CN218348696U - Fuel nozzle - Google Patents
Fuel nozzle Download PDFInfo
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- CN218348696U CN218348696U CN202222190408.2U CN202222190408U CN218348696U CN 218348696 U CN218348696 U CN 218348696U CN 202222190408 U CN202222190408 U CN 202222190408U CN 218348696 U CN218348696 U CN 218348696U
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- fuel
- pipe
- fuel pipe
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- nozzle
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Abstract
The utility model discloses a fuel nozzle, which comprises an atomizing air shell, an inner layer fuel pipe, an outer layer fuel pipe and a sleeve retainer; the outer layer pipe fuel pipe is sleeved in the atomizing air shell; the lower end of the atomizing air shell is provided with a fuel nozzle, and the upper end of the atomizing air shell is sealed with the outer layer pipe fuel pipe; an air inlet is formed at the upper part of the atomizing air shell; an air flow channel is formed between the outer layer pipe fuel pipe and the atomization air shell from the air inlet to the fuel nozzle; the inner layer fuel pipe is coaxially sleeved in the outer layer fuel pipe; a heat insulation interlayer is formed between the inner layer fuel pipe and the outer layer fuel pipe, and a sleeve retainer is arranged in the heat insulation interlayer; the lower end of the inner fuel pipe is communicated with the fuel nozzle. The utility model discloses a fuel nozzle can guarantee that the oil circuit does not overtemperature and supplementary atomizing air still is the hot-air of high temperature, promotes fuel liquid fog evaporation effect, is convenient for make moreover, and is with low costs.
Description
Technical Field
The utility model relates to a gas turbine technical field, in particular to fuel nozzle.
Background
Fuel nozzles are commonly used to deliver fuel in a desired form into a combustion-supporting gas stream (e.g., air). When the temperature of the combustion-supporting airflow is higher, the evaporation and mixing of liquid fuel are facilitated, and the mixing of gas fuel is also facilitated, so that pollutants of combustion products are reduced; meanwhile, when the combustion outlet temperature is required to be a fixed value, the higher temperature of the combustion-supporting airflow inlet can reduce the target temperature rise of combustion, so that the fuel consumption is saved, and the energy-saving effect is achieved.
Careful heat exchange calculation is required in the design process of the fuel nozzle, and the temperature rise of the fuel before fuel delivery and combustion is controlled cannot reach the coking temperature. The existing aircraft engine mainly uses kerosene, the coking temperature of the kerosene exceeds three hundred ℃, so the anti-coking is relatively simple, but in the gas turbine using low coking temperature fuel oil such as diesel oil, and the like, in order to reduce the risk of coking and blockage, most of the gas turbines including foreign units all use a plane hole diffusion combustion scheme, and resist the influence of possible coking carbon particles by using a larger hole diameter, but the pollutant content of combustion products of the diffusion combustion nozzle is higher, and the NOx content is usually more than 250 ppm. The low-pollution diesel oil combustion nozzle needs to use a swirl design with smaller pore diameter, so that the mixing is increased to reduce pollution, but needs a more careful heat exchange design to control the temperature rise of fuel oil.
The temperature rise of fuel oil is mainly brought by the wall heat exchange of combustion-supporting high-temperature gas, in a gas turbine, the temperature of the combustion-supporting high-temperature gas is usually over 300 ℃, the initial temperature of the fuel oil is usually normal temperature, the initial temperature of the gas fuel oil is usually over 10 ℃ higher than the dew point temperature, at present, in order to control the fuel oil not to be coked, the length of a fuel pipeline embedded in a nozzle is usually shortened as much as possible in the common design, or an integral shell is designed outside the whole nozzle to isolate the influence of hot gas, if air auxiliary atomization is needed, exogenous air is used, or the air is cooled and then injected into the nozzle, but the atomization effect of the cooled auxiliary atomized air is not as good as the high-temperature atomized air effect.
