CN112066371B - Hydrogen mixes low NOx burner in advance based on flame on duty - Google Patents
Hydrogen mixes low NOx burner in advance based on flame on duty Download PDFInfo
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- CN112066371B CN112066371B CN202010910660.9A CN202010910660A CN112066371B CN 112066371 B CN112066371 B CN 112066371B CN 202010910660 A CN202010910660 A CN 202010910660A CN 112066371 B CN112066371 B CN 112066371B
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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
- F23D14/46—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
- F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
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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
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L5/00—Blast-producing apparatus before the fire
- F23L5/02—Arrangements of fans or blowers
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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
A hydrogen premixing low-nitrogen burner based on-duty flame comprises a combustion cavity, a combustion nozzle, a fan supporting frame and a fan, wherein the combustion nozzle is positioned on the plane of an inlet of the combustion cavity, the fan supporting frame is connected with the combustion cavity, the fan is arranged at the bottom of the fan supporting frame, the combustion nozzle consists of an on-duty combustion nozzle positioned in the center and four main combustion nozzles symmetrically distributed around the on-duty combustion nozzle, the on-duty combustion nozzle comprises a center fuel spray hole and an axial reverse double-swirl vane, and fuel is natural gas/air mixed gas and is used for providing stable combustion on-duty flame; the tail part of the main combustion nozzle is open, the side wall of the main combustion nozzle is provided with a fuel spray hole, the middle part of the main combustion nozzle is a Venturi mixing section, the outlet of the Venturi mixing section is provided with a quenching hole rectifying plate, and the front part of the main combustion nozzle is provided with a low swirl vane with an axis spray hole, so that reliable and sufficient mixing can be realized, meanwhile, hydrogen can be prevented from tempering and blowing out, and stable hydrogen lifting flame is formed. The invention can realize stable and reliable premixed combustion of hydrogen, reduce the emission of nitrogen oxides and ensure that the combustion process is cleaner and more stable.
Description
Technical Field
The invention belongs to the technical field of thermal energy engineering, relates to a burner, and particularly relates to a hydrogen premixing low-nitrogen burner based on-duty flame.
Background
With the increasingly strict global requirements on carbon emission reduction, renewable energy sources such as solar energy, wind energy and the like are rapidly developed, and the fluctuation of the renewable energy sources causes serious threats to the safety of a power grid, and brings about serious wind and light abandoning phenomena. The hydrogen is an excellent energy carrier, and the conversion of fluctuating electric energy into hydrogen energy for storage is a feasible energy storage and distributed utilization mode. Hydrogen is a carbon-free clean fuel, and the large-scale application of hydrogen in combustion will be an important trend in the development of future energy fields. The combustion speed of hydrogen is fast, and is limited by the tempering problem in the combustion process, so the non-premixed combustion mode is mostly used for hydrogen combustion at present. However, since hydrogen has a high adiabatic combustion temperature, non-premixed combustion can result in a combustion zone with a high temperature, thereby generating more nitrogen oxides. The lean-burn premixed combustion technology is beneficial to reducing the emission of nitrogen oxides, but the problems of insufficient mixing, easy tempering, easy blow-out of lean-burn and the like of hydrogen during lean-burn premixing are difficult to solve. In addition, because the hydrogen combustion rate is high, the flame combustion position is close to the nozzle, and the combustion mode has the risk of nozzle ablation. Therefore, the combustor needs to be designed reasonably to realize reliable and stable combustion of hydrogen under the condition of premixed lean combustion.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a hydrogen premixing low-nitrogen burner based on-duty flame, which uses the technologies of the on-duty flame, a low rotational flow structure, a Venturi mixing section and the like to realize reliable and stable combustion of hydrogen under the condition of premixing lean combustion, thereby reducing the emission of nitrogen oxides in the combustion process of the hydrogen and realizing clean and efficient combustion of the hydrogen.
