrogen burner nozzle structure according to claim 1,
when the boiler works, air entering a combustor is divided into two parts, and one part of air flows through the outer sides of the peripheral long fuel pipes (2) and the peripheral short fuel pipes (3) and is mixed with fuel sprayed from the end fuel spray holes (5) and the circumferential fuel spray holes (10) and then enters a boiler furnace to be combusted; the other part of air flows through the central flame stabilizer (4), is mixed with the fuel sprayed by the end fuel injection short rod (6) and the axial fuel injection hole (9), and then rotates under the combined action of the swirl vanes (11), the central hole (12) and the turbulence notches (14) to be combusted in the boiler furnace; meanwhile, the fuel sprayed from the root fuel spray hole (8) and the root fuel spray short rod (7) is contacted and mixed with the air at the corresponding position, and enters the inner part of the boiler furnace along the outer side of the transition flaring (13) for combustion.
3. The universal low-nitrogen burner nozzle structure according to claim 1,
the peripheral long fuel pipe (2) and the peripheral short fuel pipe (3) are detachably connected with the main fuel gas pipe (1).
4. The universal low-nitrogen burner nozzle structure according to claim 1,
on central flame holder (4), centre bore (12) are located central authorities, and are a plurality of whirl blade (11) encircle centre bore (12) circumference equipartition, vortex incision (14) distribute in periphery.
5. The universal low-nitrogen burner nozzle structure according to claim 1,
the number of the peripheral long fuel pipes (2) and the number of the peripheral short fuel pipes (3) are 2-4.
6. The universal low-nitrogen burner nozzle structure according to claim 1,
the diameters of the end part fuel injection holes (5) and the root part fuel injection holes (8) are 10-25 mm, and the number of the end part fuel injection holes and the root part fuel injection holes is 2-6.
7. The universal low-nitrogen burner nozzle structure according to claim 1,
the diameter of the end part fuel injection short rod (6) and the root part fuel injection short rod (7) is 3-15 mm, and the number of the end part fuel injection short rods is 1-3.
8. The universal low-nitrogen burner nozzle structure according to claim 1,
the number of the swirl blades (11) is 6-10, and the swirl angle is 25-60 degrees.
9. The universal low-nitrogen burner nozzle structure according to claim 1,
the diameter of the central hole (12) is 30-45 mm.
10. The universal low-nitrogen burner nozzle structure according to claim 1,
the angle of the transition flaring (13) is 15-30 degrees, and the length is 20-35 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110787447.8A CN113375153A (en) | 2021-07-13 | 2021-07-13 | Universal low-nitrogen burner nozzle structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110787447.8A CN113375153A (en) | 2021-07-13 | 2021-07-13 | Universal low-nitrogen burner nozzle structure |
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| Publication Number | Publication Date |
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| CN113375153A true CN113375153A (en) | 2021-09-10 |
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| CN202110787447.8A Pending CN113375153A (en) | 2021-07-13 | 2021-07-13 | Universal low-nitrogen burner nozzle structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113739149A (en) * | 2021-09-17 | 2021-12-03 | 中国计量大学 | Low-nitrogen combustor |
| CN114688559A (en) * | 2022-02-17 | 2022-07-01 | 中国航发沈阳发动机研究所 | High-efficiency mixing head structure of low-emission hydrogen fuel combustion chamber |
-
2021
- 2021-07-13 CN CN202110787447.8A patent/CN113375153A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113739149A (en) * | 2021-09-17 | 2021-12-03 | 中国计量大学 | Low-nitrogen combustor |
| CN114688559A (en) * | 2022-02-17 | 2022-07-01 | 中国航发沈阳发动机研究所 | High-efficiency mixing head structure of low-emission hydrogen fuel combustion chamber |
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