A typical nozzle configuration with secondary atomizing air is shown in fig. 1, wherein atomizing air enters the secondary atomizing air housing 2 from an air inlet 1, and a fuel nozzle/atomizer 3 is connected to the secondary atomizing air housing 2 by a fuel tube 4. In order to reduce the pollution of emissions, the atomizing air is usually hot air with higher temperature, and since the fuel oil continuously exchanges heat with the atomizing air flowing between the fuel pipe 4 and the atomizing air shell 2 through the pipe wall of the fuel pipe 4, the closer to the fuel nozzle/atomizer 3, the higher the fuel oil temperature is, in the gas turbine, the atomizing air usually exceeds 300 ℃, as shown in fig. 2, the fuel oil is easy to coke and deposit on the inner wall of the fuel pipe 4 to form carbon deposits 6, and the fuel oil temperature reaches the highest point before evaporation in the fuel nozzle/atomizer 3, so the carbon deposits 6 in the precise fuel nozzle/atomizer 3 are the most, and the blockage is very easy, and the consequence is serious.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a fuel nozzle, can guarantee that the oil circuit does not overtemperature and supplementary atomizing air still is high temperature hot-air, promotes fuel liquid fog evaporation effect, the preparation of being convenient for moreover, and is with low costs.
In order to solve the above technical problem, the fuel nozzle provided by the present invention comprises an atomizing air housing 2, an inner layer fuel pipe 41, an outer layer fuel pipe 42 and a sleeve holder 40;
the outer layer pipe fuel pipe 42 is sleeved in the atomizing air shell 2;
a fuel nozzle is formed at the lower end of the atomizing air shell 2, and the upper end of the atomizing air shell is sealed with the outer layer pipe fuel pipe 42;
an air inlet 1 is formed at the upper part of the atomizing air shell 2;
an air flow passage is formed between the outer layer pipe fuel pipe 42 and the atomizing air shell 2 from the air inlet 1 to the fuel nozzle;
the inner layer fuel pipe 41 is coaxially sleeved in the outer layer fuel pipe 42;
a heat insulation interlayer is formed between the inner layer fuel pipe 41 and the outer layer fuel pipe 42, and a sleeve retainer 40 is arranged in the heat insulation interlayer;
the lower end of the inner fuel pipe 41 is communicated with the fuel nozzle.
Preferably, the sleeve holder 40 comprises an upper collar 401 and a lower collar 402;
the upper lantern ring 401 is sleeved between the upper end of the inner layer fuel pipe 41 and the upper end of the outer layer fuel pipe 42;
the lower collar 402 is fitted between the lower end of the inner pipe 41 and the lower end of the outer pipe 42.
Preferably, the upper collar 401 is coaxially and integrally formed with the upper pipe connector 403, and the lower end of the upper pipe connector 403 is communicated with the upper end of the inner fuel pipe 41;
the lower collar 402 is formed coaxially and integrally with the lower pipe joint 404, and the upper end of the lower pipe joint 404 communicates with the lower end of the inner fuel pipe 41.
Preferably, the heat insulation interlayer around the casing holder 40 is filled with a heat insulation filler 43.
Preferably, the thermal insulation filler 43 is aerogel or asbestos.
Preferably, the casing holder 40 is made of a heat insulating material.
Preferably, an atomizer 3 is arranged in the fuel nozzle;
the lower end of the inner layer fuel pipe 41 is communicated with an oil inlet of the atomizer 3;
the outer tube fuel pipe 42 and the air flow path between the atomizer 3 and the atomizing air casing 2 are formed.
Preferably, the outer tube fuel tube 42 is formed by rolling or winding a sheet material.
Preferably, the ferrule holder 40 is connected to at least one of the inner layer fuel pipe 41 and the outer layer fuel pipe 42 by welding, riveting or overlapping.
The utility model discloses a fuel nozzle, the coaxial cover of inlayer fuel pipe 41 is established in outer pipe fuel pipe 42, forms thermal-insulated intermediate layer between inlayer fuel pipe 41 and the outer pipe fuel pipe 42, is provided with sleeve pipe holder 40 in the thermal-insulated intermediate layer, forms the fuel pipe of a jacket structure. The fuel nozzle adopts the fuel pipe with the jacket structure, so that the oil way can be ensured not to be over-heated on the nozzle for air-assisted atomization, and the assisted atomization air is still high-temperature hot air, thereby greatly improving the evaporation effect of fuel liquid mist; moreover, the pipe of the fuel pipe with the jacket structure can be directly selected from standard pipes, so that the fuel nozzle is easy to form and low in cost, and is convenient to manufacture.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required for the present invention are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a cross-sectional view of a typical prior art nozzle configuration with auxiliary atomizing air;
FIG. 2 is a schematic diagram of coking and carbon deposition in a typical nozzle structure with auxiliary atomizing air;
FIG. 3 is a schematic cross-sectional view of an embodiment of the fuel injector of the present invention;
FIG. 4 is a schematic cross-sectional view of a fuel injector according to an embodiment of the present invention;
fig. 5 is a schematic view of a pipe joint connecting to a fuel pipe according to an embodiment of the present invention.