In order to achieve the purpose, the invention adopts the technical scheme that:
a hydrogen premixing low-nitrogen burner based on-duty flame comprises a combustion cavity 1, a combustion nozzle, a fan supporting frame 6 and a fan 7, wherein the combustion nozzle is located on the plane of an inlet of the combustion cavity 1, the fan supporting frame 6 is connected with the combustion cavity 1, the fan 7 is arranged at the bottom of the fan supporting frame 6, the combustion nozzle consists of an on-duty combustion nozzle located in the center and four main combustion nozzles symmetrically distributed around the on-duty combustion nozzle, the on-duty combustion nozzle comprises a central fuel spray hole 9, the central fuel spray hole 9 is connected with a central on-duty combustion nozzle fuel pipeline 11, and axial reverse double-swirl vanes 8 are arranged on the circumferential periphery of the central fuel spray hole 9; the tail of the main combustion nozzle is open, the side wall of the main combustion nozzle is provided with a fuel spray hole 5 connected with a fuel pipeline 10 of the main combustion nozzle, the middle of the main combustion nozzle is a Venturi mixing section 4, the outlet of the Venturi mixing section 4 is provided with a quenching hole rectifying plate 3, and the front part of the main combustion nozzle is a low swirl vane 2 with an axis spray hole.
The axial reverse double swirl vanes 8 are positioned below the inlet plane and are composed of two layers of swirl vanes which are axially overlapped and arranged and have opposite rotating directions, and the rotating angles of the two layers of swirl vanes are 0-40 degrees. The nozzle of the central fuel spray hole 9 is arranged in the swirling area of the bottom swirling vane.
The tail part of the main combustion nozzle is in a wide mouth shape, the connecting part of the main combustion nozzle and the Venturi mixing section 4 in the middle part is a throat with the inner diameter being reduced, a plurality of fuel spray holes 5 are uniformly arranged at the side wall of the throat, the spraying direction is radial, the front part of the main combustion nozzle is in a columnar space, and the quenching hole rectifying plate 3 and the low swirl vanes 2 are respectively positioned at the tail end and the front end of the columnar space.
The quenching hole rectifying plate 3 is a flat plate with a through hole, and the aperture of the through hole is the quenching size of combustion.
The low swirl vanes 2 are a group of vanes which rotate clockwise or anticlockwise by 0-40 degrees.
The fuel in the main combustion nozzle fuel line 10 is pure hydrogen; the fuel in the central on-duty combustion nozzle fuel line 11 is natural gas or a mixture of natural gas and air.
Compared with the prior art, the burner has high combustion efficiency and low emission of nitrogen oxides. After the combustor is adopted, stable and reliable premixed combustion of hydrogen can be realized, the hydrogen and air are reliably mixed, and the probability of tempering and blow-out in the combustion process is reduced.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
FIG. 2 is a schematic view of the main combustion nozzle configuration of the present invention.
FIG. 3 is a schematic view of a combustion nozzle on duty according to the present invention.
FIG. 4 is a schematic view of the structure of the axial reverse double swirl vane of the present invention.
Wherein, 1-a combustion chamber; 2-low swirl vanes; 3-quenching a hole rectifying plate; 4-a venturi mixing section; 5-fuel injection holes; 6-a fan supporting frame; 7-a fan; 8-axial reverse double swirl vanes; 9-center fuel nozzle hole; 10-main combustion nozzle fuel line; 11-center on-duty combustion nozzle fuel line.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples.
As shown in FIG. 1, the invention relates to a hydrogen premixing low-nitrogen burner based on-duty flame, which aims to greatly reduce the emission of nitrogen oxides in the hydrogen combustion process by using a combustion organization mode of lean burn premixing. It comprises a combustion chamber 1, the combustion chamber 1 is located at the top end of the whole burner to enclose the whole combustion area to provide heat and energy. A fan supporting frame 6 is arranged at the middle lower part of the combustor, and a fan 7 is arranged at the bottom of the fan supporting frame 6 and is arranged at the upstream of the combustor (the upstream is defined as the tail part in the invention, and the same is true below) along the axial direction to provide fresh air for the whole combustion process. According to the invention, 5 combustion nozzles are arranged on the plane of the inlet of the combustion chamber 1, all the combustion nozzles are fixed on the fan supporting frame 6 and are respectively an on-duty combustion nozzle positioned in the center of the combustion chamber 1 and four main combustion nozzles symmetrically distributed around the on-duty combustion nozzle, namely, the problem of hydrogen blowout possibly occurring under the extremely lean combustion condition of hydrogen is solved by arranging on-duty flame, stable and reliable premixed combustion of the hydrogen can be realized, the emission of nitrogen oxides is reduced, and the combustion process is cleaner and more stable.