Description of the reference numerals:
1 an air inlet; 2 atomizing the air shell; 3, an atomizer; 4 a fuel line; 41 inner fuel pipe; 42 outer tube fuel tubes; 43 an insulating filler; 40 casing tube holder; 401 an upper collar; 402 a lower collar; 403 pipe joints are arranged; 404 a lower pipe joint; 6 carbon deposition.
Detailed Description
The technical solutions of the present invention will be described in detail and fully hereinafter with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Example one
As shown in fig. 3 and 4, the fuel nozzle includes an atomizing air casing 2, a fuel nozzle, an inner layer fuel pipe 41, an outer layer fuel pipe 42, and a sleeve holder 40;
the outer layer pipe fuel pipe 42 is sleeved in the atomizing air shell 2;
a fuel nozzle is formed at the lower end of the atomizing air shell 2, and the upper end of the atomizing air shell is sealed with the outer layer pipe fuel pipe 42;
an air inlet 1 is formed at the upper part of the atomizing air shell 2;
an air flow passage is formed between the outer layer pipe fuel pipe 42 and the atomizing air casing 2 from the air inlet 1 to the fuel nozzle;
the inner layer fuel pipe 41 is coaxially sleeved in the outer layer fuel pipe 42;
a heat insulation interlayer is formed between the inner layer fuel pipe 41 and the outer layer fuel pipe 42, and a sleeve retainer 40 is arranged in the heat insulation interlayer;
the lower end of the inner fuel pipe 41 is communicated with the fuel nozzle.
In the fuel nozzle according to the first embodiment, the inner fuel pipe 41 is coaxially sleeved in the outer fuel pipe 42, a heat insulating interlayer is formed between the inner fuel pipe 41 and the outer fuel pipe 42, and the sleeve holder 40 is disposed in the heat insulating interlayer, so that the fuel pipe with a jacket structure is formed. According to the fuel nozzle, due to the adoption of the fuel pipe with the jacket structure, the condition that an oil way is not over-heated and auxiliary atomized air is still high-temperature hot air can be ensured on the air auxiliary atomized nozzle, so that the evaporation effect of fuel liquid fog is greatly improved; moreover, the pipe of the fuel pipe with the jacket structure can be directly selected from standard pipes, so that the fuel nozzle is easy to form and low in cost, and is convenient to manufacture. The inner layer fuel pipe 41 and the outer layer fuel pipe 42 may be straight pipes, bent pipes, or pipes of any shape, and may be formed by fitting and then bending pipes, or may be formed by filling heat insulating filler and then bending pipes, or by other molding operations, so that the inner layer fuel pipe 41 and the outer layer fuel pipe 42 are coaxial and do not directly contact with each other. The fuel nozzle is suitable for nozzle designs of any principle, has no requirements on the appearance of the nozzle, the insertion depth of the nozzle in a gas turbine and an atomized gas source, has strong adaptability,
example two
According to the fuel nozzle of the first embodiment, as shown in fig. 4 and 5, the sleeve holder 40 includes an upper collar 401 and a lower collar 402;
the upper lantern ring 401 is sleeved between the upper end of the inner layer fuel pipe 41 and the upper end of the outer layer fuel pipe 42;
the lower collar 402 is fitted between the lower end of the inner pipe 41 and the lower end of the outer pipe 42.
Preferably, the upper collar 401 is coaxially and integrally formed with the upper pipe connector 403, and the lower end of the upper pipe connector 403 is communicated with the upper end of the inner fuel pipe 41;
the lower collar 402 is formed coaxially and integrally with the lower pipe joint 404, and the upper end of the lower pipe joint 404 communicates with the lower end of the inner fuel pipe 41 and projects into the fuel injection port.
EXAMPLE III
Based on the fuel nozzle of the first embodiment, the heat insulation interlayer around the sleeve holder 40 is filled with the heat insulation filler 43.
Preferably, the thermal insulation filler 43 is aerogel or asbestos.