As shown in FIGS. 1 and 2, the main combustion nozzle is mainly composed of low swirl vanes 2, a quench hole fairing plate 3, a venturi mixing section 4, fuel injection holes 5, and a main combustion nozzle fuel line 10, and may also include other necessary mounting and support structures known in the art, and the fuel in the main combustion nozzle fuel line 10 is high purity hydrogen.
Specifically, the main combustion nozzle has an axial direction parallel to the axial direction of the combustion chamber 1, and its inner space is approximately: the tail part is in an open wide mouth shape, the middle part is a Venturi mixing section 4, the front part is in a column shape, the connecting part of the front part and the middle Venturi mixing section 4 is a throat with the inner diameter being reduced, a plurality of fuel spray holes 5 are uniformly arranged on the side wall of the throat and are connected with a main combustion nozzle fuel pipeline 10, the spray direction is radial and is vertical to the flow direction of fresh air. The quenching hole rectifying plate 3 is arranged at the outlet of the Venturi mixing section 4, namely is positioned at the tail end of the front cylindrical space, the quenching hole rectifying plate 3 is a flat plate with a through hole, the aperture of the through hole is the quenching size of combustion, and the possible problems of tempering and blow-out in the hydrogen premixed combustion can be prevented. The structure matching design of the venturi mixing section 4, the fuel spray holes 5 and the quenching hole rectifying plate 3 can realize reliable and sufficient mixing of hydrogen and air under the lean burn condition. The low swirl vane 2 is positioned at the front end of the front cylindrical space, and the axis of the low swirl vane is of a hole structure, namely a nozzle of the main combustion nozzle. The low swirl vanes 2 are a group of vanes which rotate clockwise or anticlockwise by 0-40 degrees, so that the hydrogen premixed flame can be stably lifted, and the ablation of the main combustion nozzle is prevented, namely, after the high-purity hydrogen is fully premixed with air, the stable low swirl lifted flame is formed above the main combustion nozzle through the low swirl vanes 2.
As shown in fig. 1 and 3, the on-duty combustion nozzle mainly comprises an axial reverse double-swirl vane 8, a central fuel spray hole 9 and a central on-duty combustion nozzle fuel pipeline 11, and may also include other necessary installation and support structures known in the art, wherein the central fuel spray hole 9 is located at the central position of the combustion chamber 1, and is a group of axially distributed spray holes connected with the central on-duty combustion nozzle fuel pipeline 11, and the spray direction of the fuel is opposite to the air inlet direction. Axially reversed double swirl vanes 8 are arranged circumferentially around the central fuel nozzle hole 9. The fuel in the central on-duty combustion nozzle fuel line 11 is natural gas or a mixture of natural gas and air to provide a stable burning on-duty flame.
As shown in fig. 4, the axially reversed double swirl vanes 8 are located below the inlet plane and are composed of two layers of swirl vanes with opposite rotation directions, which are axially overlapped, the rotation angles of the two layers of swirl vanes are both 0-40 degrees, and the nozzle of the central fuel nozzle 9 is located in the swirl area of the bottom layer swirl vane. The on-duty combustor utilizes the axial reverse double-swirl blades 8 and the central fuel spray holes 9 to realize the full mixing of natural gas/air, and the lean burn premixed combustion organization mode is used for greatly reducing the emission of nitrogen oxides in the hydrogen combustion process.
According to the structure, the working process and the principle of the invention are as follows:
the fan 7 is started and natural gas is introduced into the on-duty combustion nozzle, the natural gas is fully mixed with fresh air through the axial reverse double-swirl vanes 8 after being sprayed out of the central fuel spray hole 9, and the mixed gas is ignited in the combustion chamber 1 to form stable on-duty flame. The main combustion nozzle fuel line is then fed with hydrogen and ejected from the fuel orifices 5 to mix with upstream fresh air in the venturi mixing section 4. Then the mixed gas is further mixed through the quenching hole rectifying plate 3, and a certain rotational flow strength is obtained under the action of the low rotational flow blades 2. Finally, the hydrogen/air mixture is ignited by the on-duty flame in the combustion chamber 1, which is stabilized above the nozzles by the swirl flow.
The above description is only for the preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention and the inventive concept within the scope of the present invention, which is disclosed by the present invention, and the equivalent or change thereof belongs to the protection scope of the present invention.
Claims (6)
1. A hydrogen premixing low-nitrogen combustor based on-duty flame comprises a combustion chamber (1), a combustion nozzle, a fan supporting frame (6) and a fan (7), wherein the combustion nozzle is located on an inlet plane of the combustion chamber (1), the fan supporting frame (6) is connected with the combustion chamber (1), the fan (7) is arranged at the bottom of the fan supporting frame (6), the combustion nozzle is characterized by comprising an on-duty combustion nozzle located in the center and four main combustion nozzles symmetrically distributed around the on-duty combustion nozzle, the on-duty combustion nozzle comprises a central fuel spray hole (9), the central fuel spray hole (9) is connected with a fuel pipeline (11) of the central on-duty combustion nozzle, and axial reverse double-swirl vanes (8) are arranged on the circumferential periphery of the central fuel spray hole (9); the tail part of the main combustion nozzle is open, the side wall of the main combustion nozzle is provided with a fuel spray hole (5) connected with a main combustion nozzle fuel pipeline (10), the middle part of the main combustion nozzle is a Venturi mixing section (4), the outlet of the Venturi mixing section (4) is provided with a quenching hole rectifying plate (3), the front part of the main combustion nozzle fuel pipeline is provided with a low swirl vane (2) with an axis spray hole, and the fuel in the main combustion nozzle fuel pipeline (10) is pure hydrogen; the fuel in the fuel line (11) of the central on-duty combustion nozzle is natural gas or a mixture of natural gas and air.
2. The on-duty flame-based hydrogen premixing low-nitrogen burner as claimed in claim 1, wherein the axial reverse double swirl vanes (8) are located below the inlet plane and are composed of two layers of swirl vanes with opposite rotation directions and installed in an axially overlapped mode, and the nozzle of the central fuel nozzle (9) is arranged in the swirl area of the bottom layer swirl vanes.
3. The on-duty flame-based hydrogen premixing low-nitrogen burner of claim 2, wherein the rotation angles of the two layers of the swirl vanes are both 0-40 degrees.
4. The hydrogen premixing low-nitrogen burner based on-duty flame as claimed in claim 1, wherein the tail part of the main combustion nozzle is in a wide mouth shape, the junction of the main combustion nozzle and the venturi mixing section (4) in the middle part is a throat with a reduced inner diameter, a plurality of fuel spray holes (5) are uniformly arranged at the side wall of the throat, the spray direction is radial, the front part of the main combustion nozzle is a columnar space, and the quenching hole rectifying plate (3) and the low swirl vanes (2) are respectively arranged at the tail end and the front end of the columnar space.
5. The on-duty flame-based hydrogen premixing low-NOx burner as claimed in claim 1, wherein the quenching hole rectifying plate (3) is a flat plate with a through hole, and the size of the through hole aperture is the quenching size of the combustion.
6. The on-duty flame based hydrogen premixing low-nitrogen burner of claim 1, wherein the low swirl vanes (2) are a set of vanes rotated 0-40 ° clockwise or counterclockwise.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010910660.9A CN112066371B (en) | 2020-09-02 | 2020-09-02 | Hydrogen mixes low NOx burner in advance based on flame on duty |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010910660.9A CN112066371B (en) | 2020-09-02 | 2020-09-02 | Hydrogen mixes low NOx burner in advance based on flame on duty |
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| CN112066371A CN112066371A (en) | 2020-12-11 |
| CN112066371B true CN112066371B (en) | 2021-06-22 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2603779A (en) * | 2021-02-12 | 2022-08-17 | Bosch Thermotechnology Ltd Uk | Fuel supply device and method for operating such a fuel supply device |
| CN113483324B (en) * | 2021-07-16 | 2022-12-20 | 中国科学院上海高等研究院 | Tail gas burner |
| CN113883517B (en) * | 2021-10-12 | 2024-01-26 | 青岛科技大学 | Natural air inlet type low-nitrogen combustor |
| CN114542977A (en) * | 2022-02-28 | 2022-05-27 | 清华大学 | Natural gas hydrogen-mixing device |
| CN115751305B (en) * | 2022-10-28 | 2023-05-26 | 北京工商大学 | Low-nitrogen burner |
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| CN1884910A (en) * | 2005-06-24 | 2006-12-27 | 株式会社日立制作所 | Burner, gas turbine combustor, burner cooling method, and burner modifying method |
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