Preferably, the casing holder 40 is made of a heat insulating material.
Example four
Based on the fuel nozzle of the first embodiment, an atomizer 3 is arranged in the fuel nozzle;
the lower end of the inner layer fuel pipe 41 is communicated with an oil inlet of the atomizer 3;
the outer tube fuel pipe 42 and the air flow path between the atomizer 3 and the atomizing air casing 2 are formed.
EXAMPLE five
Based on the fuel nozzle of the first embodiment, the outer pipe fuel pipe 42 may be formed by rolling or winding a sheet material so long as air is kept in a space from the inner pipe fuel pipe 41.
Preferably, the ferrule holder 40 is connected to at least one of the inner layer fuel pipe 41 and the outer layer fuel pipe 42 by welding, riveting, or bonding. The joints of the ferrule holder 40 with the inner layer fuel pipe 41 and the outer layer fuel pipe 42 need not be completely sealed.
The above description is only for the preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements and the like made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A fuel nozzle, characterized in that it comprises an atomizing air housing (2), an inner layer fuel pipe (41), an outer layer fuel pipe (42) and a sleeve holder (40);
the outer layer pipe fuel pipe (42) is sleeved in the atomizing air shell (2);
a fuel nozzle is formed at the lower end of the atomization air shell (2), and the upper end of the atomization air shell is sealed with the outer layer pipe fuel pipe (42);
an air inlet (1) is formed at the upper part of the atomizing air shell (2);
an air flow channel is formed between the outer layer pipe fuel pipe (42) and the atomizing air shell (2) from the air inlet (1) to the fuel nozzle;
the inner layer fuel pipe (41) is coaxially sleeved in the outer layer fuel pipe (42);
a heat insulation interlayer is formed between the inner layer fuel pipe (41) and the outer layer fuel pipe (42), and a sleeve retainer (40) is arranged in the heat insulation interlayer;
the lower end of the inner fuel pipe (41) is communicated with the fuel nozzle.
2. The fuel injector of claim 1,
the sleeve retainer (40) comprises an upper sleeve ring (401) and a lower sleeve ring (402);
the upper lantern ring (401) is sleeved between the upper end of the inner layer fuel pipe (41) and the upper end of the outer layer fuel pipe (42);
the lower lantern ring (402) is sleeved between the lower end of the inner layer fuel pipe (41) and the lower end of the outer layer fuel pipe (42).
3. The fuel injector of claim 1,
the upper sleeve ring (401) and the upper pipe joint (403) are coaxially and integrally formed, and the lower end of the upper pipe joint (403) is communicated with the upper end of the inner layer fuel pipe (41);
the lower lantern ring (402) and the lower pipe joint (404) are coaxially and integrally formed, and the upper end of the lower pipe joint (404) is communicated with the lower end of the inner layer fuel pipe (41).
4. The fuel injector of claim 1,
and a heat insulation filler (43) is filled in the heat insulation interlayer around the sleeve retainer (40).
5. The fuel injector of claim 4,
the heat insulation filler (43) is aerogel or asbestos.
6. The fuel injector of claim 1,
the sleeve retainer (40) is made of heat insulation materials.
7. The fuel injector of claim 1,
an atomizer (3) is arranged in the fuel nozzle;
the lower end of the inner layer fuel pipe (41) is communicated with an oil inlet of the atomizer (3);
an air flow passage is formed between the outer pipe fuel pipe (42) and the atomizer (3) and the atomizing air shell (2).
8. The fuel injector of claim 1,
the outer layer pipe fuel pipe (42) is formed by rolling or winding a plate material.
9. The fuel injector of claim 1,
the sleeve retainer (40) is connected with at least one of the inner layer fuel pipe (41) and the outer layer fuel pipe (42) in a welding, riveting or overlapping mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222190408.2U CN218348696U (en) | 2022-08-19 | 2022-08-19 | Fuel nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222190408.2U CN218348696U (en) | 2022-08-19 | 2022-08-19 | Fuel nozzle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218348696U true CN218348696U (en) | 2023-01-20 |
Family
ID=84915392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222190408.2U Active CN218348696U (en) | 2022-08-19 | 2022-08-19 | Fuel nozzle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218348696U (en) |
-
2022
- 2022-08-19 CN CN202222190408.2U patent/CN218348696U/en active Active
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